Lithium-induced Ebstein's Anomaly

Area of Science:

• Cardiology
• Developmental Biology
• Teratology

Background:

• Ebstein's anomaly (EA) is a rare congenital heart defect characterized by malformation of the tricuspid valve leaflets.
• The etiology of EA is multifactorial, including genetic mutations (e.g., NKX2-5) and environmental factors.
• Prenatal exposure to certain teratogens, such as lithium, has been implicated in congenital heart defects.

Observation:

• This report details an adolescent male with an undiagnosed case of Ebstein's anomaly.
• The patient had a history of lithium exposure during the critical period of organogenesis.
• This case underscores the importance of considering teratogenic exposures in the etiology of congenital cardiac anomalies.

Findings:

• The case presents a correlation between prenatal lithium exposure and the development of Ebstein's anomaly in an adolescent.
• This highlights a potential, though not definitively proven, teratogenic link between lithium and EA.
• The delayed diagnosis in adolescence suggests EA can present later in life.

Implications:

• This case emphasizes the need for vigilance in identifying potential teratogenic causes of congenital heart defects.
• Further research is warranted to elucidate the specific mechanisms by which lithium may contribute to EA.
• Clinicians should consider maternal lithium use during pregnancy when evaluating patients with Ebstein's anomaly.