Sustained benefit of cardiac resynchronization therapy

Area of Science:

• Cardiology
• Medical Devices
• Heart Failure Management

Background:

• Limited long-term echocardiographic data exists for cardiac resynchronization therapy (CRT) from real-world patient populations.
• Most existing CRT data comes from highly selected patient cohorts in clinical trials.

Purpose of the Study:

• To assess long-term echocardiographic remodeling following CRT in a general patient population.
• To evaluate the sustained effects of CRT on heart function and structure over two years.

Main Methods:

• A biventricular pacemaker was implanted in 130 advanced heart failure patients.
• Two-year echocardiographic follow-up was conducted.
• Patient data included baseline characteristics, echocardiographic parameters, and mortality.

Main Results:

• Echocardiographic response (≥5% LVEF improvement) was observed in 69% at 3 months, increasing to 91% by 2 years in survivors.
• Left ventricular ejection fraction (LVEF) improved significantly from 22% at baseline to 39.7% at 2 years.
• Reverse remodeling (≥10% reduction in LV end-systolic volume) was sustained, reaching 91.7% by 2 years.
• Early LVEF improvement after 3 months correlated with better long-term survival (P=0.04).
• Mortality was higher in males, patients with elevated NT-proBNP, renal dysfunction, or left atrial dilatation.

Conclusions:

• Cardiac resynchronization therapy leads to sustained left ventricular reverse remodeling and improved echocardiographic measures over two years.
• An increase in LVEF of 5% or more within 3 months of CRT implantation is associated with improved long-term survival.