Multifocal atrial tachycardia
Multifocal atrial tachycardia (MAT) is heart racing caused by multiple irritable spots in the top of the heart. It occurs most commonly in patients with chronic obstructive pulmonary disease or COPD (emphysema or chronic bronchitis). Most patients do not have symptoms from MAT since the heart rates are usually not very fast (130-150 beats per minute). When treatment for the lung problems improves pulmonary function, MAT usually goes away. Heart rhythm medications may be tried in rare patients. Ablation is very rarely required and seldom effective given the fact that many irritable spots exist.