Anna Mae Diehl, MD

• Professor of Medicine
• Florence McAlister Distinguished Professor of Medicine
• Professor in Molecular Genetics and Microbiology
• Member of the Duke Cancer Institute
• Affiliate of the Regeneration Next Initiative

https://medicine.duke.edu/faculty/anna-mae-diehl-md

However arrhythmia treatment carvedilol 6.25 mg order fast delivery, the complexity of the mechanisms and the interactions between them prevent the use of only one studying method arteria sphenopalatina discount carvedilol 25 mg with visa. Author details Sébastien Lefebvre prehypertension range chart discount carvedilol 12.5 mg overnight delivery, Etienne Benoit and Virginie Lattard* *Address all correspondence to: virginie heart attack in spanish carvedilol 6.25 mg online. Antithrombotic therapy in 2014: Making headway in anticoagulant and antiplatelet therapy pulse pressure graph purchase carvedilol with paypal. Bleeding complications with warfarin use: A prevalent adverse effect resulting in regulatory action. Phyllo quinone (vitamin K1) biosynthesis in plants: Two peroxisomal thioesterases of lacto bacillales origin hydrolyze 1,4-dihydroxy-2-naphthoyl-coa. Conversion of Phylloquinone (Vitamin K1) into Menaquinone-4 (Vitamin K2) in Mice two possible routes for menaquinone-4 accumulation in cerebra of mice. The production of menaquinones (vitamin K2) by intestinal bacteria and their role in maintaining coagulation homeostasis. Proteins involved in uptake, intracellular transport and basolateral secretion of fat-soluble vitamins and carotenoids by mammalian enterocytes. Hypercoagulable state and thromboembolism following warfarin withdrawal in post-myocardial-infarction patients. Initiation of warfarin in patients with atrial fibrillation: Early effects on ischaemic strokes. Vitamin K nutrition, metabolism, and require ments: Current concepts and future research. The propeptide of rat bone gamma-carboxyglutamic acid protein shares homology with other vitamin K-dependent protein precursors. The propeptides of the vitamin K-dependent proteins possess different affinities for the vitamin K-dependent carboxylase. Vitamin K-dependent gammacarbon-hydrogen bond cleavage and nonmandatory concurrent carboxylation of peptide-bound glutamic acid residues. Structural and functional insights into human vitamin K epoxide reductase and vitamin K epoxide reductase-like1. Linkages between genes for coat colour and resistance to warfarin in Rattus norvegicus. Homozygosity mapping of a second gene locus for hereditary combined deficiency of vitamin K­ dependent clotting factors to the centromeric region of chromosome 16. Engineering of a recombinant vitamin Kdependent -carboxylation system with enhanced -carboxyglutamic acid forming capacity evidence for a functional cxxc redox center in the system. The conversion of vitamin K epoxide to vitamin K quinone and vitamin K quinone to vitamin K hydroquinone uses the same active site cysteines. Human vitamin K epoxide reductase and its bacterial homologue have different membrane topologies and reaction mechanisms. The synthesis of the -diketone derived from the hemorrhagic agent through alkaline degradation. Warfarin binding to microsomes isolated from normal and warfarin-resistant rat liver. Warfarin resistance: Vitamin K epoxide reductase of scottish resistance genes is not irreversibly blocked by warfarin. Pharmacoki netic interaction between warfarin and a uricosuric agent, bucolome: Application of in vitro approaches to predicting in vivo reduction of (s)-warfarin clearance. Case of apparent resistance of rattus norvegicus berkenhout to anticoagulant poisons. Revised methodology for a blood-clotting response test for identification of warfarin-resistant Norway rats (Rattus norvegicus). The development of a blood clotting response test for discriminating between difenacoum-resistant and susceptible 40 Anticoagulation Therapy Norway rats (Rattus norvegicus, berk. Inhibition by warfarin of liver microsomal vitamin K-reductase in warfarin-resistant and susceptible rats. Characterization and purification of the vitamin K1 2,3 epoxide reductase system from rat liver. Co-purification of microsomal epoxide hydrolase with the warfarin-sensitive vitamin K1 oxide reductase of the vitamin K cycle. Membrane composition influen ces the activity of in vitro refolded human vitamin K epoxide reductase. Molecular charac terization of a purified 5-ht4 receptor a structural basis for drug efficacy. Tris(3-hydroxyprop yl)phosphine is superior to dithiothreitol for in vitro assessment of vitamin K 2,3epoxide reductase activity. A cellular system for quantitation of vitamin K cycle activity: Structure-activity effects on vitamin K antagonism by warfarin metabolites. Vitamin K epoxide reductase significantly improves carboxylation in a cell line overexpressing factor X. Pharma cogenetic profile of a South Portuguese population: Results from the pilot study of the European Health Examination Survey in Portugal. Pharmacodynamic resistance to warfarin associated with a Val66Met substitution in vitamin K epoxide reductase complex subunit 1. Trp59Arg) in a patient with partial resistance to acenocoumarol and phenprocoumon. Genetic resistance to warfarin therapy masked by amiodarone in a 2-year-old girl with mitral valve replacement. Distribution of rodenticide resistance and zoonotic pathogens in Norway rats in Lower Saxony and Hamburg, Germany. Anticoagulant resistance in the United Kingdom and a new guideline for the management of resistant infestations of Norway rats (Rattus norvegicus Berk. Large-scale structure of brown rat (Rattus norvegicus) populations in England: Effects on rodenti cide resistance. Vitamin K requirement in Danish anticoagulant-resistant Norway rats (Rattus norvegicus). Differential expression of cytochrome P450 genes between bromadiolone-resistant and anticoagulant-suscepti ble Norway rats: A possible role for pharmacokinetics in bromadiolone resistance. Elevated warfarin metabolism in warfarin-resistant roof rats (rattus rattus) in Tokyo. The modern methods of laboratory diagnostics of thrombotic state of readiness are considered to initiate thromboprophylaxis in patients irrespective of the presence of thrombophilia, as well as certain thrombogenic risk factors. Keywords: venous thromboembolism, thrombogenic risk factors, thrombophilia, hep arin prophylaxis 1. The association of tendency to thrombus formation with pregnancy complications and fetal death syndrome is equally significant [8, 9]. However, carrying of a pregnancy and the postpartum period are determined as confirmed risk factors for venous thrombosis and pulmonary embolism with the incidence being 4­50 times higher than in non-pregnant women [10­12]. However, a 20-year cumulative incidence of post-thrombotic syn drome after proximal deep vein thrombosis are about 40%. These are important, many-sided consolidated documents, which determine the modern level of knowledge on this issue. However, their structure involves such risk factors as peculiarities of scheduled operation and the type of anesthesia, a history of thrombosis, and inherited or acquired likelihood to thrombosis for specific laboratory parameters. Anyway, these features discussed in the documents, from the standpoint of evidence-based medicine, are relatively significant for the prediction of risk for thrombosis and do not always answer the following important questions: the rationale behind the prescription of anticoagulants in a specific patient, optimal dosage, and the required duration of their use. Along with it, the discussion on the rationale behind laboratory monitoring of anticoagulant effects from the stand point of safety of used doses is continued and the determination of the effectiveness of the performed treatment that is presented in the review by Hassouna [23]. These approaches will involve the definition of throm bophilia and thrombogenic risk factors, as well as the state of thrombotic readiness when considering the advisability of heparin prophylaxis from the view point of personalized medicine. However, the presence of thrombogenic risk factors is often compared with throm bophilia, which leads to the over diagnosis of thrombophilia, especially during pregnancy and concomitant polypragmasy. Modern perspective on thrombophilia the attention of many researchers has always been on the possible causes and conditions in which thrombosis occurred. The risk of thrombosis is associated with trauma and surgical routines in the area of large venous lines (hip surgery, pelvic organ surgery), with other types of pathology and conditions which are predisposed to venous thrombosis (malignant tumors, obesity, diabetes, heart failure, prolonged immobilization, etc. Taking this into consideration, in 1884, Rudolf Virchow reported that venous thrombosis are the result of the presence of, at least, one of the three basic factors, including (1) stasis of blood in lower extremity veins, (2) increased ability of blood to thrombus formation-we understand it as thrombotic state of readiness, and (3) damaged vessel walls [26]. Gradation of the risk factors for venous thromboembolic complications in cardiac patients. Thus, it can be observed that there are no significant differences between thrombogenic risk factors and thrombophilia in modern guidelines and recommendations. The question about the definition of "thrombogenic risk factor" and "thrombophilia" It is believed that thrombophilia precedes and accompanies thrombosis and fetal loss syn drome [11, 32­34]. However, some clinicians deny the importance of genetic predisposition to the development of thrombosis, observed in Table 1, which is explained by the fact that the 52 Anticoagulation Therapy connection between these phenomena is not always seen [35]. Indeed, the direct association might be questionable, as evidenced by a number of publications, including a retrospective family cohort study involving 723 first- and second-degree relatives of 150 patients with venous thrombosis. The collected data in this study present interesting information about the importance of thrombotic risk in patients with inherited defects in the physiological anticoa gulation system, developability of which is relatively small. Thus, the cumulative lifetime likelihood of thrombosis occurrence (penetrance) among the carriers of the most common family thrombophilia (factor V Leiden mutation) is only about 10%. These thrombotic events are made possible in the presence of some mentioned gene polymorphisms, but when and how far, cannot be predicted and it depends on additional risk factors in certain cases, for example, dehydration, distress, or pregnancy. In this regard, there is a view that thrombosis are multifactorial (complex) disease that occurs when a person with identified thrombophilia is exposed to additional risk factors associated with the disease, due to personal characteristics, or due to the external environment [12]. The carriers of homozygous factor V Leiden mutation might have a higher risk under the influence of the environment or other genetic risk factors. The penetrance of thrombosis phenotype increases among patients with multiple genetic defects. The same indicator depends on the clinical effects of acquired risk factors, such as the use of combined oral contraceptives, pregnancy, or surgery. At the same time, as earlier mentioned (see Table 2), a number of acquired thrombogenic risk factors (major surgery, endoprosthesis replacement of large joints, hospitalization due to medical emergency, active cancer, etc. Despite this important and interesting information, it is still not clear-the difference between thrombogenic risk factors and thrombophilia. Vascular thrombosis - One or more cases of arterial and/or venous thrombosis or thrombosis of small vessels in any organ or tissue. Pregnancy failure - Three or more unexplained cases of miscarriage up to 10 weeks of gestation excluding anatomic, genetic, hormonal causes and chromosomal abnormalities; - One or more cases of intrauterine death of a normal fetus after 10 weeks of gestation; - One or more cases of premature birth of a fetus after less than 34 weeks of gestation occurring with evident fetoplacental insufficiency or severe gestosis Table 4. Anticardiolipin antibodies - the presence of isotypes IgG and IgM in high titers in two or more studies with an interval of not less than 12 weeks. Lupus anticoagulant - It is found in two or more consecutive tests with an interval of not less than 12 weeks We suggest an extension of this approach (involving the combination of certain thrombogenic risk factors with thrombosis or fetal loss syndrome) to the methodology of thrombophilia diagnostics. We consider that thrombophilia is essentially not a disease, but it is a pathological condition caused by a combination of risk factors, realized by the development of thrombosis (thrombo ses), which can be obtained according to the individual medical history. It is very important to understand and accept this position because susceptibility to the disease does not imply the presence of indications for primary or secondary prophylaxis or treatment [12]. Hypothesis about the interaction of thrombogenic risk factors, thrombotic readiness, and thrombophilia in the development of thrombosis and fetal loss syndrome. Presently, there are more than 100 variants of thrombophilia and various thrombogenic risk factors described, which are capable in their combination to lead to a vascular catastrophe [12, 42, 43]. However, it is believed as insufficient to divide them into hereditary (congenital) and acquired. The temporary and controllable risk factors are much more numerous, which, in turn, can be divided into, associated with lifestyle. Controllability of these risk factors is different and might be considered individually in all cases, from the point of view of both etiology and pathogenesis of thrombosis. Nowadays, the mentioned recommendations do not show the association between the presence of "thrombophilia", "thrombogenic risk factors", and blood coagulation activation for known laboratory markers. However, it can be suggested that blood coagulation activation is the main condition for thrombus formation and a prerequisite for heparin prophylaxis. Thrombotic readiness the terms "thrombophilia" and "hypercoagulability" are often considered by many authors as synonyms, but in real sense, these notions are different. Hypercoagulation or "hypercoa gulation syndrome/state" is a laboratory phenomenon by which "in vitro" with the help of special methods of hemostasis system analysis platelet activation and the process of fibrin formation, and in some cases, inhibition of fibrinolytic reactions are recognized. Hypercoagu lation can be promoted by drugs commonly used to treat bleeding in hemophilia, sepsis, inflammation, surgery, hemostasis, and atherosclerosis as well as by many other factors and conditions. However, it can appear in the analysis of hemostatic parameters-in the case of warfarin skin necrosis, associated with congenital protein C deficiency due to treatment with coumarins, heparin-induced thrombocytopenia with heparin prescription, and effects of lupus anticoagulant peculiar to antiphospholipid syndrome. Consequently, the notions such as "hypercoagulation syndrome" and "hypercoagulation state" do not meet the essence of the pathological process and should therefore be considered obsolete. Accordingly, a realization of this readiness with the continued risk factors and their multipli cation. Thus, the state of thrombotic readiness might be formed by cooperation of various thrombogenic risk factors and directly precedes thrombosis, and also accompanies it in its absence or the low efficiency of antithrombotic prophylaxis and therapy. The increase of D-dimer concentration is widely used in the diagnostics as a laboratory criterion for activation of hypercoagulation and fibrinolysis, under such human pathologies, as disseminated intravascular coagulation [47, 48], as well as deep vein thrombosis of the lower extremity and pulmonary embolism [49, 50]. Recent studies in this field involve diagnostic use of age-adjusted D-dimer cutoff levels in adult patients [17, 54]. In the liver, there is a synthesis of its precursor-prothrombin, which is further present in plasma and can be converted into -thrombin by blood coagulation activation. The total result of these reactions is considered to be the decrease of high initial rate of thrombin generation, which should be achieved in patients with thrombotic state of readiness. During thrombin generation test (with the use of fluorimeter and computer data processing), the area under the curve and the peak rate are measured having an ascending part, the area of achieving the maximum, and the descending part, which characterizes the inactivation of the enzyme. This test captures the end result of a complex array of enzymatic interactions involved in blood coagulation and reacts on any trend toward coagulation activation in blood plasma, as a result, it has integrated nature.

Despite these reports blood pressure reducers order carvedilol 25 mg mastercard, sodium phosphate preparations remain widely used for bowel preparation prior to colonoscopy hypertension disorder cheap 12.5 mg carvedilol fast delivery. The typical presentation of phosphate nephropathy involves an acute deterioration in kidney function days to weeks following a colonoscopy arrhythmia treatments buy carvedilol overnight. Kidney biopsy shows acute and chronic tubular injury atrial flutter treatment carvedilol 25 mg purchase visa, with calcium phosphate deposits (tubular calcifications) blood pressure medication for sleep buy carvedilol 25 mg without a prescription. Overall, such adverse renal effects are uncommon in patients treated with sodium phosphate, but for those select few who are affected, consequences may be serious. Similarly, the administration of high-dose fosphenytoin for seizure treatment in the setting of kidney dysfunction has been associated with hyperphosphatemia because phosphate is one of the major metabolites of this drug. Intracellular to Extracellular Shift of Phosphorus Respiratory Acidosis and Metabolic Acidosis. Respiratory acidosis does not appear to significantly alter the renal handling of phosphorus. Rather, efflux of phosphate from cells into the extracellular space is probably responsible for the hyperphosphatemia of respiratory acidosis. In lactic acidosis, this effect is intensified by tissue hypoxia and intracellular Pi release. Patients with uncontrolled diabetes mellitus are intracellularly phosphate-depleted, despite hyperphosphatemia, an abnormality that becomes unmasked once insulin therapy is initiated. Because phosphate is predominantly stored intracellularly, clinical conditions associated with increased catabolism and tissue destruction, such as rhabdomyolysis, fulminant hepatitis, hemolytic anemia, severe hyperthermia, and tumor lysis syndrome, often result in hyperphosphatemia. Tumor lysis syndrome is a constellation of metabolic abnormalities such as hyperuricemia, hyperkalemia, and hyperphosphatemia that is caused by rapid and massive breakdown of tumor cells. The syndrome typically occurs from 3 days before to 7 days after the initiation of chemotherapy. Malignant lymphoid cells may contain up to four times more intracellular phosphorus compared to mature lymphoid cells, which explains the high prevalence of hyperphosphatemia following chemotherapy in patients with lymphoid malignancies. The lactate dehydrogenase level before the initiation of therapy appears to correlate with the development of hyperphosphatemia and azotemia in these patients. Alkalinization may increase uric acid solubility in the tubules but requires caution; nephrocalcinosis can occur with aggressive alkalinization of the urine because calcium phosphate crystals usually precipitate in alkaline urine. Phosphate binders can be used to decrease the intestinal absorption of phosphate in patients who maintain their oral intake during chemotherapy, but the utility of these drugs is limited in this setting. Pseudohyperphosphatemia Spurious measurements of high plasma phosphorus levels may occur under certain conditions as a result of interference with the analytic method used. Treatment of chronic hyperphosphatemia is generally accomplished through dietary phosphate restriction, oral phosphate binders, and renal replacement therapy. Acute hyperphosphatemia in association with hypocalcemia requires rapid attention. Discontinuation of supplemental phosphates and initiation of hydration are indicated for patients with acute exogenous Pi overload and intact renal function. Volume expansion can significantly increase urinary phosphate excretion, but plasma calcium levels must be followed closely because further hypocalcemia may occur due to hemodilution. In patients with respiratory or metabolic acidosis, treatment of the underlying acidosis corrects the phosphate derangement. Similarly, in diabetic ketoacidosis, treatment with insulin and correction of metabolic acidosis rapidly reverses the hyperphosphatemia. Hypophosphatemia can occur in the presence of a low, normal, or high total body phosphorus content. Similarly, total body phosphate depletion may exist with low, normal, or high plasma Pi levels. In addition, erythrocytes experience a decrease in 2,3-diphosphoglycerate levels, which increases hemoglobin-oxygen affinity and prevents efficient oxygen delivery to tissues. Overt heart failure and respiratory failure as a result of decreased muscle performance may also be observed. Chronic hypophosphatemia can also lead to proximal and distal renal tubule defects resulting in water diuresis, glucosuria, bicarbonaturia, hypercalciuria, and hypermagnesuria. Shifts of phosphorus from the extracellular to intracellular space usually occur in the setting of an acute illness or treatment. The degree of hypophosphatemia observed is usually mild to moderate in severity; increased urinary phosphate excretion is balanced by mobilization of Pi from the bone and enhanced intestinal absorption of Pi. The prevalence of the disease is 1: 20,000, penetrance is high, and both females and males are affected. As a result, the major goal of therapy in these patients has been to allow normal growth and reduce bone pain. Some individuals initially present in childhood with phosphate from extracellular to intracellular fluid, or a combination of these mechanisms Table 19. Inherited diseases characterized by phosphaturia and hypophosphatemia can occur from a defect in endocrine pathways involved in the systemic regulation of phosphate homeostasis or from a direct mutation in local regulators of renal phosphate transport. In some individuals with early-onset disease, the phosphate wasting returns to normal after puberty. Reports describing families with autosomal recessive forms of hypophosphatemic rickets have also emerged. Medical treatment with phosphate supplementation and calcitriol is frequently necessary to improve bone healing in patients for whom tumor localization or resection is unsuccessful. Cinacalcet has also been used to induce hypoparathyroidism and decrease phosphate wasting, with good response,411 although hypocalcemia is always a concern when using this therapy in patients with normal renal function. Disorders of Proximal Tubule Inorganic Phosphorus Reabsorption Hereditary Hypophosphatemic Rickets with Hypercalciuria. Acquired causes include monoclonal gammopathies, amyloidosis, collagen vascular diseases, kidney transplant rejection, and many drugs or toxins, such as heavy metals, antineoplastic agents, antiretroviral agents, aminoglycosides, and anticonvulsants. Hypophosphatemia is observed in up to 90% of patients after kidney transplantation. Diuretics, including acetazolamide, loop diuretics, and some thiazides with carbonic anhydrase activity, such as metolazone, can increase phosphaturia. The volume contraction that accompanies the use of diuretics usually stimulates proximal tubular NaPi reabsorption and prevents the development of severe hypophosphatemia. Conversely, volume expansion with saline can cause phosphaturia and hypophosphatemia. Significant urinary losses of phosphate may lead to hypophosphatemia during recovery from acute tubular necrosis and from obstructive uropathy. Postoperative hypophosphatemia has been reported after liver resection, colorectal surgery, aortic bypass, and cardiothoracic surgery. Increased renal reabsorption of phosphorus can compensate for all but the most severe decreases in oral phosphate intake. However, if phosphate deprivation is prolonged and severe (<100 mg/ day), or if it coexists with diarrhea, the continued colonic secretion of phosphate can lead to hypophosphatemia. Hypophosphatemia seen in children with protein malnutrition and kwashiorkor correlates with increased mortality. Most phosphorus absorption occurs in the duodenum and jejunum, and intestinal disorders affecting the small intestine may lead to hypophosphatemia. Hypophosphatemia can develop quickly, even in patients given a relatively moderate but sustained dosage of phosphate binders. When combined with poor nutritional intake or extensive dialysis, this therapy may result in so-called overshoot hypophosphatemia. Prolonged use of phosphate-binding antacids can lead to clinically significant osteomalacia. Syndromes of vitamin D deficiency or resistance characterized by hypophosphatemia, hypocalcemia, and bone disease are discussed in an earlier section of this chapter that discusses hypocalcemia. Redistribution of phosphate from the extracellular space into cells is a common cause of hypophosphatemia in hospitalized patients. This shift of phosphate occurs by various mechanisms, including elevated levels of insulin, glucose, and catecholamines, respiratory alkalosis, increased cell proliferation (leukemia blast crisis, lymphoma), and rapid bone mineralization (hungry bone syndrome). The fall in carbon dioxide during acute respiratory alkalosis causes carbon dioxide diffusion from the intracellular space, increases intracellular pH, and stimulates glycolysis. The consequent increase in the formation of phosphorylated carbohydrates leads to a decrease in extracellular phosphorus levels. Hypophosphatemia is common in mechanically ventilated patients, particularly if they are also receiving glucose infusions. The urinary phosphate excretion can drop to undetectable levels, indicating maximal urinary Pi reabsorption. In chronically malnourished individuals, rapid refeeding can result in significant hypophosphatemia. The incidence of refeeding-related hypophosphatemia is high in hospitalized patients receiving parenteral nutrition, as high as one in three in one series. The maintenance of serum Pi in the normal range is essential in the management of refeeding syndrome. Adequate phosphate (20-30 mmol of Pi/L) in the parenteral nutrition formulation generally prevents this complication. Even higher amounts may be required for patients with diabetes or chronic alcoholism. Hypophosphatemia Resulting from Multiple Mechanisms alcoholic patients with poor intake, vitamin D deficiency, and heavy use of phosphate-binding antacids. Phosphorus deficiency is often not manifested as hypophosphatemia at the initial evaluation for medical care. Hypophosphatemic alcoholics are at high risk for the development of rhabdomyolysis. In uncontrolled diabetes, phosphate is released from cells and ultimately appears in the urine because of concomitant glycosuria, ketonuria, acidosis, and osmotic diuresis. During treatment of diabetic ketoacidosis, the development of hypophosphatemia is extremely common. Moderate, and at times severe, hypophosphatemia may be observed in acute leukemia in the leukemic phase of lymphomas458 and during hematopoietic reconstitution after stem cell transplantation. Hypophosphatemia has been observed in a woman with toxic shock syndrome460 and is commonly observed in sepsis,461 but the complicated clinical picture in septic patients makes it difficult to delineate a specific mechanism. Rapid volume expansion diminishes proximal tubule sodium phosphate reabsorption and may lead to transient hypophosphatemia. This is particularly true when Pi shift is the major cause of the hypophosphatemia. Patients with symptomatic hypophosphatemia and phosphate depletion do require replacement therapy. Because the serum level of phosphorus may not be an accurate reflection of total body stores, it is essentially impossible to predict the amount of phosphorus necessary to correct phosphorus deficiency and Alcoholism. Gaudio A, Pennisi P, Bratengeier C, et al: Increased sclerostin serum levels associated with bone formation and resorption markers in patients with immobilization-induced bone loss. Kitanaka S, Takeyama K, Murayama A, et al: Inactivating mutations in the 25-hydroxyvitamin D3 1alpha-hydroxylase gene in patients with pseudovitamin D-deficiency rickets. In mild or moderate hypophosphatemia, oral repletion with low-fat milk (containing 0. Alternatively, oral tablets containing 250 mg (8 mmol) of phosphorus from a combination of sodiumphosphate and potassium-phosphate salts can be prescribed. A typical patient with moderate to severe hypophosphatemia would probably need 1000 to 2000 mg (32 to 64 mmol) of phosphorus/day to have body stores repleted within 7 to 10 days. Various regimens are used in clinical practice, all based on uncontrolled observational studies. Some are more conservative in the amount of phosphate delivered to avoid side effects, which may include renal failure, hypocalcemic tetany, and hyperphosphatemia. Murer H, Hernando N, Forster I, et al: Proximal tubular phosphate reabsorption: Molecular mechanisms. In Goldman L, Ausiello D, editors: Cecil textbook of medicine, ed 23, Philadelphia, 2008, Elsevier, pp 2983­2996. Jain A, Bhayana S, Vlasschaert M, et al: A formula to predict corrected calcium in haemodialysis patients. Lind L, Skarfors E, Berglund L, et al: Serum calcium: a new, independent, prospective risk factor for myocardial infarction in middle-aged men followed for 18 years. Sociedade Brasileira de Endocrinologia e Metabologia, Bandeira F, Griz L, et al: Diagnosis and management of primary hyperparathyroidism-a scientific statement from the Department of Bone Metabolism, the Brazilian Society for Endocrinology and Metabolism. Rudberg C, Akerstrom G, Palmer M, et al: Late results of operation for primary hyperparathyroidism in 441 patients. Khan A, Grey A, Shoback D: Medical management of asymptomatic primary hyperparathyroidism: proceedings of the third international workshop. Hoelting T, Weber T, Werner J, et al: Surgical treatment of parathyroid carcinoma [review]. Mune T, Katakami H, Kato Y, et al: Production and secretion of parathyroid hormone-related protein in pheochromocytoma: participation of an alpha-adrenergic mechanism. Ezzat S, Melmed S, Endres D, et al: Biochemical assessment of bone formation and resorption in acromegaly. Hinnie J, Bell E, McKillop E, et al: the prevalence of familial hypocalciuric hypercalcemia. Bai M, Quinn S, Trivedi S, et al: Expression and characterization of inactivating and activating mutations in the human Ca2+osensing receptor. Bai M, Janicic N, Trivedi S, et al: Markedly reduced activity of mutant calcium-sensing receptor with an inserted Alu element from a kindred with familial hypocalciuric hypercalcemia and neonatal severe hyperparathyroidism. Bendz H, Sjodin I, Toss G, et al: Hyperparathyroidism and longterm lithium therapy-a cross-sectional study and the effect of lithium withdrawal. Marabelle A, Sapin V, Rousseau R, et al: Hypercalcemia and 13-cisretinoic acid in post-consolidation therapy of neuroblastoma.

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General treatment should always consist of initial vigorous gastric lavage with isotonic saline followed by administration of activated charcoal via nasogastric tube blood pressure 152 over 90 buy cheap carvedilol 6.25 mg on line. Treatment of the metabolic acidosis may be necessary arteria carotida buy cheapest carvedilol and carvedilol, because acidosis can enhance the entry of salicylate into the central nervous system arrhythmia heart rate monitor purchase carvedilol 12.5 mg mastercard. Hemodialysis may be necessary in severe poisoning blood pressure categories generic carvedilol 12.5 mg on-line, especially if renal failure coexists; it is preferred in cases of severe intoxication (>700 mg/L) and is superior to hemofiltration hypertension treatment guidelines order carvedilol 6.25 mg amex, which does not correct the acid-base abnormality. Disparity between the measured and calculated blood osmolality (high osmolar gap) is often present, especially in the first few hours after ingestion. Fluorescence of the urine detected by the Wood lamp (if the ingested ethylene glycol contains a fluorescent vehicle) has been suggested as a diagnostic indicator but is neither specific nor sensitive. Treatment includes prompt institution of osmotic diuresis, thiamine and pyridoxine supplementation, administration of 4-methylpyrazole (fomepizole),105 or ethyl alcohol administration and dialysis. Competitive inhibition of alcohol dehydrogenase with either fomepizole or ethyl alcohol is absolutely necessary in all patients to lessen toxicity, because ethanol and fomepizole compete for metabolic conversion of ethylene glycol and alter the cellular redox state. Fomepizole (initiated as a loading dose of 15 mg/kg, followed by 10 mg/kg every 12 hours), offers the advantages of a predictable decline in ethylene glycol levels without the adverse effect of excessive obtundation, as seen with ethyl alcohol infusion. When these measures have been accomplished, hemodialysis may be initiated to remove the ethylene glycol metabolites. If intravenous ethanol is the only inhibitor of alcohol dehydrogenase available, its infusion should be increased during hemodialysis to allow maintenance of the blood alcohol level in the range of 100 to 150 mg/dL or more than 22 mmol/L. Methanol has wide application in commercially available solvents and is used for industrial and automotive purposes. Sources include windshield wiper fluid, paint the Osmolar Gap in Toxin-Induced Acidosis. Under most physiologic conditions, Na+, urea, and glucose generate the osmotic pressure of blood. The calculated osmolality and determined osmolality should agree within 10 mOsm/kg. When the measured osmolality exceeds the calculated osmolality by more than 10 mOsm/kg, one of two circumstances prevails. First, the serum Na+ level may be spuriously low, as occurs with hyperlipidemia or hyperproteinemia (pseudohyponatremia). Second, osmolytes other than sodium salts, glucose, or urea may have accumulated in plasma. Examples are infused mannitol, radiocontrast media, or other solutes, including the alcohols, ethylene glycol, and acetone, which can increase the osmolality in plasma. For these examples, the difference between the osmolality calculated from equation 37 and the measured osmolality is proportional to the concentration of the unmeasured solute. Such differences in these clinical circumstances have been referred to as the osmolar gap. Ingestion of methanol (wood alcohol) causes metabolic acidosis in addition to severe optic nerve and central nervous system manifestations resulting from its metabolism to formic acid from formaldehyde. Therapy is generally similar to that for ethylene glycol intoxication, including general supportive measures, fomepizole administration, and usually hemodialysis. Rubbing alcohol poisoning is usually the result of accidental oral ingestion (adults) or absorption through the skin (infants and small children). Isopropyl alcohol is metabolized to acetone, and the osmolar gap increases as the result of accumulation of both acetone and isopropyl alcohol. Treatment is supportive, with attention to removal of unabsorbed alcohol from the gastrointestinal tract and administration of intravenous fluids. Although patients with significant isopropyl alcohol intoxication (blood levels of >100 mg/dL) may develop cardiovascular collapse and lactic acidosis, watchful waiting with a conservative approach (intravenous fluids, electrolyte replacement, and tracheal intubation) is often sufficient. It is a central nervous system depressant previously used as a sedative or anticonvulsant. The metabolic acidosis is a result of the accumulation of acetic acid, the metabolic product of the drug from acetaldehyde, and other organic acids. Pyroglutamic acid, or 5-oxoproline, is an intermediate in the -glutamyl cycle for the synthesis of glutathione. Acetaminophen ingestion can, in rare cases, deplete glutathione, which results in increased formation of -glutamyl cysteine, which is metabolized to pyroglutamic acid. It is conceivable that the heterozygote state for glutathione synthetase deficiency could predispose to pyroglutamic acidosis, because only a minority of critically ill patients receiving acetaminophen develop this newly appreciated form of metabolic acidosis. A prospective study of nine patients receiving high-dose lorazepam infusions90 showed elevated plasma propylene levels and an elevated osmolar gap. The acidosis is the result of accumulation of l-lactic acid, d-lactic acid, and l-acetaldehyde. The acidosis typically abates with cessation of the offending agent, and fomepizole administration is necessary only if the acidosis is severe. It is assumed that alkali replacement serves to prevent the harmful effects of prolonged positive H+ balance, especially progressive catabolism of muscle and loss of bone. Occasionally a patient may require long-term oral sodium polystyrene sulfonate (Kayexalate) therapy (15 to 30 g/day). The pure powder preparation is better tolerated long term than the commercially available premixed preparation and avoids sorbitol (which has been reported to cause bowel necrosis). Several newer and novel potassium binding agents for oral administration that are in advanced clinical trials and appear both more effective and much better tolerated that Kayexalate, offer considerable promise for safe and effective administration chronically to both reduce [K+] significantly and prevent hyperkalemia in susceptible patients. Metabolic alkalosis is one of the more common acid-base disturbances in hospitalized patients and is manifest as both a simple and a mixed acid-base disorder. The arterial pH establishes the diagnosis, because it is increased in metabolic alkalosis and is typically decreased in respiratory acidosis. Metabolic alkalosis is also frequently observed not as a pure or simple acid-base disturbance, but in association with other disorders such as respiratory acidosis, respiratory alkalosis, and metabolic acidosis (mixed disorders). Respiratory compensation for metabolic alkalosis is less predictable than that for metabolic acidosis. Further elevation in Pco2 is limited by hypoxemia and, to some extent, hypokalemia, which accompanies metabolic alkalosis with regularity. In assessing a patient with metabolic alkalosis, two questions must be considered: (1) What is the source of alkali gain (or acid loss) that generated the alkalosis Hypokalemia is an important participant in the maintenance phase of metabolic alkalosis and has selective effects on (1) H+ secretion and (2) ammonium excretion. The net result of the latter process is to stimulate K+ secretion through K+-selective channels in this same cell, which thus maintains the alkalosis. This combination of disorders evokes secondary hyperreninemic hyperaldosteronism and stimulates H+ secretion in the collecting duct. Hypokalemia independently stimulates ammoniagenesis and net acid excretion, thereby adding additional or "new" bicarbonate to the systemic circulation. Repair of the alkalosis in this case rests with removal of the excess autonomous mineralocorticoid and potassium repletion; saline administration is ineffective. For example, the presence of hypertension and hypokalemia in an alkalotic patient suggests that either the patient has some form of primary mineralocorticoid excess (see Table 17. Low plasma renin activity and normal urinary Na+ and Cl- values in a patient not taking diuretics would also indicate a primary mineralocorticoid excess syndrome. The combination of hypokalemia and alkalosis in a normotensive, nonedematous patient can pose a difficult diagnostic problem. Urine electrolyte determinations and urine screening for diuretics are helpful diagnostic tools Table 17. If the urine is alkaline, with high values for Na+ and K+ concentrations but low values for Cl- concentration, the diagnosis is usually either active (continuous) vomiting (overt or surreptitious) or alkali ingestion. On the one hand, if the urine is relatively acid, with low concentrations of Na+, K+, and Cl-, the most likely possibilities are prior (discontinuous) vomiting, a posthypercapnic state, or prior diuretic ingestion. The use of trisodium citrate solution for regional anticoagulation has been reported to be a cause of metabolic alkalosis in patients receiving continuous renal replacement therapy. Milk-Alkali Syndrome Another cause of metabolic alkalosis is long-standing excessive ingestion of milk and antacids. The incidence of milkalkali syndrome is now increasing because of the use of calcium supplementation. In Asia, betel nut chewing is a cause because the erosive nut is often wrapped in calcium hydroxide. Patients with these disorders are prone to developing nephrocalcinosis, renal insufficiency, and metabolic alkalosis. The parallel Na+-H+-exchanger remains functional, which allows Na+ to be reabsorbed and H+ to be secreted. The use of proton pump inhibitors has been advanced as a means of reducing chloride secretion by the parietal cells and thus reducing the diarrhea. K+ and volume depletion likely cause the alkalosis, because colonic secretion is alkaline. Increased H+ loss through gastric secretions can be caused by vomiting due to physical or psychiatric reasons, nasogastric tube aspiration, or a gastric fistula (see Table 17. The excess sodium bicarbonate enters the distal tubule, where, under the influence of the increased level of aldosterone, K+ and H+ secretion is stimulated. Diuretics, by blocking Cl- reabsorption in the distal tubule or by increasing H+ pump activity, may also stimulate distal H+ secretion and increase net acid excretion. The accompanying cation is predominantly K+, especially if dietary potassium is not limited. Secondary hyperaldosteronism in states of chronic hypercapnia may be responsible for this pattern of response. Enhanced proximal acidification as a result of conditioning induced by the previous hypercapnic state may also contribute to the maintenance of the posthypercapnic alkalosis. Barttin appears to be necessary for the function of the voltage-gated chloride channel. Secondary overproduction of prostaglandins, juxtaglomerular apparatus hypertrophy, and vascular pressor unresponsiveness then ensue. The finding of a low urinary Cl- concentration is helpful in identifying the vomiting patient. Bartter-like manifestations have been reported in sporadic cases associated with chronic intermittent diuretic and laxative abuse, cystic fibrosis, and congenital chloride diarrhea. Salt craving seems to be a near universal feature and aggravates renal K+ wasting. Discouraging excessive dietary salt intake requires dietary counseling and may be a challenging component of management. Salt intake for sufficient distal Na+ delivery is also a prerequisite for the development of both the hypokalemia and the alkalosis. Increased mineralocorticoid hormone levels may be the result of autonomous primary adrenal overproduction of mineralocorticoid or of secondary aldosterone release by primary renal overproduction of renin. High Renin Levels States accompanied by inappropriately high renin levels may be associated with hyperaldosteronism and alkalosis. Renin levels are elevated because of primary elaboration of renin or, secondarily, by diminished effective circulating blood volume. Examples of high-renin hypertension include renovascular, accelerated, and malignant hypertension. Primary tumor overproduction of renin is another rare cause of hyperreninemic hyperaldosteronism­induced metabolic alkalosis. Potassium Ion Depletion In some disorders, primary adrenal overproduction of mineralocorticoid suppresses renin elaboration. Hypertension occurs as the result of mineralocorticoid excess with volume overexpansion. Tumor involvement (adenoma or, rarely, carcinoma) or hyperplasia of the adrenal gland is associated with aldosterone overproduction. The kaliuresis persists and causes continued K+ depletion with polydipsia, inability to concentrate the urine, and polyuria. Increased aldosterone levels may be the result of autonomous primary adrenal overproduction or of secondary aldosterone release due to renal overproduction of renin. Glucocorticoid-remediable hyperaldosteronism is an autosomal dominant form of hypertension, the features of which resemble those of primary aldosteronism (hypokalemic metabolic alkalosis and volume-dependent hypertension). In this disorder, however, glucocorticoid administration corrects the hypertension as well as the excessive excretion of 18-hydroxysteroid in the urine. Dluhy and associates have demonstrated that this disorder results from unequal Pure K+ depletion causes metabolic alkalosis, although generally of only modest severity. One reason that the alkalosis is usually mild is that K+ depletion also causes positive sodium chloride balance with or without mineralocorticoid administration. When access to salt as well as to K+ is restricted, more severe alkalosis develops. The pathophysiologic basis of the alkalosis has not been well defined in humans, but the alkalosis associated with severe K+ depletion is resistant to salt administration. Although a rare cause of primary aldosteronism, the syndrome is important to distinguish because treatment differs and it can be associated with severe hypertension, stroke, and accelerated hypertension during pregnancy. Abnormally high glucocorticoid production caused by adrenal adenoma or carcinoma or ectopic corticotropin production causes metabolic alkalosis. The alkalosis may be ascribed to coexisting mineralocorticoid (deoxycorticosterone and corticosterone) hypersecretion. These features resemble those of primary hyperaldosteronism, but the renin and aldosterone levels are suppressed (pseudohyperaldosteronism). Liddle originally described patients with low renin and low aldosterone levels that did not respond to spironolactone. Either mutation results in deletion of the cytoplasmic tails of the - or -subunit. Ingestion of licorice, carbenoxolone, smokeless tobacco, or nasal spray can cause a typical pattern of hypermineralocorticoidism. These substances inhibit 11-hydroxysteroid dehydrogenase (which normally metabolizes cortisol to an inactive metabolite), so that cortisol is allowed to occupy type I renal mineralocorticoid receptors, mimicking aldosterone.

The most common type of tracheoesophageal fistula connects the trachea to the inferior part of the esophagus blood pressure chart for male and female purchase carvedilol 12.5 mg without prescription. This birth defect is associated with atresia of the esophagus superior to the fistula pulse pressure 86 purchase carvedilol in india. A tracheoesophageal fistula results from incomplete division of the foregut by the tracheoesophageal septum into the esophagus and trachea cuff pressure pulse pressure korotkoff sound order carvedilol 6.25 mg on line. In most types of tracheoesophageal fistula pulse pressure ratio buy carvedilol 6.25 mg with mastercard, air passes from the trachea through the tracheoesophageal fistula into the esophagus and stomach blood pressure jumps around carvedilol 25 mg lowest price. Pneumonitis (pneumonia) resulting from the aspiration of oral and nasal secretions into the lungs is a serious complication of this birth defect. Giving the baby water or food by mouth is obviously contraindicated in such cases. Inability to pass a catheter through the esophagus into the stomach indicates esophageal atresia. Because this birth defect is commonly associated with tracheoesophageal fistula, the pediatrician would suspect this defect. The presence of this defect would be confirmed by imaging the nasogastric tube arrested in the proximal esophageal pouch. When a certain type of tracheoesophageal fistula is present, there would also be air in the stomach that passed to it from a connection between the esophagus and the trachea. A combined radiographic, endoscopic, and surgical approach would usually be used to detect and remove a tracheoesophageal fistula. Complete absence of a lumen (duodenal atresia) may involve the second (descending) and third (horizontal) parts of the duodenum. The obstruction usually results from incomplete vacuolization of the lumen of the duodenum during the eighth week. The obstruction causes distention of the stomach and proximal duodenum because the fetus swallows amniotic fluid. Duodenal atresia is common in infants with Down syndrome, as are other severe birth defects such as annular pancreas, cardiovascular abnormalities, malrotation of the midgut, and anorectal anomalies. Polyhydramnios occurs because the duodenal atresia prevents normal absorption of amniotic fluid from the fetal intestine distal to the obstruction. The omphaloenteric duct normally undergoes complete involution by the 10th week of development, at which time the intestines return to the abdomen. In 2% to 4% of people, a remnant of the duct persists as an ileal diverticulum (Meckel diverticulum); however, only a small number of these defects ever become symptomatic. This defect is rare, and its external opening may be confused with a granuloma (inflammatory lesion) of the stump of the umbilical cord. The defect, imperforate anus with a rectovaginal fistula, results from failure of the urorectal septum to form a complete separation of the anterior and posterior parts of the urogenital sinus. Because the inferior one third of the vagina forms from the anterior part of the urogenital sinus, it joins the rectum, which forms from the posterior part of the sinus. A small omphalocele, like the one described here, is sometimes erroneously called an umbilical cord hernia; however, it should not be confused with an umbilical hernia that occurs after birth and is covered by skin. The thin membrane covering the mass in the present case would be composed of peritoneum and amnion. Omphalocele occurs when the intestinal loops fail to return to the abdominal cavity from the umbilical cord during the 10th week. In the present case, because the hernia is relatively small, the intestine may have entered the abdominal cavity and then herniated later when the rectus muscles did not approach each other close enough to occlude the circular defect in the anterior abdominal wall. Congenital atresia of the small intestine involves the ileum most frequently; the next most frequently affected region is the duodenum. Some meconium (fetal feces) is formed from exfoliated fetal epithelium and mucus in the intestinal lumen. During surgery, the atretic ileum would probably appear as a narrow segment connecting the proximal and distal segments of the intestine. The ileal atresia could have resulted from failure of recanalization of the lumen; however, more likely the atresia occurred because of a prenatal interruption of the blood supply to the ileum. Sometimes a loop of small bowel becomes twisted, interrupting its blood supply and causing necrosis of the affected segment. The atretic section of bowel usually becomes a fibrous cord connecting the proximal and distal segments of bowel. Because this part of the urogenital sinus gives rise to the urethra and epithelium of the vagina, the ectopic (abnormally placed) ureteric orifice may be located in either of these structures, which accounts for the continual dribbling of urine into the vagina. An ectopic ureteral orifice that opens inferior to the bladder results in urinary incontinence because there is no urinary bladder or urethral sphincter between it and the exterior. Normally, the oblique passage of the ureter through the wall of the bladder allows the contraction of the bladder musculature to act like a sphincter for the ureter, controlling the flow of urine from it. Approximately 25% of kidneys receive two or more branches directly from the aorta; however, more than two is an exceptional finding. Supernumerary arteries enter either through the renal sinus or at the poles of the kidney, usually the inferior pole. Accessory renal arteries, more common on the left side, represent persistent fetal renal arteries that grow out in sequence from the aorta as the kidneys "ascend" from the pelvis to the abdomen. The presence of a supernumerary artery is of clinical importance in other circumstances because it may cross the ureteropelvic junction and hinder urine outflow, leading to dilation of the calices and pelvis on the same side (hydronephrosis). Hydronephrotic kidneys frequently become infected (pyelonephritis); infection may lead to destruction of the kidneys. Rudimentary horn pregnancies are very rare; however, they are clinically important because it is difficult to distinguish between this type of pregnancy and a tubal pregnancy. In the present case, the uterine defect was the result of retarded growth of the right paramesonephric duct and incomplete fusion of this duct with its partner during development of the uterus. Most defects resulting from incomplete fusion of the paramesonephric ducts do not cause clinical problems; however, a rudimentary horn that does not communicate with the main part of the uterus may cause pain during the menstrual period because of distention of the horn by blood. Because most rudimentary uterine horns are thicker than uterine tubes, a rudimentary horn pregnancy is likely to rupture much later than a tubal pregnancy. Hypospadias of the glans penis is the term applied to a defect in which the urethral orifice is on the ventral surface of the penis near the glans penis. Double renal pelves and ureters result from the formation of two ureteric buds on one side of the embryo. Occasionally, the extra ureter opens into the urogenital tract inferior to the bladder. Hypospadias may be associated with an inadequate production of androgens by the fetal testes, or there may be resistance to the hormones at the cellular level in the urogenital folds. Hypospadias is thought to have a multifactorial etiologic basis because close relatives of patients with hypospadias are more likely to have the defect than the general population. Glanular hypospadias, a common defect of the urogenital tract, occurs in approximately 1 in every 300 male infants. Failure of masculinization to occur in these individuals results from a resistance to the action of testosterone at the cellular level in genitalia. The embryologic basis of indirect inguinal hernia is persistence of the processus vaginalis, a fetal outpouching of peritoneum. This finger-like pouch evaginates the anterior abdominal wall and forms the inguinal canal. A persistent processus vaginalis predisposes to indirect inguinal hernia by creating a weakness in the anterior abdominal wall and a hernial sac into which abdominal contents may herniate if the intra-abdominal pressure becomes very high (as occurs during straining). The hernial sac would be covered by internal spermatic fascia, cremaster muscle, and cremasteric fascia. Cardiac catheterization and ultrasonography would probably be performed to confirm the diagnosis of transposition of the great arteries. If this defect is present, a bolus (large quantity) of contrast material injected into the right ventricle would enter the aorta, whereas contrast material injected into the left ventricle would enter the pulmonary circulation. The infant was able to survive after birth because the ductus arteriosus remains open in these infants, allowing some mixing of blood between the two circulations. In other cases, there is also an atrial septal defect or ventricular septal defect that permits intermixing of blood. Complete transposition of the great arteries is incompatible with life if there are no associated septal defects or a patent ductus arteriosus. It would be located in the region of the oval fossa because this is the most common type of clinically significant atrial septal defect. Large defects, as in the present case, often extend toward the inferior vena cava. The pulmonary artery and its major branches are dilated because of the increased blood flow through the lungs and the increased pressure within the pulmonary circulation. In these cases, a considerable shunt of oxygenated blood flows from the left atrium to the right atrium. This blood, along with the normal venous return to the right atrium, enters the right ventricle and is pumped to the lungs. Large atrial septal defects may be tolerated for a long time, as in the present case, but progressive dilation of the right ventricle often leads to heart failure. Most patients with a large ventricular septal defect have a massive left-toright shunt of blood, which causes cyanosis and congestive heart failure. Patent ductus arteriosus is the most common cardiovascular defect associated with maternal rubella infection during early pregnancy. When the ductus arteriosus is patent in an infant, aortic blood is shunted into the pulmonary artery. One half to two thirds of the left ventricular output may be shunted through the patent ductus arteriosus. The tetrad of cardiac defects present in tetralogy of Fallot is pulmonary stenosis, ventricular septal defect, overriding aorta, and right ventricular hypertrophy. Angiocardiography or ultrasonography might be used to reveal the malpositioned aorta (straddling the ventricular septal defect) and the degree of pulmonary stenosis. Cyanosis occurs because of the shunting of unsaturated blood; however, it may not be present at birth. The main aim of therapy is to improve the oxygenation of the blood in the infant, usually by surgical correction of the pulmonary stenosis and closure of the ventricular septal defect. This defect of the vertebral arch of the first sacral or last lumbar vertebra, or both, occurs in approximately 10% of people. The spinal cord and nerves are usually normal, and neurologic symptoms are usually absent. A rib associated with the seventh cervical vertebra is clinically important because it may compress the subclavian artery or brachial plexus, or both, producing symptoms of artery and nerve compression. These ribs develop from the costal processes of the seventh cervical vertebra and may fuse with the first rib, resulting in compressive symptoms, as in this patient. A hemivertebra can produce a lateral curvature of the vertebral column (scoliosis). This birth defect of the vertebral column is composed of one half of a body, a pedicle, and a lamina. This defect results when the mesenchymal cells from the sclerotomes on one side fail to form the primordium of one half of a vertebra. Craniosynostosis indicates premature closure of one or more of the cranial sutures. Scaphocephaly, a long narrow cranium, results from premature closure of the sagittal suture. The features of Klippel-Feil syndrome are short neck, low hairline, restricted neck movements, fusion of one or more cervical motion segments, and abnormalities of the brainstem and cerebellum. The number of female infants with dislocation of the hip is approximately eight times that of male infants. The hip joint is not usually dislocated at birth; however, the acetabulum is underdeveloped. Dislocation of the hip joint may not become obvious until the infant attempts to stand at approximately 12 months after birth. This condition is probably caused by deforming forces acting directly on the hip joint of the fetus. Severe birth defects of the limbs (amelia and meromelia), similar to those produced by thalidomide, are rare and usually have a genetic basis. The thalidomide syndrome consists of absence of limbs (amelia); gross defects of the limbs (meromelia), such as attachment of the hands and feet to the trunk by small, irregularly shaped bones; intestinal atresia; and cardiac defects. The most common type of clubfoot is talipes equinovarus, which occurs in approximately 1 of every 1000 neonates. In this deformation, the soles of the feet are turned medially and the feet are sharply plantar flexed. The feet are fixed in the tiptoe position, resembling the foot of a horse (Latin equus, horse). It varies from cutaneous webbing of the digits to synostosis (union of phalanges). This defect occurs when separate digital rays fail to form in the fifth week of gestation or the webbing between the developing digits fails to break down between the sixth and eighth weeks. Absence of the sternocostal portion of the left pectoralis major muscle is the cause of the abnormal surface features observed. The costal heads of the pectoralis major and pectoralis minor muscles are usually present. Despite its numerous and important actions, absence of all or part of the pectoralis major muscle usually causes no disability; however, the defect caused by absence of the anterior axillary fold is striking, as is the inferior location of the nipple. The actions of other muscles associated with the shoulder joint compensate for the absence of part of the pectoralis major. The short, contracted right sternocleidomastoid muscle tethers the right mastoid process to the right clavicle and sternum, and continued growth of the left side of the neck results in tilting and rotation of the head. Congenital torticollis (wry neck) is a relatively common condition that may occur because of injury to the muscle during birth. Absence of striated musculature in the median plane of the anterior abdominal wall of the embryo is associated with exstrophy of the urinary bladder.

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