<unk>  is a<unk>  node dysfunction with a rate that is lower than normal. In humans,<unk>  is generally defined to be a rate of under 60 beats per minute. A normal heartbeat in human is usually at a rate of 60 to 100 beats per minute.
Sinus bradycardia
Sinus arrhythmia
Automatic tachycardia
Junctional tachycardia
Hypopyon
Sinus tachycardia
Inappropriate sinus tachycardia
Paroxysmal tachycardia