<prompt> Ebsteins anomaly is caused byLithiumCarbamazepineImipramineAmphetamine  <response>: A Lithium Environmental factors found in studies include maternal exposure to benzodiazepines. Maternal lithium therapy can rarely lead to Ebsteins anomaly in the baby. About 10 of cases are associated with chronic maternal lithium use. About 20 of patients with Ebsteins anomaly have accessory electrical tissue which can cause episodes of heart racing, a condition known as Wolff-Parkinson-White syndrome WPW. Unusual and rare cyanotic congenital heart disease with diminished pulmonary blood flow results from an abnormality of the tricuspid valve. Posterior as well as the septal leaflet of the tricuspid valve is displaced downwards. Result is an attachment to the posterior wall of the right ventricle. In addition, the leaflets are malformed and fused resulting in obstruction to flow of blood into the right ventricle. Portion of the right ventricle above the leaflet attachment thins out and is called atrialized right ventricle. Right ventricular contraction is also abnormal. 