Low-dose heparin in postoperative patients: a prospective, coded study

Abstract

One hundred five patients over age 40 undergoing various major operations were randomly divided into control and treated groups; all were treated by subcutaneous injection containing either 5,000 international units aqueous heparin sodium or a placebo one hour prior to operation and every 12 hours thereafter for eight days. Deep vein thrombosis (DVT) was detected by daily -125I-fibrinogen injection and leg scanning, and confirmed by ascending phlebography. Both groups were comparably distributed by age, sex, variety of operation, incidence of previous thromboembolism, and myocardial and cerebrovascular disease. Blood loss was not increased in the treated group. Incidence of DVT was 8.6 percent for the total group, 7.5 percent in the heparin-tested group (four of 53), and 9.6 percent in the control group (five of 52), including one control patient with a normal scan (who later had a pulmonary embolus.