<unk>  is generally characterized as a heart rhythm of less than 60 beats per minute. It can be a significant problem if the heart doesn't pumps enough oxygen-rich blood into the bloodstream. When symptomatic, fatigue, weakness, dizziness, nausea and fainting will result. Numerous factors influence it, differing in part with age and conditioning. Sinus arrhythmia, variation in sinus rate due to respiratory processes, also causes sinus<unk> . It is graded by impulse origin i.e. atria, AV junction, ventricles, and infantile. There are numerous pathophysiological disorders that can contribute to<unk>  such as acute myocardial infarction, obstructive sleep apnea, elevated vagal activity, heightened intracranial pressure, and infectious diseases such as Lyme disease, rocky mountain spotted fever, Chagas disease, psittacosis, Q fever and typhoid fever but the most common are sinus node and AV node dysfunction.
Bradycardia
Tachycardia
Normotension
Sinus bradycardia
Junctional bradycardia
Apnea
QT prolongation
Bradypnea