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1.通过健康成人背部导联V_(7、8、9)心电图对Q波的统计分析提出诊断病理性Q波其深度>R/4仅作参考,特别是在个别导联或R波<5mm的导联出现是极不可靠的.但更重要的是其宽度在7、3导联>0.03秒,V_9导联>0.04秒,年龄<40岁者应从严掌握.判断背部导联V_(7、8、9)心电图对正后壁心肌梗塞的诊断时要特别注意Q波的宽度≥0.04秒,深度≥3mm同时出现于两个以上的导联,Q/R比值>50%或呈QS型;且伴有ST一T缺血性改变以及V_1导联逆向改变,其诊断较有一定价值.背部导联V_(7、8、9)的高一肋、低一肋记录时除V_9低一助Q波深度与标准位置均值比较有显著性差异外余均无显著性差异,但Q波的宽度和深度发生变化的机会较多,故操作时电极位置要正确.
1. Through the statistics analysis of Q wave of V_ (7,8,9) electrocardiogram of healthy adult back lead, it is suggested that the depth of pathological Q wave is> R / 4 only for reference, especially in individual lead or R wave <5mm Of the lead appears to be extremely unreliable.But more important is its width in 7,3 lead> 0.03 seconds, V_9 lead> 0.04 seconds, the age of <40 years should be mastered. Judging the back of the lead V_ (7 , 8,9) electrocardiogram is to pay special attention to the diagnosis of posterior wall myocardial infarction Q wave width ≥ 0.04 seconds, depth ≥ 3mm also appeared in more than two leads, Q / R ratio> 50% or was QS ; And accompanied by ST-T ischemic changes and reverse V_1 lead, the diagnosis of more value. Back of the V_ (7,8,9) of a high rib, low rib record in addition to a lower V_9 There was no significant difference in Q wave depth and standard position mean, but the Q wave width and depth were more likely to change, so the electrode position should be correct during operation.