Heart-hand syndrome

Heart-hand syndrome (Orphanet code 228184) is a group of rare genetic disorders characterized by the co-occurrence of congenital heart defects and limb (particularly hand and forearm) abnormalities. This designation encompasses several distinct clinical entities in which cardiac and upper limb malformations present together, reflecting shared developmental pathways during embryogenesis. The most well-known subtypes include Holt-Oram syndrome (heart-hand syndrome type I), which is caused by mutations in the TBX5 gene, as well as other rarer forms. The cardiac manifestations typically include atrial and ventricular septal defects, conduction abnormalities (such as atrioventricular block), and other structural heart malformations. Upper limb anomalies range from subtle findings such as triphalangeal or absent thumbs to more severe defects including radial ray abnormalities, hypoplastic or absent radius, and phocomelia. The severity of both cardiac and limb involvement is highly variable, even within the same family. Diagnosis is typically made in the neonatal period or during childhood based on clinical findings, echocardiography, skeletal radiographs, and genetic testing. Management is multidisciplinary and depends on the specific manifestations present. Cardiac defects may require surgical repair or medical management of arrhythmias, while limb abnormalities may benefit from orthopedic interventions, occupational therapy, or reconstructive surgery. Genetic counseling is recommended for affected individuals and their families. There is currently no cure, and treatment remains supportive and symptom-directed.

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

Common questions about Heart-hand syndrome