Predictors and outcomes of "super-response" to cardiac resynchronization therapy

Area of Science:

• Cardiology
• Heart Failure Management
• Cardiac Resynchronization Therapy

Background:

• Cardiac resynchronization therapy (CRT) is a key treatment for heart failure (HF).
• The degree of left-ventricular ejection fraction (LVEF) improvement post-CRT is a potential predictor of patient outcomes.
• This study investigates the association between LVEF response to CRT and survival benefits.

Purpose of the Study:

• To determine if greater improvement in LVEF after CRT correlates with enhanced survival.
• To identify patient characteristics associated with significant LVEF improvement following CRT.

Main Methods:

• 693 patients undergoing CRT were analyzed across two international centers.
• Patients were categorized into non-/modest- (LVEF change ≤5%), moderate- (6-15%), and super-responders (>15%).
• Changes in LVEF, New York Heart Association (NYHA) functional class, and left ventricular end-diastolic dimension (LVEDD) were assessed.

Main Results:

• Super-responders (n=112) showed significantly greater improvements in NYHA class and LVEDD compared to other groups.
• Super-responders were more likely to be female, have nonischemic cardiomyopathy, and present with lower creatinine and pulmonary artery systolic pressure.
• Kaplan-Meier survival analysis demonstrated superior survival rates for super-responders versus non-/modest- and moderate-responders.

Conclusions:

• The extent of survival benefit from CRT is directly proportional to the degree of improvement in left ventricular systolic function.
• Achieving 'super-response' (LVEF improvement >15%) is associated with better HF symptom management and long-term survival.
• Specific patient profiles, including female sex, nonischemic cardiomyopathy, and lower pulmonary artery systolic pressure, are linked to a higher likelihood of super-response to CRT.