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左前分支阻滞(LAFB)临床上较为常见,其诊断主要是根据十二导联心电图额面心电轴左偏(-30°以上)和肢体导联上QRS综合波的形态,对LAFB在胸前导联上的表现看法尚不一致,本文报告50例LAFB心电图SV_5的测量结果,并与非LAFB的心电图进行对照研究,以评价SV_5改变对LAFB的诊断价值。1 材料和方法 LAFB组:诊断条件为:①QRS综合波电轴左偏,额面电轴-30～-90°;②QRSⅠ、aVL呈qR型,但QⅠ、aVL不超过0.02秒,QRSⅡ、Ⅲ,aVF呈rS型,R_L>R_1,R_R;③QRS不增宽或轻度增宽,一般
Left anterior branch block (LAFB) clinical more common, the diagnosis is mainly based on the twelve lead electrocardiogram frontal left axis deviation (-30 °) and limb lead QRS complex wave morphology, the LAFB in the chest The performance of the lead on the view is not the same, the report of 50 cases of LAFB electrocardiogram SV_5 measurements and non-LAFB ECG were compared to evaluate the SV_5 changes in the diagnostic value of LAFB. 1 Materials and methods LAFB group: diagnostic conditions: ① QRS comprehensive wave axis left deviation, frontal axis -30 ~ -90 °; ② QRS Ⅰ aVL was qR type, but Q Ⅰ, aVL no more than 0.02 seconds, QRS Ⅱ, Ⅲ, aVF was rS type, R_L> R_1, R_R; ③QRS does not broaden or slightly widened, generally