Jeffery Hunter Young, M.D., M.H.S.

• Associate Professor of Medicine

https://www.hopkinsmedicine.org/profiles/results/directory/profile/0007602/jeffery-young

There are several commercial systems which offer such functionality as complete room service package birth control for women in forties purchase levlen uk. Other optional features such as writing surfaces and dictation facilities depend on the report generation management (see documentation) birth control without hormones generic 0.15 mg levlen free shipping. The monitor display should be positioned in such way that it can be easily viewed and controlled birth control pills planned parenthood discount levlen 0.15 mg mastercard. The positioning of the monitor should also consider that cables and lines connect to the patients birth control pills 2016 buy cheap levlen 0.15 mg, and these should not cross the working areas of the endoscopist birth control pills packaged wrong levlen 0.15 mg order fast delivery. As in most operating rooms, documentation of the vital parameters (respiratory rate, heart rate, blood pressure, medication administration) is increasingly carried out via digital online recording of the respective parameters. In some units, it has been found convenient to place markers on the floor so that mobile equipment is placed correctly. As general anesthesia has changed mostly to intravenous agents, the installation requirements for general anesthesia have decreased. However, the needs of the anesthesiologist should be considered during the primary planning. In addition to the equipment within the procedure room, a mobile endoscopy trolley carrying all essential instruments and endoscopic processors should always be on standby, as occasionally an endoscopic procedure has to be carried out in other parts of the hospital, such as the intensive care unit or the surgical or radiological department. Whether videos are stored centrally or in the local endoscopic documentation system depends on the video concept of the unit or the hospital. This offers the advantage that all images are stored with the respective patient case in a central system which is generally accessible. In the radiographic procedure room, this documentation area must be located outside the radiation area. Various commercial endoscopic documentation systems with integrated report generation are available. As endoscopic terminology has been widely standardized, reports can be generated with these systems. For the integration of additional equipment, additional video inputs and video lines have to be planned and installed. In most larger units, it is advisable to centralize video information to a central video switchboard which allows central video streaming or storage. Recently, there have been attempts to switch the documentation process to handheld devices, which will then decrease space requirements. Since such procedures tend to be time consuming, they should be scheduled and planned carefully so as to not interfere with general routine endoscopic activities. Such facilities avoid the inconvenience and waste of time involved in transporting patients and fragile equipment to and from the radiology department. An alternative for smaller endoscopy units is to modify one of the rooms in the radiography department to accommodate endoscopy. The choice of radiography system should consider the special needs of the endoscopist. Digital X-ray with a pulse radiographic beam is preferable due to high image quality and low radiation exposure. This technology involves magnetic field tracking, and prerequisites for such procedures can be planned in new procedure rooms. The radiographic procedure room is often used with additional imaging modalities such as endosonography and cholangiography. The number of endoscopes needed is dependent on the reprocessing cycles, the number of procedures and rooms active in parallel, and the amount of specialized procedures that require specialized endoscopes and equipment. A "2 and 2" or "3 and 2" monitor system is recommended with flexible inputs to the various monitors, for example, by the use of a special switching device. The radiography monitor and the videoendoscopic monitor should be mounted together and positioned in such a way that the endoscopist and assistant personnel have a direct, unobstructed view. The second monitor system for the assistant personnel should be composed of one X-ray and one endoscopic monitor. The radiographic room should have enough space for the X-ray protection and shielding system and should be especially equipped for procedures performed under general anesthesia. There should be enough room for brushing, ultrasonic cleaner, tightness control, and a compressed-air system for mechanical cleaning. After cleaning and disinfection of the endoscopes, they should be stored either hanging in a closed storage cabinet or in specially designed venting cabinets. This allows generation of an endoscope "history" where all relevant data from the endoscope are collected in a central data file. These data include time and use of the endoscopes in the individual patients, time and responsible person who cleaned and processed the endoscope, processing protocol, time and success of the disinfection process, and time during transfer of the endoscope to the venting cabinet. With this log file, continuous monitoring of the endoscope use as well as cleaning and processing can be established. These data can be used to define interval for service and evaluation of endoscopes, hygiene controls, and mandatory service procedures. The capacity of the disinfection equipment and washing machines needed for a given unit depends on the number of examinations, the time planned per examination, and the time needed to clean, disinfect, and dry (cleaning cycle) the endoscope. As vapors from disinfectants need to be removed from the room, a powerful ventilation system has to be in place for the cleaning and processing area to exclude the possibility of inhalation of toxic or allergenic vapors. The use of sedatives such as midazolam and/or propofol during upper or lower tract endoscopy requires recovery facilities (with nursing supervision), since it may be as long as an hour before these patients are able to leave the endoscopy unit. Oxygen and suction devices are essential in addition to pulse oximeters, electrocardiography monitoring, and resuscitation equipment. Thus, the concepts for cleaning and reprocessing the endoscopes is of utmost importance and should be handled with local disinfection experts. Processing of the endoscopes can be done in a centralized area for the entire hospital, but requires elaborate logistics for transport to and from the unit. More commonly, a disinfection and reprocessing area is located within the endoscopic unit. In larger units with more than three procedure rooms, the cleaning area is best located centrally. For optimal hygiene, a one-way system for endoscope transport and processing has to be established. The cleaning and reprocessing area has to be divided into separate unclean and clean areas. These two areas should be completely separated by a separating wall and best by double side or load through washing and reprocessing machines, which act as separator for the two rooms. Cleaning of endoscopes should be carried out by fully-automated washing and disinfection machines by skilled personal. The unclean areas should contain stainless-steel work surfaces, with a double sink and an ultrasonic bath for initial cleaning. One head nurse should be in charge of the unit for the day, and at least one other handling the recovery area. Lower level staff can be trained to perform cleaning and disinfection effectively, and to assist with recovery duties. However, the procedure-related nurses should maintain their skills in handling those functions and may occasionally rotate through these areas. This also ensures a more consistent approach to cleaning and disinfection of endoscopic equipment for patient safety. The extent to which the nurse manager is involved in actual procedures will depend on the size of the unit. In a department with four or five procedure rooms, the nurse manager should allocate at least half of his or her time for office and managerial activities. The amount of secretarial assistance will Design of the Endoscopy Suite depend on the methods used for scheduling and reporting. An appropriate technician must be available if radiography equipment is in use-not only to assist with the procedures, but also to help in maintaining and monitoring radiation safety standards. Dordrecht: Kluwer Academic; 1997:345­53 Riphaus A, Wehrmann T, Weber B, et al; Sektion Enoskopie im Auftrag der Deutschen Gesellschaft für Verdauungs- und Stoffwechselerkrankungen. Provision of gastrointestinal endoscopy and related services for a district general hospital. Provision of Gastrointestinal Endoscopy and Related Services for a District General Hospital: Report of the British Society of Gastroenterology. Guidelines for designing an endoscopy unit: report of the Dutch Society of Gastroenterologists. The soiled environment in which endoscopes are used yields a significant bioburden for cleaning and eradication before their reuse in subsequent patients. The complexity of endoscope design further challenges the task of producing a microbe-free instrument. Our recognition of reprocessing requirements and adoption of standardized approaches to reprocessing developed slowly over several decades. This level of reprocessing eradicates all living bacteria, viruses, and most spores, unless present in high numbers. Recurring clusters of infections, primarily related to lapses in standard reprocessing steps, have repeatedly focused the attention of the medical community and the broader regulatory and patient communities on the issue of reprocessing. This has culminated in the development of multiple national and international standards and guidelines for reprocessing, from many affiliated medical and technical specialty groups. Despite differences in detail and specificity, most existing guidelines are highly uniform in their requirements. It should enable successful subsequent disinfection or sterilization and prevent accumulation of residual soil throughout the useful life of the product. Individual agents are sometimes referred to as germicides, fungicides, sporicides, etc. In contrast, antiseptics are agents that reduce or eliminate microorganisms on skin or in living tissues. Sterilization achieves 100% eradication of all forms of life or infectious agents. This degree of certainty cannot be measured or accurately achieved; hence, sterility is often equated to a very low probability of less than 10­6 (< 1/106 = less than one in a million) of a nonsterile unit following sterilization. The intensity of reprocessing for all medical devices is based on the Spaulding classification, which stipulates that the degree of disinfection or sterilization should be based on the risk of transmission, as related to the nature of contact with the patient (Table 6. Reprocessing refers to a validated process that is used to render a used or soiled medical device fit for a subsequent single use. Endoscopes or devices that are used in sterile environments, such as percutaneous laparoscopic passage and insertion via an enterotomy during a laparotomy, are deemed to require sterilization. Devices breaking the mucosal surface, such as needles and biopsy cables, and those entering sterile systems such as the biliary tree or pancreatic ducts, must be sterilized between uses. Many busy endoscopy departments opt for use of sterile single-use accessories such as biopsy cables, Cleaning and Disinfection in Endoscopy Table 6. The most uniformly adopted approach to reprocessing of endoscopes employs several standardized steps (Table 6. Bedside precleaning (or "point-of-use processing") using water and detergent to wipe the endoscope exterior and flushing or aspirating it through the air and water channels to remove grossly visible blood and soil before they have an opportunity to dry and more tightly adhere to the instrument. After this gross cleaning, disassembly of all valves and parts is performed, followed by leak testing. Manual mechanical cleaning, distant from the bedside, with full submersion in water and detergent while physically wiping all exterior surfaces and brushing the accessible inner channels. This requires flushing and aspiration of large volumes of water and detergent followed by a thorough rinse. Detergents facilitate disaggregation and removal of debris but are not efficient microbicides. Forced air drying to ensure complete removal of moisture from the endoscope channels. Straight upright storage theoretically facilitates drainage of any potentially retained liquids. Varieties of specialty cabinets with filtered or heated air flow, and some with flat storage, are marketed for this purpose. Adequate reprocessing of gastrointestinal endoscopes, however, is hampered by several specific challenges, including: (1) the immense bioburden they acquire during use, (2) the relatively narrow margin of safety achieved when all reprocessing steps are appropriately performed, (3) the risk for development of intractable biofilm when cleaning steps are insufficiently performed, (4) the lack of rapid and accurate bioindicators of the process end points, (5) training, support, and ongoing supervision for staff who performs the repetitive tasks, and (6) the need for efficient turnaround of instruments in busy clinical environments. Reliable, inexpensive, rapid biomarkers to assess adequacy of reprocessing by assaying for residual contamination would clearly improve performance and cleaning outcomes. A variety of indicators for residual blood, protein, and other components of living tissue have been evaluated, but none appear reliable for assessment of the fully reprocessed instrument. Others, including many widely employed today, serve as disinfectants but do not have regulatory clearance as sterilizing agents. They enhance consistency in many parameters of reprocessing cycles (time, volume, temperature, pressure, concentration, etc. Undoubtedly, publication and other public reporting mechanisms significantly underrepresent the likely occurrences of disease transmission during endoscopy. The risk appears to be related to the challenge of cleaning and disinfection in tight crevices surrounding the elevator mechanism and its actuation cable. Limited case reports and culture studies suggest similar risk of persistent contamination after reprocessing of echoendoscopes. Steps include investigating the risk to patients, communicating with appropriate local and regulatory groups, and potentially undertaking a notification and call-back program for exposed patients. In the current era, most guidance advises informing patients and serologic or culture testing are selectively based on the perceived risk. Breaches in reprocessing are not uncommon; however, transmission of an infectious agent is far less so, due to variations in prevalence and infectivity 6. Guidance for industry: sterile drug products produced by aseptic processing- current good manufacturing practice. High-level endoscope disinfection processes in emerging economies: financial impact of manual process versus automated endoscope reprocessing. Worst-case soiling levels for patient-used flexible endoscopes before and after cleaning. Natural bioburden levels detected on flexible gastrointestinal endoscopes after clinical use and manual cleaning.

It consists of a catalytic subunit birth control pills low dose best buy for levlen, a chaperone -subunit birth control bloating order levlen 0.15 mg line, and a third nonobligatory -subunit birth control pills cycle purchase 0.15 mg levlen with amex. Thiazides reduce calcium excretion acutely and chronically; in contrast birth control pills quarterly buy 0.15 mg levlen amex, thiazides increase urinary magnesium loss birth control pills 91 day purchase cheap levlen line, and this effect is largely only with sustained therapy. Another factor might be a potential inhibitory effect of aldosterone on magnesium reabsorption. Interestingly, cardinal features, such as hypocalciuria and hypomagnesemia, might change during the life cycle of a given patient, reflecting dietary changes or compensatory mechanisms. Similarly, treatment of hypomagnesemia to achieve near normal serum magnesium and prevent tetany often requires oral magnesium supplements, generally magnesium oxide or magnesium chloride, at doses that can induce diarrhea and at dosing intervals that make compliance difficult. In addition, Kcnj10 knockout mice have dysmyelination of the spinal cord and brainstem; the knockout mice are growth retarded compared to heterozygous littermates, demonstrate lower extremity weakness and ataxia, and expire in the days after birth in the context of seizures and these central nervous system dysfunctions. All have demonstrated generalized seizures in the first 6 months of life and all have shown delay in development of speech and motor functions. Similar to the knockout mice, motor strength was especially marked in the lower extremities. Though the metabolic abnormalities do not generally produce dramatic symptoms, the findings are diagnostically important. Urinary magnesium excretion is not diminished despite the hypomagnesemia, indicating an abnormality in renal magnesium handling. However, unlike most other disorders of renal magnesium homeostasis, the finding is isolated; affected individuals demonstrate normal urine and serum calcium and normal serum potassium. All 32 hypomagnesemic family members were on the same maternal lineage, and none of the hypomagnesemic men transmitted it to their offspring. These differences from those family members in the nonmaternal lineage were significant even though many were on treatment. These findings suggested mitochondrial inheritance, and this was supported by a genome-wide linkage study that showed no evidence of linkage to any region of the nuclear genome. Direct sequencing of the entire mitochondrial genome in this family revealed 14 sequence variants, 13 of which were known polymorphisms. This mutation had not been reported in the thousands of sequences recorded until then in the Human Mitochondrial Genome Database, was absent among 170 control individuals, and was not found in any of the family members in the nonmaternal lineage. The prevalence of other phenotypes associated with mitochondrial dysfunction, including migraine headaches, sensorineural hearing loss, and hypertrophic cardiomyopathy, was also increased on the maternal lineage in this family. Other evidence has implicated mitochondrial dysfunction with insulin resistance, obesity, and 10. The disorder is inherited in an autosomal dominant manner and mutations are heterozygous. The different phenotype for these two disorders may be explained by a difference in the composition of Kv1. But the clustering of hypertension and hypercholesterolemia with this mitochondrial mutation, and the known decline in mitochondrial function with age, suggest a role for mitochondria in the metabolic syndrome. Pearson syndrome is a multiorgan disorder characterized by exocrine pancreatic dysfunction and vacuolization of marrow hematopoetic precursor cells with sideroblastic anemia, often with diabetes, organic aciduria, and features of the renal Fanconi syndrome. When reported hypomagnesemia has been associated with severe renal magnesium wasting. The acronym represents the features of hyperuricemia, pulmonary hypertension, renal failure, and alkalosis. It was described in three infants from one Palestinian village including two in consanguineous kindred. All three had significant hypomagnesemia with inappropriate renal wasting, and all died in the first months of life. The gene was identified as a candidate because it was among those found to be differentially expressed in Cldn16-deficient mice. It was of interest because it had previously been shown to be upregulated in magnesium deficiency and to mediate the transport of magnesium and a number of other divalent cations but not calcium. These mutations segregated with the disease and were not present in 200 ethnically matched control chromosomes. The two patients with homozygous mutations presented in the first days of life and had structural brain malformations and much more severe symptoms than the remainder, who were heterozygous and presented after months or years. In general, patients with symptoms that can be related to hypomagnesemia, such as tetany, tremor or seizures should receive magnesium supplements. However, given the underlying nature of these diseases, achieving a serum magnesium concentration within the normal range is usually difficult. Because urinary magnesium wasting is ongoing, and supplementation at high or even moderate oral doses carries the risk of diarrhea, optimal therapy requires dosing magnesium supplements multiple times per day, which can make compliance difficult. In fact, asymptomatic mild hypomagnesemia is relatively common in the general population; it is estimated to occur in 2. Induction of hypomagnesemia in individuals without diabetes reduces insulin sensitivity138 and an inverse relationship between serum magnesium concentrations and glycemic control in patients with type 2 diabetes has been reported. Angiotensin-converting enzyme inhibitors or angiotensin-receptor blockers may reduce glomerular filtration rate and magnesium delivery to the distal nephron. Otherwise, magnesium supplements, generally magnesium chloride, or oxide, at the greatest doses and dosing intervals that can be tolerated, remain the mainstay of therapy. If a clinical diagnosis of a specific inherited renal magnesium-wasting disorder has been made the patient and family should be counseled as to the apparent inheritance pattern and the likelihood of future affected offspring. Depending upon the certainty of the diagnosis and family considerations, diagnostic testing, including prenatal diagnosis, may be pursued. Maternal hypomagnesemia causes placental abnormalities and fetal and postnatal mortality. Studies in primary hypomagnesaemia: evidence for defective carrier-mediated small intestinal transport of magnesium. Paracellin-1, a renal tight junction protein required for paracellular Mg2+ resorption. Decreased bicarbonate threshold and renal magnesium wasting in a sibship with distal renal tubular acidosis. Novel paracellin-1 mutations in 25 families with familial hypomagnesemia with hypercalciuria and nephrocalcinosis. The role of tight junctions in paracellular ion transport in the renal tubule: lessons learned from a rare inherited tubular disorder. Claudin-16 deficiency impairs tight junction function in ameloblasts, leading to abnormal enamel formation. A single gene product, claudin-1 or -2, reconstitutes tight junction strands and recruits occludin in fibroblasts. Claudin-16 and claudin-19 interact and form a cationselective tight junction complex. Biochemical and biophysical analyses of tight junction permeability made of claudin-16 and claudin-19 dimerization. Frequency of rare allelic variation in candidate genes among individuals with low and high urinary calcium excretion. Claudin-16 and claudin-19 interaction is required for their assembly into tight junctions and for renal reabsorption of magnesium. Targeted deletion of murine Cldn16 identifies extra- and intrarenal compensatory mechanisms of Ca2+ and Mg2+ wasting. A deletion of the paracellin-1 gene is responsible for renal tubular dysplasia in cattle. Primary infantile hypomagnesaemia: outcome after 21 years and treatment with continuous nocturnal nasogastric magnesium infusion. Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits. Hypomagnesemia with secondary hypocalcemia in a female with balanced X;9 translocation: mapping of the Xp22 chromosome breakpoint. Familial hypomagnesemia maps to chromosome 9q, not to the X chromosome: genetic linkage mapping and analysis of a balanced translocation breakpoint. A novel homozygous mutation in the transient receptor potential melastatin 6 gene: a case report. The epithelial Mg2+ channel transient receptor potential melastatin 6 is regulated by dietary Mg2+ content and estrogens. Transient receptor potential melastatin 6 knockout mice are lethal whereas heterozygous deletion results in mild hypomagnesemia. Magnesium wasting associated with epidermal-growthfactor receptor-targeting antibodies in colorectal cancer: a prospective study. Use of calcium excretion values to distinguish two forms of primary renal tubular hypokalemic alkalosis: Bartter and Gitelman syndromes. Morphological and physiological responses to aldosterone: time course and sodium dependence. Intrafamilial phenotype variability in patients with Gitelman syndrome having the same mutations in their thiazide-sensitive sodium/chloride cotransporter. Subunit combinations defined for K+ channel Kv1 subtypes in synaptic membranes from bovine brain. Heteromeric Kv1 potassium channel expression: amino acid determinants involved in processing and trafficking to the cell surface. Concatemers of brain Kv1 channel alpha subunits that give similar K+ currents yield pharmacologically distinguishable heteromers. Belostotsky R, Ben-Shalom e, Rinat C, Beckes-Cohen R, Feinstein S, Zeligson S, et al. Genome-wide association studies of serum magnesium, potassium, and sodium concentrations identify six Loci- influencing serum magnesium levels. Prevalence of hypomagnesemia in an unselected German population of 16,000 individuals. Magnesium deficiency produces insulin resistance and increased thromboxane synthesis. Lower serum magnesium levels are associated with more rapid decline of renal function in patients with diabetes mellitus type 2. The most common metabolic abnormality in patients with kidney stones is hypercalciuria, which is a complex metabolic trait that is dependent on three major organs: the amount of dietary calcium absorbed, any net calcium released from bone resorption in excess of formation, and the extent to which filtered calcium is reabsorbed in the renal tubule. Whether a patient forms a kidney stone is dependent not only on the magnitude of the hypercalciuria but also on urinary volume, excretion of other ions, including oxalate, citrate, and phosphate, and on local factors in the urinary tract. Given the many determinants of not only urine calcium excretion, but also the other factors that determine whether a patient will form a kidney stone, it is clear that multiple genetic loci are involved. In this article, we will describe the progress made in understanding the genetic basis for hypercalciuria and stone formation in both experimental models and in man. While the kidney can render the urine virtually sodium free, there is a minimal obligatory amount of calcium excreted in urine over a given time. The conservation of water mandates a low urine volume, which imposes a herculean challenge to the kidney to keep calcium from forming insoluble complexes and precipitating. From this vantage point, the definition of hypercalciuria becomes not so straightforward. The practitioner uses highly pragmatic "cut-off" type of definitions such >250 mg (6. There are very few true dichotomous variables in biomedicine, perhaps life versus death and nongravid versus gravid being prime examples. Similar to many urinary electrolytes during zero external balance, the excretion rate of substances simply reflect the ingestion rates and as such, the "normal" rate of excretion of 819 820 43. In addition to calcium intake, there are other physiologic factors that determine the rate of excretion of calcium; the main ones being dietary sodium,10 which determines extracellular fluid volume, exogenous and endogenous acid production,11­13 and perhaps nonacid related components in protein. From the point of view of disease, one is basically considering the ability of calcium in imparting risk of kidney stones so hypercalciuria can be statistically defined as the level above which there is a significant escalation of probability of stone formation. The two major anions that forms insoluble complexes with calcium and consequently eventuate in the solid phase of the urolith are oxalate and phosphate. In contrary to the prourolithic anions oxalate and phosphate, citrate chelates calcium in a stable and soluble complex so a given level of uCa may or may not confer stone risk depending on the level of urinary citrate. As evident from the above description, the quantitative analysis of uCa excretion is far from simple. Aside from the construal of its magnitude, the origin of hypercalciuria is equally complex. From the physiologic knowledge of calcium homeostasis, one can deduce that genetic determinants will be distributed over many loci and thus propound at formidable challenge to those who attempt to unravel their identities and mode of action. This article will summarize the efforts devoted and successes secured thus far in this field. Yet, with the exception of a few rare monogenic causes, we have little idea, and even less so, proof, of any loci in human calcareous nephrolithiasis. The ability of large number of nongenetic factors yielding the same phenotype as some genetic determinants (phenocopy) is exceedingly common in hypercalciuric kidney stone formers. Affected individuals may inherit different sets of genes that predispose to hypercalciuria (loci heterogeneity) so collections of different causative and modifying genes may all lead to an identical phenotype. All these confounders in concert constitute a problem of nightmarish proportions for the investigator who strives to identify individual genetic loci for hypercalciuria. In addition, the clinical database often is limited to "kidney stones" as a phenotype with no reference to stone constituent and urinary biochemistry. The enormous heterogeneity of stones in the absence of intermediate phenotype further amplifies this problem to the nth degree. With that in the foreground, one questions if there is any hope of ever unraveling this mystery and translate it to clinical diagnostics and therapeutics A summary will be provided here but the reader is referred to an excellent recent review by Attanasio for a more detailed discussion. In a large epidemiologic study of more than 3 × 105 patient-years and adjusting for dietary factors, age, and body mass index, the authors found a 2.

Antibodies are proteins made by white blood cells to protect the body from infections birth control ovulation order 0.15 mg levlen with visa. Scar tissue is an attempt to contain areas of the liver that have been damaged by alcohol birth control for 9 cheap levlen american express, hepatitis C birth control for women 6ft levlen 0.15 mg purchase on-line, or other factors birth control pills reduce ovarian cancer risk levlen 0.15 mg purchase free shipping. A procedure in which the doctor looks inside the rectum and the lower portion of the colon (sigmoid colon) through a flexible birth control yaz side effects buy discount levlen 0.15 mg on-line, lighted tube called a sigmoidoscope. Continual straining to have a bowel movement causes 753 Gastrointestinal Diseases and Disorders Sourcebook, 4th Ed. Hirschsprung disease: A birth defect in which some nerve cells are lacking in the large intestine. The body makes too much hydrogen when lactose is not broken down properly in the small intestine. The surgeon makes an opening in the abdomen and attaches the bottom of the small intestine (ileum) to it. Jaundice causes the skin and eyes to turn yellow from too much bilirubin in the blood. The doctor inserts a laparoscope and other surgical instruments through small holes in the abdomen. The large intestine absorbs water from stool and changes it from a liquid to a solid form. The liver carries out many important functions, such as making bile, changing food into energy, and cleaning alcohol and poisons from the blood. The patient takes the oral medications chenodiol (Chenix) and ursodiol (Actigall). An ulcer in the stomach is a gastric ulcer; an ulcer in the duodenum is a duodenal ulcer. When a person has porphyria, cells fail to change chemicals (porphyrins) to the substance (heme) that gives blood its color. Long-term irritation of the liver may cause scarring and cirrhosis in later stages of the disease. A needle is inserted through an endoscope to bring hardening agents to the place that is bleeding. Recommended screening tests for colorectal cancer include the fecal occult blood test, flexible sigmoidoscopy, and colonoscopy. Causes the stomach to make pepsin, the liver to make bile, and the pancreas to make a digestive juice. Somatostatin helps tell the body when to make the hormones insulin, glucagon, gastrin, secretin, and renin. An example is the muscle between the esophagus and the stomach known as the lower esophageal sphincter. Too much copper builds up in the liver and is slowly released into other parts of the body. The overload can cause severe liver and brain damage if not treated with medication. The gastrin causes too much acid in the duodenum, resulting in ulcers, bleeding, and perforation. Specialist medical societies have produced guidelines and recommendations for minimum quality requirements for performance of endoscopic techniques (Table 1. Optimal methods, duration, and proper endpoints of training are still topics of debate. This article presents an overview of training issues and the role of simulators in training. Competency in one technique does not necessarily guarantee competency in another technique. The ability to reach the cecum is the most common criterion by which colonoscopies have been judged. Independent cecal intubation rates of 85% and cecal intubation times of 16 minutes or less were achieved at 275 procedures on average, which is more than previous gastroenterology training recommendations required. The average fellow reached required cognitive and motor skills endpoints by 250 procedures, with over 90% of fellows surpassing these thresholds by 300 procedures. Candidates had to prove experience in a minimum of 500 colonoscopies with a self-reported cecal intubation rate of 90% and a polyp detection rate of 20%. An individual web-based logbook and e-portfolio of each endoscopist is created via a national database system that is the base for credentialing and certification. Feedback of data to individuals helps in benchmarking and identification of those with suboptimal performance and a need for extra training and close audits. For example, it is well known that for routine stent exchanges in the setting of a prior sphincterotomy, fewer procedures (n = 60) are needed to obtain competence than is the case with cannulation of a native papilla (n = 180­200), and it is also known that stent exchanges are associated with a lower risk profile compared to cannulation. Patients with benign biliary strictures, chronic obstructive pancreatitis, and recurrent bile duct stones in the setting of prior sphincterotomy are also associated with lower risk during training. Absolute numbers of procedures partially performed by a fellow may not realistically reflect competence. For example, a high-cost computer simulator that had a 25% reduction in a learning curve might not make any sense for a program in which trainees typically had sufficient actual case experience to develop competency. In contrast, a lower cost simulator in which a program typically had insufficient cases would be well worth the investment. Christopher Williams and his group in London have been working on the first semi-rigid colonoscopy phantoms. Unfortunately, those models are not commercially available so far and there are no published data validating their use in training. In addition, a number of device manufacturers have produced their own models to facilitate training in the procedures in which their accessories are used. For an endoscopy simulator to be integrated into the standard instruction for a procedure, it must demonstrate a 25% or greater reduction in the median number of clinical cases required for the trainees to achieve the minimal competence parameters for that procedure. Simulator-based assessment tools must be procedure-specific and predictive of independently defined minimal competence parameters from real procedures with a kappa value of at least 0. One limitation of this and all static simulators to date is the limited exposure to pathology for training in image recognition and application of findings into management decisions. United States, formerly Simbionix Corporation), at the time in the shape of a human torso mannequin. Virtual sphincterotomy, stone extraction, and other techniques have been implemented. All devices allow user-specific training curricula and reflect the user-specific learning curve. Various studies have demonstrated the benefits of additional computer simulator training in connection with colonoscopy. The simulator-trained fellows outperformed the traditionally trained fellows during their initial 15 to 30 colonoscopies in all performance aspects except for insertion time (p < 0. Beyond 30 procedures, there were no differences in performance between the two groups (evidence level B). Computer Simulators Various computer simulation systems have been developed since the early 1980s. These studies suggest that virtual reality simulator training prior to real cases accelerates early training, but improvement in final competency has not yet been established. Nor has there been any computer-based skills test that has been correlated with competent performance on actual endoscopic procedures. Ethical considerations, animal welfare, and problems of hygiene, along with the need for dedicated endoscopes for animal use and substantial staff and financial expenditure, are major restrictions. Currently, training courses on live animals are performed for many different techniques including endoscopic submucosal dissection and peroral endoscopic myotomy. Bile duct stones can be simulated by inserting pieces of plastic stents into the bile duct. It is generally recommended to use special animal endoscopes for the training with isolated ("ex vivo") pig organs. In particular, the evaluation of clinical cases following the training period showed a higher initial hemostasis rate and a lower complication rate among simulator-trained fellows, although the difference in the complication rate was not significant. For this hand­eye dexterity test performed before the training course, four 2- to 3-mm dots are created on the anterior wall of the ex vivo porcine simulator using a thermal device. The dots are arranged in the form of a square standing on one corner, with a diagonal length of 2 cm. Precision in the brain­hand coordination test can be evaluated by asking the trainee to touch each mark with the probe in a clockwise fashion. Several prospective trials have been conducted in recent years to provide objective evidence that participants benefit from simulator training. These included manual skills, ulcer hemostasis using injection, a coagulation probe and hemoclipping, as well as variceal band ligation. After a period of 7 months, the intensive training group had significantly improved in all disciplines, while the conventional clinical group had only improved in variceal band ligation. The results of the real hemostasis cases performed in the New York study highlight this potential. However, many manufacturers have already now made specific certified training and supervision of the first clinical cases obligatory for new suturing, closure, or resective devices. There is little doubt that the knowledge and skills gained once may decline over time. Apart from sphincterotomy volume, little is known about deterioration of skill or outcome with infrequently practiced techniques. British experience with web-based e-portfolio of trainees and independent endoscopists highlights that central monitoring of practice may play a role in the future. Gastroenterology training in Europe-unmet educational needs beyond the machines: response from the European Section and Board of Gastroenterology. Progressive learning in endoscopy simulation training improves clinical performance: a blinded randomized trial. Training to competency in colonoscopy: assessing and defining competency standards. Assessment of competency in endoscopy: establishing and validating generalizable competency benchmarks for colonoscopy. The validity and reliability of a direct observation of procedural skills assessment tool: assessing colonoscopic skills of senior endoscopists. Adverse outcomes of endoscopic retrograde cholangiopancreatography: avoidance and management. Tablet computer-based multimedia enhanced medical training improves performance in gastroenterology and endoscopy board style exam compared with traditional medical education. The state of simulation in endoscopy education: continuing to advance toward our goals. Experimental endoscopic submucosal dissection training in a porcine model: learning experience of skilled Western endoscopists. Gastrointest Endosc 2006;64:570­576 Sedlack R, Petersen B, Binmoeller K, Kolars J. The complementary Erlangen active simulator for interventional endoscopy training is superior to solely clinical education in endoscopic hemostasis: the French training project: a prospective trial. We will provide a basic overview on how to design clinical trials, generate research ideas, write grants, and conduct day-to-day clinical research. We will provide valuable information on how to present at national and international meetings and write and publish manuscripts. Finally, we will cover issues such as ethics and the future of scientific publications. Clinical research provides value through guiding physicians and other caregivers on how to choose the optimal method of diagnosing and treating diseases. It is fundamentally different from basic research, which focuses on mechanisms of diseases as well as normal and abnormal biological processes. In our daily practice, we struggle through decisions in virtually all patients including, which diagnostic tests to perform, what the optimal treatments are, and how to deal with the costs and adverse effects of our diagnostic and treatment approaches. High-value clinical research should include several key elements including: Selecting clinically relevant interventions for comparison to current standards of care. All clinical trials should be performed in a rigorous scientific manner that adheres to several key principles to provide accurate and reliable information. The value of clinical trials is only as great as the extent to which those results are communicated and made available to patients, colleagues, and providers. The process of scientific publication has long been the mechanism by which we communicate these results, although many other options are increasingly available; such as communication at scientific conferences, internet, and social-media based methods of data sharing. Large federal grants are even more competitive with funding rates now less than 10%. Thus, even excellent research proposals and papers may be rejected for funding and publication. To ultimately succeed, clinical investigators must be willing to accept the short-term failures and persist in conducting and publishing the research they believe in. Many of the best research projects occur at the boundary zones between different areas of expertise. A specific example of this is our research on the role of endoscopic ultrasound in lung cancer. Beyond physicians, a successful team should include senior mentors, junior investigators, statisticians, experts in clinical trial design, study coordinators, and editorial assistants. Most academic medical centers include research activities as a part of their core curriculum. In addition to clinical fellows, who spend part of their time doing research, many programs offer dedicated research fellowships in clinical investigation. These programs often include dedicated training in research methodologies and advanced degrees such as a Master or Doctoral degree.

Most people drink liquids and eat a light diet the day of the operation and then resume their usual diet the next day birth control for women gynecologists purchase levlen mastercard. Short bowel syndrome is a group of problems related to poor absorption of nutrients birth control pills mix up order levlen 0.15 mg. Short bowel syndrome typically occurs in people who have: Had at least half of their small intestine removed and sometimes all or part of their large intestine removed Significant damage of the small intestine Poor motility birth control pills 3 weeks cheap levlen online, or movement birth control pills yellow purchase levlen cheap online, inside the intestines Short bowel syndrome may be mild birth control pills and migraines order levlen 0.15 mg online, moderate, or severe, depending on how well the small intestine is working. People with short bowel syndrome cannot absorb enough water, vitamins, minerals, protein, fat, calories, and other nutrients from food. What nutrients the small intestine has trouble absorbing depends on which section of the small intestine has been damaged or removed. The small intestine is the tube-shaped organ between the stomach and large intestine. The small intestine is about 20 feet long and includes the duodenum, jejunum, and ileum: Duodenum-the first part of the small intestine, where iron and other minerals are absorbed Jejunum-the middle section of the small intestine, where carbohydrates, proteins, fat, and most vitamins are absorbed Ileum-the lower end of the small intestine, where bile acids and vitamin B12 are absorbed What Is the Large Intestine The large intestine is about five feet long in adults and absorbs water and any remaining nutrients from partially digested food passed 424 Other Disorders of the Lower Gastrointestinal Tract from the small intestine. The large intestine then changes waste from liquid to a solid matter called stool. What Causes Short Bowel Syndrome the main cause of short bowel syndrome is surgery to remove a portion of the small intestine. Some children are born with an abnormally short small intestine or with part of their bowel missing, which can cause short bowel syndrome. In infants, short bowel syndrome most commonly occurs following surgery to treat necrotizing enterocolitis, a condition in which part of the tissue in the intestines is destroyed. Even if a person does not have surgery, disease or injury can damage the small intestine. Dehydration means the body lacks enough fluid and electrolytes-chemicals in salts, including sodium, potassium, and chloride- to work properly. Malnutrition is a condition that develops when the body does not get the right amount of vitamins, minerals, and nutrients it needs to maintain healthy tissues and organ function. These problems can be severe and can be life threatening without proper treatment. Other signs and symptoms may include: Bloating Cramping Fatigue, or feeling tired Foul-smelling stool Heartburn Too much gas Vomiting Weakness People with short bowel syndrome are also more likely to develop food allergies and sensitivities, such as lactose intolerance. Lactose intolerance is a condition in which people have digestive symptoms-such as bloating, diarrhea, and gas-after eating or drinking milk or milk products. The complications of short bowel syndrome may include: Malnutrition 426 Other Disorders of the Lower Gastrointestinal Tract Peptic ulcers-sores on the lining of the stomach or duodenum caused by too much gastric acid Kidney stones-solid pieces of material that form in the kidneys Small intestinal bacterial overgrowth-a condition in which abnormally large numbers of bacteria grow in the small intestine How Is Short Bowel Syndrome Diagnosed He or she will ask the patient about symptoms and may request a history of past operations. The patient collects stool in plastic wrap that he or she lays over the toilet seat and places a sample into a container. For children wearing diapers, the parent or caretaker can line the diaper with plastic to collect the stool. X-Ray An X-ray is a picture created by using radiation and recorded on film or on a computer. An X-ray technician performs the X-ray at a hospital or an outpatient center, and a radiologist-a doctor who specializes in medical imaging-interprets the images. An X-ray of the small intestine can show that the last segment of the large intestine is narrower than normal. Blocked stool causes the part of the intestine just before this narrow segment to stretch and bulge. A healthcare provider will give the patient specific instructions about eating and drinking after the test. Computerized Tomography Scan Computerized tomography scans use a combination of X-rays and computer technology to create images. Surgery used to treat short bowel syndrome includes procedures that: Prevent blockage and preserve the length of the small intestine Narrow any dilated segment of the small intestine Slow the time it takes for food to travel through the small intestine Lengthen the small intestine Long-term treatment and recovery, which for some may take years, depend in part on: What sections of the small intestine were removed How much of the intestine is damaged How well the muscles of the intestine work How well the remaining small intestine adapts over time Intestinal Transplant An intestinal transplant is surgery to remove a diseased or an injured small intestine and replace it with a healthy small intestine from a person who has just died, called a donor. Patients may receive enteral nutrition or continue normal eating, even though most of the nutrients are not absorbed. Both enteral nutrition and normal eating stimulate the remaining intestine to work better and may allow patients to discontinue parenteral nutrition. Some patients with severe short bowel syndrome require parenteral nutrition indefinitely or surgery. People can ask their healthcare providers about surgical techniques that minimize scar tissue. Scientists have not yet found a way to prevent short bowel syndrome that is present at birth, as its cause is unknown. Eating, Diet, and Nutrition Researchers have not found that eating, diet, and nutrition play a role in causing or preventing short bowel syndrome. The liver has many important functions, including: Taking up, storing, and processing nutrients from food- including fat, sugar, and protein-and delivering them to the rest of the body when needed Making new proteins, such as clotting factors and immune factors Producing bile. In addition to carrying toxins and waste products out of the body, bile helps the body digest fats and the fatsoluble vitamins A, D, E, and K Removing waste products the kidneys cannot remove, such as fats, cholesterol, toxins, and medications this article contains text excerpted from the following sources: Text under the heading "What Is Liver Reviewed September 2018; Text beginning with the heading "What Is Viral Hepatitis However, if injury to the liver is too severe or long lasting, regeneration is incomplete and the liver creates scar tissue. Inflammation happens when your immune system senses a danger, like a virus, and sends white blood cells to surround the area to protect your body. Hepatitis damages the liver and can cause scarring of the liver, called cirrhosis. It also cleans alcohol and other toxins from your blood, helps your stomach and intestines digest food, and makes proteins that your body needs to control and stop bleeding. The most common types of viral hepatitis in the United States are: Hepatitis A 436 Viral Hepatitis Hepatitis B Hepatitis C Does Viral Hepatitis Affect Women Differently Than Men Hepatitis B affects women differently than men: Birth control Women with severe liver damage may not be able to use birth control. Talk to your doctor about taking hepatitis B medicine to lower the risk of passing hepatitis B to your baby. Certain hepatitis B medicines are safe to take during pregnancy but are not recommended for everyone. Hepatitis C affects women differently than men: Younger women Research shows that acute (short-term) hepatitis C goes away on its own more often for younger women than men. Also, in women with chronic hepatitis C, liver damage usually happens more slowly than it does for men. Since hepatitis C is spread through blood, the risk of passing hepatitis C to a partner is higher during your menstrual period. But hepatitis C raises your risk for pregnancy complications such as premature birth and 437 Gastrointestinal Diseases and Disorders Sourcebook, 4th Ed. Some hepatitis C medicines can also cause serious harm to your baby if taken during pregnancy. Hepatitis C medicines also may not work as well for women after menopause as they do for men. The percentage of people with hepatitis A has gone down by 95 percent since the hepatitis A vaccine became available in 1995. Asian-Americans and Pacific Islanders have the highest rates of hepatitis B infection. About 50 percent of the people living with Hepatitis B are Asian-Americans and Pacific Islanders. Babies born with hepatitis B are likely to have it their entire lives and are at higher risk of liver damage and liver cancer. If an infant or toddler had hepatitis A and soiled the changing area, others who come into contact with the stool could become infected. You are more likely to get hepatitis A if you travel out of the country to a developing country with poor sanitation or without access to clean water and have not gotten vaccinated for hepatitis A. Hands or drug preparation equipment that have even tiny amounts of blood on them can spread hepatitis B. Hepatitis C is usually spread through: Sharing or reusing needles, syringes, and drug preparation equipment such as cookers and cotton when injecting drugs. Hands or drug preparation equipment that 439 Gastrointestinal Diseases and Disorders Sourcebook, 4th Ed. New hepatitis A infections usually cause symptoms, but as many as half the people with new hepatitis B and hepatitis C infections do not have symptoms. People with chronic hepatitis B or C often develop symptoms when their liver becomes damaged. This is because three in four adults with hepatitis C are baby boomers, and most baby boomers do not know they have it. Your doctor will: Ask questions about your health history Do a physical exam Order blood tests that look for parts of the virus or antibodies that your body makes in response to the virus. Some people recover from the acute infection and cannot spread the infection to others. For other people, the infection develops into a chronic infection and can be spread to others. Hepatitis A causes only acute infection, but hepatitis B and C often cause chronic 441 Gastrointestinal Diseases and Disorders Sourcebook, 4th Ed. If you have acute hepatitis A, B, or C, you may feel sick for a few months before you get better. Avoid alcohol and certain medicines, like the pain reliever acetaminophen, because they can damage the liver during this time. Some people with acute viral hepatitis need to be hospitalized to manage the symptoms. If you have chronic viral hepatitis, your treatment depends on the type of hepatitis you have: Hepatitis B You will probably meet with your doctor regularly, every 6­12 months, to watch for signs of liver disease and liver cancer. You may need antiviral medicines to treat hepatitis B, but many people do not need medicine. If you have health insurance, ask about your copay or coinsurance and which medicines are covered under your plan. Most people recover from hepatitis A with no treatment or long-lasting health problems. Chronic hepatitis B and C can lead to serious health problems, such as: Cirrhosis or scarring of the liver Liver cancer Liver failure People with liver failure may need a liver transplant to survive. In the United States, cirrhosis caused by chronic hepatitis C is currently the most common reason for needing a liver transplant. Call your doctor or your local or state health department if you think you may have been exposed. If you have health insurance, ask about your copay and coinsurance and which medicines are covered under your plan. The hepatitis A and hepatitis B vaccines are recommended for anyone who wants protection from the viruses and for people with certain risk factors and health problems. Viral hepatitis can be passed through menstrual blood, vaginal fluid, and semen (cum). Make sure to put the condom on before the penis touches your vagina, mouth, or anus. Other methods of birth control like birth control pills, shots, implants, or diaphragms, will not protect you from viral hepatitis. Your risk of getting viral hepatitis goes up with the number of lifetime sex partners you have. The vaccine is recommended for: All children, starting at 1 year (12­23 months old) Men who have sex with men People who travel or work in a part of the world where hepatitis A is common, such as certain parts of Central or South America, Asia, Africa, and eastern Europe. During your lifetime, you need: One series of the hepatitis A vaccine (two shots given at least six months apart) One series of the hepatitis B vaccine (three or four shots given over a six-month period) 445 Gastrointestinal Diseases and Disorders Sourcebook, 4th Ed. But if you have had dialysis, a medical procedure to clean your blood, or have a weakened immune system, your doctor might recommend additional doses of the hepatitis B vaccine. Scar tissue replaces healthy liver tissue and prevents your liver from working normally. Many people are not aware that they have cirrhosis, since they may not have signs or symptoms until their liver is badly damaged. Researchers estimate that about 1 in 400 adults in the United States has cirrhosis. Researchers believe the actual numbers may be higher because many people with cirrhosis are not diagnosed. People are also more likely to get cirrhosis if they: Have abused alcohol for a long time Have type 2 diabetes Are men Are older than age 50 What Are the Complications of Cirrhosis Portal Hypertension Portal hypertension is the most common serious complication of cirrhosis. Portal hypertension is a condition that occurs when scar tissue partly blocks and slows the normal flow of blood through your liver, which causes high blood pressure in the portal vein. Other Complications Other complications of cirrhosis may include: Bone diseases, such as osteoporosis Gallstones Problems with the bile ducts-the tubes that carry bile out of the liver Malabsorption and malnutrition Bruising and bleeding easily Sensitivity to medicines Insulin resistance and type 2 diabetes What Are the Symptoms of Cirrhosis Early symptoms of cirrhosis may include: Feeling tired or weak Poor appetite Losing weight without trying Nausea and vomiting Mild pain or discomfort in the upper right side of your abdomen 449 Gastrointestinal Diseases and Disorders Sourcebook, 4th Ed. As liver function gets worse, you may have other symptoms, including: Bruising and bleeding easily Confusion, difficulties thinking, memory loss, personality changes, or sleep disorders Swelling in your lower legs, ankles, or feet, called edema Bloating from buildup of fluid in your abdomen, called ascites Severe itchy skin Darkening of the color of your urine Yellowish tint to the whites of your eyes and skin called jaundice What Causes Cirrhosis Cirrhosis has different causes. Doctors diagnose cirrhosis based on your medical history, a physical exam, and the results of tests.

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There have been dozens of studies analyzing risk factors for fracture among pre- and postmenopausal women birth control for depression generic levlen 0.15 mg without prescription. The vast majority of these studies have found no adverse effect of a history of lactation or lifetime duration of lactation on peak bone mass birth control for women gifts buy 0.15 mg levlen, bone density birth control yeast infections purchase levlen no prescription, or hip fracture risk; indeed birth control zoely levlen 0.15 mg purchase visa, some studies found that lactation confers a protective effect against future risk of fracture birth control for women 80s fashion best order for levlen. Increased bone resorption releases calcium and phosphate into the blood stream, which then reaches the breast ducts and is actively pumped into the breast milk. J Mammary Gland Biol Neoplasia 2005;10(2):105­18, copyright 2005 Springer Science and Business Media B. However, rodents are not susceptible to vertebral compression fractures, likely because ambulation on all fours reduces loading of the spine. No spontaneous fractures were noted in Ctcgrp null mice despite a 55% decrease in the mineral content of the spine during lactation. Ambulating on the hindlimbs loads the axial skeleton; consequently, humans are susceptible to vertebral crush fractures when the material properties of the spine are compromised. Secondary causes of osteoporosis may be present, including anorexia nervosa, hyperparathyroidism, osteogenesis imperfecta, and corticosteroid or heparin therapy. For most women with confirmed fractures, pharmacological treatment may be unnecessary due to spontaneous increases in bone mass postweaning and typically self-limited duration of any pain. Most women can be reassured that the problem does not usually recur after subsequent pregnancies. As the outcome is uncertain, these women should be observed more closely with adjustments in calcium and calcitriol intake made as needed. A decision to breast feed may influence whether a parathyroidectomy should be done postpartum. A low calcium intake accentuates skeletal losses and increases the risk of sudden death from presumed hypocalcemia. There are no data on the sufficiency of calcium intake needed to ensure skeletal recovery after lactation. In humans the calcium content of milk may be largely derived from skeletal resorption. Vitamin D and calcitriol do not appear to play a significant role as severely vitamin D­deficient rats and Vdr null mice lactate normally and have a normal magnitude of bone loss. After weaning, bone formation increases and Vdr null mice restore the lost bone mass, but rats differ on the extent of bone restoration postweaning. No studies have examined the impact of vitamin D deficiency or insufficiency on skeletal recovery after weaning; however, as dozens of epidemiological studies found no adverse effect of number and duration of lactation on the risk of low bone mass or osteoporosis, and vitamin D insufficiency is common among reproductive age women, it seems probable that skeletal recovery after weaning does not require vitamin D. Serum phosphorus normalized during lactation in a woman with XlH,116 likely the result of the normal increase in skeletal resorption. However, milk phosphorus content was 50% of normal in two cases,116,117 and normalized with oral phosphorus supplementation. The fetal calcium demand is met by a doubling of intestinal calcium absorption beginning early in pregnancy, an adaptation that 2. There may be some contribution of calcium from skeletal stores whereas the maternal kidneys output more calcium than normal during pregnancy. During lactation, skeletal resorption is the dominant mechanism by which calcium is supplied to the breast milk. Renal calcium conservation occurs and only minimal dietary intake of calcium may required. Consistent with this, women with very low or high intakes of calcium experience a similar degree of bone loss during lactation. The rapidity of calcium regain by the skeleton of the lactating woman occurs through a mechanism that is not understood. Finally, while a few women will experience fragility fractures in association with pregnancy or lactation, for the vast majority of women these adaptations in calcium and bone metabolism during pregnancy and lactation are silent, without long-term adverse consequences. Maternal-fetal calcium and bone metabolism during pregnancy, puerperium, and lactation. Bone development and mineral homeostasis in the fetus and neonate: roles of the calciotropic and phosphotropic hormones. Metabolic relationship of calcium, magnesium and phosphorus in the foetus and newly born. Changes in calciotrophic hormones and biochemical markers of bone turnover in normal human pregnancy. Calcium homeostasis and bone metabolism during pregnancy, lactation, and postweaning: a longitudinal study. Serum ionized calcium and intact parathyroid hormone levels during pregnancy and postpartum. Calcium-regulating hormones and osteocalcin levels during pregnancy: a longitudinal study. Calcitonin modulates skeletal mineral loss during lactation through interactions in mammary tissue and directly though osteoclasts in bone. Absence of calcitriol causes increased lactational bone loss and lower milk calcium, but does not impair post-lactation bone recovery in Cyp27b1 null mice. Thyroid and parathyroid-independent increase in plasma 1,25-dihydroxyvitamin D during late pregnancy in the rat. Perinatal 1,25-dihydroxycholecalciferol in the sheep and its role in the maintenance of the transplacental calcium gradient. Pregnancy decreases immunoreactive parathyroid hormone level in rats with chronic renal failure. Pregnant rats with 5/6 nephrectomy have normal volume expansion despite lower renin and kallikrein. Does the maternal kidney contribute to the increased circulating 1,25-dihydroxyvitamin D concentrations during pregnancy Immunoextracted calcitonin in milk and plasma from totally thyroidectomized women. Circulating levels of soluble alpha-klotho are markedly elevated in human umbilical cord blood. Bone modeling in bromocriptine-treated pregnant and lactating rats: possible osteoregulatory role of prolactin in lactation. Vitamin D-independent intestinal calcium and phosphorus absorption during reproduction. Intestinal calcium transport, serum calcium, immunoreactive parathyroid hormone and calcitonin. Stimulation of intestinal calcium transport and bone calcium mobilization by prolactin in vitamin Ddeficient rats. Studies on the effects of placental lactogen on calcium metabolism during pregnancy. Charoenphandhu N, Nakkrasae lI, kraidith k, Teerapornpuntakit J, Thongchote k, Thongon N, et al. Two-step stimulation of intestinal Ca(2+) absorption during lactation by long-term prolactin exposure and suckling-induced prolactin surge. The effect of elevated prolactin levels on plasma 1,25-dihydroxyvitamin D and intestinal absorption of calcium. Cancellous and cortical bone mechanical properties and tissue dynamics during pregnancy, lactation, and postlactation in the rat. Weaning triggers a decrease in receptor activator of nuclear factor-kappaB ligand expression, widespread osteoclast apoptosis, and rapid recovery of bone mass after lactation in mice. Changes in bone mineral density and body composition during pregnancy and postpartum. Changes in bone mineral density of the os calcis as measured by quantitative ultrasound during pregnancy and 24 months after delivery. Pregnancy and lactation as risk factors for subsequent bone loss and osteoporosis. Presentation and management of osteoporosis presenting in association with pregnancy or lactation. Regulation of murine fetal-placental calcium metabolism by the calcium-sensing receptor. Hyperparathyroidism during pregnancy and the effect of rising calcium on pregnancy loss: a call for earlier intervention. Symptomatic hypocalcemia and hypoparathyroidism in two infants of mothers with hyperparathyroidism and familial benign hypercalcemia. Decreased calcitriol requirement during pregnancy and lactation with a window of increased requirement immediately post partum. Relationship of estrogen and pregnancy to calcium homeostasis in pseudohypoparathyroidism. Human placental production of 1a,25dihydroxyvitamin D3: biochemical characterization and production in normal subjects and patients with pseudohypoparathyroidism. Transient neonatal hyperparathyroidism secondary to maternal pseudohypoparathyroidism. Parathyroid hormone-related protein and hypercalcemia secondary to massive mammary hyperplasia. Gigantic mammary hyperplasia in pregnancy associated with pseudohyperparathyroidism. Hypercalcemia in pregnancy and lactation associated with parathyroid hormone-related protein [letter]. Milk-alkali syndrome in pregnancy, associated with elevated levels of parathyroid hormone-related protein. Vitamin D supplements in pregnant Asian women: effects on calcium status and fetal growth. A suggested physiological role of calcitonin: the protection of the skeleton during pregnancy and lactation. A mouse model of human familial hypocalciuric hypercalcemia and neonatal severe hyperparathyroidism. Normal milk composition in lactating X-linked hypophosphatemic mice despite continued hypophosphatemia. Homozygous ablation of fibroblast growth factor-23 results in hyperphosphatemia and impaired skeletogenesis, and reverses hypophosphatemia in Phex-deficient mice. Intestine, bone, and mammary gland contributions to maternal plasma calcium increase after abrupt weaning. Mammary-specific deletion of parathyroid hormonerelated protein preserves bone mass during lactation. Role of vitamin D in maternal skeletal changes during pregnancy and lactation: a histomorphometric study. Calcitonin inhibition of prolactin secretion in lactating rats: mechanism of action. Targeted overexpression of calcitonin in gonadotrophs of transgenic mice leads to chronic hypoprolactinemia. The calcium-sensing receptor regulates mammary gland parathyroid hormone-related protein production and calcium transport. Hypercalcemia in a woman with hypoparathyroidism associated with increased parathyroid hormonerelated protein during lactation. Oxytocin release and plasma anterior pituitary and gonadal hormones in women during lactation. Oxytocin is required for nursing but is not essential for parturition or reproductive behavior. The calcium-sensing receptor regulates plasma membrane calcium adenosine triphosphatase isoform 2 activity in mammary epithelial cells: a mechanism for calcium-regulated calcium transport into milk. Induction of calcitonin and calcitonin receptor expression in rat mammary tissue during pregnancy. Accelerated mammary gland development during pregnancy and delayed postlactational involution in vitamin D3 receptor null mice. Regulation of parathyroid hormone-related peptide by estradiol: effect on tumor growth and metastasis in vitro and in vivo. Calcium metabolism during lactation: enhanced intestinal calcium absorption in vitamin D-deprived, hypocalcemic rats. The effect of calcium supplementation on bone density during lactation and after weaning. Changes in bone mineral density and markers of bone remodeling during lactation and postweaning in women consuming high amounts of calcium. Bone changes after 3 mo of lactation: influence of calcium intake, breast-milk output, and vitamin D-receptor genotype. Rapid inactivation and apoptosis of osteoclasts in the maternal skeleton during the bone remodeling reversal at the end of lactation. Site-specific changes in bone microarchitecture, mineralization, and stiffness during lactation and after weaning in mice. Maintenance of serum calcium by parathyroid hormone-related peptide during lactation in a hypoparathyroid patient. Human lactation: forearm trabecular bone loss, increased bone turnover, and renal conservation of calcium and inorganic phosphate with recovery of bone mass following weaning. Calcium requirements of lactating Gambian mothers: effects of a calcium supplement on breast-milk calcium concentration, maternal bone mineral content, and urinary calcium excretion. Biochemical markers of calcium and bone metabolism during 18 months of lactation in Gambian women accustomed to a low calcium intake and in those consuming a calcium supplement. Vitamin D status does not influence the breast-milk calcium concentration of lactating mothers accustomed to a low calcium intake. For most complex traits and common diseases11­13 hundreds if not thousands of variants of weak (but real) effects14 will be underlying the genetic architecture of the trait and disease. From this perspective, only well-powered studies based on several independent populations (for replication), with a well-defined selection of polymorphisms and gene regions, and a robust control for multiple hypothesis-testing in the analysis, will be suited to identify genuine genetic effects. Nevertheless, after replication in tens to hundreds of thousands of individuals, it is very likely that genome-wide significant signals associated at a stringent P < 5 × 10-8 will be associated with variants which represent true underlying biological mechanisms influencing the trait in question.

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