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Long-term benefit of thrombolytic therapy in patients with pulmonary embolism

Department of Veterans Affairs Medical Center, Harvard Medical School, Boston, MA, USA; ter, MA, USA

Edward D Folland

University of Massachusetts Medical Center, Worces

Kevin M McIntyre

Department of Veterans Affairs Medical Center, Harvard Medical School, Boston, MA, USA; ter, MA, USA

Arthur A Sasahara

Brigham and Women’s Hospital, Boston, MA, USA

A total of 23 of the 40 patients who had angiographically proven pulmonary embolism and who had initially been randomized to an IV infusion of heparin (n = 11) or a thrombolytic agent (urokinase or streptokinase, n = 12) were restudied after a mean follow-up of 7.4 years to measure the right-sided pressures and to evaluate their response to exercise during supine bicycle ergometry. Results showed that, at rest, the pulmonary artery (PA) mean pressure and the pulmonary vascular resistance (PVR) were significantly higher in the heparin group compared with the thrombolytic group (22 vs. 17 mmHg, p < 0.05, and 351 vs. 171 dynes s^-1 cm^-5, p < 0.02, respectively). During exercise both parameters rose to a significantly higher level in the heparin group (from rest to exercise, PA: 22-32 mmHg, p < 0.01; PVR: 351-437 dynes s^-1 cm^-5, p < 0.01, respectively), but not in the thrombolytic group (rest to exercise, PA: 17-19 mmHg, p = NS; PVR: 171-179 dynes s^-1 cm^-5, p = NS). It is concluded that thrombolytic therapy preserves the normal hemodynamic response to exercise in the long term and may prevent recurrences of venous thromboembolism and the development of pulmonary hypertension.

Key Words: long-term hemodynamic and clinical benefit • pulmonary embolism • thrombolytic therapy

Vascular Medicine, Vol. 5, No. 2, 91-95 (2000)
DOI: 10.1177/1358836X0000500205


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