Objective: To determine epidemiological changes in recurrent wheezing among infants in Curitiba, Brazil. Results: Parents of 3,003 infants participated in phase I, and 22.6% of the infants had recurrent wheezing (≥ 3 episodes). After 5 years, 1,003 parents completed the same questionnaire during phase III, and 19.8% of the infants had recurrent wheezing (p = 0.1). There was a reduction in symptom severity (p = 0.001) and number of emergency department visits (p < 0.001), but not in number of hospitalizations (p = 0.12). Physician-diagnosed asthma was more frequent in phase III (p = 0.03). Conclusions:There were no changes in the prevalence of recurrent wheezing in infants, but there was an increase in physician-diagnosed asthma and a reduction in severity, which, however, did not affect the rate of hospitalizations.J Pediatr (Rio J). 2011;87(6):547-50: Asthma, infant, prevalence, wheezing. ResumoObjetivo: Verificar mudanças na epidemiologia da sibilância recorrente em lactentes de Curitiba (PR). Método: Estudo transversal com aplicação do questionário Estudio Conclusões:Não houve mudança na prevalência de sibilância recorrente em lactentes, mas ocorreu redução na gravidade, embora sem afetar o nível de internações e com aumento do diagnóstico de asma pelos clínicos.J Pediatr (Rio J). 2011;87(6):547-50: Asma, criança, prevalência, sibilo. Recurrent wheezing in infants: epidemiological changes IntroduçãoA prevalência de doenças alérgicas na população pediá-trica vem sendo amplamente estudada nos últimos anos. Na comparação das fases I e III do International Study of Asthma and Allergies in Childhood (ISAAC), realizada com intervalo de pelo menos 5 anos entre as fases, houve aumento na prevalência de asma em escolares e adolescentes na maioria dos centros participantes 1 . Apesar de o Brasil apresentar altas prevalências de asma e de sintomas relacionados, na fase III do ISAAC, a maioria dos centros evidenciou redução desses índices, tanto em escolares quanto nos adolescentes, e os ní-1. Pós-doutorando, Saúde da Criança e do Adolescente, Universidade Federal do Paraná (UFPR), Curitiba, PR. Pesquisador associado, Serviço
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