Cardiac anomalies-heterotaxy syndrome

Cardiac anomalies-heterotaxy syndrome, also known as heterotaxy syndrome with cardiac anomalies, is a rare congenital disorder characterized by abnormal arrangement (situs) of the internal organs, particularly affecting the heart and great vessels. In this condition, the normal left-right asymmetry of the body is disrupted, leading to complex cardiac malformations that may include transposition of the great arteries, atrioventricular septal defects, anomalous pulmonary venous return, double outlet right ventricle, and single ventricle physiology. The syndrome may present as either left isomerism (polysplenia syndrome) or right isomerism (asplenia syndrome), each associated with distinct patterns of cardiac and extracardiac abnormalities. Beyond the heart, heterotaxy syndrome can affect the arrangement of the lungs (bilateral bilobed or trilobed lungs), spleen (asplenia or polysplenia), liver (midline liver), and gastrointestinal tract (intestinal malrotation). Patients with asplenia are particularly vulnerable to overwhelming bacterial infections due to the absence of splenic immune function. The severity of the condition varies widely depending on the specific combination of cardiac and visceral anomalies present. Diagnosis is typically made in the neonatal period through echocardiography, often supplemented by cardiac MRI or CT imaging. Treatment is primarily surgical and may require staged cardiac operations, including palliative procedures such as the Fontan pathway for single ventricle physiology. Antibiotic prophylaxis is essential for patients with asplenia. Despite advances in surgical techniques, the prognosis remains guarded for patients with complex cardiac anatomy, and long-term follow-up with a multidisciplinary team including cardiologists, surgeons, and immunologists is necessary.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

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