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Isolated hypoplastic left heart syndrome in three siblings
1Department of Obstetrics and Gynecology, Northwestern University Medical School, Chicago, Illinois, USA.
Obstetrics and Gynecology
|October 1, 1996
Summary
Recurrent isolated hypoplastic left heart syndrome in siblings suggests an autosomal recessive inheritance pattern. This finding indicates a higher recurrence risk than previously estimated, impacting genetic counseling for affected families.
Area of Science:
- Medical Genetics
- Pediatric Cardiology
Background:
- Hypoplastic left heart syndrome (HLHS) is a complex congenital heart defect.
- The genetic basis for recurrent isolated HLHS remains poorly understood.
- Previous reports of familial recurrence are infrequent.
Observation:
- A family experienced three instances of isolated HLHS across pregnancies.
- The affected fetus in the first pregnancy had normal chromosomes and no extracardiac anomalies.
- Subsequent pregnancies resulted in one healthy neonate and two additional HLHS diagnoses.
Findings:
- The recurrence of isolated HLHS in three siblings suggests an autosomal recessive mode of inheritance.
- This pattern implies a genetic etiology for this specific presentation of HLHS.
- The observed familial clustering deviates from typical sporadic occurrences.
Implications:
- The recurrence risk for parents with an affected infant may exceed the previously quoted 2%.
- Genetic counseling for HLHS should consider the possibility of a higher recurrence risk in familial cases.
- This study highlights the need for further research into the genetic factors underlying HLHS recurrence.