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近年来,国内外临床工作者都注意到P_(v1)终末电势(简写为Ptf_(v_1))负值对诊断冠心病的价值和意义,但看法还很不一致。有认为其敏感性不亚于二级梯运动试验;有认为可作为冠心病的早期诊断和甚至对预测以后发生心肌梗塞有一定价值;但多数认为是反映左室功能不全。 Ptf_(v1)是指V_1导联P波终末电势(terminal force)的振幅(以毫米mm计)×时间(秒·Sec)乘积来表示。但其负值量的标准也不一致,有认为达-0.02毫米·秒即有意义,有认为<-0.03毫米·秒,亦有以≤-0.04毫米·秒为标准。一般认为P_(v1)终末电势的负值增大与左心房传导组织和心肌供血不足的关系最密切。Morris认为左心受累时,左心房在横面的向量轻度向右旋转,以及左房传导延迟或传导途径延长。Scharmroth认为冠心病患者房间束(Bach-
In recent years, clinicians at home and abroad have noticed the value and significance of P_ (v1) terminal potential (abbreviated Ptf_ (v_1)) negative value in the diagnosis of coronary heart disease, but the opinions are still not consistent. Have considered that its sensitivity is no less than two ladder test; have that as early diagnosis of coronary heart disease and even after the prediction of myocardial infarction has some value; but most think it is to reflect left ventricular dysfunction. Ptf_ (v1) is the amplitude (in millimeters mm) × time (sec · Sec) of the terminal force of P-wave of V_1 lead. However, the standard of negative value is inconsistent. It is significant to think that the value of -0.02 mm · sec is considered, and it is considered as <-0.03 mm · sec., And the standard is also ≤-0.04 mm · sec. Generally considered P_ (v1) terminal potential negative increase in left atrial conduction and myocardial insufficiency most closely. When Morris thought left-sided involvement, the vector of the left atrium on the transverse plane rotated mildly to the right, and the left atrial conduction delay or conduction route was prolonged. Scharmroth believes that coronary heart disease patients with room beam (Bach-