HealthDay News — Rivaroxaban does not lower risk of symptomatic venous thromboembolism and related death in medical patients after hospital discharge, compared to placebo, according to a study published in the September 20 issue of the New England Journal of Medicine.

Alex C. Spyropoulos, MD, from Northwell Health at Lenox Hill Hospital in New York City, and colleagues randomized 12,024 medically ill patients who were at increased risk for venous thromboembolism (based on a modified International Medical Prevention Registry on Venous Thromboembolism score ≥4 or a score of 2 or 3 plus a plasma D-dimer level of more than twice the upper limit of the normal range) to either once-daily rivaroxaban (10mg adjusted for renal insufficiency) or placebo for 45 days at hospital discharge. 

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The researchers found that a composite outcome of symptomatic venous thromboembolism or death due to venous thromboembolism occurred in 0.83% of patients in the rivaroxaban group and in 1.10% in the placebo group (hazard ratio, 0.76; 95% confidence interval, 0.52 to 1.09; P=0.14). Symptomatic non-fatal venous thromboembolism occurred in 0.18 and 0.42%, respectively (hazard ratio, 0.44; 95% confidence interval, 0.22 to 0.89). Major bleeding occurred more often in the rivaroxaban group (hazard ratio, 1.88; 95% confidence interval, 0.84 to 4.23).

“Given the relatively low incidence of events despite the enrichment strategy and the lack of effect on venous thromboembolism-related death, the usefulness of extended thromboprophylaxis remains uncertain,” the authors write.

Several authors disclosed financial ties to pharmaceutical companies, including Janssen, which manufactures rivaroxaban and funded the study.

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