Bradycardia can be seen in healthy individuals, especially athletes, and also during sleep. If caused by a pathological condition, there may be organic heart disease, particularly in patients with acute myocardial infarction. If such a condition causes a significant decrease in cardiac output, affecting the blood supply to vital organs such as the heart, brain, and kidneys, then drugs like atropine or even intravenous drip of isoproterenol are used to increase the heart rate. Oral theophylline may be considered under general conditions. For severe sinus bradycardia leading to syncope where drug treatment is ineffective, it is recommended to install a permanent artificial cardiac pacemaker to prevent sudden sinus arrest.