Cardiac and noncardiac malformations: observations in a population-based study

Area of Science:

• Medical Genetics
• Pediatric Cardiology
• Birth Defects Research

Background:

• Congenital cardiovascular malformations (CCVMs) are a significant cause of infant morbidity and mortality.
• Understanding the genetic and etiological factors associated with CCVMs is crucial for prevention and early intervention.

Purpose of the Study:

• To investigate the association between CCVMs and other congenital abnormalities, including chromosomal and syndromic disorders.
• To identify non-cardiac anomalies that frequently co-occur with CCVMs.

Main Methods:

• A regional case-control study comparing infants with confirmed CCVMs to a representative sample of healthy infants.
• Data collection included echocardiography, cardiac catheterization, surgery, autopsy reports, physician records, maternal interviews, and death certificates.
• Detailed phenotyping for both cardiac and non-cardiac abnormalities was performed.

Main Results:

• Chromosomal abnormalities (especially involving chromosomes 13, 18, and 21) and syndromes/heritable disorders were significantly more frequent in cases with CCVMs (P < 10^-4).
• Nonsyndromic abnormalities were three times more common in CCVM cases (P < .005).
• Excesses of central nervous system malformations, eye disorders, abdominal wall defects, and alimentary/urinary tract anomalies were observed in CCVM cases.

Conclusions:

• CCVMs are strongly associated with a wide range of genetic and syndromic conditions.
• Specific combinations of cardiac and midline anomalies may represent variants of known syndromes.
• Certain non-cardiac anomalies, like cleft lip/palate and hernias, appear to be associated with CCVMs by chance.