Key points are not available for this paper at this time.
众所周知,第一心音的响度受PR间期长短以及心室收缩瞬间房室瓣瓣叶位置的影响,但该现象的确切机制尚未得到满意的解释。
Leech et al. (Fri,) 对这一问题进行了研究。
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