急性下壁心肌梗死心电图ST段变化与梗死相关动脉及定位关系分析

目的 通过急性下壁心肌梗死心电图不同导联ST段变化与冠状动脉造影的对比研究,确定梗死相关动脉及定位.方法 64例急性下壁心肌梗死患者按冠状动脉造影结果分为右冠状动脉(RCA)闭塞组(51例)与左回旋支动脉(LCX)闭塞组(13例);按病变发生位置,RCA闭塞组又分为近段、中段、远段闭塞,LCX闭塞组又分为近段、远段闭塞.记录各组STⅢ抬高＞STⅡ、STaVL下移＞STⅠ、STV1有无下移、STV7-V9及STV3R～V5R有无抬高等情况,并进行比较.结果 RCA闭塞组STⅢ抬高＞STⅡ、STaVL下移＞STⅠ、STV1无下移、STV7-V9无抬高以及STV3R-V5R抬高比率明显高于LCX闭塞组(P＜0.01或＜0.05);LCX闭塞组STⅢ抬高≤STⅡ、STaVL下移≤STⅠ、STV1下移、STV7～V9抬高、STV3R～V5R无抬高比率明显高于RCA闭塞组(P＜0.01或＜0.05).判断RCA闭塞为梗死相关动脉时,STⅢ抬高＞STⅡ、STaVL下移＞STⅠ、STV1无下移的灵敏度分别为90.2%、80.4%、80.4%;STⅢ抬高＞STⅡ、STaVL下移＞STⅠ的特异度分别为84.6%、84.6%,均高于80.0%;STV3R～V5R抬高虽然灵敏度只有51.0%,但特异度高达100.0%;判断LCX闭塞为梗死相关动脉时,STⅢ抬高≤STⅡ、STaVL下移≤STⅠ的灵敏度分别为84.6%、84.6%,特异度分别为90.2%、80.4%;STV1下移与STV7-V9抬高的特异度分别为80.4%、78.4%;STV3R-V5R无抬高的灵敏度为100.0%,特异度为51.0%.RCA闭塞组近段闭塞STV3R～V5R抬高比率高于远段闭塞[76.9%(10/13)比27.3%(3/11),P=0.015].结论 心电图Ⅰ、Ⅱ、Ⅲ、aVL、V1、V7～V9、V3R～V5R导联ST段的表现,可以初步判断急性下壁心肌梗死的梗死相关动脉;而V3R～V5R导联ST段的抬高对于判断RCA的近段或远段闭塞有意义.

Abstract：

Objective To predict the infarction of related artery(IRA)and the site of occlusion by analyzing the diversify of electrocardiographic ST segment and coronary angiography findings in acute inferior myocardial infarction. Methods Sixty-four patients with acute inferior myocardial infarction were divided into two groups by coronary angiography: right coronary artery(RCA)occlusion group(51 patients)and left circumflex coronary artery(LCX)occlusion group(13 patients). RCA occlusion group included proximal,middle and distal components occlusion, and LCX occlusion group included proximal and distal components occlusion. The cases of STⅢ elevation ＞ ST Ⅱ ,STaVL depression ＞ STⅠ ,STV1 depression,STV7-V9 and STV3R-V5R elevation were recorded and compared. Results The percentage of STⅢ elevation ＞ STⅡ, STaVL depression ＞STⅠ, STV1 no depression, STV7-V9 no elevation and STV3R-V5R elevation was significantly higher in RCA occlusion group than those in LCX occlusion group(P ＜ 0.01 or ＜ 0.05). The percentage of ST Ⅲ elevation ≤ ST Ⅱ, ST,VL depression ≤STⅠ ,STV1 depression,STV7-V9 elevation,STV3R-V5R no elevation was significantly higher in LCX occlusion group than those in RCA occlusion group(P ＜0.01 or ＜0.05). In RCA occlusion group:the sensitivity of STⅢ elevation ＞ STⅡ, STaVL depression ＞ STⅠ and STV1 no depression was 90.2%, 80.4% and 80.4%;the specificity of STⅢ elevation ＞ STⅢ and STaVL depression ＞ STⅠwas 84.6% and 84.6% ;the sensitivity of STV3R-V5R elevation was 51.0%, but its specificity was 100.0%. In LCX occlusion group: the sensitivity of STⅢ elevation ≤ ST Ⅲ and STaVL depression ≤ ST Ⅰ was 84.6% and 84.6%, and their specificity was 90.2% and 80.4%;the specificity of STV1 depression and STV7-V9 elevation was 80.4% and 78.4%; the sensitivity of STV3R-V5R no elevation was 100.0% ,and its specificity was 51.0%. In RCA occlusion group, the percentage of STV3R-V5Relevation was higher in proximal components occlusion than that in distal components occlusion[76.9%(10/13)vs. 27.3%(3/11),P=0.015]. Conclusions The IRA can be initially judged by analysis of the characteristics in the ST segment in Ⅰ,Ⅱ ,Ⅲ ,aVL,V1,V7-V9,V3R-V5R lead in acute inferior myocardial infarction. And the ST segment elevation in V3R-V5R is meaningful in the judgment of proximal and distal components occlusion in RCA.

Analysis of the relationship between electrocardiographic ST segment diversify and infarction of related artery and the site of occlusion in acute inferior myocardial infarction

Objective To predict the infarction of related artery(IRA)and the site of occlusion by analyzing the diversify of electrocardiographic ST segment and coronary angiography findings in acute inferior myocardial infarction. Methods Sixty-four patients with acute inferior myocardial infarction were divided into two groups by coronary angiography: right coronary artery(RCA)occlusion group(51 patients)and left circumflex coronary artery(LCX)occlusion group(13 patients). RCA occlusion group included proximal,middle and distal components occlusion, and LCX occlusion group included proximal and distal components occlusion. The cases of STⅢ elevation ＞ ST Ⅱ ,STaVL depression ＞ STⅠ ,STV1 depression,STV7-V9 and STV3R-V5R elevation were recorded and compared. Results The percentage of STⅢ elevation ＞ STⅡ, STaVL depression ＞STⅠ, STV1 no depression, STV7-V9 no elevation and STV3R-V5R elevation was significantly higher in RCA occlusion group than those in LCX occlusion group(P ＜ 0.01 or ＜ 0.05). The percentage of ST Ⅲ elevation ≤ ST Ⅱ, ST,VL depression ≤STⅠ ,STV1 depression,STV7-V9 elevation,STV3R-V5R no elevation was significantly higher in LCX occlusion group than those in RCA occlusion group(P ＜0.01 or ＜0.05). In RCA occlusion group:the sensitivity of STⅢ elevation ＞ STⅡ, STaVL depression ＞ STⅠ and STV1 no depression was 90.2%, 80.4% and 80.4%;the specificity of STⅢ elevation ＞ STⅢ and STaVL depression ＞ STⅠwas 84.6% and 84.6% ;the sensitivity of STV3R-V5R elevation was 51.0%, but its specificity was 100.0%. In LCX occlusion group: the sensitivity of STⅢ elevation ≤ ST Ⅲ and STaVL depression ≤ ST Ⅰ was 84.6% and 84.6%, and their specificity was 90.2% and 80.4%;the specificity of STV1 depression and STV7-V9 elevation was 80.4% and 78.4%; the sensitivity of STV3R-V5R no elevation was 100.0% ,and its specificity was 51.0%. In RCA occlusion group, the percentage of STV3R-V5Relevation was higher in proximal components occlusion than that in distal components occlusion[76.9%(10/13)vs. 27.3%(3/11),P=0.015]. Conclusions The IRA can be initially judged by analysis of the characteristics in the ST segment in Ⅰ,Ⅱ ,Ⅲ ,aVL,V1,V7-V9,V3R-V5R lead in acute inferior myocardial infarction. And the ST segment elevation in V3R-V5R is meaningful in the judgment of proximal and distal components occlusion in RCA.