Xin Chen1, Satoshi Nakatani. 1. Department of Cardiology, National Cerebral and Cardiovascular Center Echo Lab, the First Affiliated Hospital of China Medical University, Shenyang, China.
Abstract
BACKGROUND: Peak strain has been promising as an index of wall motion but it is sometimes susceptible to the image quality. OBJECTIVE: We investigated the feasibility of a novel index, transmural myocardial strain gradient (TMSG), derived from myocardial strain M-mode imaging (TDI-Q, Toshiba) for quantifying regional systolic wall motion. METHOD: We measured transmural myocardial strain distribution at the left ventricular lateral, posterior, inferior, septal, anteroseptal and anterior walls in the basal and midventricular short-axis images using TDI-Q. Twenty normals (35 ± 3 years) and 35 consecutive patients (63 ± 9 years) with coronary artery disease (CAD, 19 patients with old myocardial infarction, 4 patients with acute myocardial infarction, 12 patients with angina pectoris) were studied. Peak strain, endocardial- and epicardial-half strain and TMSG ((peak strain, - epicardial strain)/distance between peak and epicardial points) were obtained. Coefficient of variation (CV) of each index was calculated. RESULTS: In control subjects, the best reproducibility of the variables was obtained for TMSG with the smallest CV (11.6%) (27.8%, 28.1%, and 35.5%, respectively for CV of peak strain, endocardial- and epicardial-half strain). All segments in control subjects and normal segments in CAD patients showed no significant difference in TMSG (15.1 ± 1.8 vs. 15.1 ± 1.6%/mm, P = ns). TMSG was the lowest for akinetic segments and highest for the normal segments (P < 0.001). CONCLUSION: TMSG was more robust than simple strain values to quantitatively assess wall motion. This could successfully identify subtle regional differences in wall function.
BACKGROUND: Peak strain has been promising as an index of wall motion but it is sometimes susceptible to the image quality. OBJECTIVE: We investigated the feasibility of a novel index, transmural myocardial strain gradient (TMSG), derived from myocardial strain M-mode imaging (TDI-Q, Toshiba) for quantifying regional systolic wall motion. METHOD: We measured transmural myocardial strain distribution at the left ventricular lateral, posterior, inferior, septal, anteroseptal and anterior walls in the basal and midventricular short-axis images using TDI-Q. Twenty normals (35 ± 3 years) and 35 consecutive patients (63 ± 9 years) with coronary artery disease (CAD, 19 patients with old myocardial infarction, 4 patients with acute myocardial infarction, 12 patients with angina pectoris) were studied. Peak strain, endocardial- and epicardial-half strain and TMSG ((peak strain, - epicardial strain)/distance between peak and epicardial points) were obtained. Coefficient of variation (CV) of each index was calculated. RESULTS: In control subjects, the best reproducibility of the variables was obtained for TMSG with the smallest CV (11.6%) (27.8%, 28.1%, and 35.5%, respectively for CV of peak strain, endocardial- and epicardial-half strain). All segments in control subjects and normal segments in CAD patients showed no significant difference in TMSG (15.1 ± 1.8 vs. 15.1 ± 1.6%/mm, P = ns). TMSG was the lowest for akinetic segments and highest for the normal segments (P < 0.001). CONCLUSION:TMSG was more robust than simple strain values to quantitatively assess wall motion. This could successfully identify subtle regional differences in wall function.
Authors: Erik N Taylor; Matthew P Hoffman; David Y Barefield; George E Aninwene; Aurash D Abrishamchi; Thomas L Lynch; Suresh Govindan; Hanna Osinska; Jeffrey Robbins; Sakthivel Sadayappan; Richard J Gilbert Journal: J Am Heart Assoc Date: 2016-03-15 Impact factor: 5.501