时间:2013-11-08 17:19 文章来源:http://www.lunwenbuluo.com 作者:耿晓玲 孙磊 张永超 点击次数:
体表心电图Ⅱ导联定位于左下和左侧上壁,Ⅲ导联定位于右下部,心肌血供在右冠状动脉处轻微偏右,在左回旋支动脉轻微偏左[9],右冠状动脉闭塞时引起的损伤电流在Ⅱ导联小于Ⅲ导联,而在左回旋支动脉则相反[10]。有研究显示[11],目前STⅠ压低和(或)STaVL压低以及STⅢ抬高≥STⅡ时检测右冠状动脉闭塞的敏感指标。本研究结果显示,在右冠状动脉组中,合并右室梗死、STV1抬高≥0.5mm、STⅠ压低≥0.5mm的阳性预测值和特异度均为100.0%;STⅢ抬高≥STⅡ的灵敏度最高;STaVL压低≥0.5mm的阴性预测值最高。
急性下壁心肌梗死合并广泛性胸前导联压低提示前壁心肌缺血,是同时存在多支病变或左前降支病变的标志;急性下壁心肌梗死可能表现为右胸导联ST段下移。有研究显示[12-13],右冠状动脉病变主要表现为下壁心肌梗死无胸前导联ST段压低,右冠状动脉引起的闭塞预后较左回旋支动脉差。本研究结果显示,在左回旋支动脉组中,STaVL抬高≥0.5mm的阳性预测值和特异度均为100%;STⅠ抬高≥0.5mm的灵敏度最高;STⅠ抬高≥0.5mm、STⅢ抬高≤STⅡ的阴性预测值为最高。
综上所述,急性下壁心肌梗死以右冠状动脉为主要的梗死相关动脉,不同梗死相关动脉在心电图的表现上存在一定的差异,因此,心电图在急性下壁心肌梗死相关动脉预测中有重要的价值,由于本研究样本量较小,有待于大样本量的进一步研究、验证。
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