引起主波向下范围扩大与导致电轴左偏的病因基本相同。

The expansion of the downward main wave scope and the left axis deviation proved to have the same cause.

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其余心率、QRS间期、Q-T间期的数值以及窦性心动过缓、窦性心动过速和心电轴左偏等发生率，两组之间均无差异（P＞0．05）。

No significant differences were found in the heart rate, QRS intervals, Q T intervals, sinus bradycardia, sinus tachycardia and left axis deviation between exposed and control groups ( P >0 05).

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与正常窦性心律时的额面平均心电轴比较，RVIS起搏时接近正常，RVOT起搏时电轴呈右偏趋势，RVA起搏时呈左偏趋势。

The QRS axis was of no significant difference between RVIS pacing and sinus rhythm. However, there were tendency toward right deviation at RVOT pacing and toward left deviation at RVA pacing.

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