二尖瓣环自动追踪技术评价心肌梗死患者左心室收缩功能

目的 应用二尖瓣环自动追踪技术评价心肌梗死患者左心室收缩功能。并探讨二尖瓣环自动追踪技术与改良Simpson法在测量左心室收缩功能方面的相关性。方法 受试者共80例，其中健康志愿者47例，心肌梗死患者33例。所有受试者取心尖四腔心切面，应用改良Simpson法测量左室舒张末容积、收缩末容积、每搏输出量、心输出量、左室射血分数、每搏指数、心排指数，转换二尖瓣环自动追踪技术模式分别测量以上指标。采用相关分析比较二尖瓣环自动追踪技术与改良Simpson法对左室功能测量指标的相关性。结果 在正常人中二尖瓣环自动追踪技术与改良Simpson法测量指标相关系数：左室舒张末容积为0.838、收缩末容积为0.917、每搏输出量为0.611、心输出量为0.579、左室射血分数为0.648、每搏指数为0.514、心排指数为0.541。在心肌梗死患者中两种方法测量指标相关系数：左室舒张末容积为0.811、收缩末容积为0.872、每搏输出量为0.797、心输出量为0.774、左室射血分数为0.757、每搏指数为0.708、心排指数为0.754。同一观察者对左室收缩功能各项指标变异范围为1.3%±4.7%。观察者间对左室收缩功能各项指标变异范围为1.8%±5.9%。结论 二尖瓣环自动追踪技术不仅与改良Simpson法对正常人左室收缩功能相关性良好，而且在心肌梗死患者中相关性也很好。二尖瓣环自动追踪技术是评价左室收缩功能的一项简便而准确的方法。

Assessment of left ventricular systolic function with automated mitral annular tracking in myocardial infarction

Objective To investigate the assessment of left ventricular systolic function with automated mitral annular tracking technology, compared with improved Simpson method. Methods The subjects were 80 cases including 47 healthy volunteers and 33 cases of patients with myocardial infarction. End-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), cardiac output (CO), left ventricular ejection fraction(LVEF), stroke volume index (SI) and cardiac output index (CI) were measured with automated mitral annular tracking and modified Simpson method in the apical window at 4-chamber, respectively, and analyzed with correlation statistics. Results The r of EDV, ESV, SV, CO, LVEF, SI and CI measured with automated mitral annular tracking and modified Simpson method in normal subjects were 0.838, 0.917, 0.611, 0.579, 0.648, 0.514 and 0.541,respectively. The r of EDV, ESV, SV, CO, LVEF, SI and CI measured with automated mitral annular tracking and modified Simpson method in myocardial infarction were 0.811, 0.872, 0.797, 0.774, 0.757, 0.708 and 0.754, respectively. No statistical difference exists between the two kinds of measurements. Variation range of each indicator of left ventricular contraction function by the same observer were 1.3%±4.7%. Variation range of each indicator of left ventricular contraction function between observers were 1.8%±5.9%. Conclusion Automated mitral annular tracking has a good correlation with modified Simpson method for assessing left ventricular systolic function. Automated mitral annular tracking method and modified Simpson method have no statistical differences in left ventricular systolic function measurement. It suggests that automated mitral annular tracking method is a simple and accurate method to evaluate left ventricular systolic function.