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[Fetal bradycardia: a retrospective study in 9 Spanish centers]
F Perin1, M M Rodríguez Vázquez del Rey1, L Deiros Bronte2
1Unidad de Cardiología Pediátrica, Hospital Universitario Virgen de las Nieves, Granada, España.
Anales De Pediatria (Barcelona, Spain : 2003)
|February 20, 2014
Summary
Fetal bradycardia management varies, with sinus bradycardia linked to serious illness and atrioventricular block having high mortality. Blocked atrial bigeminy generally has a good prognosis but requires monitoring for potential tachyarrhythmias.
Area of Science:
- Perinatal Medicine
- Fetal Cardiology
- Neonatal Health
Background:
- Fetal bradycardia presents diagnostic and management challenges.
- Understanding underlying mechanisms is crucial for predicting outcomes.
Purpose of the Study:
- To review current management and outcomes of fetal bradycardia.
- To analyze different types of fetal bradyarrhythmias across multiple centers.
Main Methods:
- Retrospective multicenter study of 37 fetuses diagnosed with bradycardia (Jan 2008-Sep 2010).
- Echocardiography used to investigate mechanisms of fetal bradyarrhythmias.
- Analysis of management strategies and outcomes, including mortality and interventions.
Main Results:
- Sinus bradycardia cases (3) were associated with serious diseases.
- Blocked atrial bigeminy (15 cases) showed excellent outcomes, barring one instance of post-natal tachyarrhythmia.
- High-grade atrioventricular blocks (19 cases) had significant mortality (20%, 37% with pregnancy terminations), linked to congenital heart defects, hydrops, or ventricular dysfunction. Maternal SSA/Ro antibodies were implicated in 63% of immune-mediated cases.
- Pacemaker implantation occurred in 58% of atrioventricular blocks within 18 months.
Conclusions:
- Comprehensive evaluation is necessary for all sustained fetal bradycardia cases.
- Blocked atrial bigeminy has a favorable prognosis, though tachyarrhythmia risk exists.
- High-grade atrioventricular block management remains controversial due to significant mortality and morbidity.
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