Bradycardia generally refers to a heart rate of less than 60 beats per minute, often seen in healthy young people, athletes, and during sleep. Other possible causes include hypothyroidism, obstructive jaundice, as well as severe hypoxia and hypothermia. If the patient's bradycardia does not cause other pathological conditions, such as dizziness or fainting, it generally does not require treatment. If severe dizziness and fainting occur, indicating insufficient cardiac output, medications that increase the heart rate, such as atropine or aminophylline, can be used. (These medications should be taken under the guidance of a doctor.)