The electrocardiogram in pregnancy

This study set out to assess the change in frontal plane ECG axes during pregnancy in a cross sectional study and to determine if there were any maternal factors that might affect the ECG. In addition, the change in ECG axes immediately before and 48 hours after delivery was also studied. ECGs from 149 women with average age 29.4 ± 6.0 years were analysed. 18 women had an ECG recorded before and after delivery. 50% of women were obese or morbidly obese. Body mass index correlated with QRS axis (r=-0.32, p<;0.001) and T axis (r=-0.28, p<;0.004). The mean QRS and T axes in pregnancy were 14° and 17° superior to the normal values respectively (p<;0.001). The mean QRS and T axes shifted inferiorly by 5° and 12° respectively after delivery (p<;0.01). Serial ECG recordings are needed to enhance ECG recording in pregnancy where required.