Results The ECG waves by fetal electrocardiograph were 5~15 times higher than those by common electrocardiograph, which had significant difference statistically.
结果胎儿心电图机描记的图形较普通心电图机描记的图形高5～ 15倍，差异显著；
3
Thus, an electrocardiograph usually can not record transient and anomalous ECG which appears accidentally and is of diagnostic significance.