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Patricia A. Several new antiretroviral drugs have recently been licensed for use in HIVinfected patients. These include drugs in two new classes: an integrase inhibitor raltegravir and a CCR5 co-receptor antagonist maraviroc. In addition, two new protease inhibitors, atazanavir and darunavir, which have activity against viruses resistant to other protease inhibitors, have come into clinical use. These clinical advances have required the development of novel assays and interpretation systems for detection of resistance to allow the laboratory monitoring of patients receiving these new therapies. Access to content on Oxford Academic is often provided through institutional subscriptions and purchases. If you are a member of an institution with an active account, you may be able to access content in one of the following ways:. Typically, access is provided across an institutional network to a range of IP addresses. 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Schema for the diagnosis and treatment of patients at risk of acute mesenteric ischemia. Emergency laparotomy may be justified without angiography when the clinical suggestion of bowel ischemia is high. Asterisk indicates that peritoneal signs are considered persistent if they are not relieved within 30 minutes of receiving a dose of tolazoline. Arch Intern Med. Acute mesenteric ischemia is a life-threatening vascular emergency that requires early diagnosis and intervention to adequately restore mesenteric blood flow and to prevent bowel necrosis and patient death. The underlying cause is varied, and the prognosis depends on the precise pathologic findings. Despite the progress in understanding the pathogenesis of mesenteric ischemia and the development of modern treatment modalities, acute mesenteric ischemia remains a diagnostic challenge for clinicians, and the delay in diagnosis contributes to the continued high mortality rate. Early diagnosis and prompt effective treatment are essential to improve the clinical outcome. The survival rate has not improved substantially during the past 70 years, and the major reason is the continued difficulty in recognizing the condition before bowel infarction occurs. Clinical presentation is nonspecific in most cases and can be characterized by an initial discrepancy between severe abdominal pain and minimal clinical findings. Physical examination does not reliably differentiate between ischemic and infarcted bowel. Complications such as ileus, peritonitis, pancreatitis, and gastrointestinal bleeding may also mask the initial signs and symptoms of AMI. The risk factors for AMI, and the clinical course, differ according to the underlying pathologic condition. The timely use of diagnostic and therapeutic methods to quickly restore blood flow is the key to reducing the high mortality rate associated with AMI. The physiologic characteristics of splanchnic blood flow are complex and incompletely understood. Multiple major elements interact to provide the intestinal tract with an appropriate share of the blood supply, including the intrinsic metabolic and myogenic and the extrinsic neural and humoral regulatory systems. Pressure-flow autoregulation, reactive hyperemia, and hypoxic vasodilation are considered intrinsic controls and are responsible for instantaneous fluctuations in splanchnic blood flow. In the metabolic theory, oxygen delivery rather than blood flow causes adaptive changes in splanchnic circulation. An imbalance between tissue oxygen supply and demand will raise the concentration of local metabolites eg, hydrogen, potassium, carbon dioxide, and adenosine , resulting in vasodilation and hyperemia. In contrast, the myogenic theory suggests that arteriolar tension receptors act to regulate vascular resistance in proportion to transmural pressure. An acute decrease in perfusion pressure is compensated for by a reduction in arteriolar wall tension, thereby maintaining splanchnic blood flow. Although various types of neural stimulation eg, vagal, cholinergic, histaminergic, and sympathetic can affect the gut, the adrenergic limb of the autonomic nervous system is the predominant and possibly the sole neural influence on splanchnic circulation. Numerous endogenous and exogenous humoral factors are capable of affecting the splanchnic circulation. Norepinephrine and high levels of epinephrine produce intense vasoconstriction through the stimulation of adrenergic receptors. Other pharmacologic compounds that decrease splanchnic blood flow include vasopressin, phenylephrine, and digoxin. Papaverine, adenosine, dobutamine, fenoldopam mesylate, and sodium nitroprusside are exogenous agents that increase mesenteric blood flow. In addition, various naturally occurring agents can serve as splanchnic vasodilators, including acetylcholine, histamine, nitric oxide, leukotrienes, thromboxane analogues, glucagon, and an assortment of gastrointestinal hormones. The effects of prostaglandins are variable. In summary, the splanchnic circulation is regulated by a complex array of physiologic and pharmacologic factors Table 1. Tissue damage due to alterations in mesenteric blood flow is often the result of cellular injury associated with reperfusion. The role of oxygen free radicals in reperfusion injury is demonstrated by the reduction of tissue damage in the presence of antioxidants, xanthine oxidase inhibitors, and free-radical scavenging substances. Polymorphonuclear leukocytes contain enzymes that reduce molecular oxygen to superoxide anions and produce hypochloric acid, providing an additional source of reactive oxygen metabolites. Epithelial cells may produce xanthine oxidase—derived oxidants and initiate the production of proinflammatory agents that attract polymorphonuclear leukocytes. The degree of reduction in blood flow that the bowel can tolerate without activating these reperfusion mechanisms is remarkable. When splanchnic blood flow is restored, oxygen extraction increases, providing relatively constant oxygen consumption over a wide range of blood flow rates. Acute mesenteric ischemia can be categorized into 4 specific types based on its cause Table 2. Myocardial ischemia or infarction, atrial tachyarrhythmias, endocarditis, cardiomyopathies, ventricular aneurysms, and valvular disorders are risk factors for the development of mural thrombus, which can subsequently embolize to mesenteric arteries. Most visceral arterial emboli preferentially lodge in the superior mesenteric artery SMA because it emerges from the aorta at an oblique angle. The onset of symptoms is usually dramatic as a result of the poorly developed collateral circulation, and it is characterized by the abrupt onset of severe abdominal pain associated with diarrhea, which may become bloody. Frequently, the diagnosis of SMA embolism can be made intraoperatively based on the distribution of ischemic bowel. Because most SMA emboli lodge distally to the origin of the middle colic artery, allowing the inferior pancreaticoduodenal branches to be perfused, the proximal jejunum is spared, whereas the rest of the small bowel is ischemic or infarcted. Bowel ischemia or infarction ensues when the last remaining visceral artery or an important collateral artery occludes. The extent of bowel ischemia or infarction is typically greater than that with embolism, extending from the duodenum to the transverse colon. Splanchnic vasoconstriction in response to hypovolemia, decreased cardiac output, hypotension, or vasopressors best explain the difference between this entity and other forms of AMI. The resultant low-flow state causes intestinal hypoxia and necrosis. Endogenous and exogenous vasoconstrictors, disseminated intravascular coagulation, and reperfusion injury may also contribute. Vasoactive drugs, particularly digoxin, have been implicated in the pathogenesis of NOMI. Digitalis preparations induce contraction of splanchnic venous and arterial vascular smooth muscle in vitro and in vivo. Conditions predisposing to NOMI include age older than 50 years, myocardial infarction, congestive heart failure, aortic insufficiency, cardiopulmonary bypass, renal or hepatic disease, and major abdominal or cardiovascular surgery. However, patients may not have any clear risk factors. With increasing use of afterload-reducing agents and vasodilators, the mortality rate associated with NOMI has declined. An unusual form of nonocclusive ischemia has been described in patients who have undergone the stress of a surgical procedure or trauma and are receiving enteral nutrition in intensive care units. The proposed mechanism is an imbalance between demand created by the enteral feedings and supply decreased by systemic hypoperfusion and mesenteric vasoconstriction. Most patients manifest signs of sepsis, with abdominal distention as a late clinical sign. In the past, most cases were thought to be secondary to other intra-abdominal pathologic conditions such as malignancy, intra-abdominal sepsis, or pancreatitis or were classified as idiopathic. Mesenteric venous thrombosis is usually segmental, with edema and hemorrhage of the bowel wall and focal sloughing of the mucosa. Thrombi usually originate in the venous arcades and propagate to involve the arcuate channels. Hemorrhagic infarctions occur when the intramural vessels are occluded. The thrombus is usually palpable in the superior mesenteric vein. The transition from normal to ischemic intestine is more gradual with venous embolism than with arterial embolism or thrombosis. Mortality depends on the type of MVT acute vs chronic and the extent of venous involvement. Many of the signs and symptoms associated with AMI are common to other intra-abdominal pathologic conditions, such as pancreatitis, acute diverticulitis, small-bowel obstruction, and acute cholecystitis. In addition, the clinical presentation often depends on the underlying pathologic abnormalities. In general, patients with SMA embolism or thrombosis have an acute onset of symptoms and a rapid deterioration in their clinical condition, whereas those with NOMI or MVT have a more gradual onset and a more protracted clinical course. With SMA embolism, the onset of symptoms is usually dramatic because of lack of collateral circulation, and it manifests as severe and unrelenting abdominal pain, nausea, vomiting, and urgent bowel evacuation. Classically, the severity of abdominal pain is out of proportion to the physical findings. Dehydration and excessive fluid loss from third-spacing of fluid lead to mental confusion, tachycardia, tachypnea, and circulatory collapse. Laboratory findings include metabolic acidosis with elevated anion gap and lactate levels, leukocytosis, and hemoconcentration. Patients with SMA thrombosis frequently report a prodromal symptom complex of postprandial pain, nausea, and weight loss associated with chronic intestinal insufficiency. Nonocclusive mesenteric ischemia occurs most frequently in elderly, critically ill patients and in those with severe mesenteric atherosclerosis in the setting of an acute hemodynamic insult. Such patients are often intubated and sedated and, therefore, are unable to alert the clinician to their symptoms. In these circumstances, the intestinal ischemia may not become clinically evident until hours or days after the initial hemodynamic insult. The hemodynamic insult and its treatment predispose the patient to NOMI. These patients frequently experience unexplained worsening in their clinical condition or a failure to thrive or to follow their anticipated recovery course. Except in the most fulminant cases, patients with MVT typically present late ie, weeks after onset , complaining of diffuse, nonspecific abdominal pain associated with anorexia and diarrhea. If the pain is localized, it is most often in the lower quadrants. Compared with arterial thrombosis, MVT generates fewer prodromal symptoms with eating or postprandial pain. Fever, abdominal distention, and Hemoccult-positive stool samples are the most common findings. Bloody ascites and large fluid losses with third-spacing may occur, leading to dehydration and hypotension, causing further propagation of the venous thrombosis and worsening of the mesenteric ischemia. The final common pathway of all the specific causes of mesenteric ischemia is bowel infarction. When infarction occurs, the patient has peritoneal signs, hemodynamic instability, and signs of sepsis with multiorgan failure. Because AMI may proceed to fatal intestinal infarction rapidly, prompt diagnosis and treatment are paramount. A high index of suspicion in the setting of a compatible history and physical examination serves as the cornerstone to early diagnosis of mesenteric ischemia. Acute mesenteric ischemia should particularly be considered in the differential diagnosis when a patient is older than 60 years; has a history of atrial fibrillation, recent myocardial infarction, congestive heart failure, arterial emboli, or postprandial abdominal pain and weight loss; and is initially seen for abdominal pain that is out of proportion to that suggested by physical examination. The most common laboratory abnormalities are hemoconcentration, leukocytosis, and metabolic acidosis, with high anion gap and lactate concentrations. High levels of serum amylase, aspartate aminotransferase, lactate dehydrogenase, and creatine phosphokinase are frequently observed at presentation, but none is sufficiently sensitive or specific to be diagnostic. Hyperphosphatemia and hyperkalemia are usually late signs and are frequently associated with bowel infarction. The findings on a plain abdominal radiograph in AMI are also nonspecific. Air in the portal vein is a late finding and is associated with a poor prognosis. Barium enema has no place in the diagnosis of AMI. The introduction of barium and air may increase intraluminal pressure, causing reduced perfusion to the bowel wall, translocation of bacteria, and, potentially, perforation. In addition, the presence of barium may compromise subsequent diagnostic tests, such as computed tomography CT and angiography. Rarely, the barium enema can be useful in the diagnosis of colonic ischemia, but it has essentially been replaced by flexible sigmoidoscopy or colonoscopy. Recent interest in CT for the diagnosis of AMI has resulted in several studies describing thickened bowel walls, intramural hematoma, dilated fluid-filled bowel loops, engorgement of mesenteric vessels, pneumatosis, mesenteric or portal venous gas, infarction of other viscera, and arterial or venous thrombus. In the absence of a clinical indication for emergency laparotomy, mesenteric angiography remains the investigation of choice in suspected AMI. Early angiography has been shown to improve survival rates. Angiography must be biplanar. Lateral aortography is better for visualizing the origins of major visceral arteries that overlay the aorta in the anteroposterior plane. Mesenteric angiography can usually differentiate embolic from thrombotic arterial occlusions. Emboli usually lodge where the artery tapers, which is just after the first major branch of the SMA—the middle colic artery. In contrast, thrombotic disease usually involves the origin of the SMA. Thrombotic cases may be characterized by a complete lack of visualization of the SMA origin on the lateral aortogram, with delayed anteroposterior views showing prominent collateral vessels. Mesenteric venous thrombosis is characterized by a generalized slowing of arterial flow up to 20 seconds in conjunction with lack of opacification of the corresponding mesenteric or portal venous outflow tracts. This is usually segmental, in contrast to NOMI, which is diffuse and shows normal venous runoff. In addition, NOMI characteristically shows narrowing and multiple irregularities of the major SMA tributaries, the 'string of sausages' sign. Various other diagnostic methods and approaches have been used in the evaluation of AMI, but their use is limited by their low negative predictive value. Clinicians must be aware that undue delay caused by insensitive and nonspecific diagnostic techniques may worsen patient outcome. Endoscopy has been used to diagnose ischemic colitis; however, it does not visualize much of the small bowel, which is frequently involved in AMI. In addition, endoscopy may not have adequate sensitivity and specificity in detecting ischemic changes rather than infarction. Although peritoneal fluid analysis may yield abnormal results elevated white blood cell counts and phosphate, lactate dehydrogenase, and lactate levels in mesenteric ischemia, its role in the diagnosis of AMI is neither well studied nor widely accepted. Peritoneoscopy may also be a useful tool for investigating AMI due to venous thrombosis. Once the diagnosis of AMI is made, treatment should be initiated without delay. This should include active resuscitation and treatment of the underlying condition, with efforts directed toward reducing the associated vasospasm, preventing propagation of the intravascular clotting process, and minimizing the reperfusion injury. An algorithm summarizing treatment procedures is shown in Figure 1. Intravenous fluid resuscitation with crystalloids and blood products should be started promptly to correct the volume deficit and metabolic derangement. Placement of a Swan-Ganz catheter may be required for judicious fluid resuscitation and hemodynamic monitoring, especially in critically ill patients. Supranormalization of hemodynamic values has been attempted, with equivocal results, and it remains to be proven whether such an approach offers an advantage to patients with AMI. If there are no contraindications to anticoagulation, therapeutic intravenous heparin sodium should be administered to maintain the activated partial thromboplastin time at twice the normal value. After the patient's hemodynamic condition has been optimized and anticoagulation therapy has been initiated, efforts should aim at reducing the mesenteric vasospasm. When angiography is used to establish the diagnosis, the angiographic catheter should be left in the SMA for infusions of papaverine or other vasodilators. Papaverine, a phosphodiesterase inhibitor, increases mesenteric blood flow to marginally perfused tissues and may considerably improve bowel salvage. Papaverine use is recommended in cases of arterial embolic or nonocclusive disease because in both conditions the arterial vasospasm persists even after successful treatment of the precipitating event. The presence of peritoneal signs generally indicates bowel infarction rather than ischemia alone and mandates emergency laparotomy. Even in the absence of bowel necrosis, surgical procedures are generally required, except in NOMI, in which the management is primarily medical. Therapeutic improvement during preoperative resuscitation may offer a false sense of security, but bowel infarction, sepsis, and multiple organ failure usually follow unless laparotomy, revascularization, and excision of infarcted bowel segments are performed. Visceral revascularization embolectomy, thrombectomy, endarterectomy, or bypass should precede bowel resection in almost all patients with occlusive AMI. For acute mesenteric embolism, a standard embolectomy via a transverse arteriotomy in the proximal SMA should be performed. If the cause of an acute mesenteric embolism is in doubt or if SMA thrombosis is suspected, then a longitudinal arteriotomy is preferred. With this approach, if a bypass is necessary, the longitudinal arteriotomy can be used as the site for the distal bypass graft anastomosis. If flow is adequately restored without a bypass, then the longitudinal arteriotomy can be closed by patch angioplasty to ensure that the luminal diameter is not compromised. For AMI from arterial thrombosis due to atherosclerotic disease, a vascular bypass graft is usually necessary. The graft can originate from the infrarenal or supraceliac aorta. To avoid potential intra-abdominal contamination from perforated, infarcted bowel, revascularization should be performed using an autologous vein. As in embolic disease, revascularization should be performed first, with subsequent resection of clearly nonviable bowel. This allows preservation of potentially viable gut and reduces the possibility of creating a 'short-gut syndrome. Although nonspecific, the presence of arterial pulsations and the return of bowel peristalsis and normal bowel color suggest intestinal viability. Visual examination of the exterior of the bowel is unreliable, especially in cases of NOMI, in which the serosa may appear viable despite the presence of infarcted mucosa. The use of intravenous fluorescein and inspection under a Wood lamp has been shown to be more sensitive and specific, but this method is not widely accepted. Patchy uptake suggests questionable bowel viability, and these segments are better left in situ, with a plan for a 'second-look' operation. Doppler ultrasonography is an alternative and may be used intraoperatively, but studies have not demonstrated any advantage over clinical judgment in assessment of bowel viability. Effective treatment of NOMI largely depends on the underlying cause. Initial therapy should aim at removing the offending stimulus and correcting the underlying medical condition. Logically, any infarcted bowel must be resected. Vasodilators, anticoagulation, and mesenteric regional blockade have been used in cases in which infarction has not yet occurred. Occasionally, direct transcatheter infusion of papaverine into the SMA restores normal blood flow within minutes. However, patients with NOMI have fewer treatment options than those with other forms of AMI because the offending stimulus often originates from the necessary treatment of another disorder. Treatment of MVT is somewhat controversial and depends on the extent of intestinal ischemia. Patients without evidence of bowel infarction often recover spontaneously without operative intervention, and many are treated with anticoagulation alone. The presence of peritoneal signs necessitates emergency laparotomy. Infarcted bowel should be widely resected. Postoperatively, recurrence and progression of thrombosis are common. Cases of successful treatment with intravascular thrombolytic agents have also been reported. After initial treatment of the acute event, the possibility of thrombophilia should be investigated. If a prothrombotic condition is detected, long-term warfarin therapy may be necessary. Even when the primary operation is successful, the intraoperative assessment of bowel viability is often inaccurate, and few reliable signs are available to detect persistent ischemia or developing infarction in the postoperative period. For this reason, a second-look laparotomy after 24 to 48 hours is usually recommended. Second-look laparoscopy has been advocated as a substitute for second-look laparotomy, but the reliability of this approach remains unproved. Postoperatively, patients treated for AMI are invariably critically ill. Metabolic acidosis and hyperkalemia should be aggressively corrected. Persistent acidosis, especially in the absence of renal failure, should raise concerns about ongoing uncorrected bowel ischemia or infarction. Adequate volume resuscitation is essential to avoid persistent mesenteric hypoperfusion. The mesenteric capillary leak syndrome after mesenteric revascularization is well recognized. Frequently, patients with this condition require 10 to 20 L of crystalloid resuscitation during the first 24 to 48 hours after surgery. After successful revascularization, efforts should be directed toward limiting any reperfusion injury that may cause progressive mesenteric ischemia or infarction. If the patient's hemodynamic condition allows, infusion of vasodilators should be considered intravenous glucagon or intra-arterial papaverine. The use of allopurinol, angiotensin-converting enzyme inhibitors, and other free oxygen scavengers may help reduce the reperfusion syndrome. Sepsis and multiple organ dysfunction syndromes occur in many patients with AMI. Recurrence is not uncommon, and it carries a poor prognosis. A small proportion of patients survive massive bowel resection and develop short-gut syndrome, requiring long-term total parenteral alimentation or small-bowel transplantation. Acute mesenteric ischemia is a challenging clinical problem with diverse causes, which often results in delayed diagnosis and treatment. A strong clinical suspicion and an aggressive approach should be adopted in dealing with this condition because the outcome crucially depends on rapid diagnosis and treatment. With better understanding of the pathogenesis of AMI and the availability of a range of diagnostic and interventional techniques and adjuvant pharmacotherapies, an improved outcome can be achieved. Corresponding author and reprints: W. View Large Download. Table 1. Clinical Features of Acute Mesenteric Ischemia. Postgrad Med J. Lock G Acute intestinal ischaemia. Best Pract Res Clin Gastroenterol. Br J Surg. Principles of Critical Care. Can J Surg. Dig Dis Sci. Curr Opin Cardiol. Miller TAed. Physiol Res. Acta Pharmacol Toxicol Copenh. Crit Care Med. Am J Physiol. Captopril increases endothelin serum concentrations and preserves intestinal mucosa after mesenteric ischemia-reperfusion injury. Res Exp Med Berl. J Pharmacol Exp Ther. Surg Gynecol Obstet. Mansour MA Management of acute mesenteric ischemia. Arch Surg. Am J Surg. Rutherford RBed. Vascular Surgery. Mesenteric venous thrombosis: still a lethal disease in the s. J Vasc Surg. Schuler JJ Acute mesenteric ischemia. Cameron JLed. Current Surgical Therapy. Surg Clin North Am. Radiol Clin North Am. Eur J Radiol. Aust N Z J Surg. Eur J Vasc Surg. J Ultrasound Med. Zwolak RM Can duplex ultrasound replace arteriography in screening for mesenteric ischemia? Semin Vasc Surg. N Engl J Med. Dis Colon Rectum. Ann Surg. Am Surg. J Vasc Interv Radiol. Sehgal MHaskel ZJ Use of transjugular intrahepatic portosystemic shunts during lytic therapy of extensive portal splenic and mesenteric venous thrombosis: long-term follow-up. Minerva Chir. Surg Laparosc Endosc Percutan Tech. J R Coll Surg Edinb. Save Preferences. Privacy Policy Terms of Use. This Issue. Citations View Metrics. X Facebook More LinkedIn. May 24, Andrew Oldenburg ; L. Louis Lau ; Thomas J. Rodenberg ; et al Hope J. Edmonds ; Charles D. Article Information. Pathophysiologic processes. Reperfusion injury. Arterial Embolism. Arterial Thrombosis. Nonocclusive Mesenteric Ischemia. Mesenteric Venous Thrombosis. Access your subscriptions. Access through your institution. Add or change institution. Free access to newly published articles. Purchase access. Rent article Rent this article from DeepDyve. Sign in to access free PDF. Save your search. Customize your interests. Create a personal account or sign in to:. Privacy Policy. Make a comment.

Sitges buying MDMA pills