Full expiratory curves are more difficult to obtain in preschoolers. In addition to height, gender also influences the measures of FVC and FEV1. Reference values were defined for spirometry in preschool children in this population, which are applicable to similar populations.
Objectives: To describe the prevalence of asthma and asthma variants in schoolchildren from Recife in 2002, and to compare these data with data from ; to analyze the relationship between maternal schooling and the presence of asthma or worsening asthma; and to evaluate the diagnostic accuracy of the yearly prevalence of wheezing as an asthma indicator.Methods: Cross-sectional study. A probabilistic sample of 3,086 and 2,774 13-and 14-year-old students answered a written questionnaire in 1994-95 and 2002, as part of the International Study of Asthma and Allergies in Childhood.Results: The following prevalence rates were observed in 1994-95 and 2002, respectively: cumulative prevalence of referred asthma: 21 vs 18.2%; cumulative prevalence of wheezing: 39 vs 38%; yearly prevalence of wheezing: 19.7 vs 19.4%; yearly prevalence of night cough: 31 vs 38%; yearly prevalence of exercise-induced wheezing: 20.6 vs 23.8%. The yearly prevalence of asthma attacks was 16.3 vs 15.2% for 1 to 3 attacks; 2.7 vs 1.2% for 4 to 12 attacks; and 1 vs 0.4% for more than 12 attacks. The yearly prevalence of attacks that disturbed sleep was 13 and 10.3%. The yearly prevalence of attacks with compromised speech was 4.8 and 4.1%. Higher levels of maternal schooling were related to higher cumulative prevalence of referred asthma and to cumulative and yearly prevalence of wheezing. Conclusions:The prevalence of asthma and its severe forms is high in teenager students in Recife. It is also related to higher levels of maternal schooling. IntroductionAsthma is a chronic inflammatory disease of the airways, predominantly eosinophilic, which results in a recurrent obstruction of the airflow, reversible spontaneously or in response to therapy. Atopic disease is the most frequently identified predisposing factor. 1-4 It constitutes a public health problem, as much for its prevalence as for its morbidity. [5][6][7][8][9] During phase one of ISAAC, (International Study of Asthma and Allergies in Childhood), 463,801 13 and 14 year-old adolescents and 257,800 children aged 6 and 7 years of age, from 56 countries were studied by questionnaire. The average cumulative prevalence of asthma reported was 11.3%, varying from 1.4 to 30.4%. Brazil was eighth in the ranking. 5 This project investigated 20,544 schoolchildren aged 13-14 years and 13,604 aged 6-7 years, in Curitiba, Itabira, Recife, Salvador, São Paulo, Porto Alegre and Uberlândia. In the first group, the reported prevalence of asthma was 9.8% for males and 10.2% for females. In the 6-7 year-old group, it was 7.3 and 4.9%, respectively. 6 In Recife, the ISAAC data from 1994-95 for 1,410 schoolchildren aged 6 and 7 years and 3,086 pupils aged 13 and 14 years old, demonstrated a reported asthma prevalence of 20.4 and 19.7%, respectively. 7 Further Brazilian studies using methods similar to those of the ISAAC project have also been performed recently. In schoolchildren from Uberlândia aged 6 and 7 In addition to the point-by-point assessments, the comparison of different periods allows ...
The prevalence of asthma and its severe forms is high in teenager students in Recife. It is also related to higher levels of maternal schooling.
Objective:To determine the cut-off points for FEV1, FEV0.75, FEV0.5, and FEF25-75% bronchodilator responses in healthy preschool children and to generate reference values for FEV0.75. Methods:This was a cross-sectional community-based study involving children 3-5 years of age. Healthy preschool children were selected by a standardized questionnaire. Spirometry was performed before and after bronchodilator use. The cut-off point of the response was defined as the 95th percentile of the change in each parameter. Results:We recruited 266 children, 160 (60%) of whom were able to perform acceptable, reproducible expiratory maneuvers before and after bronchodilator use. The mean age and height were 57.78 ± 7.86 months and 106.56 ± 6.43 cm, respectively. The success rate for FEV0.5 was 35%, 68%, and 70% in the 3-, 4-, and 5-year-olds, respectively. The 95th percentile of the change in the percentage of the predicted value in response to bronchodilator use was 11.6%, 16.0%, 8.5%, and 35.5% for FEV1, FEV0.75, FEV0.5, and FEF25-75%, respectively. Conclusions:Our results provide cut-off points for bronchodilator responsiveness for FEV1, FEV0.75, FEV0.5, and FEF25-75% in healthy preschool children. In addition, we proposed gender-specific reference equations for FEV0.75. Our findings could improve the physiological assessment of respiratory function in preschool children.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.