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. 2015 Sep 15;4(4):e28944. doi: 10.5812/cardiovascmed.28944

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Copyright © 2015, Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences.

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

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Figure 1. — MEP, maximal expiratory pressure; MIP, maximal inspiratory pressure; BNP, brain natriuretic peptide; TV/RR slope, slope relating tidal volume to respiratory rate; VE/VCO₂ slope, slope relating minute ventilation to carbon dioxide production.