Impulse oscillometry and whole-body plethysmography parameters are correlated in healthy children: a cross-sectional study
Tayná Castilho, Renata Maba Gonçalves Wamosy, Fabiula Joanita da Mata Belém, Tatiana Godoy Bobbio, Camila Isabel Santos Schivinski
Resumo
Background: The whole-body plethysmography (WBP) is the gold standard for verifying pulmonary function, assessing the airway resistance and the pulmonary volume and capacities through a forced expiratory maneuver. In turn, the airway resistance assessment can be performed through the impulse oscillometry system (IOS) during tidal breathing. The question therefore arises as to whether these evaluations have any correlation. Aim: The main objective is to investigate the correlation between the WBP and IOS variables in healthy children. The secondary objective is to investigate the correlation between WBP resistance parameters and lung volumes and capacity parameters. Methods: Cross-sectional analytical study including healthy children between seven to 14 years old from private and public schools in Brazil. The children’s respiratory system was evaluated through IOS and WBP, and the following parameters were registered: By IOS, impedance at 5 Hz (Z5), total airway resistance, central airway resistance, and reactance at 5 Hz; By WBP, airway resistance (Raw), specific airway resistance (sRaw), total airway resistance, inspiratory capacity, expiratory reserve volume, plethysmography functional residual capacity, vital capacity, residual volume (RV), total lung capacity, forced vital capacity, forced expiratory volume in one second (FEV1), and forced expiratory flow of 25% to 75% of forced vital capacity. Pearson and Spearman’s Correlation Coefficients (r and rs , respectively) were used to investigate the correlations between IOS and WBP parameters. Results: Sixty-one children with an average age of 9.57±2.06 years, 54% female individuals, participated in this study. There were significant correlations between IOS and most WBP parameters (r/rs =0.256-0.702, p≤0.05 for all, except for sRaw and RV). In turn, the oscillometry parameter Z5 showed the strongest correlation with a WBP parameter (r=-0.702 with FEV1). Moreover, Raw presented a correlation to other WBP parameters (r/rs ≥0.330). Conclusion: IOS parameters showed weak-to-moderate correlations with most WBP parameters in healthy children.
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Referências
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Aceito em:
22/03/2024
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