Spencer J A, Belcher R, Dawes G S
Eur J Obstet Gynecol Reprod Biol. 1987 May;25(1):29-34. doi: 10.1016/0028-2243(87)90089-x.
A comparison between the computer analyses of records of the fetal heart rate (FHR) obtained simultaneously by pulsed doppler ultrasound with autocorrelation and by fetal scalp electrocardiogram (ECG) in labour showed no statistical differences when signal loss was less than 2%. Increasing signal loss, due to maternal movement, correlated significantly with greater differences between ultrasound and ECG values for mean FHR variation (r = 0.58, p less than 0.005). With higher signal loss (average 15.6%) the mean FHR variation measured by ultrasound was significantly lower than that measured by ECG (T = 3.83, p less than 0.005) but this reduction was not of clinical significance.
对分娩时通过自相关脉冲多普勒超声和胎儿头皮心电图（ECG）同时获得的胎儿心率（FHR）记录进行计算机分析比较，结果显示，当信号丢失小于2%时，两者无统计学差异。由于母体运动导致的信号丢失增加，与超声和心电图测量的平均FHR变化值之间的差异增大显著相关（r = 0.58，p < 0.005）。当信号丢失较高（平均15.6%）时，超声测量的平均FHR变化显著低于心电图测量值（T = 3.83，p < 0.005），但这种降低无临床意义。
