Pierre-Yves Mure, MD

• Professor of Pediatric Surgery,
• Claude-Bernard University, Lyon, France
• Consultant in Pediatric Surgery,
• H?pital M?re-Enfants?GHE,
• Bron, France

Obstructive sleep apnoea in patients with dilated cardiomyopathy: effects of continuous positive airway pressure treatment vitamin d deficiency discount cordarone online. Hemodynamic effects of simulated obstructive apneas in humans with and without heart failure symptoms you have worms generic cordarone 250 mg free shipping. Acute and chronic effects of airway obstruction on canine left ventricular performance symptoms nausea headache buy generic cordarone 200mg on-line. The effects of large negative intrathoracic pressure on left ventricular function in patients with coronary artery disease medications versed 250mg cordarone purchase fast delivery. Augmented sympathetic neural response to simulated obstructive apnoea in human heart failure medications like tramadol 100 mg cordarone buy with amex. Influence of ventilation and hypocapnia on sympathetic nerve responses to hypoxia in normal humans. Immediate effects of arousal from sleep on cardiac autonomic outflow in the absence of breathing in dogs. Muscle sympathetic nerve activity during wakefulness in heart failure patients with and without sleep apnea. Neurochemical evidence of cardiac sympathetic activation and increased central nervous system norepinephrine turnover in severe congestive heart failure. Plasma norepinephrine as a guide to prognosis in patients with chronic congestive heart failure. Elevated production of tumor necrosis factor-alpha by monocytes in patients with obstructive sleep apnea syndrome. Circulating nitric oxide is suppressed in obstructive sleep apnea and is reversed by nasal continuous positive airway pressure. Selective activation of inflammatory pathways by intermittent hypoxia in obstructive sleep apnea syndrome. Predictors of elevated nuclear factor-kappaB-dependent genes in obstructive sleep apnea syndrome. Lyons was supported by a Canadian Thoracic Society/European Respiratory Society Peter Macklem Joint Research Fellowship, and by the Joseph M. Bradley was supported by the Clifford Nordal Chair in Sleep Apnea and Rehabilitation Research. Women have consistently 1 Sleep-Disordered Breathing Unit, Respiratory Dept, Hospital Universitario de Valme, Seville, Spain. Correspondence: Francisco Campos-Rodríguez, Sleep-Disordered Breathing Unit, Respiratory Dept, Hospital Universitario de Valme, 41014, Seville, Spain. Women usually come to clinical interviews alone, so it is probable that symptoms witnessed by their partner, such as snoring and apnoeic events, may be under reported [8, 9]. Other researchers have suggested that the characteristics of snoring may differ from men to women, which may also have an impact on clinical suspicion [10]. More importantly, women, unlike men, more frequently present with "atypical" symptoms, such as depression, anxiety, insomnia, headache and fatigue [1, 11­15]. This different presentation, rather than any real differences in symptoms, coupled with a low awareness among physicians, may lead to delayed recognition of the disease and underdiagnosis. Men tend to show a higher proportion of central body fat, including both visceral adiposity and upper body fat, as opposed to peripheral obesity in women [9, 22, 23]. There is controversy as to whether women have different respiratory control stability than men. Some studies suggest that ventilatory stability in men may be more susceptible to the influence of chemical factors than women [26­28]. This lower propensity to airway collapse is translated to the polysomnographic profile. Other studies with smaller sample sizes have also reported a lower functional status, greater mood disturbance and poorer neurobehavioral performance compared to men [44, 45]. This impairment in quality of life, mood and cognitive performance is reflected in an increased use of health resources and work disability. After adjusting for confounders, nocturnal minimal saturation was independently associated with decreased insulin sensitivity the incidence of type 2 diabetes mellitus was 24. This evidence rests, however, on series composed exclusively or predominantly of males, or on others in which the effect of sex has not been properly assessed [71­80] (fig. However, in most of the studies included in the meta-analysis the number of women was either very small or unreported. Nevertheless, research in this area is very scarce, as has been highlighted in a recent review [122]. Treatment Changes in sleep position, moderate weight gain and alcohol avoidance should be advised during pregnancy. Pressure requirements may slightly increase by 1­2 cmH2O during the course of the pregnancy [99]. These aforementioned disparities suggest that there may also be sex differences in health, functional and cardiovascular outcomes. High-quality trials involving large samples of women are needed to confirm these findings. Gender differences in sleep apnea: epidemiology, clinical presentation and pathogenic mechanisms. Gender differences in obstructive sleep apnea syndrome: a clinical study of 1166 patients. Differences between men and women in the clinical presentation of patients diagnosed with obstructive sleep apnea syndrome. Gender-related differences in symptoms of patients with suspected breathing disorders in sleep: a clinical population study using the sleep disorders questionnaire. Associations between gender and measures of daytime somnolence in the Sleep Heart Health Study. The impact of ageing and sex on the association between sleepiness and sleep disordered breathing. Gender differences in the expression of sleep-disordered breathing: role of upper airway dimensions. Contribution of male sex, age, and obesity to mechanical instability of the upper airway during sleep. Sex differences in the association of regional fat distribution with the severity of obstructive sleep apnea. Differences in associations between visceral fat accumulation and obstructive sleep apnea by sex. Combined effects of female hormones and metabolic rate on ventilatory drives in women. Respiratory control stability and upper airway collapsibility in men and women with obstructive sleep apnea. Menopausal status and sleep-disordered breathing in the Wisconsin Sleep Cohort Study. Sleep-disordered breathing and nocturnal oxygen desaturation in postmenopausal women. Relative influence of age and menopause on total and regional body composition changes in postmenopausal women. Rapid eye movement-related sleep-disordered breathing: influence of age and gender. Women with partial upper airway obstruction are not less sleepy than those with obstructive sleep apnea. Gender differences in morbidity and health care utilization among adult obstructive sleep apnea patients. Gender differences in obstructive sleep apnea and treatment response to continuous positive airway pressure. Psychological morbidity, illness representations, and quality of life in female and male patients with obstructive sleep apnea syndrome. Gender-specific differences in a patient population with obstructive sleep apnea-hypopnea syndrome. Long-term continuous positive airway pressure compliance in females with obstructive sleep apnoea. Sleep-disordered breathing, hypoxia, and risk of mild cognitive impairment and dementia in older women. Determinants affecting health-care utilization in obstructive sleep apnea syndrome patients. Association between obstructive sleep apnea and elevated levels of type B natriuretic peptide in a community-based sample of women. Relationship between sleep-disordered breathing and markers of systemic inflammation in women from the general population. Hypertension prevalence in obstructive sleep apnoea and sex: a population-based case­control study. Obstructive sleep apnea syndrome is associated with higher diastolic blood pressure in men but not in women. Evening-morning differences in blood pressure in sleep apnea syndrome: effect of gender. Nocturnal intermittent hypoxia predicts prevalent hypertension in the European Sleep Apnoea Database cohort study. The effect of gender on the prevalence of hypertension in obstructive sleep apnea. Obstructive sleep apnoea is associated with decreased insulin sensitivity in females. Impact of gender on incident diabetes mellitus in obstructive sleep apnea: a 16-year follow-up. Sleep apnoea, sleepiness, inflammation and insulin resistance in middle-aged males and females. Obstructive sleep apnea-hypopnea and incident stroke: the sleep heart health study. All-cause mortality in males with sleep apnoea syndrome: declining mortality rates with age. Role of sleep apnea and continuous positive airway pressure therapy in the incidence of stroke or coronary heart disease in women. Progression and regression of sleep-disordered breathing with changes in weight: the Sleep Heart Health Study. The effects of hormone replacement therapy on sleep-disordered breathing in postmenopausal women: a pilot study. Effect of short-term hormone replacement in the treatment of obstructive sleep apnoea in postmenopausal women. Medroxyprogesterone in postmenopausal females with partial upper airway obstruction during sleep. Effect of continuous positive airway pressure on the incidence of hypertension and cardiovascular events in nonsleepy patients with obstructive sleep apnea: a randomized controlled trial. Comparison of therapeutic and subtherapeutic nasal continuous positive airway pressure for obstructive sleep apnoea: a randomised prospective parallel trial. Healthcare utilization in women with obstructive sleep apnea syndrome 2 years after diagnosis and treatment. The age and other factors in the evaluation of compliance with nasal continuous positive airway pressure for obstructive sleep apnea syndrome. Long-term compliance rates to continuous positive airway pressure in obstructive sleep apnea: a population-based study. Clinical and polysomnographic predictors of short-term continuous positive airway pressure compliance. Sleep-disordered breathing in pregnancy: a review of the physiology and potential role for positional therapy. Chronic nasal congestion at night is a risk factor for snoring in a population-based cohort study. Perinatal outcomes associated with obstructive sleep apnea in obese pregnant women. Nasal continuous positive airway pressure reduces sleep-induced blood pressure increments in preeclampsia. Inspiratory flow limitation during sleep in pre-eclampsia: comparison with normal pregnant and nonpregnant women. Pre-eclampsia is associated with sleep-disordered breathing and endothelial dysfunction. Maternal and neonatal morbidities associated with obstructive sleep apnea complicating pregnancy. Prospective trial on obstructive sleep apnea in pregnancy and fetal heart rate monitoring. Pregnant women with gestational hypertension may have a high frequency of sleep disordered breathing. Obstructive sleep apnea and severe maternal-infant morbidity/mortality in the United States, 1998­2009. Maternal sleep-disordered breathing and adverse pregnancy outcomes: a systematic review and metaanalysis. Systematic review on sleep disorders and obstetric outcomes: scope of current knowledge. Pregnancy, sleep disordered breathing and treatment with nasal continuous positive airway pressure. However, the disease remains underdiagnosed despite the rising costs of healthcare that the lack of support can cause. In the future, epidemiological as well as interventional studies should be carried out in elderly patients, whose number will increase hugely in the coming years. From a medical point of view, a greater effort has been taken to maximise the health and functional ability of older people to achieve "active ageing". The latter is a clinical entity characterised by repeated pharyngeal collapse during sleep, inducing apnoea, decreasing oxygen saturation and increasing arterial carbon dioxide tension.

The appropriate decision about the optimal treatment timing and approach medicine 0829085 cordarone 100mg purchase overnight delivery, surgical or endovascular medications blood thinners purchase generic cordarone, should be taken based on a multidisciplinary management of such patients symptoms 10 dpo cordarone 200 mg visa. The presence of multiple or diffuse feeding vessels to the fistula is a frequent and characteristic feature of congenital lesions medications by class cheap cordarone 200 mg buy online. Transarterial embolization is a minimally invasive medications used to treat adhd discount cordarone uk, effective, and safe therapy that allows resolution of the pathology with a shorter hospital stay and decreased morbidity. It is the treatment of choice among other options, such as surgical ligation of the involved hepatic artery, partial hepatectomy, portocaval shunt, and liver transplantation. The severity of the symptoms is proportional to the size of the fistula and the flow within it. The fistula progressively decreases and then reverses the normal antegrade flow in the portal vein while the hepatic artery flow, and diameter, increase due to the fact that arterial flow directly communicates with a territory of low pressure. This hemodynamic alteration also produces a decrease in blood flow distal to the fistula in the abdominal aorta beyond the celiac trunk (aortic tapering). Some authors have suggested that this steal effect compromises perfusion of the superior and inferior mesenteric circulations, producing bowel hypoxia, thus worsening intestinal edema. In these same series, the most important findings on physical examination at diagnosis were splenomegaly, hepatomegaly, ascites, and edema. The variable clinical presentation might be related to variations in the angioarchitecture, size of the fistula, flow within the malformation, and, consequently, the degree of portal hypertension. This seems to be related to the protective effect of the hepatic sinusoids interposed between the fistula and the right heart cavities. The typical symptoms of chronic malabsorption, diarrhea, and abdominal pain are likely associated with mesenteric vascular congestion. Protein-losing enteropathy, steatorrhea, and malabsorption contribute to patient malnutrition and may be due to edema and dilation of the lymphatic system and pancreatic hypoperfusion. Transcatheter embolization of the fistula by means of endovascular techniques has been proposed as the first therapeutic option with a high success rate in patients with unilateral lesions or in those with few feeding arteries. However, in many series, more than one intervention has been necessary to achieve occlusion. Occasionally, after an apparently technically successful procedure, new collateral feeders not seen during the first intervention might appear and act as persistent anomalous arterial to portal connections keeping the fistula patent. In these patients, nonsurgical treatment is preferable because the success rate is not higher with surgery. Hepatic arteriovenous malformations may be focal or diffuse, and embolization is usually, but not always, an option due to the risk of hepatic ischemia and necrosis. Acrylic or polyvinyl alcohol microspheres have also been described in case small feeders are present. Microspheres larger than 500 µm should be used based on that this caliber is large enough to occlude the arterioportal connection, avoiding the risks of migration to the portal system and hepatic ischemia. This complication may be related to nontarget embolization, directly locating the embolic agent at the wrong site, or the material moving from the original site to the portal system because of high flow in the fistula. Another reason for this severe complication is related to sudden flow changes after embolization of the fistula. In our experience, after the intervention, for thrombosis prophylaxis, subcutaneous low-molecular-weight heparin was administered for 3 days once the end point (anti-Xa = 0. On the other hand, high-flow lesions are treated with superselective transarterial, direct, and transvenous access. Angiography and further endovascular techniques are only reserved for therapeutic purposes when medical treatment fails. Usually, we use undiluted contrast material; however, in patients weighing less than 10 kg, we often dilute 1:1 with saline. Particulated agents (gelfoam and 300 µm microparticles) are usually employed for this purpose. Then, endovascular or surgical treatment can be carried out, in one or two steps, depending on the test result. These techniques should be performed by specifically trained physicians, with knowledge of the pediatric pathology and experience in the management of the specific considerations related to this age group. A multidisciplinary discussion, management, and follow-up are essential for the continuous evolution of endovascular techniques in pediatrics. A step-by-step practical approach to imaging diagnosis and interventional radiologic therapy in vascular malformations. Classification, diagnosis, and interventional radiologic management of vascular malformations. Kaposiform hemangioendothelioma with Kasabach-Merritt phenomenon: successful treatment with embolization and vincristine in two newborns. Hepatic hemangiomas: subtype classification and development of a clinical practice algorithm and registry. Clinical and radiologic manifestations of congenital extrahepatic portosystemic shunts: a comprehensive review. Congenital portosystemic shunts in children: recognition, evaluation, and management. Endovascular treatment of congenital portal vein fistulas with the Amplatzer occlusion device. Improved neurocognitive function after radiologic closure of congenital portosystemic shunts. Resolution of hepatopulmonary syndrome after ligation of a portosystemic shunt in a pediatric patient with an Abernethy malformation. Presumed hypoplastic intrahepatic portal system due to patent ductus venosus: importance of direct occlusion test of ductus venosus under open laparotomy. Successful surgical ligation under intraoperative portal vein pressure monitoring of a large portosystemic shunt presenting as an intrapulmonary shunt: report of a case. Embolization of congenital intrahepatic porto-systemic shunt by n-butyl cyanoacrylate. Successful embolization using interlocking detachable coils for a congenital extrahepatic portosystemic venous shunt in a child. Transcatheter closure of patent ductus venosus with the Amplatzer vascular plug in twin brothers. Transcatheter closure of portalsystemic shunt combining congenital double extrahepatic inferior vena cava with vascular plug. The arterioportal fistula syndrome: clinicopathologic features, diagnosis, and therapy. Congenital, solitary, large, intrahepatic arterioportal fistula in a child: management and review of the literature. Dalfino The growing role that embolotherapy has been playing in medical care should be apparent to all practicing interventionalists. As embolization procedures continue to either replace or play an adjunctive role to existing medical and surgical therapy, it becomes incumbent on those performing these procedures to assume the role of a treating physician and to assume significant responsibility for the care of these patients. Physicians participating in an embolization service must have a complete working knowledge of the indications and contraindications for these procedures, the applicable vascular anatomy, the technical steps of the procedure, the embolic agent(s) and other equipment being used, the expected outcomes, and the potential complications and how these complications are best managed. This is a big task because embolization procedures are performed for various conditions falling under the domain of so many different medical specialties. In other words, the individual specializing in interventional oncology and spending much of his or her time performing procedures such as chemoembolization or radioembolization may not have the same degree of knowledge in the neuro or gynecologic applications of embolotherapy. The physicians performing these procedures must recognize these limitations if they are seeking to grow their practice into different areas. The technical skill-set and familiarity with embolic agents may be there, but a commitment must be made to the additional work required to claim the same degree of expertise as those regularly performing these procedures. For a successful embolization service to be in place within a hospital, interventionalists must make a true commitment to the care of these patients and the development of these procedures. Although it has been said frequently in recent years, no physician understands the role of and potential issues surrounding embolization procedures better than the person performing the embolization procedure. This fact alone should provide the justification for any interventionalist performing embolization procedures to be actively engaged in the longitudinal care of his or her patients. Embolization has become the primary therapeutic options for so many different conditions, and as such, it is just inappropriate for the physician providing a therapeutic service to not be a part of the preprocedure and postprocedure care of his or her patient. This continuity of care is of course good for patients because the person with the most expertise with the procedure is keeping an eye on them. It is not possible to have a preprocedure conversation with a patient regarding expected outcomes and potential risks if one does not personally provide follow-up care. Without a suitable amount of postprocedure experience, one can never gain the familiarity with outcomes and complications to enable this type of conversation to take place. Therefore, this becomes inappropriate care and will likely form the basis for others to become actively engaged in embolotherapy. All of this lends support to what is now becoming a mandatory clinical practice model for interventionalists performing embolization procedures. Interventional radiologists continue to be the specialists performing the largest volume of embolization procedures, but like so many areas under the heading of endovascular care, this is changing. A growing number of vascular surgeons, neurosurgeons, neurologists, and nephrologists are incorporating embolization into their procedural skill-set, and managing an entire episode of care is fundamental to their respective clinical practices. Although this is being increasingly recognized by interventional radiologists, there are some physicians who continue to either disagree with this model of practice or are not given the resources and/or support from their diagnostic radiology colleagues to become actively engaged in direct patient care. At some point, these physicians will have to make a decision regarding whether or not it is appropriate for them to continue performing these procedures. An increasing number of procedures are originating in the outpatient setting; therefore, an office must be available for an episode of care involving embolization to begin. The office is where patients are initially assessed and counseled, where arrangements are made for office or hospitalbased procedures, where billing originates from, and where patients are seen in follow-up after procedures are performed. Therefore, the core of an embolization service must take place in a dedicated office space in the community or hospital setting. The physical space for an outpatient office represents only one part of this effort when establishing an embolization service. Successful practices are built around practitioners and staff who fully understand and appreciate the nuances of these procedures. Nurse practitioners3 and physician assistants4 have been playing an integral role within interventional practices for the past several years and will continue to do so. It always helps patients to know that they have points of contact within a medical practice should they have questions or concerns, and physicians who are able to share this responsibility with others are more likely to bring success to their entire practice in this area. Additional aspects of an outpatient office range from the office staff such as nurses, receptionists, and billing personnel to the computer-based electronic medical records that are prevalent today. These services need to be in place to ensure appropriate communication with referring physicians, consulting services, hospitals, and third-party payers. This commonly involves reviewing medical records, radiologic images, lab work, and the notes from previous procedures. An infrastructure must therefore be in place to ensure that this information is available for review at the time of an initial consultation. A discussion must then take place to review the decision-making process for determining why a patient is a candidate for embolization and why that procedure is being recommended. The procedure should be reviewed in its entirety with the patient, especially if they may be only minimally sedated; they will likely be more comfortable if they know what is happening. Patients undergoing embolization often have the idea that a "procedure" such as embolization cannot possibly be associated with a difficult recovery period ("it is not surgery"). Although this may be true in some instances, the various chapters in this textbook clearly demonstrate that the recovery after some embolization procedures may be difficult for these patients and the families caring for them. The expected postprocedure symptoms, the duration of this recovery, and the ways to get in touch with staff at all hours of the day need to be reviewed with patients and their families. The final step in this preprocedure consultation is to be certain that patients understand not only the procedure but also the role that this procedure is playing in the overall management of their condition. For some patients, surgery may follow an embolization procedure, whereas for others, particularly in the area of interventional oncology, liver-directed therapy may be followed by surgical or medical therapy. Patients need to understand when embolization is a stand-alone treatment and when it is one step in a long process involving many treatment strategies offered by many different physicians. The same conversation should be had with the physician referring the patient to your service because they should also understand when additional therapy may or may not be required after embolization. It should be said here, though, that patients must feel that they are being treated by physicians who have and are comfortable with the knowledge and technical skill required to treat their condition successfully. Ensuring that patients have this type of confidence in their physician goes a long way toward increasing their comfort as they enter a procedure suite for their embolization procedure. No matter how confident patients are with their physicians, and no matter how eager they are to have this procedure performed, most patients will prefer to be adequately sedated throughout the course of an embolization procedure. Therefore, physicians actively participating in an embolization service and regularly performing these procedures must have a good understanding of the sedation needs in association with the procedure being performed and the sedation demands of the individual patient. Use of these medications will require appropriate monitoring of patients during and after the performance of the procedure. The risk of transient bacteremia after embolization has been historically demonstrated,5 which is why interventionalists participating in an embolization service should have an understanding regarding the use of prophylactic antibiotics before these procedures. Practice guidelines from the Society of Interventional Radiology have recommended the use of prophylactic antibiotics targeted against skin pathogens before solid organ embolization procedures involving the liver, kidney, or spleen, especially when there is a high likelihood of infarction; this includes chemoembolization procedures. Remember that there is rarely any visible manifestation of the procedure that was just performed. Most patients leave an interventional procedure area with nothing more than a Band-Aid as evidence that they underwent a procedure. There is no surgical incision closed with obvious attention on cosmetic healing to confirm the technical proficiency of the surgeon. Managing patients after an embolization procedure represents the real opportunity physicians have to demonstrate their caring and their expertise; it is what the patients will remember. Therefore, physicians must be certain that patients and their families are adequately counseled regarding the expected symptoms after embolization. In addition, an easy means of communication between patients and the physician practice must be established to address questions and/or concerns during this recovery period. Postembolization Syndrome the different applications of embolization are each associated with a unique set of postprocedural issues that need to be recognized and addressed by the treating physician. However, patients undergoing solid organ or solid tumor embolization typically experience a postembolization syndrome that has been well described in the literature.

Failure of one side of the heart puts a greater strain on the opposite side symptoms 7dp5dt generic cordarone 100 mg with mastercard, and eventually the whole heart fails medicine video buy discount cordarone 250 mg line. Blood circulates inside the blood vessels treatment quadratus lumborum buy cordarone 250mg without a prescription, which form a closed transport system medicine cabinets surface mount cheap cordarone online mastercard, the so-called vascular system medicine vs medication order cordarone paypal. The idea that blood circulates, or "makes rounds," through the body is only about 300 years old. The ancient Greeks believed that blood moved through the body like an ocean tide, first moving out from the heart and then ebbing back to it in the same vessels to get rid of its impurities in the lungs. It was not until the seventeenth century that William Harvey, an English physician, proved that blood did, in fact, move in circles. Like a system of roads, the vascular system has its freeways, secondary roads, and alleys. Blood then moves into successively smaller and smaller arteries and then into the arterioles (ar-tere- lz), which o feed the capillary (kap-lare) beds in the tisi sues. Capillary beds are drained by venules (venulz), which in turn empty into veins that finally empty into the great veins (venae cavae) entering the heart. Thus arteries, which carry blood away from the heart, and veins, which drain the tissues and return the blood to the heart, are simply conducting vessels-the freeways and secondary roads. Only the tiny hairlike capillaries, which extend and branch through the tissues and connect the smallest arteries (arterioles) to the smallest veins (venules), directly serve the needs of the body cells. The capillaries are the side streets or alleys that intimately intertwine among the body cells and provide access to individual "homes. For instance, we have seen that oxygen-poor blood is carried in the pulmonary trunk, an artery, while oxygen-rich blood is transported back to the heart in pulmonary veins. The tunica intima (tun-kah in-timah), i which lines the lumen, or interior, of the vessels, is a thin layer of endothelium (squamous epithelial cells) resting on a basement membrane. Its cells fit closely together and form a slick surface that decreases friction as blood flows through the vessel lumen. Some of the larger arteries have elastic laminae, sheets of elastic tissue, in addition to the scattered elastic fibers. The smooth muscle, which is controlled by the sympathetic nervous system, is active in changing the diameter of the vessels. Chapter 11: the Cardiovascular System 371 (a) Light photomicrograph of a muscular artery and the corresponding vein in cross section (853). Capillaries-between arteries and veins in the circulatory pathway-are composed only of the tunica intima. This layer is composed largely of fibrous connective tissue, and its function is basically to support and protect the vessels. Structural Differences in Arteries, Veins, and Capillaries the walls of arteries are usually much thicker than those of veins. When skeletal muscles contract and press against the flexible veins, the valves proximal to the area of contraction are forced open, and blood is squeezed toward the heart. The valves distal to the point of contraction are closed by the backflowing blood. Arteries, which are closer to the pumping action of the heart, must be able to expand as blood is forced into them and then recoil passively as the blood flows off into the circulation during diastole. Veins, in contrast, are far from the heart in the circulatory pathway, and the pressure in them tends to be low all the time. However, because the blood pressure in veins is usually too low to force the blood back to the heart, and because blood returning to the heart often flows against gravity, veins are modified to ensure that the amount of blood returning to the heart (venous return) equals the amount being pumped out of the heart (cardiac output) at any time. The lumens of veins tend to be much larger than those of corresponding arteries, and they tend to have a thinner tunica media but a thicker tunica externa. Then, pressing firmly, move your proximal finger along the vein toward your heart. As you can see, the vein remains collapsed in spite of gravity because your proximal finger pushed the blood past a valve. Finally, when we inhale, the drop in pressure that occurs in the thorax causes the large veins near the heart to expand and fill. The transparent walls of the capillaries are only one cell layer thick-just the tunica intima. Because of this exceptional thinness, exchanges are easily made between the blood and the tissue cells. The flow of blood from an arteriole to a venule-that is, through a capillary bed-is called microcirculation. The true capillaries number 10 to 100 per capillary bed, depending on the organ or tissues served. They usually branch off the proximal end of the shunt and return to the distal end, but occasionally they spring from the terminal arteriole and empty directly into the postcapillary venule. A cuff of smooth muscle fibers, called a precapillary sphincter, surrounds the root of each true capillary and acts as a valve to regulate the flow of blood into the capillary. Blood flowing Chapter 11: the Cardiovascular System 373 through a terminal arteriole may take one of two routes: through the true capillaries or through the shunt. When the precapillary sphincters are relaxed (open), blood flows through the true capillaries and takes part in exchanges with tissue cells. When the sphincters are contracted (closed), blood flows through the shunts and bypasses the tissue cells in that region. Q: Assume the capillary bed depicted here is in the biceps brachii muscle of your arm. What condition would the capillary bed be in (a or b) if you were doing push-ups at the gym The common factors are the pooling of blood in the feet and legs and inefficient venous return resulting from inactivity or pressure on the veins. In any case, the overworked valves give way, and the veins become twisted and dilated. A serious complication of varicose veins is thrombophlebitis (thrombo-fle-bitis), inflammation of a vein that results when a clot forms in a vessel with poor circulation. Because all venous blood must pass through the pulmonary circulation before traveling through the body tissues again, a common consequence of thrombophlebitis is clot detachment and pulmonary embolism, which is a life-threatening condition. True capillaries Terminal arteriole Postcapillary venule (a) Sphincters open; blood flows through true capillaries. It has a large, lopsided lumen, relatively thick tunica externa, and a relatively thin tunica media. How is the structure of capillaries related to their (For answers, see Appendix D. The vascular shunt bypasses the true capillaries when precapillary sphincters controlling blood entry into the true capillaries are constricted. Major Arteries of the Systemic Circulation the aorta is the largest artery of the body, and it is a truly splendid vessel. In adults, the aorta is about the size of a garden hose (with an internal diameter about equal to the diameter of your thumb) where it issues from the left ventricle of the heart. The major branches of the aorta and the organs they serve are listed next in sequence from the heart. In many cases the name of the artery tells you the body region or organs served (renal artery, brachial artery, and coronary artery) or the bone followed (femoral artery and ulnar artery). Arterial Branches of the Ascending Aorta · the only branches of the ascending aorta are the right (R. Arterial Branches of the Aortic Arch · the brachiocephalic (brake-o-se-falik) trunk (the first branch off the aortic arch) splits into the R. In the axilla, the subclavian artery becomes the axillary artery and then continues into the arm as the brachial artery, which supplies the arm. At the elbow, the brachial artery splits to form the radial and ulnar arteries, which serve the forearm. Arterial Branches of the Thoracic Aorta · the intercostal arteries (10 pairs) supply the muscles of the thorax wall. Other branches of the thoracic aorta supply the lungs (bronchial arteries), the esophagus (esophageal arteries), and the diaphragm (phrenic arteries). The unpaired superior mesenteric (mesenterik) artery supplies most of the small intestine and the first half of the large intestine, or colon. They are called the ovarian arteries in females (serving the ovaries) and the testicular arteries in males (serving the testes). The inferior mesenteric artery is a small, unpaired artery supplying the second half of the large intestine. Each divides into an internal iliac artery, which supplies the pelvic organs (bladder, rectum, and so on), and an external iliac artery, which enters the thigh, where it becomes the femoral artery. At the knee, the femoral artery becomes the popliteal artery, which then splits into the anterior and posterior tibial arteries, which supply the leg and foot. The anterior tibial artery terminates in the dorsalis pedis artery, which via the arcuate artery supplies the dorsum of the foot. Most deep veins follow the course of the major arteries, and with a few exceptions, the naming of these veins is identical to that of their companion arteries. Major systemic arteries branch off the aorta, whereas the veins converge on the venae cavae, which enter the right atrium of the heart. They unite to form the deep brachial vein, which drains the arm and empties into the axillary vein in the axillary region. The basilic and cephalic veins are joined at the anterior aspect of the elbow by the median cubital vein. The brachiocephalic veins join to form the superior vena cava, which enters the heart. They begin at the dorsal venous arch in the foot and travel up the medial aspect of the leg to empty into the femoral vein in the thigh. The common iliac veins join to form the inferior vena cava, which then ascends superiorly in the abdominal cavity. In what part of the body are the axillary, cephalic, (For answers, see Appendix D. The vessels of the pulmonary circulation are not illustrated, accounting for the incomplete appearance of the circulation from the heart. The internal carotid arteries, branches of the common carotid arteries, run through the neck and enter the skull through the temporal bone. Once inside the cranium, each divides into the anterior and middle cerebral arteries, which supply most of the cerebrum. The paired vertebral arteries pass upward from the subclavian arteries at the base of the neck. Nutrients and toxins picked up from capillaries in the stomach and intestine are transported to the liver for processing. From the liver sinusoids, the blood continues into the hepatic veins and inferior vena cava. The anterior and posterior blood supplies of the brain are united by small communicating arterial branches. The result is a complete circle of connecting blood vessels called either the cerebral arterial circle or the circle of Willis, which surrounds the base of the brain. The cerebral arterial circle protects the brain by providing more than one route for blood to reach brain tissue in case of a clot or impaired blood flow anywhere in the system. When you have just eaten, the hepatic portal blood contains large amounts of nutrients. Because the liver is a key body organ involved in maintaining the proper glucose, fat, and protein concentrations in the blood, this system "takes a detour" to ensure that the liver processes these substances before they enter the systemic circulation. As blood flows slowly through the liver, some of the nutrients are removed to be stored or processed in various ways for later release to the blood. Like the portal circulation that links the hypothalamus of the brain and the anterior pituitary gland (Chapter 9, p. The inferior mesenteric vein, draining the terminal part of the large intestine, drains into the splenic vein, which itself drains the spleen, pancreas, and the left side of the stomach. The splenic vein and superior mesenteric vein (which drains the small intestine and the first part of the colon) join to form the hepatic portal vein. Fetal Circulation Because the lungs and digestive system are not yet functioning in a fetus, all nutrient, excretory, and gas exchanges occur through the placenta. The umbilical arteries carry carbon dioxide and debris-laden blood from the fetus to the placenta. As blood flows superiorly toward the heart of the fetus, most of it bypasses the immature liver through the ductus venosus (duktus ve-nosus) and enters the inferior vena cava, which carries the blood to the right atrium of the heart. Because fetal lungs are nonfunctional and collapsed, two shunts see to it that they are almost entirely bypassed. Some of the blood entering the right atrium is shunted directly into the left atrium through the foramen ovale (fo-ramen o-vale), a flaplike opening in the interatrial septum. Blood that does manage to enter the right ventricle is pumped out the pulmonary trunk, where it meets a second shunt, the ductus arteriosus (ar-tereosus), a short vessel that connects the aorta and the pulmonary trunk. Because the collapsed lungs are a high-pressure area, blood tends to enter the systemic circulation through the ductus arteriosus. The aorta carries blood to the tissues of the fetal body and ultimately back to the placenta through the umbilical arteries. As blood stops flowing through the umbilical vessels, they become obliterated, and the circulatory pattern converts to that of an adult. Superficial temporal artery Facial artery Common carotid artery Brachial artery Did You Get lt Which vessel-the hepatic portal vein, hepatic vein, or hepatic artery-has the highest content of nutrients after a meal

First-degree burns are red and swollen but usually heal in 2­3 days; only epidermal damage symptoms xanax is prescribed for order on line cordarone. Second-degree burns damage the epidermis and some of the dermis; blisters appear but epithelial regeneration can occur symptoms juvenile diabetes generic cordarone 100mg buy online. They act as receptors treatment ulcer buy cordarone discount, determine blood type symptoms by dpo cordarone 100 mg purchase with mastercard, and play a role in cell-to-cell interactions treatment zoster ophthalmicus buy generic cordarone 100mg online. Peroxisomes detoxify a number of harmful toxic substances and disarm free radicals. The basis of centrioles is microtubules; that of microvilli is a core of actin filaments. The concentration gradient determines the direction that water and solutes move by diffusion. A channel protein is an opening formed by membrane proteins for diffusion of certain small solutes. A carrier protein undergoes shape changes that allow diffusion of a specific substance through the membrane. When it is replicated, each strand serves as a template to build a complementary strand. Mucous membranes line body cavities open to the exterior (respiratory, digestive, urinary, and reproductive organ cavities). Parietal pleura, visceral pleura, (lung), visceral pleura, parietal pleura, parietal pericardium, visceral pericardium, (heart). Spongy bone areas look like the cross-beams of a house with lots of space between the bone spicules. Bones will become thinner and weaker because osteoclasts are bone-destroying cells. All typical cervical vertebrae are small, have holes in their transverse processes, and a split spinous process. Lumbar vertebrae are large, blocklike vertebrae with a blunt spinous process that projects directly back. A false rib attaches indirectly (by the costal cartilage of a superior rib) or not at all. The appendicular skeleton allows for mobility and manipulation of the external environment. The female pelvis is broader, lighter, has a less acute pubic angle, a wider inlet and outlet, and shorter ischial spines. The material between the articulating bone ends, which is connective tissue fibers in fibrous joints and cartilage in cartilaginous joints. Lining a synovial joint capsule to provide a source of lubricating fluid in the joint. Cardiac cells are branching, typically uninucleate cells with less obvious striations but obvious junctions. Skeletal muscle movements can be very forceful and rapid, whereas smooth muscle movements tend to be slow and often rhythmic. The alignment of the bands on the myofilaments is responsible for the banding pattern in skeletal muscle cells. Oxygen deficit occurs when a person is not able to take in oxygen fast enough to keep his/her muscles supplied with all the oxygen they need when working vigorously. The various abdominal muscles run in different directions across the abdomen making the abdominal wall very strong. Exercise defers or reduces the natural loss in muscle mass and strength that occurs in old age. Questions and Multiple Choice Review Questions getting up quickly from a reclining position. The sympathetic nervous system, which regulates blood pressure, is less efficient in old age. Sensorineural deafness results from damage to neural structures involved in hearing (cochlear nerve, auditory region of the brain), whereas conductive deafness results from anything that prevents sound vibrations from reaching the cochlea (earwax, fusion of the ossicles, fluid in the middle ear). Dendrites conduct impulses toward the nerve cell body; the axon terminal releases neurotransmitters. An action potential is a current that is continuously regenerated along the length of the axon and does not die out. Chemically via the release of a neurotransmitter and binding of the neurotransmitter to the postsynaptic membrane. The cerebellum provides precise timing for skeletal muscle activity and helps control our balance and equilibrium. They are unable to regulate their body temperature until the hypothalamus matures. It is a hypotension caused by a rapid change in position, such as Review Questions 1. The blind spot contains no photoreceptors; it is the site where the optic nerve leaves the eyeball. Rods have a rodlike outer segment containing the photopigment, whereas cones have a shorter cone-shaped outer segment. Rods respond to low light conditions and produce black and white vision; cones need bright light and provide color vision. The optic nerves leave the eyeballs, and the medial half of the fibers of each optic nerve cross over to the opposite side, joining there with the fibers from the outside half of the opposite eye to form the optic tracts. Otoliths are tiny stones made of calcium salts that are located in the maculae of the vestibule. The endocrine system delivers its commands slowly via hormones carried by the blood. The nervous system uses rapid electrical messages that are much faster, allowing you to lift your foot off the glass more quickly. The target organ of a hormone is the specific cells or tissues that the hormone affects. Endocrine organs are stimulated by hormones, by chemicals other than hormones, and by the nervous system. Endocrine glands are ductless and they release their hormone products directly into the intercellular fluid. Questions and Multiple Choice Review Questions release their nonhormonal products to an epithelial surface via a duct. The posterior pituitary is a storage and releasing area for hormones sent to it by the hypothalamus. Calcitonin, produced by the parafollicular cells of the thyroid gland, reduces blood calcium levels. When we are stressed, both glucocorticoids (adrenal cortical hormones) and epinephrine and norepinephrine (adrenal medullary hormones) are produced in increased amounts. Thymosin programs the T lymphocytes, which essentially direct our immune responses. Growth hormone decline results in muscle atrophy; estrogen decline leads to osteoporosis. Lack of a nucleus; therefore, they cannot carry out transcription and translation to produce proteins (enzymes and others). The stem cell (megakaryocyte) undergoes mitosis many times, forming a large multinucleate cell, which then fragments into platelets. Inactivity, leading to blood pooling, and anything that roughens or damages the lining of a blood vessel (laceration, atherosclerosis, physical trauma). An antigen is a substance foreign to the body which activates and is attacked by the immune system. An antibody is a protein released by immune cells that binds with a specific antigen and inactivates it in some way. Fetal HbF has a greater ability to bind oxygen and binds it more strongly than adult HbA. Leukemia, pernicious anemia, and clotting disorders are particularly common in the elderly. The intrinsic conduction system of the heart coordinates the action of the heart chambers and causes the heart to beat faster than it would otherwise. Fever increases the heart rate because the rate of metabolism of the cardiac muscle increases. Blood pressure in veins is much lower than that in arteries because veins are farther along in the circulatory pathway. Capillaries are the exchange vessels between the blood and tissue cells, thus thin walls are desirable. The pulmonary circulation is much shorter and requires a less powerful pump than the systemic circulation does. Pulmonary arteries carry oxygendepleted/carbon dioxide­rich blood, whereas the pulmonary veins carry oxygen-rich/carbon dioxide­depleted blood. Radial artery at the wrist; femoral at the groin; common carotid at the 590 Appendix D: Answers to Did You Get It A self-antigen is a body protein, typically displayed in the plasma membrane, that is foreign to anyone but yourself. T lymphocytes mount the cellular response by activating B cells and cytotoxic T cells and stimulating the inflammatory response. Neutralization occurs when antibodies attach to viruses or bacterial toxins, thereby blocking the virus or toxin from injuring the body. T cells have to bind to both an antigenic particle and to a self-protein on the antigenpresenting cell. An overzealous immune response against an otherwise harmless substance that causes injury to the body. In anaphylactic shock, released histamine causes constriction of the bronchioles, sudden vasodilation, and fluid loss. Self-proteins that were not previously exposed to the immune system appear in the circulation, or foreign antigens that resemble self-antigens arouse antibodies that attack the self-antigens. Because the respiratory mucosa rests on thin-walled veins that warm the incoming air, mucus produced by the mucous glands moistens the air and traps dust and bacteria. Ciliated cells of the mucosa move the sheet of contaminated mucus away from the lungs and toward the throat for swallowing. To exchange gases between the external environment and the blood-oxygen in, carbon dioxide out. His left lung collapsed because the pressure in the intrapleural space (normally negative) became equal to atmospheric pressure. Cyanosis is a bluish cast to the skin and nails due to inadequate oxygenation of the blood. Lymphatic vessels pick up fluid and proteins leaked from the blood into the interstitial space. Lymphatic capillaries are blind-ended and not fed by arteries as blood capillaries are. They also have flaplike minivalves that make them more permeable than blood capillaries. Particularly large collections of lymph nodes occur in the axillary, inguinal, and cervical regions. The number of afferent lymphatic vessels entering the node is greater than the number of efferent vessels leaving the node at the hilum. They include intact membranes (mucosa, skin), inflammatory response, and several protective cell types and chemicals. Adaptive defenses must be programmed and specifically target particular pathogens or antigens. Questions and Multiple Choice Review Questions stomach, small intestine, large intestine, anus. They increase the surface area of the small intestine tremendously for nutrient absorption. Bile, secreted by the liver, acts as a detergent to mechanically break up large fat masses into smaller ones for enzymatic digestion. Digestion uses enzymes to break the chemical bonds of the food molecules and release the units. This is the voluntary stage in which the chewed food is pushed into the pharynx by the tongue. The main goal of segmentation is to mix the food thoroughly, though some propulsion occurs. Food went down the air passageway (trachea) instead of the digestive passage (esophagus). It provides fiber, which is important for moving feces along the colon and defecation. Fats are used in synthesis of myelin sheaths and of cellular membranes, and as body insulation. Because it clogs the pancreatic ducts so that pancreatic enzymes cannot reach the small intestine, cystic fibrosis impairs food digestion, and fat digestion is virtually stopped, resulting in fatty stools and an inability to absorb fat-soluble vitamins. When she lost weight, the amount of fat decreased and the kidneys fell to a lower position causing the ureter(s) to kink (ptosis) and inhibit urine flow. The peritubular capillaries receive the fluid, nutrients, and needed ions to be returned to the general circulation. The specific gravity of urine is higher because it contains more solutes than water 8. It allows the cavity of the bladder to be increased in volume to store more urine when necessary. Excreting nitrogenous wastes, maintaining acid-base, water, and electrolyte balance of the blood. Aldosterone increases sodium ion reabsorption by the kidney tubules, and water follows (if able). Osmoreceptors are in the brain (hypothalamus) and they respond to changing (increasing) solute content (osmolarity) of the blood.

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