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分娩前或分娩过程中胎粪污染羊水常是一种代偿性胎儿宫内窘迫的征象,至少可认为是胎儿对一时性缺氧或迷走神经受刺激的反应。胎儿的肠蠕动和肛门括约肌的活动是受副交感自主神经系统和肾上腺能α-受体控制的,而它们对缺氧甚为敏感。产时胎儿心动过速不是胎儿窘迫的征象,却常与母体发烧、应用阿托品或β-肾上腺能宫缩缓解剂有关。胎粪排出而胎儿心率正常显然不是胎儿窘迫的征兆,因排粪可在生理情况下出现,刚好在娩出之前而不是娩出之后开始排出胎粪。只有胎粪污染并发胎心率异常,如心动过缓、晚期心率减缓(简称
Prenatal or prenatal meconium-stained amniotic fluid is often a sign of compensatory fetal distress, at least the fetus may be considered as a temporary hypoxia or vagus nerve irritation response. Peristalsis and anal sphincter activity in the fetus is controlled by the parasympathetic autonomic nervous system and the adrenergic alpha -receptor, and they are very sensitive to hypoxia. Fetal tachycardia during labor is not a sign of fetal distress, but often with maternal fever, atropine or β-adrenergic contractions agent can be related. Metrorrhagia and normal fetal heart rate apparently is not a sign of fetal distress, because defecation can occur in physiological conditions, just before delivery rather than after the start of discharge of meconium. Only fetal fecal contamination with abnormal fetal heart rate, such as bradycardia, late slow heart rate (referred to as