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You are seeing a 70-year-old female in A&E who has presented with a sudden onset of chest pain and feeling as though her heart is beating out of her chest. She has been experiencing this for the last 72 hours. You perform an ECG and you note the rhythm is in atrial fibrillation. Her observations are within normal limits and you note that she is haemodynamically stable. What is the next most appropriate step in management?