In a consecutive series of spina bifida operated unselectively at birth 62% reached the twelfth birthday and 54% could be expected to reach the nineteenth. Many of the most severely affected cases survived; if they died the cause was usually renal failure. Bronchopneumonia was the main cause of death in infants and hydrocephalus in the older children. Girls outnumbered boys by 1:1.3 and, although they were more severely affected, their survival equalled the boys'. Awareness of the high survival rate which results from the treatment of spina bifida is important for the parents of a newborn baby. It is also a prerequisite in planning provision for the young adult.
Two hundred and fourteen cases of spinal dysraphism were studied to investigate the relationship of sensory level and renal damage. It was found that in 72 cases with a high sensory level of T12 and above, 45 cases (62%) had renal damage which was the cause of death in 12; in 142 cases with a low sensory level of L1 and below, 40 cases (28%) had renal damage which was the cause of death in only 2. A palpable bladder and reflux were associated with renal damage in the cases with a low sensory level but some additional factor appears to operate in those with a high sensory level. Other reasons for the poor prognosis in these cases are discussed. The critical level in the spinal cord at which the prognosis for renal damage sharply changes coincides with the sympathetic outflow to the renal tract (T12-L1). Disruption of the spinal cord at or above the renal outflow may be a determining factor in prognosis.
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