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使用哪些导联分析心律所需的诊断资料通常可从所有的习用心电图导联中收集到。但最清楚和最有用的资料则常从下列导联获得:(1)反映心房波形最好的导联,通常是标准导联Ⅱ、V_1和S_5(电极置于胸骨右缘第五肋间,负电极置于胸骨柄)。(2)反映QRS波群形态最好的导联。反映QRS波群最好的导联,特别是能反映时相差异性室内传导和心室异位搏动的鉴别特征的导联,是V_1导联以及MCL_1,即改良的CL_1导联(正电极置于胸骨右缘第四肋间,负电极置于左肩)。该导联的另一优点
The diagnostic information needed to use which leads to analyze the heart rate is usually collected from all of the conventional ECG leads. However, the clearest and most useful information is often obtained from the following leads: (1) The best lead that reflects the atrial waveform, usually standard lead II, V_1, and S_5 (the electrode is placed in the fifth intercostal space on the right side of the sternum, Negative electrode placed in the sternum). (2) The best lead that reflects the morphology of QRS complex. The best leads that reflect the QRS complex, and in particular the differential features that reflect the time-differentiated ventricular conduction and ventricular ectopic beats, are the V_1 lead and the MCL_1, the modified CL_1 lead (the positive electrode is placed on the sternum Right fourth intercostal space, the negative electrode on the left shoulder). Another advantage of this lead