title: Comparison of Four Different Supraglottic Airway Devices in Terms of Efficacy, Intra-ocular Pressure and Haemodynamic Parameters in Children Undergoing Ophthalmic Surgery.
abstract: OBJECTIVE
  The aim of this study was to compare insertion parameters of four different types of supraglottic airway devices (SGAD) (Classic LMA, I-gel LMA, Proseal LMA, Cobra PLA) in children undergoing ophthalmic surgery and to determine the effect on intra-ocular pressure (IOP) and haemodynamic responses during insertion.
  
  
  METHODS
  Sixty American society of Anesthesiologists (ASA) I-II children aged 1-10 years undergoing extra-ocular ophthalmic surgery were randomly divided into four groups (Group LMA, Group I-gel LMA, Group PLMA and Group CPLA) in this prospective, randomised study. Anaesthesia was induced with decreasing sevoflurane concentrations (8%-2%) in a mixture of 50% N2O-O2. All SGADs were inserted under deep anaesthesia. The characteristics of insertion (number of attempts, ease and time), oropharyngeal leak pressure (OLP) and complications were recorded. IOP in both eyes, heart rate (HR), mean arterial pressure (MAP) and EtCO2 were measured before and 2 and 5 min after insertion of the SGADs.
  
  
  RESULTS
  There was no difference between the groups in terms of the characteristics of insertion. The mean IOP did not increase significantly in all groups. MAP and HR changes were similar among the groups during follow-up. In all groups, HR increased 2 min after insertion (statistically insignificant) and returned to the baseline value 5 min after insertion. A statistically significant correlation was seen between HR increase and IOP values before and after insertion of the SGADs (p=0.006, correlation coefficient=0.352). Desaturation was seen in one patient in Groups LMA, PLMA and CPLA, and laryngospasm was seen in two patients in Group CPLA and in one patient in Group LMA.
  
  
  CONCLUSIONS
  It was seen that during insertion of Classic LMA, I-gel LMA, Proseal LMA and Cobra PLA, IOP did not increase and haemodynamic stability was maintained in children undergoing extra-ocular ophthalmic surgery.
authors.affiliation: Clinic of Anaesthesiology and Reanimation, Ministry Health Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Gökhan
authors.initials: G
authors.lastname: Peker
authors.affiliation: Clinic of Anaesthesiology and Reanimation, Ministry Health Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Suna Akın
authors.initials: SA
authors.lastname: Takmaz
authors.affiliation: Clinic of Anaesthesiology and Reanimation, Ministry Health Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Bülent
authors.initials: B
authors.lastname: Baltacı
authors.affiliation: Clinic of Anaesthesiology and Reanimation, Ministry Health Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Hülya
authors.initials: H
authors.lastname: Başar
authors.affiliation: Clinic of Anaesthesiology and Reanimation, Ministry Health Ankara Training and Research Hospital, Ankara, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Kotanoğlu
keywords: Laryngeal mask; haemodynamics; intra-ocular pressure