title: Another kind of heart rhythm problem. It's called "sick sinus syndrome" and could be the reason you are slowing down. Learn how to spot and treat this condition.
mesh_terms: D006304:Health Status; D006339:Heart Rate; D006801:Humans; D040242:Risk Reduction Behavior; D012804:Sick Sinus Syndrome / Q000175:diagnosis* / Q000628:therapy*