title: Comparison of the i-gel and the LMA-Unique laryngeal mask airway in patients with mild to moderate obesity during elective short-term surgery.
abstract: The aim of our study was to compare leakage pressure, ease and time of insertion of the i-gel and the LMA-Unique laryngeal mask airway in patients with mild to moderate obesity during elective short-term surgery. In this prospective, randomised crossover trial, we included patients with a body mass index (BMI) >25 and <35 kg.m(-2) , and , age >18 years, undergoing elective surgery in the supine position with an expected duration of surgery <2 h. Leakage pressures, insertion difficulty, time and number of insertion attempts were evaluated. We included 50 patients consisting of 29 mildly (BMI>25 and < 30 kg.mg(-2) ) and 21 moderately (BMI>30 and < 35 kg.mg(-2) ) obese patients. Mean (SD) leakage pressures were 23.7 (9.2) cmH₂O (i-gel) and 17.4 (7.0) cmH₂O (LMA-Unique) (p<0.01). Subgroup analyses showed leakage pressures of 22.2 (9.4) cmH₂O (i-gel) and 17.5 (7.5) cmH₂O (LMA-Unique) (p=0.013) in the mild subgroup, and 25.7 (8.6) cmH₂O (i-gel) and 17.0 (6.2) cmH₂O (LMA-Unique) (p<0.01), in the moderate subgroup. Insertion of the i-gel was associated with significantly higher leakage pressures compared with the LMA-Unique in mildly and moderately obese patients.
authors.affiliation: Department of Anesthesiology, General Intensive Care and Pain Control, Medical University of Vienna, Vienna, Austria. ulrike.weber@meduniwien.ac.at
authors.forename: U
authors.initials: U
authors.lastname: Weber
authors.forename: R
authors.initials: R
authors.lastname: Oguz
authors.forename: L A
authors.initials: LA
authors.lastname: Potura
authors.forename: O
authors.initials: O
authors.lastname: Kimberger
authors.forename: A
authors.initials: A
authors.lastname: Kober
authors.forename: E
authors.initials: E
authors.lastname: Tschernko
mesh_terms: D000328:Adult; D000399:Air Pressure; D000768:Anesthesia, General / Q000379:methods; D001794:Blood Pressure; D015992:Body Mass Index; D018592:Cross-Over Studies; D017558:Elective Surgical Procedures / Q000295:instrumentation*; D004867:Equipment Design; D004868:Equipment Failure; D005260:Female; D006339:Heart Rate; D006801:Humans; D017214:Laryngeal Masks; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications*; D011446:Prospective Studies; D055815:Young Adult