【摘要】 本文根据弹性力学原理使用超声心动图仪配合录象机测量了15例心功能不全患者和50例正常人的左室收缩期室壁应力(每单位面积的力)-应变(每单位长度的长度变化)关系。本方法能定量出:心肌收缩力(收缩期心肌劲度)、前负荷(舒张末期周向应力)和后负荷(收缩末期周向应力)。结果表明:心功能不全病人心肌收缩力由正常值112.8±23.5降至70.2±11.5kPa,前负荷由正常值30.5±9.2增至42.1± 9.1kPa,后负荷也由正常值13.9±1.5增至33.4±11.4kPa,心率由正常的71.4±10.7增至84.1±12.3次/分。心肌力学参数是检测心功能不全的理想指标。本文讨论了方法学、可行性和临床意义。更多还原

【Abstract】 Systolic left ventricular wall stress(force per unit area)-strain (change in length per unit length) relations were computed in 15 patients with cardiac insufficiency and 50 normal subjects based on theories of elasticity by echocardiography ind videorecorder in this paper. The contractility (systolic myo-cardial stiffness), preload (end diastole circumferential stress) and afterload (end systole circumferential stress) were quantitated by this technique. The results showed that contractility of cardiac insufficiency fallen (70.15 ± 11.5 vs 112.8± 23.5KPa), preload increased (42.1 ± 9.1 vs 30.5± 9.2KPa) and afterload increased (33.4± 11.4 vs 13.9±1.5 KPa) and heart beat increased (84.1± 12.3 vs 71.4±10.7 beat/min) . The myocardial mechanics are an ideal indexes for changes in cardiac insufficiency. The technique, feasibility and clinical significance were discussed.更多还原