Table 2: Fetal cardiac time intervals.

CharacteristicsStudy group
measurements
mean ± SD (ms)
Control group
measurements
mean ± SD (ms)
Statistical
significance
( -test)

Fetal heart rate (beats per minute)135 ± 10135 ± 10ns
P wave53 ± 1558 ± 13ns
PQ segment56 ± 1049 ± 10
PR interval109 ± 17107 ± 15ns
QRS complex53 ± 752 ± 7ns
T wave 168 ± 52* 140 ± 28#ns
QT interval 261 ± 49* 232 ± 35#ns

*n = 21 measurements, #n = 18 measurements.