Lilja H, Greene K R, Karlsson K, Rosén K G
Br J Obstet Gynaecol. 1985 Jun;92(6):611-7. doi: 10.1111/j.1471-0528.1985.tb01400.x.
Waveform changes in the fetal electrocardiogram (ECG) are under reassessment as a means of fetal surveillance. The purpose of the study was to identify ST waveform changes from the fetal scalp lead during labour and to compare any change with conventional signs of fetal distress. Two scalp electrodes provided a sufficiently stable signal from which ST waveform changes could be identified and measured as the T/QRS ratio. No infant was clinically hypoxic. Only 26% of the 46 patients studied had a continuously normal CTG whereas 67% had no ST waveform abnormalities. A relation was found between the two variables as the mean T/QRS ratio increased from 0.20 (SD 0.11) during epochs of normal CTG to 0.27 (SD 0.17) with CTG changes. A linear correlation (r = 0.58, P less than 0.01) was found between the T/QRS ratio before birth and the cord plasma lactate values.
胎儿心电图（ECG）波形变化作为一种胎儿监护手段正在重新评估中。本研究的目的是识别分娩期间胎儿头皮导联的ST波形变化，并将任何变化与胎儿窘迫的传统体征进行比较。两个头皮电极提供了足够稳定的信号，从中可以识别出ST波形变化并将其测量为T/QRS比值。没有婴儿出现临床缺氧情况。在研究的46例患者中，只有26%的患者连续CTG正常，而67%的患者没有ST波形异常。随着平均T/QRS比值从正常CTG时期的0.20（标准差0.11）增加到CTG变化时的0.27（标准差0.17），发现这两个变量之间存在关联。出生前的T/QRS比值与脐血血浆乳酸值之间存在线性相关性（r = 0.58，P<0.01）。
