title: Resuscitation of newborn infants with 21% or 100% oxygen: follow-up at 18 to 24 months.
abstract: OBJECTIVE
  To follow-up children who had been resuscitated at birth with either 21% or 100% oxygen (O2).
  
  
  METHODS
  A multicenter study with 10 participating centers recruited 609 infants to the Resair 2 study where resuscitation was performed with either 21% or 100% O2. A follow-up between ages 18 and 24 months was performed. However, during follow-up registration, it was found that 18 infants had been enrolled twice in the original Resair 2 study with different registration numbers, leaving 591 enrolled in the Resair 2 study and 410 enrolled in the 7 centers participating in the follow-up. Of these 410 infants, 79 died (76 in the neonatal and 3 in the postneonatal period). Furthermore, for 8 infants informed consent was not obtained, leaving 323 eligible for follow-up. Of these, 213 infants (66%) were followed-up: 91 (62%) had been resuscitated with 21% O2, and 122 (69%) with 100% O2. At a median age of 22 and 20 months (not significant) in the 21% and 100% groups, respectively, a simple questionnaire was filled out and neurologic assessment was performed in addition to measuring anthropometric data.
  
  
  RESULTS
  There were no significant differences in weight, height, or head circumference between the 2 groups. Cerebral palsy developed in 10% and 7%, respectively, in the 2 groups (not significant). In total, 11 cases (12%) in the 21% versus 11 cases (9%) in the 100% O(2) group (odds ratio: 1.39, 95% confidence interval: 0.57-3.36) developed cerebral palsy and/or mental or other delay. Furthermore, it was concluded that 14 (15%) in the 21% group and 12 (10%) in the 100% group were not normal (odds ratio: 1.67, 95% confidence interval: 0.73-3.80).
  
  
  CONCLUSIONS
  There were no significant differences in somatic growth or neurologic handicap at an age of 18 to 24 months in infants resuscitated with either 21% or 100% O2 at birth. Based on these data, resuscitation with ambient air seems to be safe, at least in most cases. More studies are needed to settle this issue.
authors.affiliation: Department of Pediatric Research, Rikshospitalet, University of Oslo, Oslo, Norway. o.d.saugstad@klinmed.uio.no
authors.forename: Ola D
authors.initials: OD
authors.lastname: Saugstad
authors.forename: Siddarth
authors.initials: S
authors.lastname: Ramji
authors.forename: Simin F
authors.initials: SF
authors.lastname: Irani
authors.forename: Safaa
authors.initials: S
authors.lastname: El-Meneza
authors.forename: Emil A
authors.initials: EA
authors.lastname: Hernandez
authors.forename: Maximo
authors.initials: M
authors.lastname: Vento
authors.forename: Tiina
authors.initials: T
authors.lastname: Talvik
authors.forename: Rønnaug
authors.initials: R
authors.lastname: Solberg
authors.forename: Terje
authors.initials: T
authors.lastname: Rootwelt
authors.forename: Odd O
authors.initials: OO
authors.lastname: Aalen
mesh_terms: D001724:Birth Weight; D002658:Developmental Disabilities; D005260:Female; D005500:Follow-Up Studies; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn / Q000254:growth & development; D008297:Male; D010102:Oxygen Inhalation Therapy / Q000379:methods*; D012151:Resuscitation / Q000379:methods*; D011795:Surveys and Questionnaires