Diagnosis of myocardial ischemia by tissue Doppler curved Mª²mode strain rate imaging

    SONG Yan, QIAN Yunª²Qiu, LI Hongª²Ling, ZHANG Haiª²Bin, HE Guangª²Bin, LI Li

    Department of Ultrasound, Xijing Hospital, Fourth Military Medical University, Xi¬ðan 710033, China

    ¡¾Abstract¡¿ AIM: To observe the elongation of regional time to compression/expansion crossover(Tcec) of left ventricle (LV) compared with LV global time to compression/expansion crossover (T¬ðcec) detected by curved Mª²mode strain rate imaging(CMMª²SRI), and to estimate the value of elongation in the diagnosis of myocardial ischemia in patients with coronary heart disease(CHD). METHODS: Sixty CHD patients(CHD group) and 60 normal cases(control group) were examined. CMMª²SRI was used to detect Tcec of each segment of LV. Time by which Tcec exceeded T¬ðcec was termed as ¦¤Tcec. Coronary arteriography was used to define ischemic segments. The difference of ¦¤Tcec among ischemic segments, nonª²ischemic segments of CHD group and control group was observed. The breakpoint of myocardial ischemia was remarked and the sensitivity and specificity were calculated. RESULTS: Tcec was prolonged in ischemic segments. And the red/blue crossover borderline of CMMª²SRI appeared to be an irregularly curve. Using ¦¤Tcec¡Ý50 ms as criterion, the sensitivity and specificity of diagnosis of myocardial ischemia were 77.6% and 80.0%, respectively. CONCLUSION: Tcec elongation detected by CMMª²SRI can be used to diagnose myocardial ischemia of CHD directly, conveniently and nonª²invasively. The clinical application value is commendable. ......