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妊娠时,血容量、血浆容量和心排出量分别约增加30％、40％和30～50％,心率可增加到100次/分,血压在妊娠后期亦可轻度增高,其他尚有钠潴溜和体液增加、横膈抬高而影响呼吸功能以及基础代谢增高等。在分娩期,虽因子宫收缩使心排出量增加20％,由于心率相应增加,心搏量仍维持原状。产褥期时最初因子宫窦血液排空而使血容量和静脉压升高,利尿后体液下降,血容量亦随之减少心脏病患者对这些由妊娠引起生理改变所增加的额外负荷,在一定的程度上不能适应。妊娠兼有心脏病的发生率为1～3％,其中以风湿性心脏病为最多,达85％(二尖瓣狭窄占3/4,余为混合性瓣膜病),其次为先
Pregnancy, blood volume, plasma volume and cardiac output were increased by about 30%, 40% and 30 to 50%, heart rate can be increased to 100 beats / min, blood pressure in the latter part of pregnancy may also be mildly increased, the other still sodium retention Slip and increase body fluid, diaphragmatic elevation affect the respiratory function and increased basal metabolism. In childbirth, although the contraction of the uterus to cardiac output increased by 20%, due to a corresponding increase in heart rate, stroke volume remained the same. During the puerperium, blood volume and venous pressure rise due to emptying of the blood of the uterine sinus initially. After diuresis, the body fluid drops and the blood volume decreases. As a result, the additional burden of heart disease on these physiological changes caused by pregnancy is increased to a certain extent Can not adapt. The incidence of both heart disease in pregnancy is 1 to 3%, of which the most as rheumatic heart disease, up to 85% (mitral stenosis accounted for 3/4, the remaining mixed valvular disease), followed by the first