ACLS ProMed Practice Test

In non-shockable cardiac arrest rhythms, the priority is to restore and maintain perfusion while addressing treatable underlying problems. High-quality CPR with minimal interruptions keeps blood flowing to the brain and heart, while actively identifying and treating reversible causes (the Hs and Ts) such as hypoxia, hypovolemia, electrolyte disturbances, acidosis, toxins, tamponade, tension pneumothorax, and thrombosis. Epinephrine 1 mg IV/IO every 3-5 minutes is given to improve perfusion pressures during CPR and increase the chance of ROSC. Defibrillation isn’t effective for asystole or pulseless electrical activity, so delivering a shock would not help and delays ongoing CPR and cause treatment gaps. Waiting for ROSC without continuing CPR and addressing reversible causes also reduces survival chances.