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

The prime therapeutic objective of prophylactic anticoagulation for patients undergoing total hip replacement is to reduce to a minimum fatalities from pulmonary embolism. Our low-dose heparin-warfarin prophylactic anticoagulation protocol affords significant protection in this regard (one fatal pulmonary embolism in 796 cases) without the use of venography or other objective tests to check for deep venous thrombosis and for all patients including those with venous disease or a history of prior thromboembolic disease. The 13.1% hematoma rate (5.0% late major) is a small, nonlethal, and acceptable price to pay for this protection.
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PMID:The efficacy of low-dose heparin--warfarin anticoagulation prophylaxis after total hip replacement arthroplasty. 47 94

Doppler ultrasound is the preferred screening test in asymptomatic patients with high risk for venous thrombosis. Radiographic phlebography leads to definitive diagnosis in most instances. Radionuclide angiography using 99mTc MAA with delayed images to detect particle entrapment in venous blood clots can be used when radiographic phlebography is contraindicated or impractical. To detect active thrombosis in patients with past venous disease, the serial fibrinogen uptake test is the method of choice. This method is also used to monitor the efficacy of anticoagulation therapy and to detect propagating thrombosis in patients failing to respond to anticoagulation, hopefully before massive lethal pulmonary embolism occurs. Radionuclide methods are contraindicated in pregnant women and children where non invasive methods are preferred. No completely satisfactory test exists for detection of hypogastric vein thrombosis. Among the methods currently being evaluated in the laboratory the ultrasound B-scan imaging, 99mTc MAA uptake test and 99mTc mAA venous scan offer the best possibilities for successful clinical application.
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PMID:The choice of test for diagnosis of venous thrombosis. 56 3

The iliac compression syndrome is caused by impaired venous drainage of the left leg, secondary to compression or stricture of the left iliac vein at, or just before, its junction with inferior vena cava. Serious potential complications are deep vein thrombosis, pulmonary embolism, venous congestion, and the resultant incapacity. Nine patients in whom the diagnosis was confirmed by iliac phlebography are described. Iliac pressure determinations were made in 7 patients. Four patinets underwent resection, and retroplacement of the right iliac artery behind the left iliac vein. The operative results were good. This rare syndrome should always be considered in the differential diagnosis of peripheral venous disease, as it can be treated in the early stages. If it is left untreated, there is a risk of pulmonary embolism or incapacitating peripheral vascular disease.
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PMID:The iliac compression syndrome. 69 50

Deep venous thrombosis and its sequelae, pulmonary embolism, recurrence, and the postthrombotic syndrome, affects a staggering number of patients. Deep venous thrombosis is a frequent postoperative complication, especially after certain orthopedic operations. Pulmonary embolism is the third leading cause of death in the United States, and the postthrombotic syndrome effects an estimated 500,000 Americans. Prompt diagnosis and treatment of thromboembolic disease is important, but prevention may be the key to lessening the number of patients with venous disease in the future.
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PMID:Venous diseases. 173 66

Factors contributing to deep vein thrombosis (DVT) were studied in 51 patients (62 knees) who had a cementless total knee arthroplasty (TKA) and in 51 patients (69 knees) who had a cemented TKA. All patients were treated with a primary TKA using a porous-coated anatomic prosthesis with a porous-coated central tibial stem. Deep vein thrombosis was diagnosed by roentgenographic venography, and pulmonary embolism was diagnosed by perfusion lung scanning. Incidence of DVT was 32%, and there was no pulmonary embolism. The factors that do not seem to have much relevancy to DVT were advanced age, orthopedic disease, one- or two-staged bilateral TKA, venous anatomic variations, number of venous valves, coagulation assay data, hypertension, tourniquet time, choice of cementless or cemented TKA, severity or duration of operation, amount of blood loss, and amount of blood transfused. Conversely, more immediate relevant factors were obesity, postoperative prolonged immobilization, earlier venous disease, and hyperlipidemia.
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PMID:Factors leading to low incidence of deep vein thrombosis after cementless and cemented total knee arthroplasty. 195 58

The incidence of deep vein thrombosis in 244 patients who had total knee replacement has been studied. In 120 the prosthesis was cemented and in 124 it was cementless. In all cases the replacement was primary and a porous-coated prosthesis with a porous-coated central tibial stem was used. Deep vein thrombosis was diagnosed by venography, and pulmonary embolism by perfusion scanning. The incidence of deep vein thrombosis in the cementless knees (23.8%) and in the cemented (25%) was approximately the same. The only significant predisposing factors for deep vein thrombosis in both groups were obesity, prolonged postoperative immobilisation, previous venous disease and hyperlipidaemia.
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PMID:The incidence of deep vein thrombosis after cementless and cemented knee replacement. 221 55

Proper management of patients with venous disease requires recognition of the various syndromes and an accurate objective diagnosis. Unfortunately many physicians are unfamiliar with the different venous disorders and are unaware of the fallibility of the clinical diagnosis of these syndromes. This article reviews the six common venous conditions that collectively are more common than coronary or peripheral arterial disease. Acute and recurrent deep vein thrombosis, postthrombotic syndrome, superficial thrombophlebitis, varicose veins, and pulmonary embolism may all confront the physician regardless of his or her specialty. Clinical recognition and differentiation of these disorders along with appropriate use of objective, noninvasive isotopic and venographic studies should lead to accurate diagnosis and management of these venous syndromes. Such an approach will permit prompt and appropriate therapy for disabling and potentially life-threatening venous thromboembolism while avoiding unnecessary anticoagulation of patients with disorders mimicking venous disease.
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PMID:Clinical and noninvasive assessment of venous disease as related to pulmonary embolism. 269 7

Thrombophlebitis leading to pulmonary embolism has been stated to cause as many as 9% of hospital deaths. Its diagnosis, sites of common occurrence, treatment and immediate sequelae have long been controversial subjects. A prospective study of thrombophlebitis was set up to evaluate these problems. One hundred and sixty-six patients diagnosed clinically as having thrombophlebitis or pulnmonary embolus were studied with the ultrasonic flow detector (doppler). To assess the stated accuracy of this instrument, venograms were done when possible. The doppler proved in this series to be 93% accurate as compared to venography which is comparable to other series. Pulmonary scans and angiograms were obtained from patients suspected of having pulmonary emboli. Results were as follows: 1) Of 113 patients suspected of having thrombophlebitis clinically, only 26 (23%) of the cases were confirmed by doppler; 2) Of 53 patients suspected of having pulmonary embolus clinically, only 18 (34%) had confirmation by scan, angiogram or doppler; 3) Of 39 patients in this series who had thrombophlebitis, 11 (23%) were not suspected of having lower extremity venous disease until pulmonary embolus occurred, 4) Calf vein thrombosis without additional proximal occlusion was present in only 10% of cases; and 5) Thirty per cent of doppler or venographically proven cases of thrombophlebitis occurred after orthopedic injuries or operations. It was concluded that physical examination alone was grossly inaccurate in determining the recurrence of lower extremity thrombosis. In fact physical examination alone appeared to select out for treatment large numbers of patients without venous disease while a significant number of patients with thrombophlebitis remained clinically asymptomatic until pulmonary embolism occurred. Most deep venous disease was found in the larger veins above the knee, explaining the paucity of diagnostic symptoms in these individuals. The ultrasonic flow detector was found to be an extremely accurate, simple and rapid bedside test that could be applied daily to the high risk groups. The appearance of thrombosis could then be treated with heparin with excellent prospects of preventing occurrence of pulmonary embolus.
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PMID:Thrombophlebitis and thromboembolism: results of a prospective study. 443 73

The frequency of venous disease probably surpasses that of heart disease and stroke. The fallibility of the clinical diagnosis of pulmonary embolism and deep vein thrombosis (DVT) approaches 50% error in both conditions. Because of the serious errors in omission and commission of the clinical diagnosis of venous thrombosis, a variety of noninvasive diagnostic techniques have been developed within the past decade. The purpose of this paper is to analyze these noninvasive venous modalities with more emphasis on what is available in our vascular lab at Charleston Area Medical Center-Charleston Division, West Virginia University Medical Center.
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PMID:Current status of the vascular laboratory in the diagnosis of deep vein thrombosis. 649 49

Thrombus formation depends on adherence of blood-formed elements to the intimal surface through platelet-vessel surface interaction, platelet release phenomena and aggregation, formation of fibrin, and the enmeshing of blood cells. Arterial thrombi involve platelet aggregation, whereas venous thrombi found in low flow or during stasis have greater proportions of erythrocytes and fibrin. It is not known if or how abnormalities of flow resistance, platelet thrombus formation, or endothelial and dynamic parameters affect the microcirculation, largely due to the difficulty of obtaining comprehensive data from these systems. Increases of fibrinogen observed in many disorders may result in minor changes in blood viscosity without known physiologic consequence, but in most disorders in which thrombosis is observed, the pathophysiologic mechanisms are multifactorial and abnormal blood viscosity is presumed to be a significant but not limiting component. Therapeutic approaches in thrombotic disorders should recognize which elements of the thrombotic triad predominate. In arterial disorders focus should be on platelet activity, and the objectives of venous thrombosis treatment include prevention of morbidity and death from pulmonary embolism, reduction of morbidity resulting from the acute thrombotic episode, and prevention of the postphlebitic syndrome. Pathology, mechanism, and treatment for specific thrombogenic disorders are described. Treatments suggested for hyperviscosity involve giving antibiotics during crises. Also discussed are thalassemia, paroxysomal nocturnal hemoglobinuria, polycythemia, cryoglobulinemia, paraproteinemia, diabetes mellitus, and disseminated intravascular coagulation. Studies have established a relationship between thromboembolic disease and oral contraceptives (OCs). The risk is only increased while the patient is taking OCs but is compounded in women undergoing surgery or who have a disorder which predisposes to venous disease. The risk for myocardial infarction or stroke is significantly increased when OCs are taken over age 35 and when there is hypertension, smoking, type-II hyperlipoproteinemia, and diabetes mellitus. The risk appears to be a function of estrogen dosage, causing a 25% mean increase in calf venous volume and 30% decrease in vein velocity of venous blood compared to controls. Low flow rates may contribute to venous thromboembolism. OCs may alter precisely regulated systems of coagulation and fibrinolysis and recent studies confirm abnormalities in the hemostatic system attributed to OCs. 16% of women taking OCs have a 60% or greater reduction in antithrombin III activity. The multiple effects of OCs often result in low-grade activation of the hemostatic system, potentially lowering the threshold to precipitate thrombus formation and possibly explaining the increased incidence of thromboembolic disease. Heparin appears to reverse many of these problems.
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PMID:Blood viscosity and thrombosis: clinical considerations. 676 12


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