One of the toughest problems in the care of patients with atrial fibrillation (AF) is sorting out symptoms. The largest group of AF patients have some symptoms but whether it correlates with the heart rhythm (regular or not) is hard to know. Then we assess whether the patient feels better in regular sinus rhythm (SR). You may be thinking: of course, people feel better in regular sinus rhythm. In these two patients, there is clearly a poor correlation between the heart rhythm and symptoms.