ECG parameters in pregnancy

Normal ECG data for pregnancy, which may partially relate to changes in the position of the heart, include:

• Atrial and ventricular ectopic rhythms.
• Q-wave (small) and inverted T-wave in lead III.
• Depression of the ST segment.
• Shorter than normal, PR interval.
• Inversion of the T-wave in the lower and lateral directions.
• Shift to the left of the QRS.
• The electric axis of the heart is turned to the left.
• The heart rate is higher than normal.