Espirometria em pré-escolares asmáticos: um estudo de vida real

Abstract

Background: Spirometry in preschool age is emerging as an important tool for the study of lung diseases. Different predicted value equations in various regions of the world were described in the past decade. In Brazil, study of Burity et al suggested reference values for the Brazilian population. Objective: Collect spirometric data of Brazilian preschool children with asthma and compare their values between a Brazilian and an international equation. Verify the change in forced expiratory volume in half a second (FEV0,5) and forced expiratory volume in 1 second (FEV1) after the bronchodilator test. Methods: Data of all asthmatic preschool children who were referred to the pulmonary function laboratory of the Hospital das Clínicas, Federal University of Minas Gerais, Brazil, in the period between 2009 and 2013 were collected. The predicted values of the equations of Burity et al and Nystad et al were compared. Observe the variation of the FEV0,5 and FEV1 after the bronchodilator test. Results: Of 64 patients, 41 were able to perform the test (64 % success rate). Comparing the predicted values between the two equations used, there was no statistical significance in any age group. A total of 11 patients had variation of the FEV0,5 above 12 % compared to 4 patients considering FEV1 (p < 0.05). Conclusion: Most children could perform the test. The predicted values for this study were similar comparing them with the Brazilian and the international equation. Further studies to understand the role of bronchodilator test in preschool children are still needed.