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妊娠期吸烟是胎儿在子宫内生长迟缓的一个重要原因。这是由于烟碱有血管收缩作用,可使胎盘血流量减少,从而引起慢性缺氧;和因胎儿及母血中的碳氧血红蛋白量增加而使氧的可用性降低。在非妊娠的成人中,吸烟与血液粘稠度增高及动脉的供血不足有关,从而影响到很多器官。本文研究了母亲吸烟对胎儿血液粘稠度的影响,并观察子宫内生长迟缓是否与吸烟及胎儿的血液粘稠度增加有关。患者,方法及结果:从在整个妊娠期每天吸烟>20支的母亲所生育的40个婴儿的脐静脉中采血,对照组为40例配对的不吸烟母亲所生育的婴儿。用
Smoking during pregnancy is an important reason for the slow growth of the fetus in the uterus. This is due to the vasoconstriction of nicotine that reduces placental blood flow resulting in chronic hypoxia; and reduced availability of oxygen due to increased amounts of carboxyhemoglobin in the fetus and maternal blood. In non-pregnant adults, smoking is associated with increased blood viscosity and inadequate arterial blood supply, affecting many organs. This article studies the effects of maternal smoking on fetal blood viscosity and observes whether intrauterine growth retardation is associated with increased smoking and increased fetal blood viscosity. PATIENTS, METHODS, AND RESULTS: Blood was drawn from umbilical veins of 40 infants born to mothers who smoked> 20 cigarettes a day throughout pregnancy, in the control group as infants born to 40 paired non-smokers. use