Duplex ultrasound screening for deep vein thrombosis in spinal cord injured patients at rehabilitation admission

Abstract

Objective: To determine the rate of deep vein thrombosis (DVT) newly diagnosed by duplex ultrasound in patients with acute spinal cord injury (SCI) at admission for rehabilitation. Design: Retrospective case-control study. Setting: Independent specialized spinal cord rehabilitation hospital. Patients: Data were collected from records of 189 SCI patients admitted for rehabilitation over a 1-year period who underwent a duplex scan and were not admitted with a known diagnosis of DVT. Main Outcome Measures: A DVT newly diagnosed by duplex ultrasound at rehabilitation admission. Results: Twenty-two patients (11.6%) had a newly diagnosed DVT at time of admission. Chi-square analysis found no statistically significant relationship between level of injury (tetraplegia vs paraplegia), motor complete (ASIA A and B) versus incomplete status (ASIA C and D), or cause of SCI (traumatic vs nontraumatic injury) in determining a positive or negative duplex result ( χ 2 = 1.709, p = .191; χ 2 = 1.314, p = .252; χ 2 = 3.155, p = .076; respectively). Prophylaxis for DVT decreased the risk of developing a DVT: 4.1% of patients administered prophylaxis as compared to 16.4% of patients not given prophylaxis ( χ 2 = 6.558, p = .01). Only 38.6% of patients transferred to rehabilitation were undergoing DVT prophylaxis. Conclusions: The prevalence of DVT in acute SCI patients at admission to rehabilitation is significant. A duplex ultrasound is an important noninvasive technique to screen patients with acute and subacute SCI for DVT on admission to the rehabilitation setting regardless of the completeness, level, or cause of the patients' injury.