The Pentax Airwayscope, the Glidescope, and the Truview EVO2 constitute three novel
laryngoscopes that facilitate visualization of the vocal cords without alignment of
the oral, pharyngeal, and tracheal axes. We compared these devices with the Macintosh
laryngoscope in a simulated easy and difficult laryngoscopy.
Thirty-five experienced anaesthetists were allowed up to three attempts to intubate
in each of four laryngoscopy scenarios in a Laerdal SimMan manikin. The time required
to perform tracheal intubation, the success rate, number of intubation attempts and
of optimization manoeuvres, and the severity of dental compression were recorded.
In the simulated easy laryngoscopy scenarios, there was no difference between the
study devices and the Macintosh in success of tracheal intubation. In more difficult
tracheal intubation scenarios, the Glidescope and Pentax AWS, and to a lesser extent
the Truview EVO2 laryngoscope demonstrated advantages over the Macintosh laryngoscope
including a better view of the glottis, greater success of tracheal intubation, and
ease of device use. The Pentax AWS was more successful in achieving tracheal intubation,
required less time to successfully perform tracheal intubation, caused less dental
trauma, and was considered by the anaesthetists to be easier to use.
The Pentax AWS laryngoscope demonstrated more advantages over the Macintosh laryngoscope
than either the Truview EVO2 or the Glidescope laryngoscope, when used by experienced
anaesthetists in difficult tracheal intubation scenarios.