Reduced Heart Rate Variability and Altered Cardiac Conduction after Pre-Eclampsia

Area of Science:

• Cardiology
• Obstetrics
• Reproductive Medicine

Background:

• Pre-eclampsia (PE) is a hypertensive disorder of pregnancy.
• PE is linked to increased maternal cardiovascular disease (CVD) risk.
• Pregnancy alters cardiac parameters, but postpartum recovery is not fully understood.

Purpose of the Study:

• To assess postpartum electrocardiogram (ECG) parameters after normal pregnancy.
• To investigate the long-term effects of pre-eclampsia history on postpartum ECG parameters.
• To identify early markers for CVD risk in women with a history of PE.

Main Methods:

• High-resolution orthogonal Holter ECG recordings (1000 Hz) for 10 minutes.
• Measurement of heart rate variability (HRV).
• Determination of signal-averaged P-wave and QRS complex durations in non-pregnant controls, normotensive parous controls, and women with a recent PE history.

Main Results:

• Heart rate variability (HRV) reduction from pregnancy normalized in controls but persisted in women with PE history at 6-8 months postpartum.
• P-wave and QRS complex durations were prolonged in women with PE history compared to controls.
• QRS duration prolongation was independent of blood pressure differences.

Conclusions:

• Women with a history of PE exhibit reduced HRV and prolonged ECG durations postpartum.
• These ECG alterations suggest increased sympathetic cardiac activity and delayed myocardial conduction.
• Findings indicate potential cardiac remodeling and increased arrhythmia risk, highlighting opportunities for early CVD screening in this population.