High incidence of occult femoral vein thrombosis related to multiple venous sheaths during electrophysiological studies.

T here are no evidence based studies dealing with the incidence of venous sheath related thrombosis and the role of heparin, particularly in the setting of prolonged procedures with multiple lines. The clinical importance of catheter related thrombosis remains undefined in the setting of electrophysiological studies (EPS). We sought to determine the incidence of multiple venous sheath related thrombosis and the role of fixed dose, body weight independent, low molecular weight heparin (LMWH) for prophylaxis of venous thrombosis in patients undergoing EPS.