Tejani N, Mann L I, Bhakthavathsalan A, Weiss R R
Am J Obstet Gynecol. 1975 Aug 15;122(8):975-8. doi: 10.1016/0002-9378(75)90359-2.
bradycardia lasting more than 21/2 minutes with a decrease in FHR of more than 30 b.p.m. were observed in the course of 15 monitored labors. The mean fetal pH during the 20 minutes following the bradycardia (early recovery) was significantly less than the mean pH obtained 30 minutes or more after the bradycardia (late recovery). Various types of periodic heart rate changes were observed during the early recovery period but few persisted into late recovery. Vaginal delivery occurred in 13 of 15 patients. Two cesarean sections were performed for indications unrelated to the prolonged bradycardia. The 5 minute Apgar score of all 15 neonates was 7 or greater.
在15例监测分娩过程中，观察到心率过缓持续超过2分半钟且胎心率下降超过30次/分钟。心动过缓后20分钟（早期恢复）内的平均胎儿pH值显著低于心动过缓后30分钟或更长时间（晚期恢复）获得的平均pH值。在早期恢复阶段观察到各种类型的周期性心率变化，但很少持续到晚期恢复阶段。15例患者中有13例经阴道分娩。因与长时间心动过缓无关的指征进行了2次剖宫产。所有15例新生儿的5分钟阿氏评分均为7分或更高。
