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目的探讨组织速度成像评估原发性扩张型心肌病(DCM)左室心肌收缩后收缩(PSS)的意义。方法获取14例 DCM 患者和22例正常人左室18节段组织速度曲线,测量等容收缩期峰速(V_(IC))、射血期峰速(V_S)、PSS 峰速(V_(PSS))和 PSS 波持续时间(T_(PSS)),计算 V_(PSS)与 V_(IC)比值(V_(PSS)/V_(IC))、V_(PSS)与 V_S 比值(V_(PSS)/V_S)。以 V_(PSS)/V_(IC)作为判定主动性与被动性 PSS 的标准并对其参数进行比较。结果正常人仅少数节段出现生理性 PSS,而 DCM 各节段均出现病理性 PSS。与生理性 PSS 相比,病理性 PSSV_(PSS)、V_(PSS)/V_(IC)、V_(PSS)/V_S 增大,T_(PSS)延长。与被动性 PSS 相比,主动性 PSS 的 V_(PSS)、V_(PSS)/V_S 增大,T_(PSS)延长。结论 DCM 左室心肌存在病理性 PSS,可能与心肌“类缺血”状况有关。生理性和病理性 PSS、主动性和被动性 PSS 差异明显。
Objective To investigate the significance of tissue velocity imaging in assessing systolic contraction (PSS) of left ventricular myocardium in patients with primary dilated cardiomyopathy (DCM). Methods Tissue velocity curves of 18 segments of left ventricle in 14 patients with DCM and 22 normal controls were obtained. Vs, V_S, PSS (PSS) / V IC (IC), V PSS and V SS ratio V PSS / V PSS / V PSS / V_S). V_ (PSS) / V_ (IC) is used as a criterion to determine the initiative and passive PSS and its parameters are compared. Results Only a few segments of normal physiological PSS appear, and all segments of DCM pathological PSS. Compared with physiological PSS, pathological PSSV PSS, V PSS / V IC, V PSS / V_S increased and T PSS prolonged. Compared with the passive PSS, V_ (PSS), V_ (PSS) / V_S of the active PSS increase and T_ (PSS) increase. Conclusion There is pathological PSS in DCM left ventricular myocardium, which may be related to myocardial ischemia. Physiological and pathological PSS, active and passive PSS significantly different.