Deep vein thrombosis (DVT) and subsequent pulmonary embolism (PE) is a major source of mortality and morbidity in stroke patients. This study was designed to determine the effectiveness of different prophylactic treatments in the prevention of DVT after a stroke in patients undergoing rehabilitation. An additional objective was the identification of risk factors for DVT in stroke in patients during rehabilitation. Three hundred and sixty patients, over a 3-year period, were randomly assigned to one of four groups: adjusted dose heparin, intermittent pneumatic compression (IPC), functional electrical stimulation (FES), or control. There was no significant difference in the development of DVT by treatment group. Patients with DVT on admission (prevalent, n = 61) were compared with the study patients (n = 360). Time interval (from stroke to admission) and lactic dehydrogenase (LDH) concentration were significant risk factors, as well as predictors, for development of DVT (p < 0.000). These results suggest that the longer a patient remains without DVT prophylaxis after a stroke, the greater the risk of developing DVT and this supports early prophylaxis before rehabilitation.

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