Abstract
AIM: To evaluate an algorithm that uses an end-tidal carbon dioxide (ETCO(2)) target of ≥ 30 torr to guide specific changes in chest compression rate and epinephrine administration during cardiopulmonary resuscitation (CPR) in paediatric swine. METHODS: Swine underwent asphyxial cardiac arrest followed by resuscitation with either standard or ETCO(2)-guided algorithm CPR. The standard group received chest compressions at a rate of 100/min and epinephrine every 4 min during advanced life support consistent with the American Heart Association paediatric resuscitation guidelines. In the ETCO(2)-guided algorithm group, chest compression rate was increased by 10 compressions/min for every minute that the ETCO(2) was < 30 torr, and the epinephrine administration interval was decreased to every 2 min if the ETCO(2) remained < 30 torr. Short-term survival and physiologic data during active resuscitation were compared. RESULTS: Short-term survival was significantly greater in the ETCO(2)-guided algorithm CPR group than in the standard CPR group (16/28 [57.1%] versus 4/28 [14.3%]; p = 0.002). Additionally, the algorithm group had higher predicted mean ETCO(2), chest compression rate, diastolic and mean arterial pressure, and myocardial perfusion pressure throughout resuscitation. Swine in the algorithm group also exhibited significantly greater improvement in diastolic and mean arterial pressure and cerebral perfusion pressure after the first dose of epinephrine than did those in the standard group. Incidence of resuscitation-related injuries was similar in the two groups. CONCLUSIONS: Use of a resuscitation algorithm with stepwise guidance for changes in the chest compression rate and epinephrine administration interval based on a goal ETCO(2) level improved survival and intra-arrest hemodynamics in this porcine cardiac arrest model.