title: Major surgery within the first 3 months of life and subsequent biobehavioral pain responses to immunization at later age: a case comparison study.
abstract: OBJECTIVE
  Pain exposure during early infancy affects the pain perception beyond infancy into childhood. The objective of this study was to examine whether major surgery within the first 3 months of life in combination with preemptive analgesia alters pain responses to immunization at 14 or 45 months and to assess whether these alterations are greater in toddlers with a larger number of negative hospital experiences.
  
  
  METHODS
  Two groups of 50 toddlers each were compared: index group and control group. All index toddlers had participated within the first 3 months of their life in a randomized, clinical trial that evaluated the efficacy of preemptive morphine administration for postoperative analgesia. The controls were matched by type of immunization and community health care pediatrician. Pain reactions were recorded at routine immunization at either 14 (measles-mumps-rubella immunization) or 45 months (diphtheria-tetanus-trivalent polio immunization) of age. Outcome measures were facial reaction, coded by the Maximum Discriminative Facial Movement Coding System; heart rate (HR); and cortisol saliva concentration. Negative hospital experiences included number of operations requiring postoperative morphine administration, cumulative Therapeutic Intervention Scoring System scores, and length of stay in the intensive care unit or total hospitalization days.
  
  
  RESULTS
  No differences were found between the index and control groups in the facial display of pain, anger, or sadness or in physiologic parameters such as HR and cortisol concentrations. Intragroup analyses of the index group showed that after measles-mumps-rubella vaccination, the number of negative hospital experiences correlated positively with the facial responsiveness and negatively with HR responses. No effect was seen after diphtheria-tetanus-trivalent polio immunization.
  
  
  CONCLUSIONS
  Major surgery in combination with preemptive analgesia within the first months of life does not alter pain response to subsequent pain exposure in childhood. Greater exposure to early hospitalization influences the pain responses after prolonged time. These responses, however, diminish after a prolonged period of nonexposure.
authors.affiliation: Department of Pediatric Surgery, Erasmus MC-Sophia, Rotterdam, The Netherlands. peters@anes.azr.nl
authors.forename: Jeroen W B
authors.initials: JW
authors.lastname: Peters
authors.forename: Hans M
authors.initials: HM
authors.lastname: Koot
authors.forename: Josien B
authors.initials: JB
authors.lastname: de Boer
authors.forename: Jan
authors.initials: J
authors.lastname: Passchier
authors.forename: Jolien M
authors.initials: JM
authors.lastname: Bueno-de-Mesquita
authors.forename: Frank H
authors.initials: FH
authors.lastname: de Jong
authors.forename: Hugo J
authors.initials: HJ
authors.lastname: Duivenvoorden
authors.forename: Dick
authors.initials: D
authors.lastname: Tibboel
mesh_terms: D000367:Age Factors; D016022:Case-Control Studies; D006801:Humans; D007114:Immunization / Q000009:adverse effects / Q000523:psychology*; D007223:Infant; D007231:Infant, Newborn; D007902:Length of Stay / Q000706:statistics & numerical data; D009020:Morphine / Q000008:administration & dosage; D015588:Observer Variation; D010146:Pain / Q000188:drug therapy* / Q000209:etiology / Q000523:psychology*; D010147:Pain Measurement; D010149:Postoperative Pain / Q000188:drug therapy / Q000523:psychology; D011446:Prospective Studies; D013514:Surgical Procedures, Operative / Q000523:psychology*; D019616:Thoracic Surgical Procedures / Q000523:psychology
chemical_list: D009020:Morphine