The Effects of Flow on Airway Pressure During Nasal High-Flow Oxygen Therapy

Authors: Parke, Rachael L; Eccleston, Michelle L; McGuinness, Shay P

Source: Respiratory Care, Volume 56, Number 8, August 2011 , pp. 1151-1155(5)

Publisher: The Journal Respiratory Care Company

Buy & download fulltext article:

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.


BACKGROUND: Nasal high-flow oxygen therapy increases the mean nasopharyngeal airway pressure in adults, but the relationship between flow and pressure is not well defined. OBJECTIVE: To determine the relationship between flow and pressure with the Optiflow nasal high-flow oxygen therapy system. METHODS: We invited patients scheduled for elective cardiac surgery to participate. Measurements were performed with nasal high-flow oxygen at flows of 30, 40, and 50 L/min, with the patient's mouth both open and closed. Pressures were recorded over one minute of breathing, and average flows were calculated via simple averaging. RESULTS: With the mouth closed, the mean ± SD airway pressures at 30, 40, and 50 L/min were 1.93 ± 1.25 cm H2O, 2.58 ± 1.54 cm H2O, and 3.31 ± 1.05 cm H2O, respectively. There was a positive linear relationship between flow and pressure. CONCLUSIONS: The mean nasopharyngeal pressure during nasal high-flow oxygen increases as flow increases. Australian Clinical Trials Registry

Keywords: airway pressure; nasal high-flow therapy; oxygen therapy

Document Type: Research Article


Affiliations: Cardiothoracic and Vascular ICU, Auckland City Hospital, Auckland, New Zealand

Publication date: August 1, 2011

More about this publication?
Related content



Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content

Text size:

A | A | A | A
Share this item with others: These icons link to social bookmarking sites where readers can share and discover new web pages. print icon Print this page