title: Impact of cuff pressure on airway leak pressure in laryngeal mask airway supreme and flexible.
abstract: OBJECTIVE
  To investigate the impact of cuff pressure on airway leak pressure in laryngeal mask airway(LMA)Supreme and Flexible.
  
  
  METHODS
  Patients about to have elective breast surgery were divided into Supreme group(35 cases)and Flexible group(33 cases). After general induction of anesthesia,LMA Supreme or Flexible was inserted by one anesthesiologist. We confirmed the LMA location,adjusted the cuff pressure,and recorded the peak airway leak pressures under different cuff pressures(10,20,30,40,and 50 cmH2O).
  
  
  RESULTS
  In Supreme group,peak airway leak pressures [(24.46±5.43),(25.11±5.51),(25.86±5.57),(26.17±5.72)cmH2O] under 20,30,40,and 50 cmH2O cuff pressure showed no significant difference(P>0.05)between each other,but significantly higher than that under 10 cmH2O cuff pressure(20.80±4.63)cmH2O(P<0.05). And in the Flexible group,peak airway leak pressures [(20.09±2.98),(20.70±3.08),(21.21±3.15)cmH2O] under 30,40,50 cmH2O cuff pressure also showed no significant difference(P>0.05)between each other,but significantly higher than those under 10 or 20 cmH2O cuff pressure [(17.52±2.39),(18.61±2.42)cmH2O]. Mean peak airway leak pressure [(25.40±5.52) cmH2O] of LMA Supreme was significantly higher than that of LMA Flexible(20.67±3.06)cmH2O(P<0.05).
  
  
  CONCLUSIONS
  Mean airway leak pressure of LMA Supreme is higher than LMA Flexible. The lowest cuff pressure to meet the tightness requirement with LMA Supreme is 20 cmH2O,which is lower than Flexible(30 cmH2O).
authors.affiliation: Department of Anesthesiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Ya-Hong
authors.initials: YH
authors.lastname: Gong
authors.affiliation: Department of Anesthesiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Si
authors.initials: S
authors.lastname: Chen
authors.affiliation: Department of Anesthesiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China.
authors.forename: Jie
authors.initials: J
authors.lastname: Yi
mesh_terms: D000399:Air Pressure; D000758:Anesthesia / Q000379:methods*; D006801:Humans; D017214:Laryngeal Masks; D008422:Materials Testing