Insertion of Preformed flexible endotracheal tubes through the Intubating LMA on a Manikin

ABSTRACT

Objective:  To assess the success rate of blind tracheal intubation with flexible endotracheal tube through the intubating laryngeal mask airway (ILMA) on a manikin. Design: Descriptive study.Methods:  Thirty unskilled volunteers were assigned to insert a preformed flexible endotracheal tube (SheridanTM) through the inserted ILMA on the manikin which optimal positioning was already confirmed by fiberoptic bronchoscope. The success rate and time of the insertion were recorded, also difficulty of the insertion was graded by both intubator using VAS and by observer using 3- point rating scale as well.Results: Blind tracheal intubation through the ILMA was successful in all intubators. The time for intubation ranged from 7.50 to 13.28 sec. (mean 10.14 + 1.58 sec.) and the intubation was graded as easy either assessed by the observer (grade 1) or by the intubators (mean VAS =2.39+ 1.20).     Conclusion: Blind tracheal intubation through the optimal position of ILMA using a preformed flexible endotracheal tube is easy to perform by unskilled personnel with high success rate. This technique may be useful for patients whose airway management is expected to be difficult. Keywords 1. Intubating LMA, 2. Techniques, 3. Preformed endotracheal tubes,                  4. Unskilled personnel,  5. Manikin