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凡能改变心脏动力学的因素,均可影响STI,但其作用不外乎改变下面四个基本因素:前负荷、后负荷、心脏的收缩能力及心率。1.影响前负荷的因素:主动脉瓣闭锁不全,二尖瓣闭锁不全,二尖瓣狭窄,左房粘液瘤,斜卧或直立位,妊娠晚期,利尿药,左心衰竭,房颤。2.影响后负荷的因素:主动脉瓣狭窄或闭锁不全,特发性肥大性主动脉瓣下狭窄,高血压,缩血管及扩血管药。
Anything that changes cardiac dynamics can affect STI, but its effect is nothing more than changing the four underlying factors: preload, postload, heart contractility, and heart rate. 1. Factors affecting the preload: aortic valve atresia, mitral regurgitation, mitral stenosis, left atrial myxoma, skewed or upright position, late pregnancy, diuretics, left heart failure, atrial fibrillation. Factors affecting afterload: aortic stenosis or atresia, idiopathic hypertrophic aortic stenosis, hypertension, vasoconstriction and vasodilators.