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患者男,65岁,冠心病。图1Ⅱ导联为同次不连续记录。Ⅰ导联 QRS 是 qR 型,Ⅲ导联及Ⅱ导联中大多数QRS 是 rS型,S_Ⅲ>S_Ⅱ,QRS 电轴-53°,是左前分支阻滞。Ⅱ导联可见频发的房性早搏(下称房早)。一次房早重叠于ⅡaR_8的 T 波之上,未下传。下传的房早有的QRS 与窦性心搏相同,是 rS 型,如Ⅱ_a 的 R_4、R_(11)与前一 QRS 的间距为0.41-0.46s,后面无室性早搏。另一些房早的 QRS 是 Rs 型,如Ⅱ_a 的 R_2、Ⅱ_b 的 R_3、R_(10),它们与前一 QRS 的间距为0.49s,后面皆有室性早搏(室早)。室早的联律间期相等,属折返性。从Ⅱ导联 QRS
Male patient, 65 years old, with coronary heart disease. Figure 1 Ⅱ lead for the same time not continuous record. QRS of lead Ⅰ is type qR, most of QRS of lead Ⅲ and lead Ⅱ are rS type, S_Ⅲ> S_Ⅱ, and QRS axis -53 °, which is the left anterior branch block. Ⅱ lead can be seen in frequent atrial premature beats (hereinafter referred to as room early). One room early overlap in Ⅱ aR_8 T waves above, did not pass. The QRS of the descending part of the room has the same as the sinus beats, which is the rS type, such as R_4 of Ⅱ_a. The interval of R_ (11) and the previous QRS is 0.41-0.46s, and there is no ventricular premature beat in the back. Other QRS early QRS is Rs type, such as Ⅱ_a R_2, Ⅱ_b R_3, R_ (10), their distance from the previous QRS 0.49s, followed by premature ventricular contractions (ventricular premature). Room early joint between the law is equal, is a reentry. From lead Ⅱ QRS