Recently we responded to a call with two I's and one basic. Cardiac arrest with CPR in progress 5 min prior to EMS arrival. Regular intubation was attempted twice unsuccessfully, followed by the combitube. we attempted four combitubes, unsuccessfully despite our attempts. The pt. had vomited requiring suction; improper placement of tube made vomit keep coming. Packing the air way full of vomit and blood "reason for failed further intubation. Finally an oral airway was placed and a BVM used. Pt. got little to no air. All other protocols for cardiac arrest where fallowed. Pt. was shocked with no success, and sadly didn't make it. What did we do wrong with this call?