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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)
A slow heart rate is called bradycardia. Some irregular heartbeats are normal: 1  Sinus arrhythmia is the normal variation in heart rate that accompanies breathing in and out.  Sinus tachycardia is the normal increase in the heart rate that occurs in healthy people when they are excited, exercising, or have a fever.