What's to be done about it.
Normal hearts increase their output with exercise.
Anticoagulation drugs are given first to destroy clots they may have formed and prevent stroke from emboli-loosened clots. If the fibrillation continues, the response of the ventricle can be slowed by beta blockers, verapamil or digitalis. Patient compliance is essential. The aspirin is one regular aspirin by mouth daily. The right treatment involves adding up the dangers of the rate itself, the severity of the underlying heart disease, the presence of atrial clots, the prevention of embolization, and the risk to benefit balance of preventing clots by warfarin blood thinner or aspirin.