Habituation responses to external stimuli: is the habituation of preterm infants at a postconceptual age of 40 weeks equal to that of term infants?

Habituation responses to external stimuli: is the habituation of preterm infants at a postconceptual age of 40 weeks equal to that of term infants?

Author Castillo, Mariana Ulhoa Autor UNIFESP Google Scholar
Moraes Barros, Marina Carvalho de Autor UNIFESP Google Scholar
Guinsburg, Ruth Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract Objective Compare the habituation responses to external stimuli between preterm infants at the postconceptual age of 40 weeks and term infants in the first days of life, and evaluate the habituation responses of the preterm infants until the age of 40 postconceptual weeks.Methods Prospective cohort study of preterm infants aged <32 weeks. the habituation responses to light, rattle, bell and tactile stimuli of preterm infants were assessed at 32, 34, 36 and 3840 postconceptual weeks. External stimuli were presented and responses were scored according to Lester and Tronik (2004). Habituation scores were compared between preterm and term infants, matched by sex, using t test. Repeated measures ANOVA was used to compare the responses between the different postconceptual gestational ages. Contrast models were used to verify the differences between the habituation responses according to the type of stimulus and the postconceptual ages.Results 51 preterm infants were studied (gestational age 29.4 +/- 2.4w; birth weight 1230 +/- 323 g). the scores for the habituation responses to the four stimuli progressively increased with advancing postconceptual age. At the age of 40 postconceptual weeks, the preterm infants were habituated to external stimuli similarly to the 51 studied term infants. the preterm infants showed higher habituation response scores for the rattle and bell stimuli than for the light and tactile stimuli.Conclusions Preterm infants improve their habituation responses to external stimuli as their postconceptual age increases, and, at 40 weeks of corrected age, they have similar responses to those exhibited by fullterm infants in the first days of life.
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number FAPESP: 2011/18171-0
Date 2014-09-01
Published in Archives of Disease in Childhood-fetal and Neonatal Edition. London: Bmj Publishing Group, v. 99, n. 5, p. F402-F407, 2014.
ISSN 1359-2998 (Sherpa/Romeo, impact factor)
Publisher Bmj Publishing Group
Extent F402-F407
Origin http://dx.doi.org/10.1136/archdischild-2013-305626
Access rights Closed access
Type Article
Web of Science ID WOS:000340781200011
URI http://repositorio.unifesp.br/handle/11600/38198

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