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大多数新生儿的死亡是由于早产造成的。不足月分娩如能被阻止或延期,婴儿成活率较高。羟苄羟麻黄碱是一种β-肾上腺素能受体激动剂,美国食品和药物管理局现已批准用于抑制早产,静注和口服皆可。药理:子宫平滑肌的肾上腺素能受体,与血管、支气管一样为β_2受体,而心脏为β_1受体。羟苄羟麻黄碱兴奋β_2受体,但也作用于心脏;除舒张血管和松弛子宫肌外,本品可引起心动过速,对血压有时不变。脐带血样表明,羟节羟麻黄碱可进入胎儿循环。适应症:对妊娠少于20周的自然流产,产科医生一般不用药物抑制,因为多数胎儿情况异常。妊娠20周以上的分娩可根据胎儿成熟度和对母子的危险性确定用药物抑制。羟苄羟麻黄碱不用于希克氏
The death of most newborns is due to premature birth. Infertility If delivery can be stopped or postponed, the infant has a higher survival rate. Hydroxybenzydrine is a beta-adrenergic receptor agonist that is approved by the U.S. Food and Drug Administration to suppress preterm birth, intravenous and oral administration. Pharmacology: Uterine smooth muscle adrenergic receptors, like blood vessels, bronchial β_2 receptor, while the heart is β_1 receptor. Benzalkonium chloride is excited β_2 receptor, but also in the heart; in addition to diastolic blood vessels and relaxation of the uterine muscle, the product can cause tachycardia, sometimes unchanged blood pressure. Cord blood samples indicate that oxytocin can enter the fetal circulation. Indications: For spontaneous abortion less than 20 weeks gestation, obstetricians generally do not need drug suppression because most fetuses are abnormal. Births more than 20 weeks of gestation may be determined by drug suppression based on fetal maturity and the risk to the mother and child. Benzalkonium chloride is not used for Hick’s