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Impact of continuous positive airway pressure on the pulmonary changes promoted by immersion in water

OBJECTIVE: To determine whether different levels of CPAP improve the lung volumes and capacities of healthy subjects immersed in water. METHODS: This was a randomized clinical trial, conducted between April and June of 2016, involving healthy female volunteers who were using oral contraceptives. Thr...

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Detalles Bibliográficos
Autores principales: Rizzetti, Danize Aparecida, Quadros, Janayna Rodembuch Borba, Ribeiro, Bruna Esmerio, Callegaro, Letícia, Veppo, Aline Arebalo, Wiggers, Giulia Alessandra, Peçanha, Franck Maciel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Sociedade Brasileira de Pneumologia e Tisiologia 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5792039/
https://www.ncbi.nlm.nih.gov/pubmed/29340488
http://dx.doi.org/10.1590/S1806-37562017000000088
Descripción
Sumario:OBJECTIVE: To determine whether different levels of CPAP improve the lung volumes and capacities of healthy subjects immersed in water. METHODS: This was a randomized clinical trial, conducted between April and June of 2016, involving healthy female volunteers who were using oral contraceptives. Three 20-min immersion protocols were applied: control (no CPAP); CPAP5 (CPAP at 5 cmH(2)O); and CPAP10 (CPAP at 10 cmH(2)O). We evaluated HR, SpO(2), FVC, FEV(1), the FEV(1)/FVC ratio, peak expiratory flow rate (PEFR), and FEF(25-75%)) at three time points: pre-immersion; 10 min after immersion; and 10 min after the end of each protocol. RESULTS: We evaluated 13 healthy volunteers. The CPAP10 protocol reversed the restrictive pattern of lung function induced by immersion in water, maintaining pulmonary volumes and capacities for a longer period than did the CPAP5 protocol. CONCLUSIONS: When the hemodynamic change causing a persistent lung disorder, only the application of higher positive pressures is effective in maintaining long-term improvements in the pulmonary profile.