7Amundsen BH, Helle-Valle T, Edvardsen T, et al. Noninvasive myo- cardial strain measuremem by speckle tracking echocardiography validation against sonomicrometry and tagged magnetic resonance imaging[ J]. J Am Coil Cardio1,2006,47 (4) :789 - 93.
8Leitman M, Lysyansky P, Sidenko S, et al. Two-dimensional strain a novel software for real-time quantitative echocardiographic assess- ment of myocardial function [ J ]. J Am Soc Echocardiogr, 2004,17 (10) :1021 -9.
10Kaba A, Kelly M, Greenwood T, et al. Exercise induced QRS broade- ning as a potential marker for significant coronary artery disease[ J]. Int Cardio1,2008,26 (5) :775 - 797.