Boisson-Bertrand D
Service d'anesthésie-réanimation, Hôpital central, Nancy.
Rev Med Suisse Romande. 1999 Nov;119(11):919-20.
The COPA is longer than a Guedel airway. It raises the base of tongue and pushes the epiglottis forward improving the airways. So it finds a place in management of difficult airway, especially when face mask ventilation failed. Some authors tried to intubate with a bougie of a fiberscope when the COPA is in place, but this is not yet a frequent use.