[Effect of timing of surgery on the intellectual and psychosocial development of children with tetralogy of Fallot].

Chronic hypoxemia in patients with Tetralogy of Fallot may influence intellectual and social development. Even though the physical situation is the most important factor for the time of operation, psychosocial aspects should be considered as well. 24 children underwent intelligence tests and questionnaires, 13 of them having had surgery in early infancy, 11 between 7 and 11 years of age. No significant difference was noted between the two groups concerning early childhood development and mean IQ. Early operation does appear to improve the social situation. Such children are able to participate in kindergarten, start school in time and pass through school without delay. These results suggest a possible beneficial relief of the stressed situation of the whole family.