Long-term experience with the Mobin-Uddin umbrella.

Umbrella filters have been inserted in 56 patients over the last seven years. Indications varied from shock to a huge clot in the major veins. Most of the patients were in Greenfield's Class IV. All were treated with heparin before and after caval filter insertion. There were no deaths, but there were a few complications. the cava were patent during the follow-up period in patients who were on Coumadin therapy. Minimal residual venous stasis was noticed in the legs. The Mobin-Uddin umbrella in a simple and effective means of prevention of pulmonary emboli.