We prospectively registered data according to the Utstein-style template for reporting data from pre-hospital advanced airway management from February 1st 2011 to October 31st 2012. Included were consecutive patients at all ages with pre-hospital cardiac arrest treated by eight anaesthesiologist-staffed pre-hospital critical care teams in the Central Denmark Region.
We registered data from 595 cardiac arrest patients; in 60.2% (n = 358) of these cases the pre-hospital critical care teams performed pre-hospital advanced airway management beyond bag-mask ventilation. An initial end-tidal CO2 measurement following pre-hospital advanced airway management were available in 75.7% (n = 271) of these 358 cases. We identified 22 patients, who had an initial end-tidal CO2 at or below 1.3 kPa. Four of these patients achieved return of spontaneous circulation.
Our results indicates that an initial end-tidal CO2 at or below 1.3 kPa during pre-hospital CPR should not be used as a cut-off value for the achievability of return of spontaneous circulation.