| http://www.w3.org/ns/prov#value | - Except for certain individuals, such as people who are very physically fit, in whom a slower heart rate can be normal, bradyarrhythmias may occur as a result of serious medical conditions (eg, heart attacks), medication(s) (eg, beta-blockers and calcium-channel blockers), hypothyroidism, and electrolyte imbalances in the blood (NHLBI 2011b).
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