Abstract
Are familial factors a determinant of the risk of sudden death in infants? An article in this issue of the Journal by Schiffman and his co-workers suggests that in some cases the answer is yes. This important study showed that parents of victims of the sudden-infant-death syndrome (SIDS) had reduced ventilatory responsiveness to hypercapnia and reduced compensatory response to added resistive respiratory loads as compared with parents of normal infants. These findings add to the growing evidence that familial and perhaps genetic factors may be important in determining breathing and sometimes survival in infants and adults.Despite numerous theories, no . . .

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