Lin C C, Schulman H, Saldana L R
Obstet Gynecol. 1978 Jun;51(6):666-70.
Internal FHR tracings of 259 patients with variable decelerations and 49 with late decelerations were analyzed for frequency and severity of the pattern in an attempt to correlate with fetal pH or Apgar score at 1 minute. A significant increase in the risk of fetal acidosis was associated with a frequency of greater than 30% variable decelerations and 20% late decelerations. It also increased with the increase of severity of the pattern. Variable decelerations are not good predictors of Apgar scores less than or equal to 6 at 1 minute, but late decelerations are predictive when they occur more than 20% of the time. The fetus with variable decelerations a normal pH can be observed through the first stage of labor with a high degree of confidence. However, when a 20% or more moderate-to-severe late deceleration/contraction ratio is present, intervention is necessary even if scalp blood pH is normal. The FHR deceleration/uterine contraction (UC) ratio is a simple bedside technique for assessing fetal outcome.
分析了259例出现变异减速和49例出现晚期减速患者的胎儿心率（FHR）内部描记图，以确定该模式的频率和严重程度，试图将其与胎儿1分钟时的pH值或阿氏评分相关联。当变异减速频率大于30%且晚期减速频率大于20%时，胎儿酸中毒风险显著增加。随着模式严重程度的增加，风险也会增加。变异减速不是1分钟时阿氏评分小于或等于6分的良好预测指标，但当晚期减速发生时间超过20%时，具有预测性。出现变异减速且pH值正常的胎儿在分娩第一阶段可被高度确信地观察。然而，当出现20%或更多的中度至重度晚期减速/宫缩比时，即使头皮血pH值正常也需要进行干预。胎儿心率减速/子宫收缩（UC）比是一种评估胎儿结局的简单床边技术。
