Final answer:
The best first step for the management of nonsustained ventricular tachycardia (NSVT) and PVCs in the first 48 hours post MI is defibrillation.
Step-by-step explanation:
The best first step for the management of nonsustained ventricular tachycardia (NSVT) and PVCs in the first 48 hours post MI is defibrillation. Defibrillation is the delivery of an electrical shock to the heart to restore a normal rhythm. It is the most common treatment for ventricular fibrillation, which is a life-threatening arrhythmia characterized by the ventricles not effectively pumping blood.