Surgery
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The fate of the circulatory system in response to vascular injury is governed by a series of complex biochemical reactions involving cellular elements and plasma proteins. Alteration of this hemostatic balance can result in excessive bleeding or procoagulant complications. In the field of vascular surgery, modulation of this process can have severe implications with respect to the maintenance of vascular conduit patency by avoiding thromboembolic events and the prevention of excess bleeding in the operative setting. ⋯ This review addresses the management of blood loss in the setting of vascular surgery. In so doing, insight will be shed on the interdependence and manipulation of hemostatic events as they relate to surgery. Topics related to preoperative evaluation, surgical technique, monitoring, and pharmacologic manipulation will be discussed.
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Postoperative ileus is a transient cessation of bowel motility that occurs after bowel resection (BR). Alvimopan, a peripherally acting mu-opioid receptor antagonist accelerated gastrointestinal (GI) recovery in 5 randomized, double-blind, phase III postoperative ileus trials. ⋯ These post hoc analyses support that alvimopan (12 mg) accelerates GI recovery across various patient populations.
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Major medical advances occur during wartime because of the presence of a high concentration of overwhelming casualties and the resulting requirement for innovative solutions. Examples of these advances include the propagation of hospitals with sanitary conditions, the use of blood transfusions, dialysis, air transportation of casualties, and advancements in vascular reconstruction. ⋯ The approach to the injured soldier has involved every aspect of patient care to include prevention using body armor, hypotensive resuscitation, tourniquets, intravenous and topical hemostatic agents, and a proactive approach of aggressive correction of coagulopathy using blood products. These advances currently are being translated to civilian practice altering the care of the urban patient.
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Achieving and maintaining hemostasis in neurosurgical procedures is critical to the outcome. After trauma to the brain, a cascade of events initiated by tissue factor (TF) or thromboplastin results in a coagulation process that develops into an exaggerated fibrinolytic response, called disseminated intravascular coagulation (DIC). ⋯ Recombinant factor VIIa (rFVIIa) also is discussed, including its mechanism of action and use in neurosurgery. The ultra-early administration of rFVIIa also is covered, in both the military and the civilian settings.
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Anticoagulant therapy is challenging to modern surgical practice because it complicates risks of bleeding and the need for allogeneic blood transfusions. In an aging population, there is extensive use of antiplatelet agents, and patients present for operations receiving these agents. Hemostatic inhibitors are reviewed here, including anticoagulants, platelet inhibitors (clopidogrel), low-molecular-weight heparins, pentasaccharide (fondaparinux), and other factor Xa inhibitors. Agents used to manage bleeding, including aprotinin, lysine analogs, desmopressin, and recombinant factor VIIa, are discussed.