Unidentified multiple congenital abnormalities in twins. A population-based Hungarian study

Area of Science:

• Medical Genetics
• Pediatrics
• Obstetrics

Background:

• Multiple congenital abnormalities (MCAs) are a significant concern in pediatric health.
• Twinning rates vary globally and can be influenced by various factors.
• Previous research has explored potential associations between MCAs and twinning.

Purpose of the Study:

• To determine if there is an increased rate of twinning among infants with multiple congenital abnormalities.
• To investigate potential shared etiologies between MCAs and twinning.

Main Methods:

• Retrospective analysis of 1038 index patients diagnosed with multiple congenital abnormalities.
• Comparison of observed twinning rates with the general Hungarian birth rate.
• Statistical analysis after excluding specific confounding factors like low birth weight and male genital anomalies.

Main Results:

• A total of 34 twin pairs (3.3%) were identified among the 1038 index patients.
• This observed rate was higher than the Hungarian general birth twinning rate of approximately 2.1%.
• After exclusions, the adjusted twinning rate was 1.8%, suggesting no significant association with unidentified MCAs.

Conclusions:

• The initial higher twinning rate in MCAs is likely due to confounding factors, not a shared cause.
• Unidentified multiple congenital abnormalities do not appear to have a common etiological link with twinning.
• Further research may be needed to explore specific types of congenital anomalies and their potential association with twinning.