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心电图是诊断心肌梗塞(以下简称心梗)的重要手段,根据急性心梗的衍变过程,通常分为急性、亚急性及慢性三期。急性心梗后,其中心区呈穿壁性环死,称坏死区,如探测极面向该区,则呈 QS 波;如面向坏死区的边缘部分,则呈 QR 波,如坏死区中尚有少量存活的心肌,则 QS 波中出现胚胎样γ波。Q 波常在梗塞后10小时以上出现,症状发生后1小时内通常不出现 Q 波。前壁心梗症状出现后2～3小时在胸导联上显示 Q 波为34%
ECG is an important means of diagnosis of myocardial infarction (hereinafter referred to as myocardial infarction), according to the evolution of acute myocardial infarction, usually divided into acute, subacute and chronic three. Acute myocardial infarction, the central area was perforated wall ring death, said the necrotic area, such as the detection of the pole facing the area, was QS wave; such as the edge facing the necrotic area, was QR wave, such as the necrotic area A small amount of surviving myocardium, embryo-like waves appear in the QS wave. Q wave often appear more than 10 hours after the infarction, Q wave usually does not appear within 1 hour after the onset of symptoms. Anterior myocardial infarction symptoms appear 2 to 3 hours in the chest lead showed Q wave was 34%