Most pulmonary embolism (PE) is treated with anticoagulation alone, which prevents new clot while the body resolves the existing one. But when a PE is large enough to strain or destabilize the right heart, waiting is not always safe — and the clot itself may need to be removed or debulked. Pulmonary embolectomy, in its modern catheter-based form, does exactly that: extracts thrombus from the pulmonary arteries to relieve right-ventricular strain quickly. This article reviews how PE is risk-stratified, when clot removal is indicated, and the catheter and surgical options available.
Risk Stratification Drives Everything
PE management hinges on severity. High-risk (massive) PE — with hypotension or shock — carries high early mortality and demands rapid reperfusion: systemic thrombolysis, catheter-based therapy, or surgical embolectomy. Intermediate-risk (submassive) PE — right-ventricular strain with preserved blood pressure — is the expanding arena for catheter intervention, chosen to offload the right heart while avoiding the bleeding risk of full systemic lysis. Low-risk PE is managed with anticoagulation. Matching the intervention to the risk tier is the central clinical decision.
Catheter-Based Thrombectomy
Two catheter strategies dominate. Aspiration thrombectomy mechanically sucks thrombus out of the pulmonary arteries through a large-bore catheter — removing clot without a thrombolytic drug, which is attractive when bleeding risk is high or lysis is contraindicated. Catheter-directed and ultrasound-assisted thrombolysis (covered in our CDT article) instead dissolves clot with a low local drug dose. The two philosophies — extract versus dissolve — are sometimes combined, and the choice depends on stability, bleeding risk, and clot burden.
Surgical Embolectomy
Surgical pulmonary embolectomy — open removal of clot on cardiopulmonary bypass — retains a defined role: high-risk PE when thrombolysis has failed or is contraindicated, clot trapped in transit through the heart, or when catheter options are unavailable or unsuitable. Once considered a last resort, outcomes at experienced centers have improved, and it is best viewed as one arm of a coordinated response rather than a fallback.
The PERT Model and Device Toolchain
Because these decisions are time-critical and multidisciplinary, many centers use a Pulmonary Embolism Response Team (PERT) — cardiology, interventional radiology, surgery, and critical care converging on a single case. The interventional toolchain includes large-bore aspiration systems such as the DOVI aspiration catheter and Mantis Pro rotational thrombectomy and aspiration system, plus thrombolysis catheters and, where indicated, retrievable IVC filters — spanning INVAMED's pulmonary embolism management and DVT portfolios. Selection follows the risk tier and Instructions for Use.
Frequently Asked Questions
When is a pulmonary embolism clot removed rather than just thinned?
When the PE is high-risk (with shock) or intermediate-high-risk with right-ventricular strain — situations where relieving the obstruction quickly changes outcomes, beyond what anticoagulation alone provides.
What is catheter aspiration thrombectomy for PE?
Mechanical removal of pulmonary artery clot through a large-bore catheter, without a thrombolytic drug — useful when bleeding risk makes lysis undesirable.
Is surgical embolectomy still performed?
Yes, in selected high-risk cases where thrombolysis fails or is contraindicated, or when clot is caught in transit in the heart. Outcomes at experienced centers have improved.
What is a PERT?
A Pulmonary Embolism Response Team — a multidisciplinary group that rapidly decides the best therapy for a significant PE.
Related on INVAMED
Companions: catheter-directed thrombolysis, IVC filters. Patient hub: pulmonary embolism.
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