Pulmonary embolism (PE) is life threatening disease requiring early diagnosis and treatment. Thrombolytic therapy (TT) is required in patients with massive PE. PE has a high mortality but the in-hospital all-cause case mortality rates were lower in unstable patients who received TT than those who did not. However, it was reported that minority (nearly 30%) of unstable patients received thrombolytic therapy. The reason that majority of unstable patients failed to receive thrombolytic therapy is unclear. The higher rates of complications including the life threatening bleeding may be a reason of reluctance in the use of TT.~The lungs are the only organ receiving the entire cardiac output. Therefore, they are the point of convergence for the entire molecules of the thrombolytic agent, independent from the route of administration. So that lower doses of the TT might be effective in PE, with the additional benefits of enhancing its safety profile. The percutaneous endovenous intervention for deep venous thrombosis has suggested an exquisitely favorable pulmonary response to low-dose thrombolysis. The aim of the present study was to assess the effects of low-dose (25mg) prolonged administration (in 6 hours) of tissue type plasminogen activator (tPA) on in-hospital mortality and outcomes in patients with massive PE.~The primary end points consisted of in hospital all cause mortality, major complications, pulmonary hypertension and right ventricular dysfunction. Secondary points are all cause mortality, pulmonary hypertension and right ventricular dysfunction at 6 month.
The aim of the present study was to assess the effects of low-dose (25mg) prolonged administration (in 6 hours) of tissue type plasminogen activator (tPA) on in-hospital mortality and outcomes in patients with massive PE.