正常人肢体导联心电图与对应头胸导联心电图的比较

目的比较健康人常规12导联中的肢体导联心电图与相对应头胸导联正常心电图之间的差异。方法选择健康体检者同时记录常规心电图及头胸导联心电图,由两位资深的电生理医生分析,作出心电图无异常的诊断。而后以6个肢体导联（I、II、III和aVR、aVL、aVF）分别与头胸导联中对应的各两组导联（CL2、CL4、CL6和HV7、HV8、HV9及HR3、HO、HL3和AR3、HR7、AL3）,进行逐一配对的心电图比较。观察心电图P、QRS、T波的形态,计数各导联同一波形之假性改变者,作对应导联的卡方检验进行比较。结果在120例健康人正常心电图中,常规肢体导联中的III导联双相或倒置P波的出现率是31.6%、宽或深Q波的出现率是29.1%、低平或倒置T波的出现率是26.7%,而对应头胸导联的CL6或HV9导联上述假性改变的出现率均为零（0.0%）;aVR导联P波和T波倒置的出现率是100%,而对应头胸导联AR3倒置P、T波的出现率均为18.3%,HR3导联无假性改变;aVL导联T波倒置的出现率是23.3%,而HO和HR7导联无假性改变。正常心电图P-QRS-T波假性改变在两导联系统的出现率有统计学上的差异（均为P<0.01）。结论健康人的正常心电图,头胸导联波形假性改变出现率比常规肢体导联显著降低。

Comparison of normal ECGs between limb lead and corresponding head-chest lead in healthy subjects

AIM To observe whether the corresponding head-chest (HC) lead electrocardiogram (HCECG) is more exact and accordant than the limb lead of routine 12-lead electrocardiogram (RLECG) in the healthy subjects. METHODS HCECGs and RLECGs were recorded simultaneously in the healthy subjects and the normal diagnosis of each HCECG and RLECG was confirmed by the analyses of 2 senior physicians of clinical electrophysiology. The comparison was made between RLECGs and HCECGs,including 2 groups (I,II,III to CL2,CL4,CL6 a...