Preoxygenation by 8 deep breaths in 60 seconds using the Mapleson A (Magill), the circle system, or the Mapleson D system.
OBJECTIVE
To investigate the efficacy of preoxygenation by eight deep breaths in 60 seconds with the Mapleson A (Magill) system, the circle anesthesia system, or the Mapleson D system at an oxygen flow of 5 L/min or 10 L/min.


METHODS
Randomized, clinical study.


METHODS
Operating room of a university hospital.


METHODS
10 healthy volunteers.


METHODS
Volunteers underwent 6 preoxygenation trials consisting of 8 deep breaths in 60 seconds using the Mapleson A, Mapleson D, and the circle anesthesia systems at an oxygen flow of 5 L/min and 10 L/min.


METHODS
Fractional end-tidal oxygen concentration (F(ET)O(2)) was measured at 15-second intervals during preoxygenation.


RESULTS
At an oxygen flow of 10 L/min, mean F(ET)O(2) values at 60 seconds of preoxygenation were comparable among the Mapleson A, Mapleson D, and the circle anesthesia systems (87 +/- 2.1%, 87 +/- 1.6%, 87 +/- 1.6%, respectively). Using an oxygen flow of 5 L/min, mean F(ET)O(2) values at 60 seconds were similar among the Mapleson A, Mapleson D, and circle anesthesia systems (74 +/- 4.1%, 75 +/- 2.6%, 74 +/- 4.4%, respectively); however, they were significantly lower than the corresponding values achieved at an oxygen flow of 10 L/min.


CONCLUSIONS
The 8-deep-breaths in 60 seconds technique at an oxygen flow of 10 L/min can achieve adequate preoxygenation with the Mapleson A (Magill), Mapleson D, and circle anesthesia systems. Suboptimal preoxygenation is obtained with the three systems when the oxygen flow used is 5 L/min.
Taha
Samar K
SK
Department of Anesthesiology, American University of Beirut Medical Center, Beirut, Lebanon.
El-Khatib
Mohamad F
MF
Siddik-Sayyid
Sahar M
SM
Abdallah
Faraj W
FW
Dagher
Carla M
CM
Chehade
Jules-Marie A
JM
Baraka
Anis S
AS
D000328:Adult; D000764:Anesthesia, Closed-Circuit; D004867:Equipment Design; D005260:Female; D006801:Humans; D001239:Inhalation / Q000502:physiology*; D008297:Male; D010100:Oxygen / Q000008:administration & dosage* / Q000032:analysis; D011229:Preanesthetic Medication / Q000295:instrumentation* / Q000379:methods; D013990:Tidal Volume / Q000502:physiology; D013997:Time Factors; D016896:Treatment Outcome
D010100:Oxygen