Southall D P, Richards J, Hardwick R A, Shinebourne E A, Gibbens G L, Thelwall-Jones H, de Swiet M, Johnston P G
Arch Dis Child. 1980 Jul;55(7):506-11. doi: 10.1136/adc.55.7.506.
The fetal heart beat, detected by ultrasound, was recorded for five minutes from 934 antenatal women--266 at 30 to 35 weeks' gestation and 718 at 36 to 41 weeks. Episodes of bradycardia < 100/minute ranging from 5-30 seconds' duration occurred in 3 (1.1%) of the former and in 9 (1.3%) of the latter group. Tachycardia > 180/minute ranging from 30-90 seconds' duration occurred in 1 (0.4%) of the former and in 4 (0.6%) of the latter. Premature beats were not detected between 30 and 35 weeks, but occurred in 12 (1.7%) of 720 at 36 to 41 weeks' gestation. 50 subjects were monitored at both 30 and 35 weeks and 36 to 41 weeks' gestation and in one woman premature beats were present in the latter but not in the former recording. The incidence (1.7% of premature beats in the fetus at 36 to 41 weeks' gestation was similar to that in the healthy neonate (0.8%). Recordings of arrhythmias or rates outside the range 100-180/minute were replayed through a standard antepartum fetal heart rate monitor. The monitor failed to detect premature beats, 2 to 4 episodes of tachycardia > 180/minute, and 9 of 12 episodes of bradycardia < 100/minute, stressing its unreliability for detecting rapidly changing rates.
对934名产前女性进行了超声检测胎儿心跳，并记录5分钟。其中，266名处于妊娠30至35周，718名处于妊娠36至41周。前一组中有3名（1.1%）出现了持续5 - 30秒、心率<100次/分钟的心动过缓情况，后一组中有9名（1.3%）出现了这种情况。前一组中有1名（0.4%）出现了持续30 - 90秒、心率>180次/分钟的心动过速情况，后一组中有4名（0.6%）出现了这种情况。在30至35周未检测到早搏，但在妊娠36至41周的720名孕妇中有12名（1.7%）出现了早搏。对50名孕妇在妊娠30至35周以及36至41周时均进行了监测，其中1名孕妇在后者的记录中有早搏，而在前者记录中没有。妊娠36至41周胎儿早搏的发生率（1.7%）与健康新生儿的发生率（0.8%）相似。心律失常或心率超出100 - 180次/分钟范围的记录通过标准的产前胎儿心率监测仪进行回放。该监测仪未能检测到早搏、2至4次心率>180次/分钟的心动过速发作以及12次心率<100次/分钟的心动过缓发作中的9次，凸显了其在检测快速变化心率方面的不可靠性。
