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本文综合报道733名正常人背部导联(V_7、V_8、V_9)心电图特征,并就背部导联的QRS波形态、Q波时间振幅、Q/R比值、ST-T改变及V_1,V_2R/S>1等进行统计学分析.结果表明背部导联与常规导联有较多不同.认为背部导联的病理性Q波指标应为:在V_8导联上Q≥0.04秒、Q/R>1/2;V_9导联上Q>0.01秒、Q/R>1.
In this paper, we report the electrocardiographic features of 733 normal people’s dorsal leads (V7, V8, V9), and analyzed the changes of QRS waveform, Q wave time amplitude, Q / R ratio, ST-T and V_1, V_2R / S > 1, etc. The results showed that there were more differences between the back lead and the conventional lead.It was suggested that the pathological Q-wave index of the back lead should be: Q≥0.04 seconds on the V_8 lead, Q / R> 1 / 2; Q> 0.01 second on V_9 lead, Q / R> 1.