2004 OPEN FORUM Abstracts
Pharyngeal oxygen concentrations in normal subjects wearing the hiox80® mask
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|
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