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Feasibility and reproducibility of spirometry and inductance plethysmography in healthy Brazilian preschoolers

2012; Wiley; Volume: 48; Issue: 7 Linguagem: Inglês

10.1002/ppul.22743

8755-6863

Danielle Corrêa França, Paulo Augusto Moreira Camargos, Jocimar Avelar Martins, Mercês C.S. Abreu, Gilda Helena Avelar e Araújo, Verônica Franco Parreira,

Respiratory Support and Mechanisms

Abstract Rationale Preschoolers show peculiarities that reinforce the importance of assessing their pulmonary function. However, there are few data on the success rate and between‐occasions reproducibility of pulmonary function tests in preschoolers, particularly in the Brazilian population. Objective To assess the success rate and between‐occasions reproducibility of the variables obtained by spirometry and respiratory inductive plethysmography in healthy children aged 4–6 years. Methods Breathing pattern was assessed by plethysmography (tidal volume‐V T , respiratory rate‐f, inspiratory duty cycle‐Ti/Ttot, mean respiratory flow‐V T /Ti, displacement of the rib cage‐RC and phase relation during the total breath‐PhRTB) and spirometry (forced vital capacity‐FVC, forced expiratory volume in 0.5 sec‐FEV 0.5 and forced expiratory volume in first second‐FEV 1 ) in 47 healthy children, aged 4–6 years. To evaluate between‐occasions reproducibility, 10 children (according to the sample size calculation) were reassessed after 3 weeks. Between‐occasions reproducibility was evaluated by paired t ‐test, considering significant P < 0.05, Intraclass Correlation Coefficient (ICC) and coefficient of variation of method error (CV ME ). Results The results showed an 83% success rate for spirometry and a 98% success rate for plethysmography. Regarding reproducibility, there were no significant differences between the variables of any test. Spirometry ICC was above 0.80 and the CV ME was lower than 10%. The plethysmography ICC was between 0.61 and 0.95, and the CV ME was between 2% and 31%. Conclusions These results suggest a high success rate in performing the pulmonary function tests and good between‐occasions reproducibility for spirometry and plethysmography in healthy preschoolers. Pediatr Pulmonol. 2013; 48:716–724. © 2012 Wiley Periodicals, Inc.