title: Comparison of 2 cuff inflation methods of laryngeal mask airway Classic for safe use without cuff manometer in adults.
abstract: OBJECTIVE
  This single-center, prospective, randomized, double-blind, 2-arm, parallel group comparison trial was performed to establish whether the adult-sized laryngeal mask airway (LMA) Classic (The Laryngeal Mask Company Ltd, Henley-on-Thames, UK) could be used safely without any consideration of cuff hyperinflation when a cuff of the LMA Classic was inflated using half the maximum inflation volume or the resting volume before insertion of device.
  
  
  METHODS
  Eighty patients aged 20 to 70 years scheduled for general anesthesia using the LMA Classic were included. Before insertion, the cuff was partially filled with half the maximum inflation volume in the half volume group or the resting volume created by opening the pilot balloon valve to equalize with atmospheric pressure in the resting volume group. Several parameters regarding insertion, intracuff pressure, airway leak pressure, and leakage volume/fraction were collected after LMA insertion.
  
  
  RESULTS
  The LMA Classic with a partially inflated cuff was successfully inserted in all enrolled patients. Both groups had the same success rate of 95% at the first insertion attempt. The half volume group had a lower mean intracuff pressure compared with the resting volume group (54.5 ± 16.1 cm H2O vs 61.8 ± 16.1 cm H2O; P = .047). There was no difference in airway leak pressure or leakage volume/fraction between the 2 groups under mechanical ventilation.
  
  
  CONCLUSIONS
  The partially inflated cuff method using half the maximum recommended inflation volume or the resting volume is feasible with the adult-sized LMA Classic, resulting in a high success rate of insertion and adequate range of intracuff pressures.
authors.affiliation: Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul 120-752, Republic of Korea.
authors.forename: Min-Soo
authors.initials: MS
authors.lastname: Kim
authors.affiliation: Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul 120-752, Republic of Korea.
authors.forename: Jeong-Rim
authors.initials: JR
authors.lastname: Lee
authors.affiliation: Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul 120-752, Republic of Korea.
authors.forename: Yang-Sik
authors.initials: YS
authors.lastname: Shin
authors.affiliation: Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, College of Medicine, Soonchunhyang University, Cheonan 330-100, Republic of Korea.
authors.forename: Ji-Won
authors.initials: JW
authors.lastname: Chung
authors.affiliation: Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul 120-752, Republic of Korea.
authors.forename: Kyu-Ho
authors.initials: KH
authors.lastname: Lee
authors.affiliation: Department of Anesthesiology and Pain Medicine, Soonchunhyang University Hospital, College of Medicine, Soonchunhyang University, Cheonan 330-100, Republic of Korea. Electronic address: ahnkiry@schmc.ac.kr.
authors.forename: Ki Ryang
authors.initials: KR
authors.lastname: Ahn
mesh_terms: D000328:Adult; D000368:Aged; D000768:Anesthesia, General / Q000295:instrumentation* / Q000379:methods; D004311:Double-Blind Method; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D017214:Laryngeal Masks; D008297:Male; D008365:Manometry / Q000295:instrumentation*; D008875:Middle Aged; D011312:Pressure; D011446:Prospective Studies