Pathophysiology
Clinical meaning
Cardiac arrest occurs when effective cardiac mechanical activity ceases. Shockable rhythms (VF/pVT) involve disorganized or rapid ventricular electrical activity without effective contraction. Non-shockable rhythms (asystole/PEA) lack effective electrical or mechanical activity. Early defibrillation and high-quality CPR are the primary determinants of survival. Connect Cardiac Arrest ACLS to bedside cues you will reassess first: vitals trends, work of breathing, perfusion, mentation, and pain or ischemic equivalents when relevant. Boards reward recognizing when subtle instability outweighs reassurance, then selecting nursing actions that protect airway, circulation, and neurologic status before routine tasks.