The Science Journal of the American Association for Respiratory Care

2004 OPEN FORUM Abstracts

Pharyngeal oxygen concentrations in normal subjects wearing the hiox80® mask

Richard B. Wettstein, BS, RRT; Jay I. Peters, MD; David C. Shelledy, PhD, RRT; The University of Texas Health Science Center at San Antonio, San Antonio, Texas.

Introduction: The non-rebreather mask (NRB) is a commonly used oxygen delivery device for delivering high oxygen concentrations (OC) (55-70%)1. Recently the HiOx80® (VIASYS Healthcare Inc.
Conshohocken, PA) was introduced. The manufacture states the Hi-Ox80 is “the only commercially available disposable oxygen mask capable of delivering >80% oxygen at only 8 liters per minute of oxygen flow.”2 We wished to verify this by measuring the pharyngeal oxygen concentration on human subjects.

Methods:
Ten healthy subjects were used in the study. Prior to oxygen administration a pharyngeal catheter was placed with the tip resting behind the uvula. Oxygen was then administered at flows of 8, 10, 12, and 15 L/min via the HiOx80 mask. While breathing at a resting level three samples were drawn from the pharynx and analyzed.

Results
: The mean OC and standard deviation are shown below:

Liter flow Mean OC Standard Deviation
8 65.6% 11.9%
10 69.8% 9.9%
12 73.8% 8.5%
15 76.1% 10.7%

The mask was capable of delivering OC in excess of 80%, as on all liter flow settings the upper portion of the range surpassed 80%. However on all liter flow settings the mean was less than 80%. In addition the lower end of the range dipped as low as 33% on the 8 L/min.

Conclusion: When a moderate to high OC is desired the HiOx80 is an alternative that supplies similar OC to the NRB mask.

1. Heuer AJ, Scanlan CL. Medical gas therapy. In: Egan’s fundamentals of respiratory care, 8th ed. St Louis: Mosby; 2003:834

2. http://www.viasyshealthcare.com/prod_serv/prodDetail.aspx?config= ps_prodDtl&prodID=149

Departmental Funding

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