William Jagust MD

• Professor, Public Health and Neuroscience

https://publichealth.berkeley.edu/people/william-jagust/

Gestation stage-dependent intrauterine trophoblast cell invasion in the rat and mouse: novel endocrine phenotype and regulation arrhythmia with pain generic 12.5 mg microzide with amex. Expression of vascular endothelial growth factor receptors 1 arrhythmia qt prolongation buy microzide once a day, 2 and 3 in placentas from normal and complicated pregnancies blood pressure monitor cvs discount 12.5 mg microzide visa. Angiopoietin-1 and angiopoietin-2 activate trophoblast Tie-2 to promote growth and migration during placental development arrhythmia getting worse buy cheapest microzide and microzide. The regulation and localization of angiopoietin-1 blood pressure chart app cheap 25 mg microzide visa, -2, and their receptor Tie2 in normal and pathologic human placentae. Tie-2 and angiopoietin-2 expression at the fetal-maternal interface: a receptor ligand model for vascular remodelling. Endoglin regulates trophoblast differentiation along the invasive pathway in human placental villous explants. Decidual natural killer cell interactions with trophoblasts are impaired in pregnancies at increased risk of preeclampsia. Uterine artery Doppler flow velocity waveforms in the second trimester for the prediction of preeclampsia and fetal growth retardation. The frequency and severity of placental findings in women with preeclampsia are gestational age dependent. Doppler ultrasound of the uterine arteries: the importance of bilateral notching in the prediction of pre-eclampsia, placental abruption or delivery of a small-for-gestational-age baby. Hypertension produced by reduced uterine perfusion in pregnant rats is associated with increased soluble fms-like tyrosine kinase-1 expression. Hypertension in pregnancy: clinical-pathological correlations and remote prognosis. Plasma cellular fibronectin as a measure of endothelial involvement in preeclampsia and intrauterine growth retardation. High plasma cellular fibronectin levels correlate with biochemical and clinical features of preeclampsia but cannot be attributed to hypertension alone. Predictive value of plasma thrombomodulin in preeclampsia and gestational hypertension. A comparison of endothelium-dependent relaxation in omental and myometrial resistance arteries in pregnant and nonpregnant women. Preeclampsia selectively impairs endothelium-dependent relaxation and leads to oscillatory activity in small omental arteries. Sera from preeclamptic women specifically activate human umbilical vein endothelial cells in vitro: morphological and biochemical evidence. Elevated placental soluble vascular endothelial growth factor receptor-1 inhibits angiogenesis in preeclampsia. Second-trimester maternal serum placental growth factor and vascular endothelial growth factor for predicting severe, early-onset preeclampsia. Overexpression of the soluble vascular endothelial growth factor receptor in preeclamptic patients: pathophysiological consequences. Evidence supporting a role for blockade of the vascular endothelial growth factor system in the pathophysiology of preeclampsia. A novel human-specific soluble vascular endothelial growth factor receptor 1: cell-type-specific splicing and implications to vascular endothelial growth factor homeostasis and preeclampsia. Intronic polyadenylation signal sequences and alternate splicing generate human soluble Flt1 variants and regulate the abundance of soluble Flt1 in the placenta. Characterisation of syncytiotrophoblast vesicles in normal pregnancy and pre-eclampsia: expression of Flt-1 and endoglin. Transcriptionally active syncytial aggregates in the maternal circulation may contribute to circulating soluble fms-like tyrosine kinase 1 in preeclampsia. Preeclampsia is associated with the presence of transcriptionally active placental fragments in the maternal lung. The effect of over-expression of sFlt-1 on blood pressure and the occurrence of other manifestations of preeclampsia in unrestrained conscious pregnant mice. Effect of recombinant placental growth factor 2 on hypertension induced by full-length mouse soluble fms-like tyrosine kinase 1 adenoviral vector in pregnant mice. Preeclampsia pathogenesis: "triple a rating"-autoantibodies and antiangiogenic factors. Maternal serum soluble fms-like tyrosine kinase 1 concentrations are not increased in early pregnancy and decrease more slowly postpartum in women who develop preeclampsia. Vascular endothelial growth factor accelerates renal recovery in experimental thrombotic microangiopathy. Vascular endothelial growth factor enhances glomerular capillary repair and accelerates resolution of experimentally induced glomerulonephritis. Post-cyclosporinemediated hypertension and nephropathy: amelioration by vascular endothelial growth factor. Elevated vasoinhibins may contribute to endothelial cell dysfunction and low birth weight in preeclampsia. Urinary prolactin as a reliable marker for preeclampsia, its severity, and the occurrence of adverse pregnancy outcomes. Circulating endothelial progenitor cells during normal pregnancy and pre-eclampsia. Decrease and senescence of endothelial progenitor cells in patients with preeclampsia. Preeclampsia: a link between trophoblast dysregulation and an antiangiogenic state. Negative regulation of soluble Flt-1 and soluble endoglin release by heme oxygenase-1. Deficiency in catechol-O-methyltransferase and 2-methoxyoestradiol is associated with pre-eclampsia. New insights into the etiology of preeclampsia: identification of key elusive factors for the vascular complications. Transthyretin is dysregulated in preeclampsia, and its native form prevents the onset of disease in a preclinical mouse model. A preeclampsia-like syndrome characterized by reversible hypertension and proteinuria induced by the multitargeted kinase inhibitors sunitinib and sorafenib. Prospective study of placental angiogenic factors and maternal vascular function before and after preeclampsia and gestational hypertension. Endoglin is a component of the transforming growth factor-beta receptor system in human endothelial cells. Preeclampsiaeclampsia: clinical and neuroradiographic correlates and insights into the pathogenesis of hypertensive encephalopathy. Placental ischemia and soluble fms-like tyrosine kinase 1: cause or consequence of preeclampsia? Transforming growth factor-beta(1) restores antiplatelet function of endothelial cells exposed to anoxia-reoxygenation injury. Effect of growth factors on human vascular endothelial cell prostacyclin production. Clinical characterization and outcomes of preeclampsia with normal angiogenic profile. Twin pregnancy and the risk of preeclampsia: bigger placenta or relative ischemia? Reversible effects of oxygen partial pressure on genes associated with placental angiogenesis and differentiation in primary-term cytotrophoblast cell culture. Insulin resistance and alterations in angiogenesis: additive insults that may lead to preeclampsia. Long-term impact of reproductive factors on the risk of cervical, endometrial, ovarian and breast cancer. Angiogenic factors as diagnostic tests for preeclampsia: a performance comparison between two commercial immunoassays. Plasma concentrations of angiogenic/anti-angiogenic factors have prognostic value in women presenting with suspected preeclampsia to the obstetrical triage area: a prospective study. Maternal plasma concentrations of angiogenic/anti-angiogenic factors are of prognostic value in patients presenting to the obstetrical triage area with the suspicion of preeclampsia. Diagnostic accuracy of placental growth factor in women with suspected preeclampsia: a prospective multicenter study. Angiogenic factors and the risk of adverse outcomes in women with suspected preeclampsia. Angiogenic factors in superimposed preeclampsia: a longitudinal study of women with chronic hypertension during pregnancy. Differential diagnosis of preeclampsia: remember the soluble fms-like tyrosine kinase 1/placental growth factor ratio. Chronic kidney disease may be differentially diagnosed from preeclampsia by serum biomarkers. Pilot study of extracorporeal removal of soluble fms-like tyrosine kinase 1 in preeclampsia. Pravastatin attenuates hypertension, oxidative stress, and angiogenic imbalance in rat model of placental ischemia-induced hypertension. Chesley was aware of such associations too, and in his landmark study of the remote prognosis of eclamptics sought and demonstrated increased hyperglycemia in this population. Since then preeclampsia has been associated with increased insulin resistance, shown to have higher incidence in diabetic and obese women, and subject to scores of observations regarding dyslipidemia. The obesity epidemic, with half of women of reproductive age in the United States obese or overweight, has resulted in this disorder being the leading attributable risk for preeclampsia. The metabolic changes associated with obesity are likely to be related to this increased risk and are reviewed in this chapter. In some, but not all, cases of preeclampsia there is insufficient remodeling of the spiral arteries, resulting in reduced uteroplacental perfusion. Compromised uteroplacental perfusion is thought to lead to the release of signals (many unidentified), from the placenta into the maternal circulation, that target the maternal vascular endothelium. In women who develop preeclampsia, the effects include widespread evidence of inflammation and endothelial cell dysfunction. Failure of physiologic transformation of the spiral arteries may also be observed in patients with (1) fetal growth restriction without preeclampsia, (2) preterm labor and intact membranes,4 (3) preterm premature rupture of membranes,5 and occasionally (4) clinically uncomplicated pregnancies. Gestational diabetes7 and prepregnancy obesity8 are often associated with larger babies yet predispose to preeclampsia. Preeclampsia superimposed on chronic hypertension or diabetes mellitus confers a higher risk of poor perinatal outcome compared to preeclampsia alone. The metabolic syndrome (MetS), also known as syndrome X, or the insulin resistance syndrome, or Reaven syndrome, comprises a constellation of metabolic factors and physical conditions associated with increased risk of development of type 2 diabetes and cardiovascular disease. The chapter first overviews some of the ways in which the MetS is thought to promote cardiovascular disease. It then uses this as a platform to focus on evidence that the components of the MetS, particularly chronic insulin resistance, inflammation and dyslipidemia, contribute to maternal endothelial cell dysfunction and the preeclampsia syndrome. Perhaps diverging from conventional thinking, the review then extends this hypothesis to suggest that the MetS actually contributes to poor placental development, with maternal and placental processes then cooperating in a vicious circle of inflammation and endothelial dysfunction. In 1998, the World Health Organization Task Force on Diabetes identified insulin resistance as the dominant cause of the MetS. With growing evidence of a paramount role for obesity, however, the latter has assumed a more important position among diagnostic criteria. Indeed, obesity and physical inactivity are currently considered to be the driving forces behind the MetS, modulated by susceptibility factors including adipose tissue disorders, genetic factors, race, aging, and endocrine disorders. Comprehensive reviews are available on the subject of MetS and cardiovascular disease. People with the MetS are at roughly twice the risk of atherosclerotic cardiovascular disease compared to those without. Some developing countries experience the paradox of families in which the adults are overweight but the children are underweight, the latter potentially attributable to intrauterine growth restriction which may predispose to later-life obesity via acquisition of the "thrifty phenotype. Adipose tissue is pleiotropic and functions not just as a lipid storage depot but as an active endocrine organ that secretes an array of bioactive molecules called adipokines. It is interesting that the majority of these mediators seem to be produced more actively in adipose tissue from obese individuals; that is, the production is not greater simply because of more tissue but also because of predominant location of the tissue (visceral versus subcutaneous) and/or intrinsic differences in the adipocyte with obesity. Materials produced by visceral fat are drained directly to the liver where they can upregulate the hepatic production of acute-phase reactants and inflammatory cytokines. Although the information for preeclampsia is limited, there is an increased risk of preeclampsia determined by early pregnancy waist circumference, a surrogate for visceral fat. The normal physiologic response to pregnancy includes excursions into insulin resistance, dyslipidemia, and systemic inflammation. Preeclampsia (and obesity in pregnancy) is often an extreme of the pregnancy continuum with respect to insulin resistance, dyslipidemia and inflammatory cell activation. Renin-Angiotensin System Human adipose tissue expresses all components of the renin-angiotensin system. This redox-cycling can be fueled by oxidation of ascorbate (vitamin C) to ascorbate radical, which further decomposes to dehydroascorbate. Whether adipocyte hypertrophy or adipocyte hyperplasia, or both, occur in response to excess postprandial lipids and glucose depends upon the type of adipose tissue. Subcutaneous fat deposition occurs early in development of obesity, with visceral deposition of fat occurring only after subcutaneous capacity has been reached. Hypertrophy of adipocyte lipid droplets may underlie the endoplasmic reticulum stress and mitochondrial abnormalities that are central to the adverse effects of obesity. Pregnancy results in remarkable maternal metabolic adjustments that optimize nutrient availability for the growing fetal-placental unit. Two metabolic stages of pregnancy can be distinguished, the first roughly corresponding to the first two-thirds of pregnancy when fetal growth is limited and differentiation and organogenesis are dominant, and the second occurring during the last third of pregnancy when fetal and placental growth accelerate Table 7. Maternal metabolism is predominantly anabolic during the first two trimesters, with storage of a greater proportion of nutrients, as evidenced by accumulation of maternal fat mass.

A greater understanding of the most appropriate approach to re-warming blood pressure healthy range buy microzide 25mg free shipping, based on the clinical situation blood pressure is low discount microzide 12.5mg, means that cardiovascularly stable patients may be successfully treated with a combination of external and minimally invasive internal re-warming blood pressure chart symptoms 25 mg microzide otc. Therapeutic nihilism should be avoided ulterior motive synonym generic microzide 12.5mg buy online, though if hypothermia was preceded by a hypoxic event arrhythmia graphs 12.5mg microzide order mastercard, the outcome may be more guarded. Electrocardiographic Manifestations of Hypothermia Am J Emerg Med 2002; 20:314­26. Accidental hypothermia: Rewarming treatments, complications and outcomes from one university medical centre. Outcome of Survivors of Accidental Deep Hypothermia and Circulatory Arrest Treated with Extracorporeal Blood Warming. Outcome of drowned hypothermic children with cardiac arrest treated with cardiopulmonary bypass. Extracorporeal Circulation for Rewarming in Drowning and Near-Drowning Pediatric Patients. Full recovery of an avalanche victim with profound hypothermia and prolonged cardiac arrest treated by extracorporeal rewarming. The Bernese Hypothermia Algorithm: A consensus paper on in-hospital decision-making and treatment of patients in hypothermic cardiac arrest at an alpine level 1 trauma centre. Efficacy of portable and percutaneous cardiopulmonary bypass rewarming versus that of conventional internal rewarming for patients with accidental deep hypothermia. Closed thoracic cavity lavage in the treatment of severe hypothermia in human beings. Thoracic lavage in accidental hypothermia with cardiac arrest-report of a case and review of the literature. Successful Resuscitation From Cardiopulmonary Arrest Due to Profound Hypothermia Using Noninvasive Techniques. Cardiopulmonary Resuscitation During Severe Hypothermia in Pigs: Does Epinephrine or Vasopressin Increase Coronary Perfusion Pressure? Effects of epinephrine in a pig model of hypothermic cardiac arrest and closed-chest cardiopulmonary resuscitation combined with active rewarming. Defibrillation energy requirements and electrical heterogeneity during total body hypothermia. Advanced Cardiac Life Support and Defibrillation in Severe Hypothermic Cardiac Arrest. Cardiac arrest due to accidental hypothermia and prolonged cardiopulmonary resuscitation. Revival From Deep Hypothermia After 4 Hours of Cardiac Arrest Without the Use of Extracorporeal Circulation. Survival after 385min of cardiopulmonary resuscitation with extracorporeal membrane oxygenation and rewarming with haemodialysis for hypothermic cardiac arrest. Outcome from severe accidental hypothermia in Southern FinlandGЗцa 10-year review. Prognostic markers in patients with severe accidental hypothermia and cardiocirculatory arrest. Cold water submersion and cardiac arrest in treatment of severe hypothermia with cardiopulmonary bypass. He complains of a 1-hour history of central chest pain that radiates to his left arm. The pain is severe and the patient complains of shortness of breath as well as appearing sweaty and mildly agitated. He has no significant medical history to note, although he does admit to smoking 15 cigarettes per day. There is no familial history of cardiac disease and he is not taking any prescribed medications. On further questioning, he admits to recreational cocaine use at weekends and occasional cannabis use during the week. He denies taking any other illicit drugs and cannot reliably recall how much alcohol he has had to drink. On arrival, he is hypertensive with a blood pressure of 205/115 mmHg and tachycardic at a rate of 110/min. Cocaine hydrochloride is a white powder that is highly water-soluble and is readily absorbed across mucous membranes. It is often taken via the intranasal route, although it may be injected intravenously. As a result, it produces a sympathomimetic toxidrome in overdose but serotonin syndrome may also occur. The toxic dose of cocaine will depend on a number of factors including individual tolerance, route of administration, purity, and the presence of other drugs. Expert comment Emergency department staff should understand the legal framework governing the possession of, and potential to supply illegal drugs. Where a patient is found to be in possession of an illegal drug, he or she should be advised that possession is unlawful and asked to hand it over voluntarily to a member of clinical staff, who should then contact the police? Any illegal drugs should be placed in a sealed container that must be placed immediately in the Controlled Drug cupboard until a hospital pharmacist can safely collect it, and this should be witnessed and documented. The pharmacy department will then liaise with the local police, who will determine whether the drug should be destroyed or transferred to police care. The movement of the drugs must be clearly documented to ensure that the chain of evidence can be maintained. Unlike patients presenting with acute coronary syndrome, benzodiazepines in addition to nitrates are recommended as first-line agents in managing chest pain following cocaine use. No further control trials or meta-analyses have been conducted since this initial review. The evidence that nitrates improve coronary artery spasm in cocaine-induced chest pain in human subjects is attributed to a single cardiac catheterization study in patients pre-medicated with 5­10 mg oral diazepam. Interestingly, the magnitude of cocaine induced vasoconstriction was greatest in segments of artery affected by atherosclerotic disease, an effect which has been demonstrated in other studies. Chest patients with highpain at 10 minutes: risk cardiovascular difference in means = 3. Troponin I is a better marker of myocardial damage than other cardiac enzymes in cocaine-related myocardial infarction. Given the evidence in animal models, benzodiazepines should be considered as the initial agent of choice if agitation or other sympathetic symptoms are present. As previously seen, cocaine-induced coronary spasm can be more severe in those segments of the coronary artery affected by atherosclerosis. Calcium channel antagonists such as verapamil should be considered as second line treatment if there is no evidence of myocardial infarction. Case progression Intravenous access is obtained and bloods are taken for urea, electrolytes, creatinine, liver function tests, troponin, and a clotting screen. A chest radiograph is also performed which is essentially normal with no evidence of a pneumothorax. Cocaine is rapidly metabolized by hepatic esterases and plasma pseudocholinesterase. This metabolite has similar pharmacological effects to cocaine itself and is generally more toxic with a longer half-life of 2. Urinary drug screen testing remains the quickest and most reliable way to test for recent cocaine use. Cocaine is usually detectable in the urine unchanged a few hours after the last dose, but the metabolites may be present up to 48 hours later. To evaluate this particular clinical question, it is necessary to consider the effects of -blockers in two inter-related clinical circumstances; (1) in the setting of cocaine induced coronary artery vasoconstriction, and (2) cocaine induced systemic hypertension and tachycardia. The role of -blockers in the management of cocaine-induced chest pain is controversial. Answer Acute -blocker use may actually reduce the incidence of myocardial infarction and may not be as harmful as initially feared. On current evidence, propranolol should be avoided acutely, but drugs like labetalol and carvedilol with both and adrenergic blocking activity may have a role although this needs to be evaluated further. The use of -blockers following recent cocaine use has also been cited to worsen systemic hypertension and tachycardia. As we have already seen in the previous section, there is some evidence emerging to indicate that -blockers in the context of cocaine-induced coronary spasm may not be as harmful as previously thought and may actually be beneficial. In light of this, do -blockers actually worsen systemic parameters when administered to patients with cocaine intoxication? All patients were given intranasal cocaine, 2 mg/kg, and randomized to receive either intravenous saline (n = 6) or intravenous labetalol 0. Multivariate analysis demonstrated a reduced risk of myocardial infarction in patients treated with a -blocker (odds ratio 0. All patients were randomized to receive either intranasal saline (n = 15) or 2 mg/kg intranasal cocaine (n = 15). Patients from each group were then randomised to receive either 2 mg intracoronary propranolol or a saline push over 2 minutes Randomized, double-blind, placebo control trial Change in coronary blood flow and coronary vascular resistance An additional decrease in coronary sinus Small sample size in each group blood flow seen in patients given both cocaine and propranolol (100 ± 14 ml/ min, p < 0. Patients discharged on a -blocker had a significant reduction in cardiovascular death (hazard ratio 0. It is reasonable to consider administering short-acting drugs with combined - and -blocking properties to patients following cocaine use that remain tachycardic and hypertensive following treatment with nitrates and benzodiazepines. Learning point Treatment of cocaine induced cardiac arrhythmias Sinus tachycardia: parenteral diazepam Supraventricular tachycardia: best treated with diazepam in the first instance. The United Kingdom National Poisons Information Service does not recommend the use of verapamil in the presence of pulmonary oedema or acute myocardial infarction. Amiodarone is not as effective as it is a class 3 Vaughan William anti-arrhythmic. As a result, a broad complex tachycardia similar to that seen with a tricyclic antidepressant overdose may occur. Initial management is the same in both conditions: treat early by correcting the underlying metabolic acidosis with intravenous sodium bicarbonate and administer fluids. The patient does not complain of any further episodes of chest pain but a referral is made to the medical team for observations and ongoing management. Clinical question: Do all patients attending with resolved cocaine-induced chest pain following treatment with benzodiazepines and nitrates require acute admission? Not surprisingly, patients that present with cocaine-induced chest pain are just as likely to continue taking the drug after hospital evaluation and are more likely to have multivessel disease. A Final Word from the Expert Whilst many of these are recreational drug users that tend to be young and otherwise physically fit, this is by no means guaranteed. Ike Turner, for example, is said to have died from acute cocaine toxicity at the age of 76. As noted, the pathophysiological basis of cocaine-induced chest pain and myocardial infarction is primarily one of coronary vasospasm leading to reduced coronary blood flow and subsequent ischaemia. This is unlike the majority of myocardial infarctions, where atheroma leads to coronary occlusion, and it consequently requires a different treatment strategy, aimed at reducing coronary vascular spasm by reducing the sympathomimetic effects of cocaine and consequently increasing coronary blood flow. At present the use of serial cardiac biomarkers in these patients, such as troponin, determines the length of inpatient stay and need for further investigation and intervention. Further work would be required first, to create a validated risk-assessment methodology for this group of patients. Cocaine and alcohol interactions in humans, neuroendocine effects and cocaethylene metabolism. Management of Cocaine-Associated Chest Pain and Myocardial Infarction: American Heart Association Acute Cardiac Care Committee of the Council on Clinical Cardiology. Randomized, double-blind, placebo-controlled trial of diazepam, nitroglycerin, or both for treatment of patients with potential cocaineassociated acute coronary syndromes. A prospective, randomized,controlled trial of benzodiazepines and nitroglycerine or nitroglycerinealone in the treatment of cocaineassociated acute coronary syndromes. Acute cocaine intoxication in the conscious dog: studies on the mechanism of lethality. Comparison of labetalol, diazepam and haloperidol for the treatment of cocaine toxicity in a swine model. Midazolam selectively potentiates the A2A but not the A1-receptor-mediated effects of adenosine. Effect of cocaine on coronary artery dimensions in atherosclerotic coronary artery disease: enhanced vasoconstriction by betaadrenergic blockade. Nitroglycerin in the treatment of cocaine associated chest pain­ clinical safety and efficacy. A report of the American College of Cardiology/American Heart Association task force on practice guidelines. Cholinergic modulation of the coronary vasoconstriction induced by cocaine in conscious dogs. Potentiation of Cocaine-Induced Coronary Vasoconstriction by Beta-Adrenergic Blockade. Experience with esmolol for the treatment of cocaine-associated cardiovascular complications. Effects of labetalol on haemodynamic parameters and soluble biomarkers of inflammation in Acute Coronary Syndrome in patients with active cocaine use. Acute cardiac ischemia in patients with cocaineassociated complaints: results of a multicentre trial. Acute coronary syndrome and cocaine use: 8-year prevalence and in-hospital outcomes. Validation of a brief observation period for patients with cocaine associated chest pain. The Urinary Excretion of Cocaine and Metabolites in Humans: A Kinetic Analysis of Published Data. Serial changes in highly sensitive Troponin I assay and early detection of myocardial infarction.

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Anderson Cancer Center found that percutaneous gastrostomy tubes were utilized for palliation in 23% of small bowel obstructions in patients with advanced malignancy quitting high blood pressure medication generic microzide 12.5mg visa. In combination with other medical techniques arrhythmia chest pain cheap microzide 25mg amex, both open and percutaneous gastrostomy offers the possibility of intermittent oral intake heart attack chest pain buy genuine microzide on-line. Endoluminal wall stents have a high success rate for relief of symptoms (64% to 100%) in complete and incomplete colorectal obstructions blood pressure medication images purchase 12.5mg microzide mastercard,30 and in over 70% of upper intestinal malignant obstructions including gastric outlet arrhythmia interpretation practice generic microzide 25 mg without prescription, duodenal, and jejunal obstructions. Procedures are considered in the setting of persistent nausea, vomiting, eructation, and early satiety. They also may be considered when there is evidence of duodenal compression on radiographic or endoscopic evaluations. Although few centers have the technical expertise, endoscopic stents for gastric outlet obstruction may be quite successful (approximately 90%) with rare complications. If endoscopic stenting fails for the gastric outlet blockage or is unavailable, an open or laparoscopic bypass is warranted. There are several technical variations of a surgical bypass procedure (gastrojejunostomy), but the results are similar. For an unresectable gastric cancer, the laparoscopic technique has been shown to have less suppression of immune function, less pain, shorter hospital stays, lower postoperative morbidity, and earlier recovery of bowel movements than an open procedure. In comparison, if patients were not symptomatic but had evidence of impending obstruction, only about 40% had a poor outcome. Antrectomy along with gastrojejunostomy in the setting of unresectable pancreatic cancer has been shown to have excellent results until death in one small series. Finally, in the setting where a surgical biliary bypass is planned, there is some controversy as to whether a preemptive gastric bypass (gastrojejunostomy) in the asymptomatic patient is warranted. Because a late gastric obstruction occurs from 9% to 23%,39­41 a duodenal bypass should be considered at the time of biliary bypass, especially if the patient is of good performance status with limited disease (no or minimal metastasis). Hyperbilirubinemia may become symptomatic, leading to pruritus, bleeding diathesis, and liver failure. Patients need prompt relief of the biliary obstruction before embarking on any other palliative treatments. Two major treatment approaches are currently available: (1) surgical bypass and (2) stent management (via gastroenterology or interventional radiology). Although most patients receive stents, recurrence rates are higher and subsequent hospitalizations may be lower for patients who have surgical bypass. One approach is to perform endoscopic stent placement in patients considered to have short life spans with a limited potential for recurrent obstruction and to perform surgical bypass for patients with less aggressive tumors, longer expected life expectancy, or limited access to endoscopic expertise for treatment of recurrent obstruction. If urgent surgery is not realistic due to patient comorbidities, overall status, or operating room availability, a transhepatic drain placed by an interventional radiologist is indicated. If a laparoscopic exploration is first undertaken for a potentially resectable mass and metastatic disease is noted, it is reasonable to abort the procedure with the hope that a less morbid endoscopic stenting can be accomplished. Also, if endoscopic stenting fails or is unavailable, an open or laparoscopic bypass is warranted. If, at open exploration, the patient is found to be unresectable, it is reasonable to proceed with a surgical bypass. The overall morbidity of surgical bypass is almost 20%, and the recurrence rate is 0% to 15%. It can be a difficult problem to manage, and treatment may be determined by the extent of the ascites, the condition of patient, or etiology. Larger volumes of ascites can lead to discomfort, fullness, or respiratory problems. Alternative options should be considered if diuretics no longer are of benefit or if percutaneous aspirations become painful and frequent. Multiple agents have been used, and ascites can be controlled in 33% to 85% of patients. If the patient has a longer life span, more invasive techniques may be considered. Probably the simplest intervention is the insertion of permanent intraperitoneal drainage catheters. This will allow for the serial drainage of fluid by the patient or their caretaker. Catheters can be placed surgically or by the interventional radiology team via computed tomography49 or ultrasound guidance. The success rates for permanent intraperitoneal catheters functioning until death is quite high (90%). The major complications are obstruction and infection and are around 17%,50,51 although catheter sepsis has been reported to be 35%. Leakage has been reported to be alleviated by continuous drainage51 or a suture around the drain. Ascitic fluid travels from the peritoneal cavity into the venous circulation due to higher peritoneal pressures. Although the incidence of major complications may be less common than previously reported for peritoneovenous shunts, the overall complication rate can be quite high (14% to 51%). The advantage of the Denver shunt over the LeVeen shunt is that the Denver shunt has a pump to help the shunt remain patent (26% Denver versus 50% LeVeen shunt occlusion rates). In addition, this procedure can be performed laparoscopically in an attempt to minimize complications. In one report, 79% of patients did not have recurrence for the remainder of their life (median survival: 7. The morbidity, although low, suggests that this procedure is best utilized in settings of ascites refractory to less aggressive treatments. These are often directly related to tumors, but may be due to treatments such as surgical procedures. Primary cancers that frequently lead to wound problems include breast cancer, skin cancers, soft tissue sarcomas, or soft tissue manifestations of other cancers. Special consideration must be taken related to the primary tumor type, and interdisciplinary decision making is imperative. Finally, due to debilitation, patients may have pressure sores, which complicate their overall course and lead to suffering. The prevention of pressure sores, as well as other wounds, is of primary importance. Many wounds, especially related to radiation injury or in the severely malnourished, may not heal. Therefore, this should not be a goal of treatment, but focus should be on control of pain, odor, and mess. This may include local debridement as indicated to keep the wound as clean as possible. Although surgical options for wounds are limited, operative intervention has been reported in 38% and primarily involves incision and drainage or debridement. One example of a chronic wound problem is chest wall complications of breast tumors. Even in the terminally ill, chemotherapy, especially if the patient is chemo naпve, may have a role. Surgical resection, or toilet mastectomy, may be utilized in the setting of a fungating incurable breast cancer to remove the tumor with the intent of wound control. It is always important to know the previous treatments to better understand possible success. This will also help to identify the optimal reconstruction alternatives as well as the extent of resection that is possible. The surgical literature is not very helpful in directing the extent of resection, and this must be based on surgeon judgment. Reconstruction options include primary closure, skin grafts, and an omental flap with skin graft, musculocutaneous flaps, or free flaps. The major surgical complications that must be considered include infection, open wounds, and flap loss. In one small series, it was noted to be 73%,69 and 20% to 52% in some of the larger series. Importantly, if there is major local wound morbidity, this could have a profound effect on the patient for the remainder of his or her life. Related to amputation, there are multiple small reports that do indicate good to excellent palliation. These may include amputations, limb perfusions, and major head and neck resections. Although these options may seem quite radical in the setting of palliation, they may be reasonable solutions based on symptoms and if the patient can withstand a large procedure. There have been many reports concerning local wound care for tumor-related wounds. For example, controlling odor and seepage has been shown to lead to less isolation, greater comfort, and increased psychosocial wellbeing. Recognizing that a person is entering the imminently dying or terminal phase of their illness is critical to appropriate care planning, with a shift to comfort care. Palliative medicine providers in the hospital are an important resource to provide for care of the imminently dying by employing the best practices of end-of-life care from the home hospice setting, which are not routinely available in in-patient settings. Patients in their final days require careful symptom management, and families need support and coaching as death approaches. Preparing the Family for the Dying Process Patients and families are usually unaware of the changes that typically occur during the last hours of life and the actual moment of death. Health-care professionals should explain the expected changes in cognition and physical function before they occur in order to alleviate distress and to prevent panic. This is particularly useful for families planning a home death, or for those closely involved in institutional care. Bleeding may be related to superficial tumors such as recurrent breast, head and neck, or sarcomas. If surgery is indicated, the optimal surgical option will depend mainly on the location and reason for bleeding, along with the least morbid and most efficacious procedure possible. Nonsurgical options include radiation therapy, arterial embolization, and endoscopic procedures. Local excision may be considered, although this procedure may be technically difficult or not possible in this setting. Therefore, patients would likely be better served with nonsurgical attempts to stop bleeding, which can be highly efficacious. Again, the success of alternative approaches will be based on the availability and expertise at each institution. Finally, it is a well-known strategy in hospice care for a patient with a known massive bleeding risk but no optimal or indicated intervention for the patient and family to be prepared for this outcome with dark sheets and sedation. Dark sheets are recommended so that blood will be less visible and disturbing for the patient and family. Medication for sedation should be immediately available and provided in adequate doses if exsanguination is a potential complication of the cancer to mitigate distress for the patient at that time. The death rattle-a loud wet rattling respiration due to small amounts of secretions in the back of the throat-may be interpreted as dyspnea or choking by family members. Among the issues that are important to resolve, if not previously discussed, are preferences for location of care and for limits on invasive or aggressive resuscitative therapies that often are ineffective in a patient with end-stage disease. Communication between caregivers and patients/families is particularly important for seriously ill hospitalized patients in whom there is a considerable mismatch between what patients prefer and what treatments they actually receive. In general, the risks and consequences of hypoglycemia are greater than those of hyperglycemia in patients at the end of life; looser control of blood sugars is appropriate. Anticonvulsants are generally maintained; however, the need for the initial prescription should be scrutinized; ongoing treatment may not be needed if the anticonvulsant was started for neuropathic pain or seizure prophylaxis. Most medications can be stopped abruptly; however, certain medications should be gradually stopped (tapered) to prevent complications. As a general rule, this includes cardiovascular medications and those affecting the central nervous system. It is recommended that a comfort care order set or guide be used to formulate care plans to ensure that there are environmental orders for the comfort and support of both the patient and the family; nonpharmacological interventions such as fans; eye, mouth, and skin care; as well as orders for comfort medications such as an opioid, antipsychotic, anxiolytic in usually lower but frequent doses. The care order should also take into account that the oral and intravenous routes may not be practical during the dying process. In almost all cases, symptoms can be managed with sublingual, subcutaneous, or per rectal routes. As required drugs for common symptoms (including pain, dyspnea, nausea, delirium, anxiety, and noisy respiratory secretions) should be prescribed according to an agreed upon protocol. This ensures that needed medications are available for comfort care at any time, without the delay in obtaining an order. Providing care to actively dying patients presents unique challenges for the clinician. Palliation of symptoms in non-small-cell lung cancer: a study by the Yorkshire Regional Cancer Organisation Thoracic Group. Effects of oral morphine on breathlessness and exercise tolerance in patients with chronic obstructive pulmonary disease. The effects of morphine on dyspnea and ventilator function in elderly patients with advanced cancer: a randomized double-blind controlled trial. Report of the clinical protocol committee: development of randomized trials for malignant bowel obstruction. Comparison of octreotide and hyoscine butylbromide in controlling gastrointestinal symptoms due to malignant inoperable bowel obstruction. Systematic review and meta-analysis of corticosteroids for the resolution of malignant bowel obstruction in advanced gynecological and gastrointestinal cancer. Systematic review of surgery in malignant bowel obstruction in advanced gynecological and gastrointestinal cancer.

Because of these alterations in endovascular invasion pulse pressure 66 discount microzide 25 mg without prescription, the maternal vessels of preeclamptic patients do not undergo the complete spectrum of physiologic changes that normally occur heart attack feels like buy microzide 12.5mg fast delivery. By the end of the culture period blood pressure app microzide 25mg purchase without prescription, fetal cytotrophoblasts migrated into the Matrigel (Fm) pulse pressure test order generic microzide from india. Specifically arteria mesenterica inferior order microzide pills in toronto, in normal pregnancy cytotrophoblasts invade large-bore arterioles, where they are in contact with well-oxygenated maternal blood. Another important consideration is that placental blood flow changes dramatically during early pregnancy. During much of the first trimester there is little endovascular invasion, so maternal blood flow to the placenta is at a minimum. The oxygen pressures of the intervillous space (that is, at the uterine surface) and within the endometrium are estimated to be approximately 18 mm Hg and 40 mm Hg, respectively, at 8­10 weeks of gestation. Thus, as cytotrophoblasts invade the uterus during the first half of pregnancy, they encounter a steep, positive oxygen tension gradient. These observations, together with the results of our own experiments conducted on isolated cytotrophoblasts,35 suggested that oxygen tension might regulate cytotrophoblast proliferation and differentiation along the invasive pathway. As an in vitro model system for testing this hypothesis, we used organ cultures of anchoring villi explanted from early gestation (6­8-week) placentas onto an extracellular matrix substrate. Some of the anchoring villi were cultured for 72 hours in a standard tissue culture incubator (20% O2 or 98 mm Hg). Incorporation was detected in the cytoplasm, but not the nuclei, of syncytiotrophoblasts. Other anchoring villi were maintained in a hypoxic atmosphere (2% O2 or 14 mm Hg). Because cytotrophoblasts were the only cells that entered S phase, we also compared the ability of anchoring villus explants cultured under standard and hypoxic conditions to incorporate [3H]thymidine. In contrast, [3H]thymidine incorporation by explants cultured in a 6% O2 atmosphere (40 mm Hg) was no different than in control villi. Taken together, these results suggest that a hypoxic environment, comparable to that encountered by early gestation cytotrophoblasts in the intervillous space, stimulates the cells to enter S phase. To quantify this, we made serial sections of villus explants maintained in either 20% or 2% O2, and then counted the number of cells in columns. Under hypoxic culture conditions, the columns contained triple the number of cells present in columns maintained in 20% oxygen. These results indicate that hypoxia stimulates cytotrophoblasts in cell columns to proliferate. With regard to the G2 to M transition, we were particularly interested in their cyclin B expression, since threshold levels of this protein are required for cells to enter mitosis. Immunolocalization experiments confirmed that cyclin B was primarily expressed by cytotrophoblasts (not shown). Under standard tissue culture conditions, cytotrophoblasts migrated from the cell columns and modulated their expression of stage-specific antigens, as they do during uterine invasion in vivo. Hypoxia also reduced cytotrophoblast staining for human placental lactogen, another antigen that is expressed once the cells differentiate. These results suggest that hypoxia produces selective deficits in the ability of cytotrophoblasts to differentiate along the invasive pathway. The effects of oxygen tension on the proliferative capacity of cytotrophoblasts could help explain some of the interesting features of normal placental development. Before cytotrophoblast invasion of maternal vessels establishes the uteroplacental circulation (10 weeks), the conceptus is in a relatively hypoxic environment. During this period, placental mass increases much more rapidly than that of the embryo proper. In contrast, cytotrophoblasts in anchoring villus columns maintained in 2% O2 failed to express integrin 1, although constituents of the villus core continued to express this adhesion molecule (E). The effects of oxygen tension on cytotrophoblast differentiation/invasion could also have important implications. Relatively high oxygen tension promotes cytotrophoblast differentiation and could help explain why these cells extensively invade the arterial rather than the venous side of the uterine circulation. Conversely, if cytotrophoblasts do not gain access to an adequate supply of maternal arterial blood, their ability to differentiate into fully invasive cells may be impaired. We suggest that the latter scenario could be a contributing factor to pregnancy-associated diseases, such as preeclampsia, that are associated with abnormally shallow cytotrophoblast invasion and faulty differentiation, as evidenced by their inability to upregulate integrin 1 expression. Subsequent experiments tested the functional consequences for cytotrophoblast adhesion and invasion of expressing the particular adhesion receptors that were upregulated during cytotrophoblast differentiation. These molecules are of particular interest because of their regulated expression on endothelial cells during angiogenesis and their upregulation on some types of metastatic tumor cells. An antibody specific for the V5 complex stained the cytotrophoblast monolayer in chorionic villi. The syncytiotrophoblast layer, and cytotrophoblasts in cell columns and the placental bed, did not stain for V5. In contrast, antiV6 stained only those chorionic villus cytotrophoblasts that were at sites of column formation. The cytotrophoblast layer still in contact with basement membrane stained brightly, while the first layer of the cell column showed reduced staining. The rest of the cytotrophoblasts in chorionic villi, cytotrophoblasts in more distal regions of cell columns, and cytotrophoblasts within placental bed and vasculature did not stain for V6, documenting a specific association of this integrin with initiation of column formation. In yet a different pattern, staining for anti-V3 was weak or not detected on villus cytotrophoblasts or on cytotrophoblasts in the initial layers of cell columns. However, strong staining was detected on cytotrophoblasts within the uterine wall and vasculature. Thus, individual members of the V family, like those of the 1 family,38 are spatially regulated during cytotrophoblast differentiation. Of particular relevance is the observation that V3 integrin, whose expression on endothelial cells is stimulated by angiogenic factors, is prominent on cytotrophoblasts that have invaded the uterine wall and maternal vasculature. Since blocking V3 function suppresses endothelial migration during angiogenesis, we determined whether perturbing its interactions also affects cytotrophoblast invasion in vitro. Cytotrophoblast invasion was evaluated by counting cells and cellular processes that had invaded the Matrigel barrier and extended through the holes in the Transwell filters. Staining was strong on the surfaces of cytotrophoblasts in contact with one another and with the overlying syncytiotrophoblast layer, and was absent at the basal surface of cytotrophoblasts in contact with basement membrane. In cell columns, E-cadherin staining intensity was reduced on cytotrophoblasts near the uterine wall and on cytotrophoblasts within the decidua. This reduction in staining was particularly pronounced in second-trimester tissue. At this stage, E-cadherin staining was also very weak or undetectable on cytotrophoblasts that had colonized maternal blood vessels and on cytotrophoblasts in the surrounding myometrium. All locations of reduced E-cadherin staining were areas in which invasion is active during the first half of gestation. Interestingly, the staining intensity of E-cadherin was strong on cytotrophoblasts in all locations in term placentas, at which time cytotrophoblast invasive activity is poor. Taken together, these data are consistent with the idea that cytotrophoblasts transiently reduce E-cadherin function at times and places of their greatest invasive activity. Cadherin switching occurs frequently during embryonic development when significant morphogenetic events take place. We therefore stained sections of first- and second-trimester placental tissue with antibodies to other classical cadherins. Thus, cytotrophoblasts that invade the uterine wall and vasculature express a cadherin characteristic of endothelial cells. Taken together, these functional data suggest that as they differentiate, the cells modulate their cadherin repertoire to one that contributes to their increased invasiveness. These observations support our hypothesis that normal cytotrophoblasts undergo a comprehensive switch in phenotype so as to resemble the endothelial cells they replace during endovascular invasion. We hypothesize that this unusual phenomenon plays an important role in the process whereby these cells form vascular connections with the uterine vessels. Ultimately these connections are so extensive that the spiral arterioles become hybrid structures in which fetal cytotrophoblasts replace the maternal endothelium and much of the highly muscular tunica media. As a result, the diameter of the spiral arterioles increases dramatically, allowing blood flow to the placenta to keep pace with fetal growth. Circumstantial evidence suggests that several of the adhesion molecules whose expression we studied could play an important role in forming these novel vascular connections. V3 expression is upregulated on endothelial cells during angiogenesis by soluble factors that regulate this process. Thus, adhesion receptors that are upregulated as normal cytotrophoblasts differentiate/invade play vital roles in differentiation and expansion of the vasculature. When samples were matched for gestational age, fewer preeclamptic cytotrophoblast stem cells stained with an antibody that recognized integrin 5. In contrast, staining for 6 was much brighter in preeclamptic tissue and extended beyond the column to include cytotrophoblasts within the superficial decidua. Of greatest interest, staining for 3 was weak on cytotrophoblasts in all locations; cytotrophoblasts in the uterine wall of preeclamptic patients failed to show strong staining for 3, as did cytotrophoblasts that penetrated the spiral arterioles. Thus, in preeclampsia, differentiating/invading cytotrophoblasts retain expression of V6, which is transiently expressed in remodeling epithelium, and fail to upregulate V3, which is characteristic of angiogenic endothelium. Therefore, as was the case for integrin 1,7 our analyses of the expression of V-family members suggest that in preeclampsia, cytotrophoblasts start to differentiate along the invasive pathway but cannot complete this process. Interestingly, in preeclampsia cytotrophoblasts within the uterine wall tended to exist as large aggregates, rather than as smaller clusters and single cells, as is the case in normal pregnancy. This observation is in accord with the likelihood that E-cadherin mediates strong intercellular adhesion between cytotrophoblasts, as it does in all other normal epithelia examined. However, staining for this adhesion molecule was detected on maternal endothelium in the unmodified uterine vessels in preeclamptic placental bed biopsy specimens. The results summarized above raise the interesting possibility that the failure of preeclamptic cytotrophoblasts to express vascular-type adhesion molecules, as normal cytotrophoblasts do, impairs their ability to form connections with the uterine vessels. This failure ultimately limits the supply of maternal blood to the placenta and fetus, an effect thought to be closely linked to the pathophysiology of the disease. Such a failure would no doubt have important effects on the maintenance of vascular integrity at the maternal­fetal interface. Clearly, in preeclampsia undifferentiated cytotrophoblasts that fail to mimic the adhesion phenotype of endothelial cells are present in the termini of maternal spiral arterioles. Whether or not the observed defects are related to their propensity to undergo apoptosis is not yet known52 (reviewed in53). Whether their presence also affects the phenotype of maternal endothelium in deeper segments of the same vessels and/or is linked to the maternal endothelial pathology that is a hallmark of this disease remains to be investigated. Before conception the spiral arteries, the terminal branches of the uterine arteries, are typical small muscular vessels, and are richly innervated. In normal pregnancy the loss of muscle extends beyond the decidua into the inner third of the myometrium. In the non-pregnant state the spiral artery at the junction of the uterine mucosa ("endometrium" before conception, decidua in pregnancy) acts as a "functional sphincter" during menses. During normal pregnancy the depth of remodeling eliminates this functional sphincter and its constrictor responsiveness. In preeclampsia the net result of failed remodeling is failure of terminal spiral artery dilatation to occur. The depth of remodeling is also compromised and does not extend beyond the junction of decidua and myometrium, leaving the "functional sphincter" intact, resulting in major consequences. However, as has been elegantly pointed out by Graham Burton54 and colleagues this vascular dilatation is essentially confined to the terminal portion of the vessel and thus has minimal effect on perfusion. The major impact actually is upon the velocity of blood flow as it leaves the spiral artery. The increase in cardiac output and redistribution of blood that characterizes normal pregnancy would result in an enormous increase in the velocity of blood exiting the spiral artery (2­3 meters/second). The terminal dilatation of the spiral artery can be predicted to reduce blood flow velocity to 10 centimeters/second. The dramatically increased blood velocity with the failed modeling and consequent nondilated terminal arteries would be predicted to lead to damage to the chorionic villae that with a hemochorial placenta are in direct contact with maternal blood. The accelerated velocity of blood also reduces time for extraction of blood and nutrients from the intervillus blood. The maintenance of smooth muscle in the spiral arteries results in vessels, which, unlike the situation in normal pregnancy, remains responsive to external signals. The reduced depth of remodeling of the vessels in preeclampsia that does not extend beyond the decidua could be particularly relevant since this results in the maintenance of the "functional sphincter" at the junction of the decidua and myometrium in the spiral artery. The consequence of the maintenance of responsiveness in the unremodeled spiral arteries is an increased risk of intermittent reduction of blood flow to the intervillus space. This intermittent reduction would set the stage for a hypoxia reperfusion scenario with subsequent oxidative stress. Endoplasmic reticulum stress is a cellular mechanism to reduce protein synthesis in settings in which nutrient and oxygen delivery is not sufficient to fully process proteins. Oxidative stress and endoplasmic reticulum stress not only affect local placental function but also participate in signal generation leading to the systemic features of preeclampsia. Free radicals modify lipid structure and the altered structure and apoptosis increase the shedding of trophoblast fragments. The shedding is augmented by the increased velocity of intervillus blood flow through the unremodeled spiral arteries. Redman and Sargent have championed the idea that such fragments have the capacity to activate immune cells69 and perhaps directly injure endothelial cells (Chapter 8). In addition, inflammatory cells passing through the intervillus space, which is replete with free radicals, could also be activated.

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