Multicenter trial

Pulmonary embolism

Pulmonary angiography

Cardiology

Thrombolysis

Radiology

Multicenter study

Myocardial infarction

Internal medicine

Clinical endpoint

Medicine

Lung

Randomized controlled trial

Angiography

КАРДИОЛОГИЯ УЗБЕКИСТАНА

The aim of this study was to determine the lowest optimal tissue plasminogen activator (tPA) dose and delivery duration using ultrasound-facilitated catheter-directed thrombolysis (USCDT) for the treatment of acute intermediate-risk (submassive) pulmonary embolism.Previous trials of USCDT used tPA over 12 to 24 h at doses of 20 to 24 mg for acute pulmonary embolism.Hemodynamically stable adults with acute intermediate-risk pulmonary embolism documented by computed tomographic angiography were randomized into this prospective multicenter, parallel-group trial. Patients received treatment with 1 of 4 USCDT regimens. The tPA dose ranged from 4 to 12 mg per lung and infusion duration from 2 to 6 h. The primary efficacy endpoint was reduction in right ventricular-to-left ventricular diameter ratio by computed tomographic angiography. A major secondary endpoint was embolic burden by refined modified Miller score, measured on computed tomographic angiography 48 h after initiation of USCDT.One hundred one patients were randomized, and improvements in right ventricular-to-left ventricular diameter ratio were as follows: arm 1 (4 mg/lung/2 h), 0.40 (24%; p = 0.0001); arm 2 (4 mg/lung/4 h), 0.35 (22.6%; p = 0.0001); arm 3 (6 mg/lung/6 h), 0.42 (26.3%; p = 0.0001); and arm 4 (12 mg/lung/6 h), 0.48 (25.5%; p = 0.0001). Improvement in refined modified Miller score was also seen in all groups. Four patients experienced major bleeding (4%). Of 2 intracranial hemorrhage events, 1 was attributed to tPA delivered by USCDT.Treatment with USCDT using a shorter delivery duration and lower-dose tPA was associated with improved right ventricular function and reduced clot burden compared with baseline. The major bleeding rate was low, but 1 intracranial hemorrhage event due to tPA delivered by USCDT did occur.

A Randomized Trial of the Optimum Duration of Acoustic Pulse Thrombolysis Procedure in Acute Intermediate-Risk Pulmonary Embolism