Functional characteristics of left ventricular synchronization via right ventricular outflow-tract pacing detected by two-dimensional strain echocardiography oleh Yasutaka Hirayama, MD, Yuichiro Kawamura, MD, PhD, Nobuyuki Sato, MD, PhD, Tatsuya Saito, MD, PhD, Hideichi Tanaka, MD, PhD, Yasuaki Saijo, MD, PhD, Kenjiro Kikuchi, MD, PhD, Katsumi Ohori, MD, PhD, Naoyuki Hasebe, MD, PhD