Rizzetti DA, Quadros JRB, Ribeiro BE, Callegaro L, Veppo AA, Wiggers GA, Peçanha FM. Impact of continuous positive airway pressure on the pulmonary changes promoted by immersion in water.
ACTA ACUST UNITED AC 2018;
43:409-415. [PMID:
29340488 PMCID:
PMC5792039 DOI:
10.1590/s1806-37562017000000088]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 10/15/2017] [Indexed: 11/21/2022]
Abstract
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 cmH2O); and CPAP10 (CPAP at 10 cmH2O). We evaluated HR, SpO2, FVC, FEV1, the FEV1/FVC ratio, peak expiratory flow rate (PEFR), and FEF25-75%) 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.
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