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Related Experiment Videos

Atrioventricular septal defects: possible etiologic differences between complete and partial defects.

C A Loffredo1, J Hirata, P D Wilson

  • 1Cancer Genetics and Epidemiology Program, Department of Oncology, Georgetown University School of Medicine, Washington, DC 20007, USA.

Teratology
|March 10, 2001
PubMed
Summary

Atrioventricular septal defects (AVSD) show distinct risk factors based on subtype. Maternal diabetes is a key risk factor for complete AVSD, while the atrial form is linked to family history and paternal radiation exposure.

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CYCLOPIA AND OTHER DEFECTS IN A FETUS WITH UNIQUE CHROMOSOMAL REARRANGEMENT.

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Area of Science:

  • Cardiology
  • Pediatric Cardiology
  • Medical Genetics
  • Epidemiology

Background:

  • Recent advancements in understanding atrioventricular septal defects (AVSD) necessitate detailed epidemiologic studies.
  • Previous AVSD research often grouped complete and partial subtypes, limiting subtype-specific risk factor analysis.
  • Investigating morphogenetic heterogeneity is crucial for understanding AVSD etiology.

Purpose of the Study:

  • To reanalyze existing data to identify distinct environmental and genetic risk factors for different AVSD subtypes.
  • To compare risk factor associations in complete AVSD versus atrial and ventricular forms of partial AVSD.
  • To explore potential heterogeneity in the causes of AVSD.

Main Methods:

  • Reanalysis of the Baltimore-Washington Infant Study data (1981-1989) for live-born cases and controls.

Related Experiment Videos

  • Stratified analysis of risk factors for complete AVSD (n=213), atrial partial AVSD (n=75), and ventricular partial AVSD (n=32).
  • Comparison of isolated cases, Down syndrome cases, and cases with Trisomy 18 across AVSD subtypes.

    • Main Results:

    • Complete and ventricular AVSD showed similar rates of isolated cases and high prevalence of Down syndrome.
    • The atrial form of partial AVSD had a higher proportion of isolated cases (55%).
    • Maternal diabetes (OR=20.6) and antitussive use (OR=8.8) were associated with complete AVSD; family history and paternal radiation with atrial partial AVSD.
    • Trisomy 18 was significantly associated with the ventricular form (22%) but not other AVSD subtypes.

    Conclusions:

    • Complete AVSD and ventricular partial AVSD share similar risk profiles, with a subset potentially linked to Trisomy 18.
    • Maternal diabetes is identified as a significant, potentially preventable risk factor for complete AVSD.
    • Distinct risk factor profiles suggest different etiologies for AVSD subtypes.