ECG APPEARANCES OF SINOATRIAL BLOCK

There are many electrocardiographic changes in sinoatrial block. Only 2nd and 3rd degree blocks can be analysed on surface recordings. Howev er, they manifest themselves by pauses, the descriptions of which are rich and varied. They also vary according to the circumstances of appa rition and the escape rhythms which accompany them. Related ECG change s such as chronotropic insufficiency or carotid sinus syndrome have be en described. However, their significance is not univocal and only a p recise analysis of the ECG recordings allows correct interpretation of the clinical and paraclinical signs and the institution of appropriat e therapy.