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虽然,反流出现于二尖瓣关闭不全病人的收缩期和主动脉关闭不全病人的舒张期。但此两种血流的分布主要由全身血管阻力的大小决定。众所周知,阻力增加时反流的血量增加、反流的杂音增强。蹲位和紧握拳可加强反流性杂音。苯福林为α-促效药,增加周围动脉平滑肌的张
Although, reflux occurs in patients with mitral regurgitation in patients with systolic and aortic insufficiency in patients with diastolic phase. However, the distribution of these two blood flow is mainly determined by the size of systemic vascular resistance. As we all know, increased resistance to increase the amount of blood reflux, enhanced reflux noise. Squatting and clenching fist can strengthen the reflux murmur. Phenylephrine is an α-agonist and increases the tension of peripheral arterial smooth muscle