The NuMask® is as Effective as the Face Mask in Achieving Maximal Preoxygentation.
Middle East journal of anaesthesiology(2016)
Abstract
Background: Preoxygenation before anesthetic induction is a widely accepted maneuver to
increase oxygen reserves and delay desaturation during apnea. There is limited data regarding the
use of the NuMask® in the perioperative setting, and no data as to its efficacy in achieving maximal
preoxygenation. We hypothesize that the NuMask® may be a useful alternative to the face mask in
achieving maximal preoxygenation.
Methods: After IRB approval, the NuMask® was compared with the classic face mask
with respect to achieving maximal pre-oxygenation in 30 healthy volunteers using tidal volume
breathing. All volunteers were tested for three periods of 5 minutes intervals and the following
parameters were recorded every 30 seconds: inspired, and end-tidal oxygen concentration and endtidal
carbon dioxide concentration.
Results: The mean ETO2 of ≥90% was achieved with both masks at 3.5 minutes (SD =
1.62 and 1.98 for facemask and NuMask® respectively) and thereafter the ETO2 remained above
90%. There were no statistical differences noted in FiO2 and ETO2 between the face mask and the
NuMask® in the same time periods. ETCO2 values were also not statistically different between the
two masks.
Conclusions: The study showed that the NuMask® is as effective as the classic face mask in
achieving maximal pre-oxygenation during tidal volume breathing.
Introduction
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Key words
face numask®,achieving maximal preoxygentation
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