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Intelligence and hypoxemia in children with congenital heart disease: fact or artifact?
Insights
Children with congenital heart disorders who have cyanosis (blueish skin due to low oxygen) show lower intelligence scores than acyanotic children. This intelligence gap persists even when accounting for other health factors.
Area of Science:
- Pediatric Cardiology
- Neurodevelopmental Pediatrics
- Congenital Heart Disease
Background:
- Previous research linked lower intelligence in children with congenital heart disorders (CHDs) to hypoxemia.
- Key factors like neurologic/genetic disorders, surgery, sickness severity, age, sex, and social class were inconsistently examined.
Purpose of the Study:
- To investigate the relationship between cyanosis and intelligence in children with CHDs.
- To determine if intelligence differences persist after excluding children with abnormal neurologic exams or those who had definitive surgery.
Main Methods:
- Studied 82 consecutively admitted children with CHDs.
- Excluded children with abnormal neurologic examinations and those who received definitive surgery.
- Compared intelligence quotients (IQs) between cyanotic and acyanotic groups.
Main Results:
- Acyanotic children had significantly higher IQs (112.81 ± 14.52) than cyanotic children (103.50 ± 15.81).
- Cyanotic children were significantly sicker and younger, but these factors did not explain the IQ difference.
- Intelligence differences remained even when controlling for sickness severity and age at testing.
Conclusions:
- Intelligence deficits in cyanotic children with CHDs are not solely due to hypoxemia.
- The observed intelligence differences persist even after excluding confounding factors like neurologic abnormalities and prior surgery.
- Further research is needed to understand the underlying mechanisms of cognitive differences in cyanotic children with CHDs.
Abstract:
Previous studies have reported lower intelligence for cyanotic than for acyanotic children with congenital heart disorders, a finding attributed to the degree of hypoxemia present. Several important variables have not been examined consistently, however, including coexisting neurologic or genetic disorders, definitive surgery, degree of sickness, age at testing sex and social class. The present study examined the relation of these variables to obtained intelligence measures for 82 consecutively admitted children, excluding children with abnormal neurologic examinations and those having received definitive surgery. Consistent with earlier reports, intelligence quotients for the acyanotic children (112.81 +/- 14.52 mean +/- SD) were significantly higher (t = 2.60; p = 0.006) than for the cyanotic group (103.50 +/- 15.81). Although sex, race and social class were not significantly different between the 28 cyanotic and the 54 acyanotic children, the cyanotic children were significantly sicker (x2 = 9.12; p = 0.005) and younger (t = 4.10; p = 0.001). However, when young and old children and the degree of sickness within cyanotic and acyanotic groups were compared, no significant differences were found. These findings demonstrate that intelligence differences between cyanotic and acyanotic children persist when the effect of neurologic abnormalities and definitive surgery is removed and remain despite the severity of sickness or child's age at testing.