Final answer:
After defibrillating a patient with pulseless ventricular tachycardia, the next action is to commence CPR to maintain blood flow until the heart can pump effectively on its own.
Step-by-step explanation:
When a patient experiences pulseless ventricular tachycardia, a form of cardiac emergency, and is defibrillated, the next immediate action is to commence Cardiopulmonary Resuscitation (CPR).
Defibrillation delivers a shock and can terminate the arrhythmia, but CPR is essential immediately following defibrillation to maintain blood flow until the heart can effectively pump blood on its own or until advanced life support is available. Once CPR has been initiated, it is continued until signs of return of spontaneous circulation (ROSC) are observed, at which point further medical assessment and interventions can take place.