Prominent R wave in ECG lead V1 predicts improvement of left ventricular ejection fraction after cardiac resynchronization therapy in patients with or without left bundle branch block.
Bode WD, Bode MF, Gettes L, Jensen BC, Mounsey JP, Chung EH. Prominent R wave in ECG lead V1 predicts improvement of left ventricular ejection fraction after cardiac resynchronization therapy in patients with or without left bundle branch block. Heart Rhythm. 2015 Oct; 12(10):2141-7.