Tags: Disease.
Sick sinus syndrome (SSS) also called sinus node dysfunction (SND) is an umbrella term for a group of abnormal heart rhythms (arrhythmias) presumably caused by a malfunction of the sinus node the heart’s primary pacemaker. Bradycardia-tachycardia syndrome is a variant of sick sinus syndrome in which slow arrhythmias and fast arrhythmias alternate. It is often associated with ischaemic heart disease and valvular lesions.
