单词：apex impulse
apex impulse的用法和样例：
例句
- On examination, he has a resting tachycardia and eidence of left entricular dilatation with a displaced apex beat and possible secondary mitral regurgitation.体检发现有静息时心动过速与左心室扩大依据，心尖搏动偏移，可能有二尖瓣返流。
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