system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 76-year-old man is brought to the emergency department by his daughter because he has been feeling lightheaded and almost passed out during dinner. Furthermore, over the past few days he has been experiencing heart palpitations. His medical history is significant for well-controlled hypertension and diabetes. Given this presentation, an electrocardiogram is performed showing an irregularly irregular tachyarrhythmia with narrow QRS complexes. The patient is prescribed a drug that decreases the slope of phase 0 of the ventricular action potential but does not change the overall duration of the action potential. Which of the following drugs is consistent with this mechanism of action?
assistant
Propafenone