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Atrioventricular block during fetal heart rate decelerations
M P Mohajer1, D S Sahota, N N Reed
1Department of Obstetrics and Gynaecology, University Hospital, Nottingham.
Archives of Disease in Childhood. Fetal and Neonatal Edition
|January 1, 1995
Summary
Fetal electrocardiograms (ECG) revealed significant findings during labor decelerations. Complete atrioventricular heart block was observed in seven fetuses, potentially linked to hypoxia affecting the bundle of His.
Area of Science:
- Cardiology
- Fetal Medicine
- Obstetrics
Background:
- Fetal heart rate decelerations during labor are common.
- Understanding the underlying mechanisms is crucial for fetal well-being.
- Electrocardiograms provide detailed insights into fetal cardiac electrical activity.
Purpose of the Study:
- To investigate fetal cardiac electrical activity during labor decelerations.
- To identify specific electrocardiogram (ECG) patterns associated with decelerations.
- To explore potential causes of severe cardiac events during labor.
Main Methods:
- Electrocardiograms (ECG) were performed on 15 fetuses experiencing labor decelerations.
- Analysis focused on P wave and QRS complex relationships.
- Correlation of ECG findings with fetal heart rate patterns.
Main Results:
- Sinus bradycardia was observed in six fetuses.
- P wave inversion occurred in two cases.
- Complete atrioventricular heart block (P wave dissociated from QRS) was identified in seven fetuses.
Conclusions:
- Complete atrioventricular heart block during fetal decelerations may be caused by hypoxia impacting the bundle of His.
- While many decelerations are vagally mediated, severe blocks suggest other etiologies.
- ECG analysis is vital for diagnosing complex fetal cardiac events during labor.