title: Is it safe to withhold anticoagulation based on a single negative color duplex examination in patients with suspected deep venous thrombosis? A prospective 3-month follow-up study.
abstract: The aim of this study was to evaluate prospectively the clinical short-term outcome of patients with suspected deep venous thrombosis (DVT) and negative duplex investigation and to assess whether it is clinically safe to withhold anticoagulant therapy on the basis of a single negative color duplex examination including the calf veins. The study included a consecutive series of patients with suspected DVT referred for color duplex examination over 1 year. Patients with negative duplex findings (n = 341) were followed up for 3 months clinically and/or by reviewing hospital charts and the official registry of health care and causes of death. In only 1 of the patients was DVT diagnosed following a negative duplex examination. This patient had accentuated symptoms and a thrombus in the peroneal vein was detected at subsequent phlebography. None of the other patients with a negative duplex finding developed signs of, or had treatment initiated for, DVT or pulmonary embolism during the 3-month period after the duplex investigation. Five patients died, but none of the deaths was related to thromboembolism. The results indicate that it is clinically safe to rely on a single negative color duplex examination in patients without any progressing symptoms from the affected limb.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000925:Anticoagulants / Q000627:therapeutic use*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012307:Risk Factors; D013924:Thrombophlebitis / Q000000981:diagnostic imaging* / Q000188:drug therapy*; D013997:Time Factors; D018615:Ultrasonography, Doppler, Color
chemical_list: D000925:Anticoagulants