Background Although deep-vein thrombosis and pulmonary embolismare considered common complications after major trauma, theirfrequency and the associated risk factors have not been carefullyquantified.
Methods We performed serial impedance plethysmography and lower-extremitycontrast venography to detect deep-vein thrombosis in a cohortof 716 patients admitted to a regional trauma unit. Prophylaxisagainst thromboembolism was not used.
Results Deep-vein thrombosis in the lower extremities was foundin 201 of the 349 patients (58 percent) with adequate venographicstudies, and proximal-vein thrombosis was found in 63 (18 percent).Three patients died of massive pulmonary embolism before venographycould be performed. Before venography, only three of the patientswith deep-vein thrombosis had clinical features suggestive ofthe condition. Deep-vein thrombosis was found in 65 of the 129patients with major injuries involving the face, chest, or abdomen(50 percent); in 49 of the 91 patients with major head injuries(54 percent); in 41 of the 66 with spinal injuries (62 percent);and in 126 of the 182 with lower-extremity orthopedic injuries(69 percent). Thrombi were detected in 61 of the 100 patientswith pelvic fractures (61 percent), in 59 of the 74 with femoralfractures (80 percent), and in 66 of the 86 with tibial fractures(77 percent). A multivariate analysis identified five independentrisk factors for deep-vein thrombosis: older age (odds ratio,1.05 per year of age; 95 percent confidence interval, 1.03 to1.06), blood transfusion (odds ratio, 1.74; 95 percent confidenceinterval, 1.03 to 2.93), surgery (odds ratio, 2.30; 95 percentconfidence interval, 1.08 to 4.89), fracture of the femur ortibia (odds ratio, 4.82; 95 percent confidence interval, 2.79to 8.33), and spinal cord injury (odds ratio, 8.59; 95 percentconfidence interval, 2.92 to 25.28).
Conclusions Venous thromboembolism is a common complicationin patients with major trauma, and effective, safe prophylacticregimens are needed.
Source Information
From the Departments of Medicine (W.H.G., K.I.C., R.M.J.) and Research Design and Biostatistics (J.P.S.) and the Clinical Epidemiology Unit (W.H.G., E.C., J.P.S.), Sunnybrook Health Science Centre, University of Toronto, Toronto.
Address reprint requests to Dr. Geerts at Sunnybrook Health Science Centre, Rm. D674, 2075 Bayview Ave., Toronto, ON M4N 3M5, Canada.
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