Quantitative evaluation of short-term effect of cardiac resynchronization therapy by automated motion tracking of mitral annular displacement / 中华超声影像学杂志

Objective To evaluate the tissue motion tracking of mitral annular displaeement(TMAD) method in the assessment of short-term effect of cardiac resynchronization therapy (CRT). Methods Twenty six chronic heart failure (CHF) patients with CRT were detected by TMAD. The maximal displacement of the six points of mitral annulus(DS), the standard deviation of the time to regional peak systolie displacement of the six points (Td-sd) and the maximal temporal difference of any two points(Tds-diff) were compared before and one month after CRT. And the correlation between mean displacement and left ventricular ejection fraetion(LVEF),left ventricular end systolic volume(LVESV), fraction area change (FAC) was analyzed. Results Compared with the pre-operatively, the displacement and the mean displaeement of the six points of mitral annulus were significantly increased(P<0.01),Tds diff and Td-sd were decreased(P<0.05) one month after CRT. TMAD correlated with LVEF,LVESV and FAC (r =0.419, r = 0.529, r = 0.567, P <0.05) one month after CRT. Conclusions TMAD is a new technology to evaluate the short-term effect of CRT.

Tissue velocity imaging observation of post-systolic shortening of left ventricular wall in chronic heart failure patients / 中国医学影像技术

Objective To observe the post-systolic shortening (PSS) during isovolumic relaxation phase and its clinical significance in regional myocardium in chronic heart failure (CHF) patients.MethodsLeft ventricular regional myocardium movement in 60 CHF patients (CHF group) and 30 healthy volunteers (control group) were assessed with tissue velocity imaging (TVI). QLAB software was used to measure the systolic peak velocity (V_s), regional systolic time (T_s), post-systolic shortening velocity (V_(pss)) and post-systolic shortening time (T_(pss)) at the basal and middle levels of left ventricle. Results In CHF patients, the rate of isovolumic relaxation phase PSS was 34.44% both in basal and mid segments, the rate of pathological PSS was 29.44% and 29.72%, respectively. The rate of isovolumic relaxation phase PSS in control group was 26.11% and 20.56%, respectively; none pathological PPS occured. Compared with the physiological PSS of control group, the pathological PSS of CHF group had a higher peak velocity and a longer time (P<0.05). Conclusion The pathological PSS of CHF patients has high peak velocity and long duration, which may be one of the causes leading to the asynchronous movement of left ventricle in CHF.