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Transient non-autoimmune fetal heart block
Johannes M P J Breur1, Martijn A Oudijk, Philip Stoutenbeek
1Department of Obstetrics, Wilhelmina Children's Hospital/U MC, Utrecht, The Netherlands. hans_breur@hotmail.com
Fetal Diagnosis and Therapy
|February 5, 2005
Summary
Transient fetal heart block can occur in structurally normal hearts without maternal autoantibodies. This rare condition appears benign, resolving spontaneously in all reported cases.
Area of Science:
- Cardiology
- Maternal-Fetal Medicine
- Pediatric Electrophysiology
Background:
- Fetal heart block is typically irreversible, linked to congenital heart defects or maternal autoantibodies (SS-A/Ro, SS-B/La), causing permanent atrioventricular node damage.
- This study presents the first report of transient fetal heart block in structurally normal hearts without maternal autoantibodies.
Observation:
- Four cases of fetal heart block were observed over 14 years.
- Patients presented with fetal bradycardia (70-85 bpm) or abnormal triple test results.
- Echocardiography revealed complete or second-degree atrioventricular block, with spontaneous resolution in all cases.
Findings:
- All four fetuses had structurally normal hearts, normal cardiac function, and no signs of hydrops fetalis.
- Maternal testing for SS-A/Ro and SS-B/La autoantibodies was negative in all cases.
- Postnatal ECG confirmed normal sinus rhythm, indicating complete resolution of the heart block.
Implications:
- Fetal heart block can occur transiently and benignly, even without identifiable structural heart defects or maternal autoantibodies.
- The unknown etiology of this transient heart block warrants further investigation.
- These findings suggest a favorable prognosis for fetal heart block in the absence of structural abnormalities or maternal autoantibodies.