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. 2020 Feb 11;105(5):550–554. doi: 10.1136/archdischild-2019-318073

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Effect of different interfaces and expiratory tubing diameters on mean imposed work of breathing. Resistance to breathing measured as imposed work of breathing (mJ/breath) for inner diameter expiratory tubing of 3–12 mm with three interfaces at 5 cm of submersion with two levels of fresh gas flow. The Fisher & Paykel original expiratory tubing was included to illustrate a commercially available alternative (corrugated tubing, 1.47 m length and approximately 12 mm internal diameter). Details and statistical comparisons are available as supplementary tables.