概括
左捆支部阻塞 (LBBB) 改变了 mitra 和三角关闭的时间,影响了第一个心声. 这项研究发现,在LBBB患者中,心肌关闭延迟并降低了第一心脏声音强度.
科学领域:
- 心脏病学 心脏病学
- 心脏电生理学 心脏电生理学
- 心声回声扫描 (Echocardiography) 是一种心声回声扫描.
背景情况:
- 第一个心脏声音来自于 mitra 和 tricuspid 门的关闭.
- 众所周知,左束枝断 (LBBB) 影响心脏电导和机械功能.
研究的目的:
- 为了研究LBBB对中和三管关闭时间的影响.
- 描述LBBB患者第一个心脏声音的性质.
主要方法:
- 使用了心声声谱,心脏顶部图和缩时间间隔.
- 26名LBBB患者与20名健康受试者进行了比较.
主要成果:
- 由于LBBB导致了 mitra 关闭的变量延迟,导致正常,逆向或与三管同时关闭.
- 在LBBB患者 (0.074s vs 0.057s) 中,脱极化到 mitra 关闭的间隔显著延长 (0.074s vs 0.057s).
- 第一个心脏声音强度在LBBB中降低了,与模糊的 mitra和三柱组成部分.
结论:
- 由于心室激活发生变化,LBBB破坏了正常的门序列,并延迟了关闭.
- 延迟的左心室收缩和增加的同度收缩时间有助于这些发现.
- 这些LBBB的电机变化直接影响了第一个心声的特征.
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