J Korean Soc Emerg Med.  2017 Feb;28(1):17-25. 10.0000/jksem.2017.28.1.17.

A Single-center, Prospective, Cross-over Study to Compare the Efficiency of Oxygen Supply between the OxyMaskâ„¢ and Non-rebreather Mask in Healthy Adults

  • 1Department of Emergency Medicine, Soonchunhyang University College of Medicine, Cheonan, Korea. emracoon@gmail.com
  • 2Department of Pediatrics, Soonchunhyang University College of Medicine, Cheonan, Korea.
  • 3Biostatistical Consulting Unit, Soonchunhyang University College of Medicine, Bucheon, Korea.


In this single-center, prospective, randomized, cross-over study, we compared the efficiency of oxygen supply between OxyMask and non-rebreather mask (NRM), depending on the position of the mask.
Either OxyMask or NRM was applied to 33 healthy volunteers, in a random manner, on the upper (that 1 cm upper to it), lower (that 1 cm inferior to it) and lateral malposition (that 1 cm lateral to it). After a 3-minute oxygenation, at a flow rate of 15 L/min, we measured the fractional expired oxygen concentration (F(E)Oâ‚‚), fractional expired carbon dioxide concentration (F(E)COâ‚‚), and visual analogue scale (VAS) scores for the degree-of-wearing sensation.
OxyMask showed a lower level of F(E)Oâ‚‚ as compared with NRM in all positions. Moreover, OxyMask showed no significant difference between F(E)Oâ‚‚ and the position of the mask. However, NRM showed a significantly lower F(E)Oâ‚‚ in the upper and lateral malposition. F(E)COâ‚‚ had no significant difference with the types and position of the mask. The mean VAS scores for the degree-of-wearing sensation were 2.2±1.5 in the OxyMask and 4.3±1.5 in the NRM (p<0.001).
OxyMask may offer greater benefit in maintaining the concentration of supplied oxygen and provide greater comfort than NRM in patients with difficulty applying the mask on an adequate location and maintaining the seal.


Oxygenation; Carbon dioxide; Mask; Visual analogue scale
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