title: Comparison of different airway management strategies to ventilate apneic, nonpreoxygenated patients.
abstract: OBJECTIVE
  Endotracheal intubation is the gold standard for providing emergency ventilation, but acquiring and maintaining intubation skills may be difficult. Recent reports indicate that even in urban emergency medical services with a high call volume, esophageal intubations were observed, requiring either perfect intubation skills or development of alternatives for emergency ventilation.
  
  
  METHODS
  Simulated emergency ventilation in apneic patients employing four different airway devices that used small tidal volumes.
  
  
  METHODS
  University hospital operating room.
  
  
  METHODS
  Forty-eight ASA I/II patients who signed written informed consent before being enrolled into the study.
  
  
  METHODS
  In healthy adult patients without underlying respiratory or cardiac disease who were breathing room air before undergoing routine induction of surgery, 12 experienced professional paramedics inserted either a laryngeal mask airway (n = 12), Combitube (n = 12), or cuffed oropharyngeal airway (n = 12) or placed a face mask (n = 12) before providing ventilation with a pediatric (maximum volume, 700 mL) self-inflating bag with 100% oxygen for 3 mins.
  
  
  RESULTS
  In three of 12 cuffed oropharyngeal airway patients, two of 12 laryngeal mask airway patients, and one of 12 Combitube patients, oxygen saturation fell below 90% during airway device insertion, and the experiment was terminated; no oxygenation failures occurred with the bag-valve-mask. Oxygen saturation decreased significantly (p <.05) during insertion of the Combitube and laryngeal mask but not with the bag-valve-mask and cuffed oropharyngeal airway; however, oxygen saturation increased after 1 min of ventilation with 100% oxygen. No differences in tidal lung volumes were observed between airway devices.
  
  
  CONCLUSIONS
  Paramedics were able to employ the laryngeal mask airway, Combitube, and cuffed oropharyngeal airway in apneic patients with normal lung compliance and airways. In this population, bag-valve-mask ventilation was the most simple and successful strategy. Small tidal volumes applied with a pediatric self-inflating bag and 100% oxygen resulted in adequate oxygenation and ventilation.
authors.affiliation: Department of Anaesthesiology and Intensive Care Medicine, University Hospital of Kiel, Germany.
authors.forename: Volker
authors.initials: V
authors.lastname: Dörges
authors.forename: Volker
authors.initials: V
authors.lastname: Wenzel
authors.forename: Peer
authors.initials: P
authors.lastname: Knacke
authors.forename: Klaus
authors.initials: K
authors.lastname: Gerlach
mesh_terms: D000328:Adult; D001049:Apnea / Q000097:blood / Q000628:therapy*; D001784:Blood Gas Analysis; D004632:Emergency Medical Services / Q000379:methods; D004867:Equipment Design; D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal / Q000295:instrumentation* / Q000379:methods*; D017214:Laryngeal Masks / Q000592:standards*; D008170:Lung Compliance; D008297:Male; D010100:Oxygen / Q000097:blood; D010102:Oxygen Inhalation Therapy / Q000295:instrumentation / Q000379:methods; D012121:Respiration, Artificial / Q000295:instrumentation* / Q000379:methods*; D013990:Tidal Volume; D016896:Treatment Outcome
chemical_list: D010100:Oxygen