A new baseline scoring system may help to predict response to cardiac resynchronization therapy

Area of Science:

• Cardiology
• Medical Imaging
• Clinical Trials

Background:

• Previous trials like PROSPECT found no single echocardiographic measure reliably predicts patient selection for cardiac resynchronization therapy (CRT).
• Identifying optimal candidates for CRT remains a clinical challenge.

Purpose of the Study:

• To develop and validate a predictive score for positive response to cardiac resynchronization therapy (CRT).
• To assess the efficacy of combining multiple clinical, electrocardiographic (ECG), and echocardiographic variables.

Main Methods:

• Analyzed 27 ECG and echocardiographic variables in 100 consecutive patients receiving CRT.
• Defined positive CRT response as a ≥ 15% decrease in left ventricular (LV) end-systolic volume.
• Developed a response score based on right ventricular (RV) pacing-induced left bundle branch block (LBBB), tissue Doppler (TDI-PW) time difference, and wall motion score index (WMSI).

Main Results:

• Multivariate regression identified RV pacing-induced LBBB, WMSI ≤ 1.59, and TDI-PW > 50 ms as significant predictors of CRT response.
• A response score > 2 accurately predicted positive CRT response (95% responders vs. 11% with score ≤ 2, p < 0.001).
• The receiver operating characteristic (ROC) analysis showed an area under the curve of 0.97 (p = 0.0001).

Conclusions:

• A novel response score integrating clinical, ECG, and echocardiographic data shows promise as a predictor of CRT response.
• This score may aid in selecting patients who will benefit from CRT, but requires further validation.