Take a look in the sinus bradycardia!!!

Sinus bradycardia: aetiology

"SINUS BRADICARDIA" (sinus bradycardia):

Sleep

Infections (myocarditis)

Neap thyroid (hypothyroid)

Unconsciousness (vasovagal syncope)

Subnormal temperatures (hypothermia)

Biliary obstruction

Raised CO2 (hypercapnia)

Acidosis

Deficient blood sugar (hypoglycemia)

Imbalance of electrolytes

Cushing's reflex (raised ICP)

Aging(old)

Rx (drugs, such as high-dose atropine)

Deep anaesthesia

Ischemic heart disease

Athletes