Jaime M. Monti, MD

• Department of Pharmacology and Therapeutics,
• Clinics Hospital, University of the Republic School
• of Medicine, Montevideo, Uruguay

The overall frequency of chromosome abnormalities in sporadic miscarriages is at least 50% bacteria names and pictures buy tetracycline with a mastercard. No evidence of recurrent aneuploidy was found; as in the general reproductive population treatment for sinus infection in toddlers order genuine tetracycline on line, the risk of trisomy increased with advancing maternal age antibiotic resistance experts purchase 500 mg tetracycline with visa. Most miscarriage aneuploidy is thought to be a result of maternal meiotic nondisjunction during oocyte development antibiotic resistance nature order tetracycline 500 mg on line, although aneuploidy less frequently is of sperm origin antibiotic 5 day pack buy tetracycline with paypal, especially in couples with male factor infertility. There is significant debate among reproductive endocrinologists as to how often aneuploidy is causative in women with recurrent pregnancy loss. Certain deletions and duplications in which a critical area of a chromosome is significantly altered may certainly lead to significant medical disorders or arrest of a developing embryo. Preimplantation genetic testing Genetic causes of individual miscarriages may be grouped into abnormalities that are inherited from a partner with a balanced translocation or inversion, or, more commonly, numeric chromosome errors, which unfortunately increase with advancing maternal age. Preimplantation genetic testing is a technology that is designed to reduce these occurrences of inherited and sporadic genetic abnormalities. Preimplantation genetic testing is accomplished by performing an in vitro fertilization cycle, removing a cell, or cells, from the resultant embryos or oocytes, evaluating the cell(s) for genetic abnormalities, and using the results to determine which embryos are ideal for uterine transfer. Embryo mosaicisim, the presence of more than one cell line within the same embryo, has been shown to be as high as 50% in cleavage stage embryos and as high as 10% in blastocysts. It is vital that providers explain to patients contemplating utilizing preimplantation genetic testing the risks, benefits, and evidence-based alternatives. Adverse effects of chronic low dose radiation on reproduction have not been identified in humans. It is important that health care providers counseling patients about exposures to substances in the environment have current and accurate information in order to respond to these concerns. Cigarette smoking Cigarette smoking reduces fertility and increases the rate of spontaneous miscarriage. The data evaluating smoking and miscarriage are extensive and involve approximately 100,000 subjects. The studies suggest a clinically significant detrimental effect of cigarette smoking that is dose dependent, with a relative risk for miscarriage among moderate smokers (10­20 cigarettes a day) being 1. Alcohol consumption Alcohol consumption is associated with a risk of spontaneous miscarriage. Couples should be counseled concerning these habits and strongly encouraged to discontinue these prior to attempting subsequent conception. However, many studies have linked obesity to a generalized increase in systemic inflammatory responses. Given the good outcome for most couples with unexplained recurrent miscarriage in the absence of treatment, it is difficult to recommend unproven therapies, especially if they are invasive and expensive. Explanation and appropriate emotional support are possibly the two most important aspects of therapy. If no cause can be found, the majority of couples will eventually have a successful pregnancy outcome with supportive therapy alone. Early sonography should be scheduled and any encouraging results should be communicated to the couple. When aneuploidy is found, this can be reassuring to both the physician and patient that this loss was not due to a treatment failure or any patient activity. Diagnostic factors identified in 1020 women with two versus three or more recurrent pregnancy losses. Prognosis for live birth in women with recurrent miscarriage: what is the best measure of success Practice Committee of the American Society for Reproductive Medicine Aging and infertility in women. Costeffectiveness of cytogenetic evaluation of products of conception in the patient with a second pregnancy loss. A decision analysis of selective versus universal recurrent pregnancy loss evaluation. Effect of prior birth and miscarriage frequency on the prevalence of acquired and congenital uterine anomalies in women with recurrent miscarriage: a cross-sectional study. Uterine leiomyomas reduce the efficacy of assisted reproduction cycles: results of a matched follow-up study. Minimally invasive surgical options for congenital and acquired uterine factors associated with recurrent pregnancy loss. The late luteal phase in infertile women: comparison of simultaneous endometrial biopsy and progesterone levels. Comparison of serum progesterone and endometrial biopsy for confirmation of ovulation and evaluation of luteal function. A meta-analysis of randomized control trials of progestational agents in pregnancy. Increased prevalence of antithyroid antibodies identified in women with recurrent pregnancy loss but not in women undergoing assisted reproduction. Management of thyroid dysfunction during pregnancy and postpartum: an Endocrine Society clinical practice guideline. Impact of subclinical hypothyroidism in women with recurrent early pregnancy loss. Correction of hyperinsulinemia in oligoovulatory women with clomiphene-resistant polycystic ovary syndrome: a review of therapeutic rationale and reproductive outcomes. Incidence of spontaneous abortion among normal women and insulin-dependent diabetic women whose pregnancies were identified within 21 days of conception. Hyperprolactinemic recurrent spontaneous pregnancy loss: a true clinical entity or a spurious finding Hyperprolactinemic recurrent miscarriage and results of randomized bromocriptine treatment trials. Immunology of multiple endocrinopathies associated with premature ovarian failure. Association of anticardiolipin antibodies and pregnancy loss in women with systemic lupus erythematosus. A prospective, controlled multicenter study on the obstetric risks of pregnant women with antiphospholipid antibodies. Aspirin and heparin effect on basal and antiphospholipid antibody modulation of trophoblast function. Heparin and low-dose aspirin restore placental human chorionic gonadotrophin secretion abolished by antiphospholipid antibodycontaining sera. Recurrent pregnancy loss with antiphospholipid antibody: a systematic review of therapeutic trials. Antiphospholipid antibody-associated recurrent pregnancy loss: treatment with heparin and low-dose aspirin is superior to low-dose aspirin alone. Does aspirin have a role in improving pregnancy outcome for women with the antiphospholipid syndrome Heparin treatment in antiphospholipid syndrome with recurrent pregnancy loss: a systematic review and meta-analysis. Prevention of recurrent spontaneous abortion by intravenous immunoglobulin: a double-blind placebo-controlled study. Intravenous immunoglobulin and idiopathic secondary recurrent miscarriage: a multicentered randomized placebocontrolled trial. Prednisone and aspirin in women with autoantibodies and unexplained recurrent fetal loss. Infectious agents in tissues from spontaneous abortions in the first trimester of pregnancy. Chronic endometritis in women with recurrent early pregnancy loss and/or fetal demise. Lockwood C, Wendel G, Committee on Practice Bulletins Obstetrics Practice bulletin no. Inherited thrombophilias and adverse pregnancy outcomes: a review of screening patterns and recommendations. A collaborative study of the segregation of inherited chromosome structural rearrangements in 1356 prenatal diagnoses. The paternal effect of chromosome translocation carriers observed from meiotic segregation in embryos. Chromosome abnormalities investigated by non-invasive prenatal testing account for approximately 50% of fetal unbalances associated with relevant clinical phenotypes. Characteristics of chromosomal abnormalities diagnosed after spontaneous abortions in an infertile population. Aneuploidy rates in failed pregnancies following assisted reproductive technology. Comparison of ultrasonographic findings in spontaneous abortions with normal and abnormal karyotypes. Cytogenetic analysis of miscarriages from couples with recurrent miscarriage: a case-control study. Embryoscopic and cytogenetic analysis of 233 missed abortions: factors involved in the pathogenesis of developmental defects of early failed pregnancies. Practice Committee of Society for Assisted Reproductive Technologies, Practice Committee of American Society for Reproductive Medicine. Single embryo transfer with comprehensive chromosome screening results in improved ongoing pregnancy rates and decreased miscarriage rates. Clinical application of comprehensive chromosomal screening at the blastocyst stage. Aneuploid blastomeres may undergo a process of genetic normalization resulting in euploid blastocysts. Alcohol, smoking, and incidence of spontaneous abortions in the first and second trimester. Perinatal loss and neurological abnormalities among children of the atomic bomb: Nagasaki and Hiroshima revisited, 1949 to 1989. A longitudinal study of pregnancy outcome following idiopathic recurrent miscarriage. Predictive value of the presence of an embryonic heartbeat for live birth: comparison of women with and without recurrent pregnancy loss. Recurrent pregnancy loss evaluation combined with 24-chromosome microarray of miscarriage tissue provides a probable or definite cause of pregnancy loss in over 90% of patients. As detailed in Chapter 11, the advent of minimally invasive surgical technological innovation has provided clinicians with a plethora of options for management. Hysteroscopy is not only a means for assessment of the uterine cavity; it is also the method of access for reconstructive surgical intervention. Indications for concurrent laparoscopy are variable and need to be considered on a case-by-case basis with knowledge that intraoperative sonographic monitoring is often at least as efficacious and, in most instances, readily available to the reproductive surgeon. Examination of both the vagina and rectum allows for assessment of the caudal aspect of the 433 434 Surgery for congenital anomalies septum and for the presence of hematocolpos, should it exist, cephalad to the obstruction. Ideally, we recommend performing resection surgery at the time of puberty to allow for improved healing of the vaginal epithelium in the presence of physiological levels of systemic estrogen. Following menarche, complete transverse septa are typically associated with distension of the upper vagina in the form of a hematocolpos, a circumstance that facilitates the surgical resection. The overall strategy for thin septa is resection with vaginal epithelial reapproximation. Another approach when there exists a thickened transverse septum or partial atresia of the vault is the modified Z-plasty technique described by Grünberger. This procedure also minimizes the risk of vaginal stenosis by postoperatively employing the use of a rigid plastic vaginal mold with concurrent use of estrogen cream. In such instances, simultaneous laparoscopy should be considered to manage the resulting adhesive disease. Relief of the outflow tract obstruction frequently results in complete reversal of even extensive endometriosis. The procedure should be preceded by catheterization of the bladder with a Foley catheter. The surgeon must remain cognizant of both the bladder and the rectum during the resection. For thick transverse septa, the process is started by placing a large bore spinal needle through the septum to confirm and orient the presence and location of the hematocolpos with the aspiration of old, thickened blood. This incision should be created with extreme care, avoiding posterior or anterior deviation toward the rectum or urethra. With such electrodes, a setting of 25­35 watts "cutting" current is generally effective for septum dissection. In cases of thin septa, resection should be done as widely as possible to reduce postoperative vaginal stenosis. Upon completion of the resection, it is important to perform a careful rectal examination to detect otherwise occult injury. It is important to establish continuity of the vaginal epithelium across the area of resection. With thicker vaginal septa, if there is a significant gap, the vaginal epithelium can be addressed with the Z-plasty technique, which is performed to add length to the vagina and minimize the risk of vaginal stenosis. Where Z-plasty is not feasible, a split-thickness skin graft may be required with postoperative placement of a vaginal stent. The role for a postoperative acrylic vaginal stent when a skin graft is not used is controversial; there is no available quality evidence to provide guidance. Consequently, the use of a stent should be determined by the surgeon on a case-bycase basis if there is concern for contraction of the newly created space. The vaginal stent can be placed either routinely each evening at bedtime or, at least, several times per week. This technique can be considered if the transverse vaginal Müllerian anomalies affecting the uterus 435 septum is difficult to appreciate and there is no hematocolpos to allow for bulging of the septum.

Only preliminary results are available currently and suggest that clinical outcomes will be favorable with a high tolerability for office use infection hair follicle purchase tetracycline 250 mg. The system includes a dedicated controller and a single use 6 mm outside diameter probe with a unique gold mesh that is configured into two pairs of electrodes on an expandable frame located at the distal end bacteria horizontal gene transfer buy generic tetracycline on-line. Following transcervical insertion of the device antibiotic resistance ethics discount tetracycline 500 mg otc, the mesh electrodes are deployed by retraction of the outer sleeve to form a triangular shape that conforms to the surface of a normal endometrial cavity antibiotics for pcos acne order online tetracycline. Another feature of the system is the application of suction to the endometrial cavity bacteria classification generic tetracycline 250 mg, a process that is initiated during the process of endometrial vaporization and desiccation. The probe itself is attached to the dedicated controller unit that functions to perform the uterine integrity test, electrify the bipolar mesh, apply suction, and monitor local tissue impedance. Following insertion of the device into the endometrial cavity, the surgeon measures the intercornual distance with the probe, and this, combined with the sounded uterine length, allows the controller unit to calculate the amount of power required for the specific uterus. The system allows for electrosurgical vaporization and underlying desiccation in a relatively rapid fashion (approximately 80­90 seconds). The depth of this vaporization and desiccation varies- less in the cornual areas and more in the fundus and body-and is controlled by the increasing tissue impedance of the adjacent desiccated tissue, shutting the system off when it exceeds 50 ohms. Suction evacuation maintains contact of the electrode surface with the endometrium and evacuation of the vapor that could impede such contact. To allow proper function of the system, it appears that the endometrial cavity must be symmetrical and of relatively normal size, between six and ten centimeters of sounded uterine length, although successful outcomes have been reported with uteri with sounded length up to 12 cm. The NovaSure device has been subjected to a number of prospective observational studies. The amenorrhea rates at one year were 41% for NovaSure and 35% for endometrial resection. Of these, seven had subsequent uterine surgery, one an endometrial ablation, and the other six a hysterectomy for a repeat surgery rate of about 8%. In a study of 1,178 women from the Mayo Clinic in Rochester Minnesota, aged less than 40, failure was more common with the baseline presence of dysmenorrhea, a prior tubal ligation, identified adenomyosis, and a large cavity-defined as a sounded uterine length of >10. The system comprises a proprietary controller unit, and a single use deployable ablation device that requires the cervix to be dilated to 7 mm for access. Rather than a gold mesh, the arms of the device expand to deploy a silicon balloon that is inflated with argon gas, which, when stimulated by activated internal and external electrodes, forms an electrified and heated "plasma" that, in turn, heats the endometrium through the membrane. Although recently approved in the United States, there are enough data to provide some insight on the performance of the Minerva system. Study "success," defined as with alkaline-hematin based menstrual volumes less than 80 mL, was experienced by 93. The hysterectomy rate in the first year was 2% in the Minerva group, and 6% in those treated with resectoscopic electrodesiccation; there were no major complications in either arm of the study. Microwave endometrial ablation Microwave endometrial ablation is a successful technique approved in the United States and elsewhere, but following acquisition of the company by Hologic, the maker of the NovaSure device, it was withdrawn from the market in 2010. When and if identified, the endometrium is resected, desiccated, or vaporized, taking care to avoid perforation or even electrodesiccation near to the serosa, as, in such instances, bowel will likely be adjacent and vulnerable to injury. There are two systematic reviews that included meta-analysis of randomized trials that compare one device or technique with another. In addition, the investigators noted a generator problem with the bipolar device that was discovered after 44 subjects had been treated. The generator was replaced and, to the credit of the investigators, outcomes were reported based upon the entire treatment cohort (an intent to treat analysis), as well as by including only the patients who were randomized following replacement of the generator. If the patients treated prior to changing the generator were excluded, this number rose to 56% that is slightly better than the results in the other randomized trials previously discussed. Amenorrhea was reported by 73% of the 69 bipolar cases and 66% of those 35 treated with balloon ablation. The risk of a subsequent intervention was equivalent between the groups and patient satisfaction was also equal. The repeat surgical intervention rate, generally for failed therapy, was about 6% in each group. Quality of life scores were not quite as high in the levonorgestrel group in some sections of the assessment, but similar in most. Available evidence suggests that these ablative procedures significantly reduce menstrual blood flow, usually decrease related dysmenorrhea, and are associated with a relatively high level of satisfaction even with long-term follow-up. The discussion of hysteroscopic techniques in this chapter has generally reviewed studies that reflect the results obtained by experts under controlled conditions (efficacy) and should not be interpreted to reflect clinical and cost outcomes when the procedures are deployed outside the constraints of a clinical trial (effectiveness). In addition, largely because of the removal of the specter of fluid overload, they may be performed in a less resource-intense surgical environment, thereby reducing at least the direct costs of the procedure. Endometrial ablation in women with abnormal uterine bleeding related to ovulatory dysfunction: a cohort study. Elektrokoagulation der Uteru sschleimhaut zur Behandlungklimakterischer Blut ungen. Randomised trial comparing hysterectomy and transcervical endometrial resection: effect on health related quality of life and costs two years after surgery. A randomised trial comparing endometrial resection and abdominal hysterectomy for the treatment of menorrhagia. Randomised trial of hysterectomy, endometrial laser ablation, and transcervical endometrial resection for dysfunctional uterine bleeding. Medical Research Council randomised trial of endometrial resection versus hysterectomy in management of menorrhagia. Endometrial resection versus vaginal hysterectomy for menorrhagia: longterm clinical and quality-of-life outcomes. Endometrial resection and ablation versus hysterectomy for heavy menstrual bleeding. Hysterectomy compared with endometrial ablation for dysfunctional uterine bleeding: A randomized controlled trial. A Practical Manual of Hysteroscopy and Endometrial Ablation Techniques: A Clinical Cookbook. Pre-operative endometrial thinning agents before endometrial destruction for heavy menstrual bleeding. A cost effectiveness analysis of goserelin compared with danazol as endometrial thinning agents. Intrauterine surgery using a new coaxial bipolar electrode in normal saline solution (Versapoint): a pilot study. Biological effects of distension media in bipolar versus monopolar resectoscopic myomectomy: a randomized trial. Efficacy of vaginal misoprostol before hysteroscopy for cervical priming in patients who have undergone cesarean section and no vaginal deliveries. Laminaria tent vs misoprostol for cervical priming before hysteroscopy: randomized study. The effect of dilute vasopressin solution on the force needed for cervical dilatation: a randomized controlled trial. Effects of power and electrical current density variations in an in vitro endometrial ablation model. Uterine surface temperature changes caused by electrosurgical endometrial coagulation. Modified endometrial ablation: electrocoagulation with vasopressin and suction curettage preparation. Short and medium term outcomes after rollerball endometrial ablation for menorrhagia. Hysteroscopic management of intrauterine lesions and intractable uterine bleeding. Hysteroscopic endomyometrial resection: a new technique for the treatment of menorrhagia. Randomized comparison of vaporizing electrode and cutting loop for endometrial ablation. Genital tract electrical burns during hysteroscopic endometrial ablation: report of 13 cases in the United States and Canada. The cost-effectiveness of preferencebased treatment allocation: the case of hysterectomy versus endometrial resection in the treatment of menorrhagia. A randomised trial of endometrial ablation versus hysterectomy for the treatment of dysfunctional uterine bleeding: outcome at four years. Does transcervical resection of the endometrium for menorrhagia really avoid hysterectomy The effect of increasing age on the outcome of hysteroscopic endometrial resection for management of dysfunctional uterine bleeding. Depth of endometrial penetration in adenomyosis helps determine outcome of rollerball ablation. Hysteroscopic endometrial ablation is an effective alternative to hysterectomy in women with menorrhagia and large uteri. Partial rollerball endometrial ablation: a modification of total ablation to treat menorrhagia without causing complications from intrauterine adhesions. Endometrial carcinoma after endometrial ablation: high-risk factors predicting its occurrence. Long-term followup after endometrial ablation in Finland: cancer risks and later hysterectomies. Hysterectomy, endometrial destruction, and levonorgestrel releasing intrauterine system (Mirena) for heavy menstrual bleeding: systematic review and meta-analysis of data from individual patients. Outcome of the first 220 cases of endometrial balloon ablation using Cavaterm plus. Long-term results in the treatment of menorrhagia and hypermenorrhea with a thermal balloon endometrial ablation technique. Prospective observational study of Thermablate Endometrial Ablation System as an outpatient procedure. Two-year results of a new two-minute hot liquid balloon endometrial ablation system (Thermablate): a pilot study. Effectiveness and outcomes of thermablate endometrial ablation system in women with heavy menstrual bleeding. Bipolar versus balloon endometrial ablation in the office: a randomized controlled trial. A multicenter evaluation of endometrial ablation by Hydro ThermAblator and rollerball for treatment of menorrhagia. Evaluation of HydroThermAblator and rollerball endometrial ablation for menorrhagia 3 Years after treatment. Complications following extended freeze endometrial cryoablation in uteri with previous uterine incisions: a case report. A randomized study comparing endometrial cryoablation and rollerball electroablation for treatment of dysfunctional uterine bleeding. Durability of treatment effects after endometrial cryoablation versus rollerball electroablation for abnormal uterine bleeding: two-year results of a multicenter randomized trial. Evaluation of the NovaSure endometrial ablation procedure in women with uterine cavity length over 10 cm. NovaSure impedance controlled system for endometrial ablation: three-year follow-up on 107 patients. Assessment and comparison of intraoperative and postoperative pain associated with NovaSure and ThermaChoice endometrial ablation systems. NovaSure endometrial ablation under local anaesthesia in an outpatient setting: an observational study. An impedance-controlled system for endometrial ablation: five-year follow-up of 107 patients. A randomized, multicenter trial of safety and efficacy of the NovaSure system in the treatment of menorrhagia. Randomised controlled trial of bipolar radio-frequency endometrial ablation and balloon endometrial ablation. Intraoperative predictors of long-term outcomes after radiofrequency endometrial ablation. Effect of undiagnosed deep adenomyosis after failed NovaSure endometrial ablation. One-year follow-up results of a multicenter, single-arm, objective performance criteria-controlled international clinical study of the safety and efficacy of the Minerva endometrial ablation system. Bansi-Matharu L, Gurol-Urganci I, Mahmood T, Templeton A, van der Meulen J, Cromwell D. Rates of subsequent surgery following endometrial ablation among English women with menorrhagia: populationbased cohort study. Predicting pelvic pain after endometrial ablation: which preoperative patient characteristics are associated Pathology of endometrial ablation failures: a clinicopathologic study of 164 cases. Ultrasoundguided reoperative hysteroscopy for managing global endometrial ablation failures. Second generation endometrial ablation techniques for heavy menstrual bleeding: network meta-analysis. Five-year follow up of a randomised controlled trial comparing NovaSure and ThermaChoice endometrial ablation. Ten-year follow-up of a randomised controlled trial comparing bipolar endometrial ablation with balloon ablation for heavy menstrual bleeding. Bipolar radiofrequency endometrial ablation compared with hydrothermablation for dysfunctional uterine bleeding: a randomized controlled trial. Five-year follow-up after comparing bipolar endometrial ablation with hydrothermablation for menorrhagia. Combined endometrial ablation and levonorgestrel intrauterine system use in women with dysmenorrhea and heavy menstrual bleeding: novel approach for challenging cases. In some instances they may be a sequella of intrauterine procedures such as myomectomy or metroplasty for removal of an intrauterine septum. Should such adhesions be present in the context of infertility or recurrent pregnancy loss, hysteroscopic treatment is necessary.

The diseases they cause are in part the result of their being strictly anaerobic (oxygen free) antibiotics for sinus infection symptoms tetracycline 500 mg buy low cost. If they enter a cut or wound antibiotic resistance pdf discount 500 mg tetracycline overnight delivery, or any anaerobic environment antimicrobial nasal spray discount tetracycline 250 mg on line, the spores may germinate infection 6 weeks after hysterectomy buy tetracycline with paypal, producing a toxin associated with tetanus antibiotic resistant gonorrhea snopes discount 250 mg tetracycline overnight delivery. If the infected person has not been immunized against the toxin, the disease produces a loss of control of motor neurons, resulting in a spastic paralysis (lockjaw). While rare, botulism poisoning usually results from canned vegetables that have not been properly sterilized. Campylobacter and Helicobacter, members of the -Proteobacteria, are among the most recently discovered pathogens. Campylobacter is an important cause of infant diarrhea, particularly in developing countries. Helicobacter infections of the stomach were found to be associated with the development of stomach ulcers. As a result of this connection, the treatment of ulcers with antibiotics rather than with palliative methods (antacids) was found to be more effective in preventing ulcer recurrence. Drug Susceptibility Toxic substances such as mercury, which could be used to treat diseases such as syphilis, have been known since the seventeenth century. However, the concept of a "magic bullet," a safe antimicrobial agent that would kill germs and cure disease, dates to the 1880s, when the germ theory of disease was evolving. The first success in this area of research was the arsenic compound salvarsan, developed by German Salem Health physician Paul Ehrlich, who was able to successfully treat syphilis with the compound. Arguably the primary impetus in researching antimicrobial drugs grew from the enormous number of casualties of World War I, in which infection was as likely to result in death as was the wound itself. The first success in antimicrobial therapy was the discovery of sulfa drugs by German physician Gerhard Domagk. Working closely with the dye industry in the 1920s and 1930s, Domagk discovered that sulfur derivatives, the sulfonamides, could kill streptococci, among the deadliest of bacteria. Meanwhile, penicillin, discovered by British scientist Alexander Fleming in 1928, became the first broad-spectrum antibiotic effective against most major bacteria. For example, the penicillins inhibit cross-linking of the cell-wall peptidoglycan in gram-positive cells such as the staphylococci and streptococci. Some bacteria have acquired genetic information to produce enzymes that destroy or inactivate antibiotics. In particular, most staphylococci have developed a penicillinase that inactivates penicillin, rendering the drug useless. Other bacteria have acquired genetic information to enzymatically modify other antibiotics. Bacteria may also become resistant by changing the target of the drug; altered ribosome structures confer resistance to erythromycin or streptomycin. Bacteria: Structure and growth · 103 General Structure Bacteria are the most common life-form on Earth. The millions of known species of bacteria live in a wide range of environments, from vents deep in the ocean floor to the recesses of the human digestive tract. The vast majority of bacteria are harmless to humans; some are actually helpful and necessary for human health, while a small fraction are pathogenic. Despite these diverse features, all types of bacteria have fundamental characteristics in common. Bacteria have a simpler structure than plant and animal cells, which are higher life-forms called eukaryotes. They consist of just one compartment that is separated from the outside world by a cell membrane and a cell wall. The interior of the cell, called cytoplasm, contains a solution of sugars, salts, vitamins, enzymes, and other substances dissolved in water. The cell membrane is a semipermeable barrier that separates the inside of the cell from the outside. The membrane is created by the assembly of phospholipids and proteins into a bilayer. The inner and outer surfaces of the bilayer are charged and, thus, are attracted to the water molecules inside and outside the cell. These chemical properties of the cell membrane ensure that the watery contents of the cell cannot leak through. The structure of cell membranes also allows for the selective passage of certain molecules. This important feature ensures that necessary nutrients are allowed to enter the cell and that waste products are allowed to exit. While some substances cross the membrane through passive diffusion, most are transported actively by processes that require energy. The active transport of molecules across the membrane is mediated by proteins that are embedded in the cell membrane. The cell membrane also serves as a site for the attachment of proteins involved in essential biochemical reactions. One example is the electron transport Bacteria: Structure and growth Category: Pathogen Definition Bacteria are single-celled organisms that reside in every habitat, including the human body. Bacteria are a necessary part of the normal flora of the human body; very few species actually cause illness, and many are beneficial. The bacterial cell membrane thus provides some of the functions carried out by organelles in eukaryotes. The cell wall is a tough network of fibers that encloses and protects the bacterial cell. The substance that makes up the cell wall is a unique polymer called peptidoglycan, which is not found in eukaryotes. Peptidoglycan is made of long sugar molecules that are connected to each other by short peptides. Bacteria can be divided into two major groups based on the structure of their cell walls. The extra protection provided by the more complex cell wall of gram-negative bacteria makes them less sensitive to some antibiotics, which can penetrate the cell walls of only the gram-positive bacteria. Penicillins, cephalosporins, and vancomycin interfere with cell-wall construction, causing the bacteria to rupture and die. The goal in treating bacterial infections with antibiotics is to kill the intended organisms without damaging the cells of the host. Because human and animal cells lack cell walls, they are not affected by such drugs. The internal components of bacteria use nutrients in the environment to allow the organisms to grow and reproduce. Slight differences in the structure of eukaryotic and prokaryotic ribosomes make the ribosome a target for antibiotic action. Multiple classes of antibiotics, including streptomycin (and its relatives), tetracycline, and erythromycin, disrupt protein synthesis in bacteria but not in the cells of the host. The bacterial chromosome contains all the information needed to provide for the basic functions of the Salem Health organism. The genes on plasmids are not usually necessary for survival, but they may become so in certain environments; plasmids can carry genes for antibiotic resistance, allowing the host bacteria to survive in the presence of a drug that is normally deadly to its species. Specialized Features the variety of specialized features found in bacteria reflects their adaptation to the broadest range of environments of any organism on Earth. Although the average size of a bacterial cell is 1 to 5 micrometers (m) in diameter, they range in size from 0. One of the most distinguishing features of bacterial cells is their shapes, which can be used diagnostically. The most common shapes are spheres (cocci), rods (bacilli), comma shapes (vibrios), and spirals (spirochetes and spirillum). Many bacteria have developed specialized structures that allow them to move in their environment. Some have flagella, which are long filaments that protrude from the cell wall and are used to produce a swimming motion. A cell can have a single flagellum or multiple flagella, either clumped at one end of the cell or spread over the entire surface. Some bacteria exhibit a gliding motion, which is created by structures known as pili. These cell surface projections can extend and retract, causing the bacteria to move. Some aquatic bacteria use gas vesicles to adjust their position in their environment. When present, they increase the buoyancy of the organism, making it rise to the water surface. Gas vesicles disintegrate and reassemble according to the concentration of nutrients in the cell. Capsules are specialized structures that add an extra layer of protection to the exterior of some bacterial cells. Species that have capsules are extremely resistant to the action of phagocytes, cells of the host immune system that engulf and kill bacteria. Capsule-bearing strains of Streptococcus pneumoniae, for example, cause a particularly invasive and dangerous form of pneumonia. Infectious Diseases and Conditions Some species of bacteria can survive harsh conditions by forming endospores, which allow the bacteria to become dormant. Once the bacteria die, the endospores are released into the environment, where they can survive indefinitely. These tough structures are resistant to heat, radiation, chemicals, and desiccation. When environmental conditions improve, the endospore rapidly germinates and develops into a bacterial cell. Endospore-forming bacteria include Bacillus anthracis, which causes anthrax, and Clostridium botulinum, responsible for a serious form of food poisoning called botulism. Bacterial Growth Bacteria possess all the machinery necessary to grow and reproduce independently of other cells. While they may use a host organism as a habitat, nearly all bacteria can reproduce without invading host cells. This feature sets them apart from viruses, which carry their own genetic material but require host-cell components for reproduction. The small size and relatively simple structure of bacteria allow them to grow and reproduce much faster than eukaryotic cells. Bacteria reproduce asexually by dividing in half, in a process called binary fission. When enough new material is present to sustain two cells, the cell membrane begins to pinch inward at the center. A cell wall grows to form a partition that divides the cell into two daughter cells. Because bacterial reproduction is asexual, each daughter will be identical to the parent cell. Populations of bacteria grow at a rate determined by the time it takes individual cells to grow and divide, creating the next generation. The time required for a population of cells to double is known as the doubling time. Bacterial doubling times vary with the species, ranging from a few minutes to several hours. The nearly explosive growth rate of bacteria is about one hundred times faster than that of eukaryotic cells. Bacteria: Structure and growth · 105 Rapid binary fission allows bacteria to become extremely numerous in a short amount of time. If one bacterium with a doubling time of twenty minutes were allowed to grow for forty-four hours, the resulting mass of bacteria produced would equal the mass of the earth. Factors Affecting Bacterial Growth Rates the actual occurrence of exponential bacterial growth is greatly limited by environmental factors, both in natural habitats and in laboratories. Bacterial growth rates are highly dependent on many factors, including temperature, the availability of nutrients, pH (acidity), and oxygen concentrations. Measures that reduce the rate of bacterial growth can be used to prevent illnesses caused by bacteria; most pathogenic bacteria must be present in large numbers to cause illness. Bacteria that live inside humans, including those of medical significance, thrive at an optimal temperature of about 98. Their ability to survive below the optimal temperature may allow them to live outside a host for short periods until they enter a new host. This temperature tolerance facilitates the spread of bacteria from one host to another. Bacterial growth rates can be reduced by controlling the temperature of the environment. Refrigeration of food slows the growth of bacteria, keeping their numbers low enough to prevent illness. Aqueous solutions heated to boiling 212° F (100° C) for thirty minutes will kill all bacteria in the solution. Medical instruments and solutions can be sterilized in an autoclave by heating above 248° F (120° C), which kills bacteria and heat-tolerant endospores. General nutritional requirements of most bacteria include a carbon-source for energy, such as sugar; a nitrogen source, such as ammonia or nitrate; a variety of minerals and salts; vitamins; and other growth factors. Most species of bacteria grow optimally in neutral environments, with a pH level between 6 and 8. Some species are specially adapted to live in extremely acidic or basic environments. The optimal pH of a given species will determine where it thrives, even within the human body. The stomach, with a pH of 2, is home to low numbers of acid-tolerant species of lactobacilli and streptococci. The large intestine, with a neutral pH of 7, is a much more popular residence; enormous numbers of bacteria from a minimum of ten different species live in the large intestine.

In most instances bacterial diseases discount tetracycline line, there exist effective medical therapies antimicrobial therapy order generic tetracycline online, and should they fail antibiotics for pimples acne generic 250 mg tetracycline mastercard, or be intolerable for the patient virus hpv buy generic tetracycline 250 mg online, there are a number of alternatives to hysterectomy that have been demonstrated effective antibiotics for comedonal acne tetracycline 250 mg buy free shipping. Evaluation should follow a structured approach, preferably initially base upon transvaginal ultrasound, with endometrial sampling and hysteroscopy performed as appropriate. A systematic review evaluating health-related quality of life, work impairment, and health-care costs and utilization in abnormal uterine bleeding. A process designed to lead to international agreement on terminologies and definitions used to describe abnormalities of menstrual bleeding. Can we achieve international agreement on terminologies and definitions used to describe abnormalities of menstrual bleeding Prevalence, 1-year regression rate, and clinical significance of asymptomatic endometrial polyps: cross-sectional study. Clinical effectiveness of transcervical polyp resection in women with endometrial polyps: randomized controlled trial. Ultrasound scan and magnetic resonance imaging for the diagnosis of adenomyosis: Systematic review comparing test accuracy. Adenomyosis and subfertility: A systematic review of prevalence, diagnosis, treatment and fertility outcomes. High cumulative incidence of uterine leiomyoma in black and white women: Ultrasound evidence. World Health Organization Classification of Tumors: Pathology and Genetics of Tumours of the Breast and Female Genital Organs. Evaluation and management of acute menorrhagia in women with and without underlying bleeding disorders: consensus from an international expert panel. Hemostasis and menstruation: appropriate investigation for underlying disorders of hemostasis in women with excessive menstrual bleeding. Disorders of hemostasis and excessive menstrual bleeding: prevalence and clinical impact. A statistical analysis of the menstrual patterns of 8,000 Finnish girls and their mothers. Clinical review: adolescent anovulation: maturational mechanisms and implications. Prevalence of hyperprolactinemia in adolescents and young women with menstruation-related problems. Antipsychotic-induced hyperprolactinaemia, hypogonadism and osteoporosis in the treatment of schizophrenia. Interrelationships between ovarian and pituitary hormones in ovulatory menstrual cycles across reproductive age. Cyclic changes in endometrial tissue plasminogen activator and plasminogen activator inhibitor type 1 in women with normal menstruation and essential menorrhagia. Prostaglandin synthesis in the endometrium of women with ovular dysfunctional uterine bleeding. The effects of intrauterine contraceptive devices on the ultrastructure of the 43. Subject and clinician experience with the levonorgestrel-releasing intrauterine system. Uterine arteriovenous malformations induced after diagnostic curettage: a systematic review. Oral medroxyprogesterone acetate and combination oral contraceptives for acute uterine bleeding: a randomized controlled trial. Highdose medroxyprogesterone acetate for the treatment of dysfunctional uterine bleeding in 24 adolescents. A new progestogenonly medical therapy for outpatient management of acute, abnormal uterine bleeding: a pilot study. Use of intravenous Premarin in the treatment of dysfunctional uterine bleeding-double-blind randomized control study. Intrauterine balloon tamponade as a treatment for immune thrombocytopenic purpura-induced severe uterine bleeding. Endometrial ablation for lifethreatening abnormal uterine bleeding: a report of two cases. Successful emergency endometrial ablation for intractable uterine bleeding in a postmenopausal woman complicated with liver cirrhosis and morbid obesity. Emergency endometrial ablation for life-threatening uterine bleeding as a result of a coagulopathy. Emergent thermal balloon ablation for acute uterine hemorrhage: a report of 2 cases. Near-fatal uterine hemorrhage during induction chemotherapy for acute myeloid leukemia: a case report of bilateral uterine artery embolization. A preliminary study of factors influencing perception of menstrual blood loss volume. Diagnostic hysteroscopy in abnormal uterine bleeding: a systematic review and metaanalysis. Comparison of levonorgestrel intrauterine system versus hysterectomy on efficacy and quality of life in patients with adenomyosis. Ultrasound-guided high-intensity focused ultrasound ablation for adenomyosis: the clinical experience of a single center. Comparison of surgery alone and combined surgical-medical treatment in the management of symptomatic uterine adenomyoma. Reproductive performance of severely symptomatic women with uterine adenomyoma who wanted preservation of the uterus and underwent combined surgical-medical treatment. The efficacy of levonorgestrel-releasing intrauterine device in selected cases of myoma-related menorrhagia: a prospective controlled trial. A randomized trial evaluating leuprolide acetate before hysterectomy as treatment for leiomyomas. The spectrum of endometrial pathology induced by progesterone receptor modulators. Clinical utility of progesterone receptor modulators and their effect on the endometrium. Endometrial morphology after treatment of uterine fibroids with the selective progesterone receptor modulator, ulipristal acetate. A randomized, controlled clinical trial comparing the effects of aromatase inhibitor (letrozole) and gonadotropinreleasing hormone agonist (triptorelin) on uterine leiomyoma volume and hormonal status. The HydroThermAblator system for management of menorrhagia in women with submucous myomas: 12- to 20-month follow-up. Endometrial hydrothermablation: a comparison of short-term clinical effectiveness in patients with normal endometrial cavities and those with intracavitary pathology. Office endometrial ablation with local anesthesia using the HydroThermAblator system: comparison of outcomes in patients with submucous myomas with those with normal cavities in 246 cases performed over 5(1/2) years. Multisite management study of menorrhagia with abnormal laboratory haemostasis: a prospective crossover study of intranasal desmopressin and oral tranexamic acid. The use of levonorgestrel-releasing intrauterine system for treatment of menorrhagia in women with inherited bleeding disorders. Treatment of ovulatory and anovulatory dysfunctional uterine bleeding with oral progestogens. Efficacy of micronised vaginal progesterone versus oral dydrogestrone in the treatment of irregular dysfunctional uterine bleeding: a pilot randomised controlled trial. Outcomes following hysterectomy or endometrial ablation for heavy menstrual bleeding: retrospective analysis of hospital episode statistics in Scotland. Uterusvapokauterisation, tod durch septische peritonitis nach spontaner sekundarer perforation. Levonorgestrel-releasing intrauterine system and endometrial ablation in heavy menstrual bleeding: a systematic review and meta-analysis. Non-steroidal anti-inflammatory drugs for heavy bleeding or pain associated with intrauterine-device use. Preventive treatment of intrauterine deviceinduced menstrual blood loss with tranexamic acid in Chinese women. Efficacy, acceptability and side effects of the levonorgestrel intrauterine system for menorrhagia. Efficacy of mifepristone in reducing intermenstrual vaginal bleeding in users of the levonorgestrel intrauterine system. A randomized controlled trial of treatment options for troublesome uterine bleeding in Implanon users. The effect of tranexamic acid for treatment of irregular uterine bleeding secondary to Norplant use. Back to the future: hormone replacement therapy as part of a prevention strategy for women at the onset of menopause. Risk of endometrial cancer following estrogen replacement with and without progestins. Hormone replacement therapy in postmenopausal women: endometrial hyperplasia and irregular bleeding. A randomised controlled trial comparing transvaginal ultrasound, outpatient hysteroscopy and endometrial biopsy with inpatient hysteroscopy and curettage. Unexpected vaginal bleeding and associated gynecologic care in postmenopausal women using hormone replacement therapy: comparison of cyclic versus continuous combined schedules. Sonographic endometrial thickness: a useful test to predict atrophy in patients with postmenopausal bleeding: an Italian multicenter study. Age-related differential diagnosis of vaginal bleeding in postmenopausal women: a series of 3047 symptomatic postmenopausal women. Adjuvant tamoxifen therapy for early stage breast cancer and second primary malignancies. Tamoxifen for prevention of breast cancer: report of the National Surgical Adjuvant Breast and Bowel Project P-1 Study. Hysteroscopy and transvaginal ultrasonography in postmenopausal women with uterine bleeding. Assessment of endometrial volume and vascularization using transvaginal 3D power Doppler angiography in women with postmenopausal bleeding. Reproducibility of transvaginal ultrasonographic measurements of endometrial thickness in patients with postmenopausal bleeding. Ultrasonographic endometrial thickness for diagnosing endometrial pathology in women with postmenopausal bleeding: a meta-analysis. Endovaginal ultrasound to exclude endometrial cancer and other endometrial abnormalities. Meta-analysis of the literature or of individual patient data: is there a difference Grey literature in meta-analyses of randomized trials of health care interventions. Endometrial thickness measurement for detecting endometrial cancer in women with postmenopausal bleeding: a systematic review and meta-analysis. Endometrial assessment by vaginal ultrasonography might reduce endometrial sampling in patients with postmenopausal bleeding: a prospective study. Therapeutic response assessment of high intensity focused ultrasound therapy for uterine fibroid: utility of contrast-enhanced ultrasonography. Asymptomatic postmenopausal intrauterine fluid accumulation: characterization and significance. Postmenopausal endometrial fluid collections revisited: look at the doughnut rather than the hole. Differential indication for histological evaluation of endometrial fluid in postmenopause. Echogenic endometrial fluid collection in postmenopausal women is a significant risk factor for disease. Gray-scale ultrasound morphology in the presence or absence of intrauterine fluid and vascularity as assessed by color Doppler for discrimination between benign and malignant endometrium in women with postmenopausal bleeding. Saline contrast hysterosonography in abnormal uterine bleeding: a systematic review and meta-analysis. Transvaginal sonography, saline contrast sonohysterography and hysteroscopy for the investigation of women with postmenopausal bleeding and endometrium > 5 mm. Comparison of diagnostic accuracy of saline infusion sonohysterography, transvaginal sonography and hysteroscopy in postmenopausal bleeding. The Vabra aspirator versus the Pipelle device for outpatient endometrial sampling. Pain experienced using two different methods of endometrial biopsy: a randomized controlled trial. 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Incidence of peritoneal cytology from patients with early stage endometrial carcinoma following dilatation and curettage (D & C) versus hysteroscopy and D & C. Retrograde seeding of malignant cells during hysteroscopy in presumed early endometrial cancer. Risk of long-term pelvic recurrences after fluid minihysteroscopy in women with endometrial carcinoma: a controlled randomized study. Impact of hysteroscopy on disease-free survival in clinically stage I endometrial cancer patients.

In the fourth phase virus hunter purchase tetracycline online, the bone is re-formed antibiotic z pak generic tetracycline 500 mg otc, and the medullary cavity is recanalised across the callus antibiotic prescribing guidelines tetracycline 250 mg cheap. Clinical: A stress or fatigue fracture can occur during a bout of unusual physical activity or during overtraining antibiotics names buy cheapest tetracycline and tetracycline. Fractures are called simple if their broken ends do not pierce the skin antibiotics for face infection tetracycline 250 mg order without a prescription, open if the bones jut out and pathological if the bone involved is defective because of some disease process. Misalignment of the two ends of the bone during the remodelling phase can lead to a permanent disability. A hard, bony outgrowth, whether asymptomatic or painful on mechanical irritation, can be a sign of one of the exostosis syndromes. Metacarpal bones Phalanges Femur Patella Tibia Fibula Tarsal bones Metatarsal bones Phalanges Comments Anatomical: the body skeleton, composed of 206 bones, is divided into many parts. The axial skeleton forms the central axis of the body and is made up of the cranium, the vertebral column, the ribs and the sternum. The appendicular skeleton consists of the shoulders, the pelvic girdle and the limb bones. Physiological: Depending on their anatomical location, bones take part in movements and the protection of organs. Clinical: the fetal skeleton is cartilaginous; ossification starts before birth and continues until adulthood. The dry mass of the skeleton without red marrow is higher in men, 5 kg; it is 3 kg in women. In cases of physical trauma, a clinical examination includes looking for pain and for partial or total loss of function, the site of the lesion and evidence of failure of the respiratory, vascular or nervous system. Cranium Cervical vertebrae Scapula Ribs Thoracic vertebrae Lumbar vertebra Pelvis Sacrum Coccyx 10. Femur Patella Tibia Fibula Tarsal bones Calcaneus Metatarsal bones Phalanges Comments Anatomical: the axial skeleton is made up of the head, the vertebral column, the ribs and the sternum. The vertebral column has 26 bones; 24 of them are separate vertebrae located between the occipital bone and the sacrum. It is subdivided into segments; the cervical segment has seven vertebrae, the thoracic segment has twelve vertebrae and the lumbar segment has five vertebrae. The sacrum results from the fusion of five vertebrae; the coccyx results from the fusion of three or four vertebrae. The appendicular skeleton is comprised of the shoulders, the pelvic girdle and the limb bones. Physiological: the functions of the skeleton are to provide a frame for the body, allow movements to take place and protect some organs, such as the heart and lungs in the thoracic cage and the brain inside the cranium. Clinical: Depending on its location, a bone fracture can cause respiratory, vascular or neurological problems. The clinical picture would suggest looking specifically for an open wound, for a haematoma undergoing more or less progressive resorption, for oedema, with the risk of nerve compression, and for multiple contusions. Coronal suture Parietal bone Temporal bone Squamosal suture Lambdoid suture Occipital bone Mastoid process Mandible Maxillary Zygomatic bone Lacrimal bone Ethmoid bone Nasal bone Sphenoid bone Frontal bone Comments Anatomical: the cranium consists of eight flat or irregular bones that protect the brain-the frontal bone, the occipital bone, the sphenoid bone, the ethmoid bone, the two parietal and the two temporal bones. The coronal suture unites the frontal and the two parietal bones, the sagittal suture unites the parietal bones, the lambdoid suture unites the parietal and occipital bones, and the squamosal suture unites the parietal and temporal bones. The nerves, the blood vessels and the lymphatics go through perforations, or foramina. The zygomatic bone is the cheekbone, the maxillary bone is that of the upper jaw and the mandible is that of the lower jaw. Clinical: Transient loss of consciousness and attention disturbances can be seen in cases of concussion due to a blow to the head. In cases of cerebral contusion with haemorrhage or oedema, there are neurological disturbances that correspond to the site of the lesion. Ethmoid bone Sphenoid bone Right parietal bone Right temporal bone Foramen magnum Occipital bone Anterior cranial fossa Middle cranial fossa Posterior cranial fossa Comments Anatomical: There are three cranial fossae. The anterior fossa is made up of the ethmoid and frontal bones, the middle fossa is made up of the sphenoid, parietal and temporal bones, and the posterior fossa is made up of the occipital bone. The ethmoid bone forms part of the orbital cavity, the nasal cavity and the nasal septum. The olfactory nerve runs along the ethmoid bone, and the optic nerve goes through the optic foramen of the sphenoid. Physiological: the orbits protect the eyes and provide sites of attachment for the muscles that move them. Clinical: the leakage of clear fluid from the nose and the loss of cerebrospinal fluid through the ears suggest a fracture at the base of the cranium associated with the presence of fistulae between the meninges, nasal cavities, and middle ear, respectively. In cases of head trauma, neurological signs and symptoms may include pain, loss of consciousness, coma, disorientation in time and space, mental clouding, agitation or drowsiness, loss of feeling and motor paralysis. Loss of consciousness can cause respiratory problems or the aspiration of gastric contents, culminating in a medical emergency. Headaches, nosebleeds, partial loss of visual acuity, progressive loss of eye movements, facial neuralgia or paralysis, partial hearing loss, vertigo and problems with balance or swallowing are potential indications of tumours at the cranial base. External acoustic meatus Squamous part Zygomatic process Site of the temporomandibular joint Styloid process Mastoid process Mastoid part Comments Anatomical: the zygomatic process and the zygomatic bone make up the zygomatic arch. The styloid process provides attachment sites for the muscles of the tongue and the pharynx. The mastoid process, lying behind the ear, contains cavities that communicate with it. Loss of hearing, pain and the rapid onset of a high fever with shivering raise the possibility of mastoiditis. Condyles for articulation with the atlas Comments Anatomical: the occipital bone forms the back of the head and part of the cranial base. Physiological: the occipital bone and the atlas together form the bicondylar joint, which allows bending movements of the head to occur. Clinical: the term joint refers to all forms of union between two parts of the skeleton without necessarily implying any notion of mobility. Articular facet for the ethmoid Lesser wing Greater wing Foramen ovale Pituitary fossa Optic foramen Articular facet for the occipital bone Articular facet for the temporal bone Articular facet for the parietal bone Articular facet for the frontal bone Comments Anatomical: the butterfly-shaped sphenoid bone occupies the middle part of the cranial base. Physiological: the optic foramen allows the passage of the optic nerve, and the foramen ovale allows the passage of the mandibular nerve (a branch of the trigeminal nerve). Clinical: Severe headaches behind the eye and a high fever suggest sphenoid sinusitis. If the symptoms persist beyond 2 weeks, the sinusitis is termed chronic; otherwise it is termed acute. Cribriform plate of the ethmoid bone Sphenoidal sinus Inferior nasal concha Middle nasal concha (ethmoidal) Maxillary bone Superior nasal concha (ethmoidal) Nasal bone Frontal bone Comments Anatomical: the frontal bone forms part of the orbital cavities and the supraorbital margin. The ethmoid bone contributes to the formation of the orbital cavity, the nasal septum, the lateral walls of the nasal cavity and the superior and middle nasal conchae. It also contains air sinuses that open into the nasal cavity via the cribriform plate in its roof. Physiological: By increasing the surface area of the nasal cavity, the conchae warm up and humidify the respired air. Clinical: Facial pain, diffuse headache, fever, nasal congestion and sneezing are the typical symptoms of sinusitis. The nasal secretions can be purulent (greenish-yellow in colour) or transparent in cases of viral sinusitis. The signs and symptoms of frontal sinusitis and ethmoidal sinusitis are different; a pounding pain above the eye, high fever and a runny nose on one side suggest the former, whereas swelling of one eyelid, pain at the level of the eye and a temperature above 38. Frontal bone Ethmoid bone Sphenoid bone Lacrimal bone Zygomatic bone Maxilla Mandible Inferior nasal concha Vomer Nasal bone Temporal bone Parietal bone Comments Anatomical: the facial skeleton is comprised of 14 bones: the frontal bone, two zygomatic bones (cheekbones), two nasal bones (confined to the nose), two palatine bones, two lacrimal bones, two inferior nasal conchae, the maxilla (the bone of the upper jaw), the vomer and the mandible (the bone of the lower jaw). The L-shaped palatine bones form part of the palate and the lateral wall of the nasal cavity. Physiological: the mandible (the bone of the lower jaw) is the only mobile bone in the head. The mandible and the maxilla contain the alveolar processes, where the teeth are implanted. The mandible, the site of attachment of muscles and ligaments, forms part of the temporomandibular joint. The ethmoid bone protects the eyes and gives attachment to the muscles that move them. Clinical: the diagnostic features of a broken nose include pain, mobility and swelling of the nose, with or without distortion of the nasal septum. Coronoid process Condylar process Articular facet for the temporomandibular joint Ramus Angle Alveolar process Body Comments Anatomical: the bone of the mandible (the lower jaw) is made up of two parts joined by a median line to form a curved body that contains the teeth embedded in its alveolar process and a ramus, which divides to form the condylar process and the coronoid process. Clinical: the signs and symptoms of a mandibular fracture include pain when moving the mandible, pain during mastication, bleeding from the mouth, drooling (sialorrhea), and trismus (constant involuntary contractions of the jaw muscles). Physiological: the posterior and anterior fontanelles ossify by 3 months and by 12 to 18 months of age, respectively. Conversely, a bulging fontanelle suggests an intracranial space-occupying process associated with a subdural haematoma, meningitis or encephalitis. Failure of the fontanelles to close after 18 months is a sign of congenital hypothyroidism (cretinism) or of rickets. Intervertebral discs Intervertebral foramina Coccyx Sacrum Lumbar vertebrae (5) Thoracic vertebrae (12) Cervical vertebrae (7) Comments Anatomical: the vertebral column is made up of 26 bones-24 vertebrae, the sacrum and the coccyx. The seven cervical vertebrae make up the cervical region, the 12 thoracic vertebrae make up the thoracic region, and the five lumbar vertebrae make up the lumbar region. The intervertebral disc is a cushion-like fibrocartilaginous structure that prevents direct contact between the bones. Physiological: the vertebral column acts as a bony protector of the fragile spinal cord. The vertebral foramina cooperate to form the spinal canal and the intervertebral discs act as shock absorbers. The column supports the head, maintains the axis of the trunk and allows movements to occur. Clinical: Each vertebra is identified by the first letter of the region of the column to which it belongs, followed by a number, which indicates its location. Kyphosis and lordosis are deformities of the vertebral column characterised, respectively, by an excessive posterior convexity and an excessive anterior convexity. Body Pedicle Transverse process Lamina Spinous process Superior articular process Vertebral arch Vertebral foramen Comments Anatomical: A vertebra is made up of a vertebral body attached to a vertebral arch by two pedicles. The vertebrae articulate with each other at the level of their flat bodies, which nevertheless are not in contact because of the intervening intervertebral discs. The vertebral arch encloses the vertebral foramen; its walls consist of pedicles and bony laminae and allow the passage of the spinal cord. Flexion (bending forward), extension (bending backward), lateral flexion (bending to one side) and rotation are movements that occur mostly in the cervical and lumbar regions. Clinical: Lumbago, or pain in the lumbar region, suggests the presence of arthritis or degenerative changes in the discs. Pain, sphincter disturbances and neurological signs and symptoms, including paraplegia, are suggestive of spinal cord compression, characterised by motor and sensory deficits related to the level of compression. Body Transverse process Vertebral foramen Lamina Bifid spinous process Articular process with a facet (in blue) for the adjacent vertebra Pedicle Foramen transversarium for the vertebral artery Comments Anatomical: the cervical vertebrae are the smallest bones in the column. The first two, the atlas and the axis, are different from the other five (C3­C7), which share similar features. Their bodies are small, their vertebral foramina are larger than those of the others, and their spinous processes are bifid, with two extremities. Their transverse processes contain foramina transversaria, which allow the vertebral artery (a branch of the subclavian artery) to travel up to the brain. Physiological: Their movements include flexion (bending forward), extension (bending backward), lateral flexion (bending to one side) and rotation. Clinical: the seventh cervical vertebra (C7) has a prominent spinous process in the shape of a bulbous tubercle, which can be felt at the base of the neck. The risk of dislocation is highest in the cervical region because the articular facets of these vertebrae are more horizontal and do not fit together as well. The width of the vertebral canal in this region allows a minor dislocation to occur without any damage to the cord, which can, however, take place in cases of severe dislocation or fracture. Articular facet for the dens (odontoid process) of the axis Pedicle Foramen transversarium for the vertebral artery Lamina Posterior tubercle equivalent to the spinous process Articular facet for the occipital condyle Comments Anatomical: the first cervical vertebra, the atlas or C1, according to nomenclature used for naming the vertebrae, is a bony ring on which the head rests. It lies above the axis (C2) and is made up of an anterior arch and a posterior arch fused together. It bears two flat facets on its superior aspect and two short transverse processes perforated by the foramen transversarium, which is a passage for the vertebral artery on its way to the brain. Physiological: the facets form condylar joints with the occipital bone and the axis, allowing movements of head flexion and extension to occur. Clinical: As the effects of a traumatic injury to the atlas are regressing, a search for vascular signs and symptoms will help establish the diagnosis of the lesions involved. Dens (odontoid process) Facet for the atlas Pedicle Lamina Spinous process Transverse process Foramen transversarium for the vertebral artery Facet for the transverse ligament Body Comments Anatomical: the axis, or C2, according to the nomenclature used for vertebrae, is the second cranial vertebra, which lies below the atlas. It has a small body with a structure projecting upwards, which is called the dens or odontoid process and that partly fills the posterior foramen of the atlas and makes contact with the transverse ligament. Physiological: By articulating with the atlas, the axis allows the head to be rotated from side to side. Clinical: As the effects of a traumatic injury to the axis are receding, looking for vascular signs and symptoms will help establish the diagnosis of the lesions involved. Transverse ligament Atlas Axis Spinous process of axis Vertebral foramen Dens (odontoid process) of axis Comments Anatomical: the atlas (C1) and the axis (C2) are the first two cervical vertebrae. The axis has a structure projecting upwards, the dens, which articulates anteriorly with the bony part of the atlas and posteriorly with the ligamentous portion of the ring of the atlas.

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