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Familial congenital complete heart block and maternal systemic lupus erythematosis
Insights
Congenital complete heart block in siblings, with heart issues in the father and grandfather, suggests environmental factors, not just genetics, may cause familial heart block.
Area of Science:
- Cardiology
- Genetics
- Immunology
Background:
- Familial complete heart block (FCHB) is a rare condition affecting cardiac electrical conduction.
- Previous understanding suggested a purely genetic basis for congenital-onset FCHB.
Observation:
- A family presented with two siblings diagnosed with congenital complete heart block (CCHB) and congestive heart failure.
- The father and paternal grandfather exhibited adult-onset conduction defects.
- The mother was diagnosed with systemic lupus erythematosus (SLE).
Findings:
- The observed family case suggests a complex interplay between genetic predisposition and environmental influences in FCHB.
- Literature review indicates that maternal factors, such as SLE, may play a significant role in congenital-onset FCHB, challenging the 'purely genetic' hypothesis.
- This highlights potential autoimmune or inflammatory contributions to familial heart block.
Implications:
- Revisiting the etiology of FCHB to include environmental and maternal factors is crucial for accurate diagnosis and risk assessment.
- Understanding these interactions can lead to improved management strategies for affected families.
- Further research into the maternal-fetal transmission of cardiac conduction defects is warranted.
Abstract:
A family is reported in which two siblings had congenital complete heart block with resultant congestive heart failure, the father and paternal grandfather show adult-onset conduction defects, and the mother has systemic lupus erythematosis. The interaction of heredity and environment is discussed in this context. A review of the literature on familial complete heart block suggests that so-called pure congenital-onset familial heart block, originally felt to be genetic, may in fact have an important enivronmental component, specifically related to ongoing maternal factors such as systemic lupus erythematosis.