between october 1970 and november 1984 , 26 infants and children aged 11 days to 18 years ( mean 5.7 years ) received 42 permanent cardiac pacemakers ( 26 primary implants , 16 re-implants ) for congenital or surgically acquired heart block , bradycardia and sinus node dysfunction .
C0021270
infants
C0008059
children