title: Preoxygenation by 8 deep breaths in 60 seconds using the Mapleson A (Magill), the circle system, or the Mapleson D system.
abstract: 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.
authors.affiliation: Department of Anesthesiology, American University of Beirut Medical Center, Beirut, Lebanon.
authors.forename: Samar K
authors.initials: SK
authors.lastname: Taha
authors.forename: Mohamad F
authors.initials: MF
authors.lastname: El-Khatib
authors.forename: Sahar M
authors.initials: SM
authors.lastname: Siddik-Sayyid
authors.forename: Faraj W
authors.initials: FW
authors.lastname: Abdallah
authors.forename: Carla M
authors.initials: CM
authors.lastname: Dagher
authors.forename: Jules-Marie A
authors.initials: JM
authors.lastname: Chehade
authors.forename: Anis S
authors.initials: AS
authors.lastname: Baraka
mesh_terms: 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
chemical_list: D010100:Oxygen