<unk>  is any of a large and heterogeneous group of conditions in which there is abnormal electrical activity in the heart. The heart beat may be too fast or too slow, and may be regular or irregular. A heart beat that is too fast is<unk> lled tachycardia and a heartbeat that is too slow is<unk> lled bradycardia. Although many<unk> s are not life-threatening, some<unk> n<unk> use<unk> rdiac arrest.
Cardiac arrhythmia
Atrial infarction
Sinus arrhythmia
Atrial fibrillation
Pacemaker mediated tachycardia
Supraventricular tachycardia
Ventricular tachycardia
Torsades de pointes