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Previous issue date: 2013-03-30 === Objective: the aim of this study was to evaluate the lung function in children with Down syndrome by impulse oscillometry technique. Methods: the study was conducted at the Institute of Biomedical Research of the Hospital S?o Lucas, Porto Alegre, from November to February 2012. The study included all children with Down syndrome, from 06 to 18 years old. We excluded children who were under continued use of psychotropic drugs, immunosuppressant s, muscle relaxants or others drugs that may interfere with the results and failure to understand the tests. Results: the study included 14 children, but only 11 were able performs acceptable maneuvers oscillometry. 7 were male; most were Caucasian (71%) and mean age was 06 to 18 years. The mean body mass index was 22. The group presented an increase in resistance and reactance values decreased. Regarding the data pulse oscillation, DS patients had increased the mean resistance over the reference population, since the inductance has lower values compared to the reference group. Conclusion: children with DS showed the present mean values of airway resistance increased and the average reactance decreased when measured by impulse oscillometry. These data characterize the obstructive ventilatory pattern in this population === Objetivo: o objetivo do trabalho foi avaliar as medidas de fun??o pulmonar em crian?as portadoras da S?ndrome de Down por meio da t?cnica de oscilometria de impulso. M?todos: O estudo foi desenvolvido no Instituto de Pesquisas Biom?dicas do Hospital S?o Lucas, em Porto Alegre, no per?odo de novembro de 2011 a fevereiro de 2012. Foram inclu?das no estudo todas as crian?as portadoras de S?ndrome de Down, de 06 a 18 anos de idade. Foram exclu?das do estudo crian?as que estavam sob uso continuado de psicotr?picos, imunossupressores, relaxantes musculares ou outras drogas que possam interferir nos resultados, incapacidade de compreender a realiza??o dos testes. Resultados: Participaram do estudo 14 crian?as, por?m somente 11 conseguiram realizar as manobras aceit?veis de oscilometria. Dentre elas, 7 eram do sexo masculino, a maioria era de origem caucasiana (71%)e a idade m?dia foi de 06 a 18 anos. A m?dia do ?ndice de Massa Corp?rea foi de 22. O grupo apresentou um aumento das resist?ncias e valores diminu?dos de reat?ncia. Em rela??o aos dados de oscilometria de impulso, os pacientes com SD apresentaram as m?dias das resist?ncias aumentadas em rela??o a popula??o de refer?ncia, j? a react?ncia apresenta valores inferiores em compara??o com o grupo de refer?ncia. Conclus?o: As crian?as portadoras de SD do presente estudo apresentaram os valores m?dios das resist?ncias das vias a?reas aumentado e a m?dia da react?ncia diminu?da quando avaliado por meio da oscilometria de impulso. Esses dados caracterizam o padr?o ventilat?rio obstrutivo nesta popula??o
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