Left ventricular dyssynchrony predicts response and prognosis after cardiac resynchronization therapy

Area of Science:

• Cardiology
• Heart Failure Management
• Medical Imaging

Background:

• Cardiac resynchronization therapy (CRT) improves heart failure (HF) outcomes but not all patients benefit.
• Identifying CRT responders before implantation is crucial for optimizing treatment.
• Left ventricular (LV) dyssynchrony, assessed by tissue Doppler imaging, is a potential predictor of CRT response.

Purpose of the Study:

• To predict CRT response and prognosis in end-stage heart failure (HF) patients.
• To evaluate the role of LV dyssynchrony in predicting CRT outcomes.
• To assess the prognostic value of LV dyssynchrony in patients undergoing CRT.

Main Methods:

• Eighty-five end-stage HF patients with QRS duration >120 ms and LBBB underwent tissue Doppler imaging.
• Clinical status (NYHA class, QoL, 6-min walk), LV volumes, and ejection fraction were assessed at baseline and 6 months.
• One-year follow-up for clinical events (death, HF hospitalization) was recorded.

Main Results:

• Seventy-four percent of patients responded to CRT.
• Responders exhibited significantly greater LV dyssynchrony (87 ms) than non-responders (35 ms).
• An LV dyssynchrony cutoff of 65 ms predicted clinical improvement (80% sensitivity) and reverse remodeling (92% specificity).

Conclusions:

• LV dyssynchrony >/= 65 ms is associated with positive response to CRT.
• Patients with significant LV dyssynchrony (> 65 ms) demonstrate an excellent prognosis after CRT.
• Tissue Doppler imaging-assessed LV dyssynchrony is a valuable tool for predicting CRT success.