It is important to note that the

failure of one device increases the possibility of failure of the next one, for example, in an obese patient with

positive predictors of difficulty for intubation, has a higher incidence of difficulty for ventilation

(including ventilation through a supraglottic device); likewise, percutaneous access to VA can be

very complicated.

Fortunately, we can exchange between these

access to the VA when one of them fails, being able to be

used interchangeably as a rescue for oxygenation

of the patient.

British Journal of Anaesthesia, 117 (S1): i20–i27 (2016) doi: 10.1093/bja/aew175