Final answer:
The nurse should respond to the patient by explaining that they had a serious abnormal heart rhythm, which was successfully reversed with treatment.
Step-by-step explanation:
The most appropriate response by the nurse is c. 'You had a serious abnormal heart rhythm, which treatment was able to reverse.' Ventricular fibrillation is a serious condition in which the ventricles of the heart beat in a wild, uncontrolled manner, preventing the heart from pumping effectively. It is a medical emergency that requires immediate treatment, such as defibrillation. Defibrillation uses electrical therapy to shock the heart and restore a normal rhythm. By explaining that the patient had a serious abnormal heart rhythm that was successfully treated, the nurse provides accurate and reassuring information to the patient.