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There are many causes of slow heartbeat, and they range from mild to serious. A slow heartbeat may be caused by cardiovascular disorders or diseases such as: Cardiac arrhythmias. Cardiomyopathy (weakened or abnormal heart muscle and function) Cardiovascular disease (due to atherosclerosis, hardening of the arteries, or other causes) Sinus node disease (abnormality of the heartâs internal pacemaker)
Sinus bradycardia: A regular but unusually slow heart beat (50 beats/minute or less at rest). Sinus bradycardia can be the result of many things including good physical fitness, medications, and some forms of heart block. Sinus refers to the sinus node, the heart's natural pacemaker which creates the normal regular heartbeat. Bradycardia means that the heart rate is slower than normal. Fainting can occur with sinus bradycardia if the heart slows down even more. This can occur, for example, when the vagus nerve sends a signal to the heart that suddenly drops the heart rate. Choking or gagging can trigger this response which is called the vasovagal reflex.