SVT (often AVNRT/AVRT) presents as sudden-onset regular narrow-complex tachycardia. Stable clients may receive vagal maneuvers and adenosine per orders. Unstable SVT requires synchronized cardioversion. Nurses monitor hemodynamics and 12-lead when available. Connect Supraventricular Tachycardia (SVT) to bedside cues you will reassess first: vitals trends, work of breathing, perfusion, mentation, and pain or ischemic equivalents when relevant. NCLEX items often reward recognizing when subtle instability outweighs reassurance, then selecting nursing actions that protect airway, circulation, and neurologic status before routine tasks.