Clinical Studies on Sick Sinus Syndrome

Six patients of sick sinus syndrome were described with review of literatures, who demonstrated either persistent unexpected sinus bradycardia (5 patients) with sinus arrest in one patients or bradycardia-tachycardia syndrome (1 patient). These occurred due to disorders of sinoatrial conduction and depression of atrioventricular junctional escape pacemaker system. Singificant atrioventricular block was not present. Coronary heart disease, hypertension, valvular heart disease, and tetanus were demonstrated where etiology could be determined, but in one patient no clear etiologic diagnosis could be established. Syncope and dizziness were common sympotms and in one patients with atrial fibrillation occurred cerebral embolism.