1 BACKGROUND Due to the preclusion of live human studies of choking on ethical grounds, and prior to going to market, LifeVac™, conducted tests including a single adult cadaver study1 to assess the efficacy of the device in removing foreign bodies from the airway. Following this, there was criticism, that as a single study has so many variables, that the results could not be treated as definitive and only represented a low level of evidence.