to gain further insight into the possible role of endogenous opioid peptides in the respiratory difficulties associated with the apnea of infancy and other disorders possibly related to apnea , the levels of beta-endorphin immunoreactivity were measured in the cerebrospinal fluid ( csf ) of five groups of infants : ( 1 ) infants with proved apnea , ( 2 ) infants with histories of an apparent life-threatening event ( alte ) , ( 3 ) siblings of victims of the sudden infant death syndrome ( sids ) , ( 4 ) infants with suspected but unproved apnea , and ( 5 ) infants undergoing investigation for other acute illnesses .
C0012634
disorders
C0039082
syndrome