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目的 :评价急性心肌梗死后心电图抬高ST段不同下降幅度患者的左室收缩功能及收缩储备功能。材料和方法 :接受直接PTCA的AMI患者共 42例 ,于入院后第 7± 2天行多巴酚丁胺负荷超声心动图。以PTCA前及后 1小时 12导联心电图抬高ST段的下降幅度分为两组 ,A组 :ST段下降≥ 5 0 %共 2 3例 ,B组 :ST段下降 <5 0 %共 19例。结果 :基础状态 ,左室射血分数A组明显高于B组 (6 2 98% ,5 7 2 1% )。主动脉峰值流速、峰值加速度、血流速度积分、每搏输出量、每搏指数A组与B组间无统计学差异。用药 10ug/kg·min-1后主动脉峰值加速度、每搏输出量及每搏指数A组明显高于B组 (3 6 2vs 2 45 ;12 7 30vs 10 2 75 ;77 87vs6 0 2 9)。结论 :心电图ST段下降幅度≥ 5 0 %组的左室收缩功能及收缩储备功能明显好于ST段下降幅度 <5 0 %组。
OBJECTIVE: To evaluate left ventricular systolic function and systolic reserve in patients with ST-segment elevation after acute myocardial infarction. Materials and Methods: A total of 42 AMI patients undergoing direct PTCA received dobutamine stress echocardiography at day 7 ± 2 after admission. To 12 hours before and after PTCA and 12-lead electrocardiogram elevation ST segment was divided into two groups, A group: ST segment decreased ≥ 50% a total of 23 cases, B group: ST segment decreased <50% 19 example. Results: The basal state, left ventricular ejection fraction A group was significantly higher than the B group (62 98%, 57 72%). Aortic peak velocity, peak acceleration, blood flow velocity integral, stroke volume, stroke index A group and B group was no significant difference. After administration of 10ug / kg · min-1 aortic peak acceleration, stroke volume and stroke index A group was significantly higher than the B group (362vs245; 12730vs10275; 7787vs6 029). Conclusion: The left ventricular systolic function and systolic reserve function in ST segment of ST segment ≥ 50% were significantly better than those of ST segment (<50%).