Influence of different head and neck positions on oropharyngeal leak pressures and cuff positions with Ambu® AuraGainTM laryngeal airway in children

Abstract

Background: Ambu® AuraGain™ laryngeal airway is a supraglottic airway device designed to provide better airway protection and airway seal pressures. Aim of Study: To quantify oropharyngeal leak pressures (OPLPs), fibreoptic view, peak airway pressure and ventilation scoring with Ambu® AuraGain™ in children in different head and neck positions such as maximum flexion, maximum extension and lateral rotation. Patients and Methods: Sixty-eight children aged between 1 and 6 years posted for surgery were enrolled. Ambu® AuraGain™ was inserted after the induction of anaesthesia and ventilation was confirmed. OPLP, fibreoptic view, peak airway pressure and ventilation scores were noted in different head and neck positions such as maximum flexion, maximum extension and lateral rotation. Results: The OPLP significantly increased in flexion (P < 0.001) and significantly decreased in extension (P < 0.001) when compared to the neutral position. Airway pressure (Paw) increased significantly in flexion (P < 0.001) and decreased in extension (P = 0.04) when compared to the neutral position. Tidal volume delivery was comparable in all positions. There was a statistically significant decrease in ventilation scoring in the flexed position when compared to the neutral position (P = 0.005). There was a significant worsening of fibreoptic view in flexion when compared to the neutral position (P < 0.001). Fibreoptic view in the lateral position and extension was comparable with the neutral position. Conclusions: Use of Ambu® AuraGain™ laryngeal airway provides the best ventilatory parameters and Paw in children with head in the neutral and lateral position but lower OPLP with head in extension. However, flexing the head results in the worst ventilatory parameters and Paw among the positions studied.