Very long-term follow-up of cognitive function in adults treated in infancy for hydrocephalus.

PURPOSE

The aim was to investigate the very long-term cognitive outcome in adults who had been shunt treated for hydrocephalus during their first year of life.

METHODS

In a population-based series of 72 children born in 1967-1978 and shunt treated for infantile hydrocephalus, 43 were found to have a normal cognitive function when assessed at 6-17 years of age. Twenty-five of them agreed to participate in a follow-up study of cognition at a mean age of 35 years (range, 30-41 years). The Wechsler Adult Intelligence Scale (WAIS-III) was used.

RESULTS

The median full-scale IQ was 101 (range, 83-120), median verbal IQ was 104 (81-115) and performance IQ was 99 (80-127). The corresponding IQs in childhood in the 16 subjects who had been tested previously with the WISC were 101 (84-124), 108 (86-135), and 101 (73-124). Specific cognitive deficits were found for working memory and processing speed. Shunt complications did not affect IQ.

CONCLUSION

This very long-term follow-up study of normally gifted children with hydrocephalus revealed that, as adults, they still had preserved cognitive functions despite recurrent shunt dysfunction. The results are encouraging and represent a tribute to neurosurgical intervention. Continued follow-up studies are needed since the etiological panorama and treatment procedures of children with hydrocephalus are changing over time.