comparative evaluation of different supraglottic ventilatory devices during general anaesthesia with controlled ventilation

ABSTRACT

Laryngeal mask airway [LMA], esophageal tracheal combitube [OTC], and laryngeal tube [LT] are ventilatory devices that are inserted easily and blindly as an alternative method to endotracheal intubations. They allowed safe ventilation with lesser pressor response. Sixty adult patients with mallampati score I and II scheduled for elective surgery under general anaesthesia with controlled ventilation. Patients were randomly divided into three equal groups, LMA was used in the first, OTC was used in the second and LT was used in the third group. The three devices were compared as regard insertion parameters, cardiovascular responses, adequacy of ventilation [oxygen saturation, end tidal carbon dioxide, air leak] and post removal complications. The three devices were effective in controlled ventilation with haemodynamic stability and adequate ventilation parameters. Manual manipulations needed to maintain a patent air way was less in LMA group [10%] in comparison to OTC [30%] and LT [30%] groups. However, air leak fraction was more evident in LMA group. After removal of the devices postoperative sore throat occurred more frequently with OTC and LT