Isolated right ventricular hypoplasia

Isolated right ventricular hypoplasia (also known as isolated hypoplasia of the right ventricle) is a rare congenital heart defect characterized by underdevelopment (hypoplasia) of the right ventricle without other major associated structural cardiac anomalies such as pulmonary atresia with intact ventricular septum or Ebstein anomaly. In this condition, the right ventricle is abnormally small and may have reduced capacity to pump blood effectively to the lungs for oxygenation. This leads to impaired pulmonary blood flow and can result in right-to-left shunting of blood through a patent foramen ovale or atrial septal defect, causing cyanosis (bluish discoloration of the skin due to low oxygen levels). Clinical features typically present in the neonatal period and may include cyanosis, signs of right heart failure such as hepatomegaly and peripheral edema, exercise intolerance, and fatigue. The severity of symptoms depends on the degree of right ventricular underdevelopment and the adequacy of compensatory mechanisms such as atrial-level shunting. Some milder cases may not be detected until later in infancy or childhood. Management depends on the severity of the condition. In neonates with significant cyanosis, prostaglandin E1 may be administered to maintain ductal patency and ensure adequate pulmonary blood flow. Surgical interventions can range from palliative procedures (such as a Blalock-Taussig shunt or bidirectional Glenn procedure) to a one-and-a-half ventricle repair or, in severe cases, a Fontan-type single ventricle palliation pathway. In cases where the right ventricle has sufficient growth potential, a biventricular repair may be achievable. Long-term follow-up with a cardiologist experienced in congenital heart disease is essential, as patients may require additional interventions over their lifetime.

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