Greetings. Welcome to HCM and thank you for your question. I carefully read your query. This is a case with paroxysmal atrial fibrillation. Paroxysms, or arrhythmia bouts, of atrial fibrillation are related to other factors and not time. If these episodes happen in a terrain of an enlarged left, right or both atria, then factors like moderate to vigorous physical activity, alcohol intake, psychological stress can trigger these arrhythmia bursts. The issue here is to complete tests and to install the proper treatment, so we can prevent these episodes from happening. Therefore, a careful echocardiogram should be run, so we can assess and evaluate the size and function of all heart chambers and valves, and there are certain factors that decide further treatment and preventive measures. Warfarin or other oral anticoagulants can be discontinued once we are certain that there is no thrombus in atrial auriculae, in the echocardiogram. I am assuming that the atrium will be borderline normal or slightly enlarged, and this mandates higher dosage or beta-blockers or antiarrhythmic drugs, like amiodarone, to prevent these episodes from happening. I recommend him to do these exams and discuss with a cardiologist about the dosage and frequency of usage of the beta-blocker and/or antiarrhymthic drugs. I hope I was helpful with my answer. Take care. Best regards, Dr. Meriton