Abstract
Sinus rhythm is diagnosed based on 12-lead ecg recording. Diagnostic criteria are as follows: positive P waves in limb lead I and II and negative in aVR; PR interval of at least 120 ms; the difference of consecutive P-P interval should be less than 120 ms. A sinus rate limit is between 50-100/min. Numerous factors: physiologic, pathologic, medications, drugs and stimulants could increase sinus rate. Sinus tachycardia is also observed in inappropriate sinus tachycardia and postural orthostatic tachycardia syndrome. ESC guidelines related to latter two syndrome are summarized.
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