bradycardia
heart rate that is below the normal range
heart conduction disease
cardiovascular system disease that involves the heart's electrical conduction system
sick sinus syndrome
group of abnormal heart rhythms (arrhythmias) presumably caused by a malfunction of the sinus node, the heart's primary pacemaker
reflex bradycardia
decrease in heart rate
sinus bradycardia
sinus bradycardia is a sinus rhythm with a rate that is lower than normal