What may cause sinus bradycardia?
1) Being asleep
2) An athlete
3) Carotid sinus massage
4) Valsalva maneuver
5) Hypothermia
6) Increased intraocular pressure
7) Vagal stimulation
8) Medications such as beta-blockers (metoprolol, propranolol, atenolol) or calcium channel blockers (amlodipine, verapamil)
9) Hypothyroidism
10) Hypoglycemia
11) Inferior myocardial infarction