Prior revascularization increases the effectiveness of enhanced external counterpulsation

Area of Science:

• Cardiology
• Noninvasive Cardiovascular Therapies

Background:

• Enhanced external counterpulsation (EECP) is a noninvasive treatment for chronic angina.
• Its efficacy is questioned in triple-vessel coronary artery disease (CAD) due to the need for patent vessels.

Purpose of the Study:

• To evaluate the impact of prior coronary artery bypass grafting (CABG) on the effectiveness of EECP in patients with chronic angina and CAD.
• To assess EECP efficacy across different severities of CAD and residual disease post-CABG.

Main Methods:

• Sixty patients with CAD and chronic angina were studied, with 35 unrevascularized and 25 with prior CABG.
• Patients were categorized by CAD extent (single-, double-, triple-vessel) or residual disease post-CABG.
• Benefit was assessed using pre- and post-treatment radionuclide stress testing.

Main Results:

• EECP showed comparable favorable responses in patients with prior CABG (71%) versus unrevascularized patients (80%).
• EECP was effective for single- and double-vessel CAD, both unrevascularized and post-CABG with residual disease (88% vs. 80%).
• CABG significantly enhanced EECP benefits in triple-vessel CAD patients with stenotic grafts (80%) compared to unrevascularized triple-vessel CAD patients (22%).

Conclusions:

• EECP is an effective treatment for post-CABG ischemia.
• EECP demonstrates efficacy even with extensive CAD and stenotic grafts, suggesting a new therapeutic role.