Massive and submassive pulmonary embolism: experience with an algorithm for catheter-directed mechanical thrombectomy

Area of Science:

• Cardiovascular Medicine
• Interventional Cardiology
• Pulmonary Medicine

Background:

• The established role of catheter-directed mechanical thrombectomy (CDMT) for massive pulmonary embolism (MPE) and submassive pulmonary embolism (SMPE) remains undefined.
• This study reports on the use of CDMT as a primary treatment strategy for MPE and SMPE patients.

Purpose of the Study:

• To evaluate the efficacy and safety of CDMT as a primary treatment for MPE and SMPE.
• To assess clinical outcomes, including technical success, symptom resolution, complications, and survival.

Main Methods:

• Retrospective review of 15 consecutive MPE and SMPE patients treated between 2008-2010.
• Patients underwent AngioJet CDMT, with or without Alteplase power-pulse spray, if they presented with significant hemodynamic compromise or hypoxia.
• Outcomes assessed included angiographic success, clinical improvement, complication rates, and survival to discharge.

Main Results:

• All 15 patients (14 SMPE, 1 MPE) with hypoxia, tachycardia, right heart strain, or cardiogenic shock showed symptom resolution and improved heart strain.
• Technical and clinical success was achieved in all patients, with no in-hospital mortality.
• Complications occurred in 20% of patients (acute tubular necrosis, intraoperative cardiac arrest); average hospitalization was 9 days.

Conclusions:

• CDMT is a highly effective primary treatment for MPE and SMPE in high-risk patients, achieving high technical and clinical success rates.
• Careful patient selection and procedural experience are crucial for optimizing therapeutic outcomes in this patient population.