title: Randomized Comparison of Actual and Ideal Body Weight for Size Selection of the Laryngeal Mask Airway Classic in Overweight Patients.
abstract: Size selection of the laryngeal mask airway (LMA) Classic based on actual body weight remains a common practice. However, ideal body weight might allow for a better size selection in obese patients. The purpose of our study was to compare the utility of ideal body weight and actual body weight when choosing the appropriate size of the LMA Classic by a randomized clinical trial. One hundred patients with age 20 to 70 yr, body mass index ≥25 kg/m(2), and the difference between LMA sizes based on actual weight and ideal weight were allocated to insert the LMA Classic using either actual body weight or ideal body weight in a weight-based formula for size selection. After insertion of the device, several variables including insertion parameters, sealing function, fiberoptic imaging, and complications were investigated. The insertion success rate at the first attempt was lower in the actual weight group (82%) than in the ideal weight group (96%), even it did not show significant difference. The ideal weight group had significantly shorter insertion time and easier placement. However, fiberoptic views were significantly better in the actual weight group. Intraoperative complications, sore throat in the recovery room, and dysphonia at postoperative 24 hr occurred significantly less often in the ideal weight group than in the actual weight group. It is suggested that the ideal body weight may be beneficial to the size selection of the LMA Classic in overweight patients (Clinical Trial Registry, NCT 01843270).
authors.affiliation: Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, 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, Korea.
authors.forename: Jong Seok
authors.initials: JS
authors.lastname: Lee
authors.affiliation: Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Sang Beom
authors.initials: SB
authors.lastname: Nam
authors.affiliation: Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hyo Jong
authors.initials: HJ
authors.lastname: Kang
authors.affiliation: Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Ji Eun
authors.initials: JE
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D001835:Body Weight; D004867:Equipment Design; D006804:Ergonomics / Q000379:methods*; D005260:Female; D006801:Humans; D056865:Ideal Body Weight / Q000502:physiology*; D017214:Laryngeal Masks / Q000145:classification*; D008297:Male; D008875:Middle Aged; D050177:Overweight / Q000503:physiopathology*; D017755:Prosthesis Fitting / Q000379:methods*; D015203:Reproducibility of Results; D056910:Republic of Korea; D012680:Sensitivity and Specificity; D055815:Young Adult
keywords: Airway Management; Body Weight; Complications; Laryngeal Masks