Relief of drug refractory angina by biventricular pacing in heart failure

Area of Science:

• Cardiology
• Heart Failure Research
• Interventional Cardiology

Background:

• Cardiac resynchronization therapy (CRT) is known to improve left ventricular (LV) function.
• Patients with congestive heart failure (CHF) and coronary artery disease (CAD) often experience drug-refractory angina.
• Myocardial revascularization may not be an option for all patients with diffuse CAD.

Purpose of the Study:

• To investigate if CRT can increase the threshold for drug-refractory angina in specific CHF and CAD patients.
• To evaluate the impact of CRT on angina symptoms, cardiac function, and hospitalizations in this patient cohort.

Main Methods:

• Seventy-five patients with CHF and CAD not amenable to revascularization received CRT.
• Baseline characteristics including NYHA functional class, QRS duration (QRSd), and left ventricular ejection fraction (LVEF) were recorded.
• Outcomes assessed included angina frequency, 6-minute walk test distance, LVEF, NYHA class, and hospitalizations post-CRT.

Main Results:

• Successful CRT implantation led to significant improvements: QRSd decreased, LVEF increased, and NYHA class improved.
• Patients experienced a marked reduction in weekly angina episodes and an increased 6-minute walk test distance.
• No further hospitalizations were required for CHF or angina management post-CRT.

Conclusions:

• CRT demonstrates significant benefits in improving cardiac function and reducing angina in selected CHF and CAD patients.
• The positive effects of CRT on cardiac function may extend to better angina control in severely symptomatic individuals.
• CRT offers a potential therapeutic strategy for managing refractory angina in patients with heart failure and coronary artery disease.