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A period of elevated heart rates is typically followed by very slow heart rates when the tachycardia ends.Abnormal heart rhythms are often made worse by medications such as digitalis, calcium channel blockers, beta-blockers, and anti-arrhythmics. ...
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Cardiac amyloidosis, a condition in which amyloid, a kind of protein, builds up in heart tissue, may affect the sinus node. Other conditions, such as sarcoidosis(round bumps in the tissue surrounding the heart and other organs), Chagas' disease(re...
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