Values of T/QRS ratio in pregnancies complicated by intrauterine growth restriction

To evaluate values of T/QRS ratio in normal pregnancies and those complicated by intrauterine growth restriction (IUGR) using non-invasive method with transabdominal electrodes. Assessment of fetal well-being in IUGR pregnancies.

Fetal electrocardiograms were recorded and analyzed by KOMPOREL software from ITAM (Zabrze, Poland) and T/QRS ratios were automatically calculated. Doppler velocimetry of the middle cerebral artery and umbilical artery was carried out. The study group consisted of IUGR pregnancies with normal cerebroplacental ratios (CPRs) (n=110), IUGR pregnancies with decreased CPRs (n=29), and healthy controls (n=549). Analyses were performed between the study groups and by gestational age. T/QRS ratio variables and CPRs were calculated. Analysis of variance and linear regression were performed.

Maximum values, maximum minimal value differences, and standard deviations of T/QRS ratio were significantly different between the IUGR group with reduced CPRs and normal CPRs (P=0.0009, P=0.0000, P=0.0034, respectively) as well as between the IUGR group with reduced CPRs and healthy controls (P=0.0000, P=0.0001, P=0.0009, respectively). Mean maximum values in the IUGR group with reduced CPRs exceeded normal values.

T/QRS ratio may be useful in assessing fetal well-being in IUGR pregnancies; however, future studies are needed to determine typical ranges of T/QRS ratio in pregnancies complicated by IUGR.