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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...