Predictive value of frontal QRS-T angle after cardiac resynchronization therapy.

Abstract Objective It is practical and useful to detect patients who benefit from cardiac resynchronization therapy (CRT) by electrocardiographic (ECG) methods. In this study, the predictive role of the frontal QRS-T angle and other ECG parameters was evaluated in CRT responder patients. Method Seventy-seven consecutive patients with left ventricular ejection fraction (LVEF) ≤ 35%, New York Heart Association (NYHA) classes II-III, ambulatory class IV and normal sinus rhythm, who had complete left bundle branch block and were treated with CRT were included in this study. Patients were classified as “CRT responders” and “CRT non responders” according to their LVEF improvement. The frontal QRS-T angle was calculated as the absolute value of the difference between the QRS and T wave axes [frontal QRS-T angle = (QRS axis-T axis)]. Results The mean age of the patients was 64.5 ± 9.1 years, and the average follow-up was 28 (12–47) months. The post-implantation LVEF was higher in the patients CRT responders group (p Conclusion The narrowed frontal QRS-T angle (