Ultrasound-Facilitated, Catheter-Directed Fibrinolysis for Acute Pulmonary Embolism.

Summary

In 544 patients with intermediate-risk PE, ultrasound-facilitated, catheter-directed fibrinolysis plus anticoagulation reduced the 7-day composite of PE-related death, cardiorespiratory decompensation/collapse, or symptomatic recurrence compared with anticoagulation alone (4.0% vs 10.3%; RR 0.39; P=0.005). Major bleeding did not differ significantly and no intracranial hemorrhage occurred.

Key Findings

• Primary composite endpoint at 7 days: 4.0% (intervention) vs 10.3% (control); RR 0.39; P=0.005.
• Benefit was driven primarily by reduced cardiorespiratory decompensation/collapse.
• Major bleeding within 7 and 30 days was similar between groups; no intracranial hemorrhage occurred.
• Multinational adaptive-design RCT with blinded outcome adjudication and prespecified protocols.

Clinical Implications

Consider ultrasound-facilitated catheter-directed fibrinolysis for selected intermediate-risk PE patients with right ventricular strain and biochemical injury plus signs of cardiorespiratory distress, while balancing procedural resources and bleeding risks.

Limitations

• Short-term primary endpoint with limited power to detect mortality differences.
• Open-label procedural assignment may introduce performance bias; device/operator variability.

Future Directions

Evaluate long-term outcomes (CTEPH, quality of life), cost-effectiveness, and refine selection criteria to identify subgroups with greatest net benefit.