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Query: UMLS:C0034065 (pulmonary embolism)
 14,979 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Acute complications of deep vein thrombosis (DVT) of the lower extremities include pulmonary embolism and venous ischemia. Delayed complications include a spectrum of debilitating symptoms referred to as postthrombotic syndrome (PST). Anticoagulation therapy is recognized as the mainstay of therapy in acute DVT. However, there are few data to suggest any major beneficial effect on PTS, which is thought to be mediated by valve damage and/or occlusive chronic thrombus and venous scarring. Endovascular catheter-directed thrombolysis techniques with pharmacologic thrombolytic agents, used alone or in combination with mechanical thrombectomy devices, have been proven highly effective in clearing acute DVT, which may allow the preservation of venous valve function and prevention of subsequent venous occlusive disease. Definitive management of underlying anatomic occlusive abnormalities can also be undertaken.
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PMID:Endovascular management of venous thrombotic and occlusive diseases of the lower extremities. 1268 98

To investigate the pathological changes in the heart induced by pulmonary embolism, 20 autopsy cases of pulmonary embolism and 10 control cases of acute death from traumatic injury were examined. Adding to the routine hematoxylin-eosin (HE) staining, immunostaining with CD68 pan-macrophage marker was performed on the specimens obtained from both right and left ventricular walls. The number of macrophages was counted semi-quantitatively in 100 random high-power fields (HPF). Although typical pathological findings of myocardial infarction was not observed in any of the cases, 16 of the 20 pulmonary embolism cases showed an increase in the number of macrophages, mainly in the right ventricular wall. Four cases showed massive macrophage infiltration in the entire right ventricular wall. It is speculated that ischemia due to pulmonary embolism may be connected to its pathogenesis.
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PMID:Right ventricular damage due to pulmonary embolism: examination of the number of infiltrating macrophages. 1285 Apr 10

Right ventricular dysfunction in hemodynamically stable patients with acute pulmonary embolism may be a harbinger of adverse outcomes and may potentially result in the early use of thrombolytic therapy. Risk stratification of these patients is an area of recent and intense investigation with a focus on the assessment of right ventricular function after the embolic event. Echocardiography has been used to identify right ventricular dysfunction but is potentially hampered by a number of limitations. With the onset of right ventricular dilation and possible ischemia in acute pulmonary embolism, elevated serum troponins may be an early and reliable marker of right ventricular dysfunction. In acute pulmonary embolism, both right ventricular dysfunction by echocardiogram and elevated troponin levels have been shown to predict an adverse outcome. Therefore, serum troponin levels should help stratify patients with submassive acute pulmonary embolism into a group in which aggressive medical or surgical intervention would be considered.
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PMID:Troponin levels as a guide to treatment of pulmonary embolism. 1290 6

Thromboembolic events are a major cause of morbidity in cancer patients and may be harbingers of occult malignancy. Trousseau's syndrome (TS) is probably the best known thromboembolic syndrome in the cancer patient, encompassing a variety of paraneoplastic thromboembolic disorders. These include spontaneous recurrent or migratory venous thromboses and arterial emboli caused by nonbacterial thrombotic endocarditis in a patient with malignancy. Although linked to almost all cancers, venous thromboembolism (VTE) is a terminal event in many cancers occurring in women, such as breast, uterine, and lung cancers (Monreal et al. Thrombosis and Haemostasis 1997;78:1316). Appropriate recognition of the syndrome is paramount because TS often requires careful medical surveillance and management. Significant complications of thromboembolic events in the cancer patient include limb ischemia and deep venous thrombosis/pulmonary embolism, which can cause devastating and permanent consequences. The rehabilitation management of these complications is reviewed, with an emphasis on diagnostic and therapeutic approaches in this patient population.
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PMID:Thromboembolic events in the cancer patient. 1450 61

The Japanese Society of Anesthesiologists (JSA) conducts an annual survey of life-threatening events in operating rooms (OR) in JSA Certified Training Hospitals (JSACTH) by sending and collecting confidential questionnaires. Etiologies of the incidents were divided into four categories: those totally attributable to anesthetic management (AM), those resulting from preoperative complications (PC), those resulting from intraoperative pathological events (IP) and those related to surgical procedures (SP). IP resulted from coronary ischemia not suspected preoperatively, arrhythmias, pulmonary embolism, and other conditions. Outcomes were judged on the 7th post-operative day. In the year 2002, questionnaires were sent to 844 JSACTHs, and a total of 1,461,020 cases of anesthesia were documented from 773 JSACTHs. Of these, 1,277,045 cases of anesthesia from 712 JSACTHs were available for analysis. Seven hundred thirty nine cardiac arrests (5.79 per 10,000 anesthetics) and 806 deaths (6.31 per 10,000 anesthetics) due to life-threatening events in the OR were reported. The incidence of cardiac arrest and mortality totally attributable to AM was 0.38 and 0.11 per 10,000 anesthetics. These values tended to decrease after 1994, except the mortality totally attributable to AM, which were almost at constant level during recent years. The summary of the study between 1999 and 2002 was as follows. Among 3,855,384 anesthetics, 2,443 cardiac arrests (6.34 per 10,000 anesthetics) and 2,638 deaths (6.85 per 10,000 anesthetics) due to life-threatening events in the OR were reported. PC, SP, IP and AM were responsible for 64.7, 23.9, 9.4, and 1.5% of deaths, respectively. The major cause of PC related deaths was preoperative hemorrhagic shock, followed by cardiovascular diseases such as myocardial ischemia and congestive heart failure. Excessive surgical bleeding comprised 70.2% of SP-related deaths. The major causes of IP-related death were myocardial ischemia, pulmonary embolism, and severe arrhythmias. The incidence of cardiac arrest and death totally attributable to AM was 0.47 and 0.10/10,000 anesthetics, respectively. Among patients with ASA-PS 1(E) and 2(E), AM-related deaths occurred at a rate of 0.04/10,000 anesthetics. Half of AM-induced deaths were caused by airway or ventilatory problems. Other causes of AM-related death were medication accidents and infusion/transfusion accidents. Considerable effort is required to reduce intraoperative life-threatening events caused by human error, hemorrhage, and cardiovascular diseases.
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PMID:[Annual mortality and morbidity in operating rooms during 2002 and summary of morbidity and mortality between 1999 and 2002 in Japan: a brief review]. 1507 89

Open surgical embolectomy may be life-saving in massive pulmonary embolism. Up to now there are no studies concerning the question whether the foramen ovale should be examined routinely during surgery and whether an open foramen ovale should be closed routinely in the same session. Even case reports regarding this question are missing. We report on a 74-year old female patient who developed pulmonary embolism due to deep venous thrombosis. Six days after successful surgical embolectomy the patient developed cardiogenic shock due to a huge thrombus from the right atrium through the foramen ovale into the left atrium and the left ventricle. Immediate surgical embolectomy of a 40-50 cm huge thrombus was successful. Immediately after surgery upon the cardiac mass the patient showed symptoms of acute right leg ischemia. Thus a second embolectomy was necessary, the surgeon removed a 10 cm thrombus from the right external iliacal artery. There was no evidence of another pulmonary embolism timely related to the paradoxical embolism.
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PMID:[Cardiogenic shock due to acute mitral dysfunction after deep venous thrombosis]. 1514 82

Pulmonary hypertension (PH) is a threatening condition that can be associated with a great variety of both pulmonary and extrapulmonary diseases. In all forms of severe PH the pulmonary vascular bed looses its physiological features of a "high flow-low pressure system", putting an increased afterload on the right ventricle (RV). Acute pulmonary hypertension in the intensive care unit often represents a clinical problem secondary to acute respiratory failure, left heart failure, pulmonary embolism, or decompensation of prior PH by concurrent pulmonary or cardiovascular disease. Right ventricular failure (acute cor pulmonale) occurs when relevant increases in pulmonary vascular resistance overwhelm its compensatory mechanisms, both abruptly on a previously normal RV, or gradually on a chronic cor pulmonale. This review addresses the main pathophysiological aspects of severe PH, focusing on the hemodynamic derangements occurring in the setting of acute cor pulmonale, and emphasizing the role of ventricular interdependence (the way right ventricular failure greatly affects diastolic and systolic function of the left ventricle), the risk of RV ischemia (the end stage of RV failure) and systemic organ hypoperfusion (caused by antegrade and retrograde heart failure). The understanding of the peculiar features of this type of cardiovascular insufficiency is necessary to both provide effective monitoring and adequate supportive therapy.
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PMID:Pathophysiology of severe pulmonary hypertension in the critically ill patient. 1517 2

Acute occlusion of an abdominal aortic aneurysm is a rare phenomenon. Its possible complications include distal spasm followed by arterial thrombosis, ischemia of the distal limbs, distal embolization, acidosis, hyperkalemia, and the development of venous thrombosis of the lower limbs. Surgical correction is often complicated by cardiac decompensation, renal failure, fatal pulmonary embolism, and metabolic derangements related to toxins released from the revascularized limb. Unless contraindicated, immediate systemic heparinization must be undertaken when the diagnosis is first suspected. We present a case of sudden occlusion of an abdominal aortic aneurysm complicated by venous thrombosis involving both lower extremities. After undergoing surgical revascularization, the patient sustained massive fatal pulmonary emboli. Prophylactic interruption of the inferior vena cava may be indicated in patients who present with this complication of abdominal aortic aneurysm.
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PMID:Acute occlusion of an abdominal aortic aneurysm complicated by bilateral lower extremity venous thrombosis: A case report. 1521 31

Acute disorder of mesenteric circulation (ADMC) is an emergency pathology of the abdominal organs. It occurs in 0.2% of general surgery patients. A total of 346 patients with verified (before, during operation and/or on autopsy) diagnosis of ADMC were analyzed retrospectively. There were 217 (62.7%) women and 129 (37.3%) men. The mean age of the patients was 68.4+/-3.6 years. In 50.7% of patients, ADMC was induced by thrombosis of the unpaired visceral branches of the abdominal aorta, in 29.1% -- by embolism of the superior mesenteric artery (SMA), in 7.8% -- by thrombosis of the portomesenteric bed, in 7.5% -- by non-occlusion mesenteric ischemia (NOMI), and in 4.9% by diseases of the parietal vessels of the bowel. The most prevalent risk factors of ADMC were: atherosclerosis of the aorta and its branches, previous reconstructions for occlusion-stenotic arterial lesions, episodes of arterial embolism in the anamnesis, congenital and acquired hemostatic disorders, oral contraception, thromboses of the deep veins and/or pulmonary embolism in the anamnesis, operations on the abdominal organs, different types of acute end chronic heart failure. In SMA thrombosis, occlusion most frequently affects the orifice (93.5%) and initial segment of the great vessel, In embolism it occurs before or at the level of the middle colic artery (in 57.9%). Disseminated bowel necroses are more frequently encountered in occlusions of the arterial bed (87.7% in thromboses and 83.3% emdolism) than in the venous system (8.3%).
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PMID:Acute disorders of mesenteric circulations: the etiology, risk factors and incidence of lesions. 1562 45

Thromboembolism is considered the inciting cause of many vascular disorders including acute coronary syndrome (ACS), ischemic stroke, pulmonary embolism (PE), deep vein thrombosis (DVT), and mesenteric ischemia. Adrenergia and inflammation are known to accompany these conditions, particularly among arterial thromboembolic disorders, but the teleologic basis of these associations remains poorly understood. We argue that thromboembolism may sometimes be the result, rather than the cause, of acute vascular events, and may be precipitated by underlying adrenergia. Thromboembolic events are most prone to occur during parts of the circadian, seasonal, lifespan, and reproductive cycles with sympathetic dominance, as well as during behavioral, exertional, physiologic, and iatrogenic activation of sympathetic stress. Molecular evidence suggests that adrenergia and inflammation can promote coagulation and lead to co-activation of the pathways. Acute vascular events that occur without angiographic evidence of occlusion suggest that some infarcts may be attributable to adrenergia alone. "Embolic" disorders may represent asynchronous systemic phenomena rather than clot migration. During acute thromboembolism, downstream tissue hypoxia can activate maladaptive self-propelling cycles of sympathetic bias, inflammation, and coagulation. The counterproductive co-activation of these pathways may reflect a maladaptive interlink forged during the primordial evolution of trauma physiology. Their rapid co-mobilization enables rapid control of hemorrhage, microbial defense, and perfusion maintenance during trauma, but the pathways may behave maladaptively in the setting of modern diseases where endothelial injury may be more often precipitated by smoking, diabetes, dyslipidemia, or hypertension. Sympathetic blockade is already employed in ACS, and beta-blockers are used as antihypertensives to prevent stroke. Our hypothesis suggests that the benefits of beta-blockers in stroke may be independent of antihypertensive effects, and that adrenergia may represent a target for managing all thromboembolic disorders, independent of anti-coagulative and thrombolytic therapies. Perhaps reducing adrenergia, rather than maintaining high cerebral perfusion pressure, may represent a counterintuitive strategy for treating stroke and for reducing reperfusion injury. Plausible mechanisms by which autonomic dysfunction may induce venous thrombosis are discussed, especially in those with baroreceptor dysfunction, immobilization, or dehydration. Unexplained hypercoagulability of cancer may also operate through tumor-induced adrenergia and inflammation.
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PMID:Can thromboembolism be the result, rather than the inciting cause, of acute vascular events such as stroke, pulmonary embolism, mesenteric ischemia, and venous thrombosis?: a maladaptation of the prehistoric trauma response. 1569 86


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