title: Maximum FIO2 in minimum time depending on the kind of resuscitation bag and oxygen flow.
abstract: OBJECTIVE
  To analyze what FIO2 can be reached, and how long it takes using the different autoinflated resuscitation bags and increasing oxygen flows.
  
  
  METHODS
  Experimental analysis on the effect of three different models of autoinflated resuscitation bag and increasing oxygen flows in the final FIO2, and time spent to reach it.
  
  
  METHODS
  Laboratory, with a gas analyzer and a lung simulator to measure inspired FIO2.
  
  
  METHODS
  Simulated cardiopulmonary resuscitation. Three different autoinflated resuscitation bags were studied; A, the classic one with oxygen delivery directly into the bag, without reservoir, B, a new one without the reservoir device; and C, a new one with the reservoir device properly implemented. Increasing oxygen flows were administered until FIO2 stabilized.
  
  
  RESULTS
  With model A the maximum FIO2 reached was 0.73 in 70 s using a 20 l/min oxygen flow. With model B the maximum FIO2 reached was 0.65 in 90 s using a 20 l/min oxygen flow. The best FIO2 (0.99) was reached using model C in 55 s with 12 l/min oxygen flow. In the three models a high correlation between oxygen flow and FIO2 was found (r>0.8).
  
  
  CONCLUSIONS
  It is mandatory to use model C resuscitation autoinflated bag with 12 l/min of oxygen flow during the resuscitation maneuvers. Using another autoinflated bag model, maximum oxygen flows (i.e., 20 l/min) are needed. The resuscitation autoinflated bags showed less effectiveness when they were not properly assembled.
authors.affiliation: Intensive Care Unit, Hospital Mútua de Terrassa, Pça Dr. Robert 5, 08221 Terrassa Barcelona, Spain. UCI@mutuaterrassa.es
authors.forename: Salvador
authors.initials: S
authors.lastname: Quintana
authors.forename: Jesús
authors.initials: J
authors.lastname: Martínez Pérez
authors.forename: Manuel
authors.initials: M
authors.lastname: Alvarez
authors.forename: Joan Salvador
authors.initials: JS
authors.lastname: Vila
authors.forename: Fernando
authors.initials: F
authors.lastname: Jara
authors.forename: Juan Manuel
authors.initials: JM
authors.lastname: Nava
mesh_terms: D000704:Analysis of Variance; D015982:Bias; D001944:Breath Tests; D004867:Equipment Design; D006801:Humans; D016014:Linear Models; D008397:Masks / Q000592:standards; D008422:Materials Testing; D010100:Oxygen / Q000032:analysis*; D010102:Oxygen Inhalation Therapy / Q000295:instrumentation / Q000379:methods; D012121:Respiration, Artificial / Q000295:instrumentation / Q000379:methods; D015656:Respiratory Mechanics; D013147:Spirometry; D013990:Tidal Volume; D013997:Time Factors
chemical_list: D010100:Oxygen