・Group I
Persistent and otherwise unexplained extreme sinus bradycardia at a heart rate of less than 50 beats/min.

・Group Ⅱ
At least one documented episode of sinus arrest or sinoatrial block, with A-V junctional or ventricular escape beats.

・Group III
All these patients exhibited either of the bradyeardic mechanisms of groups I and Ⅱ. In addition, each had at least one documented episode of a supraventricular tachycardia, either paroxysmal atrial tachycardia , atrial fluter , or atrial fibrilation.


1)Rubenstein JJ, Schulman CL, Yurchak PM, DeSanctis RW. Clinical spectrum of the sick sinus syndrome. Circulation. 1972 Jul;46(1):5-13. doi: 10.1161/01.cir.46.1.5. PMID: 5039825.

ほぼ初めての心電図 P182-183