Final answer:
For a patient who becomes unresponsive with ventricular fibrillation post-cardiac arrest resuscitation, the correct action is to give an immediate unsynchronized high-energy shock (defibrillation dose), as this is crucial for attempting to restore a normal heart rhythm.
Step-by-step explanation:
A patient who has been resuscitated from cardiac arrest and subsequently becomes unresponsive with ventricular fibrillation requires immediate medical intervention. The correct action to take is A. Give an immediate unsynchronized high-energy shock (defibrillation dose). This is because ventricular fibrillation is a life-threatening condition where the heart exhibits uncontrolled, irregular contractions, making it unable to effectively pump blood. Immediate defibrillation is crucial for attempting to restore a normal sinus rhythm.
Automated external defibrillators (AEDs) are commonly used in emergency situations to diagnose and treat life-threatening cardiac arrhythmias such as ventricular fibrillation. AEDs provide verbal instructions and are designed to be used by nonmedical personnel. These devices can analyze the patient's heart condition and automatically apply the shock with appropriate energy and waveform. If available, CPR should be administered prior to using an AED.