Normal Sinus Rhythm - ECG Diagnosis

Normal sinus rhythm (NSR) is an impulse that originates in the sinus node. 

ECG Recognition:

It is recognized by the P wave morphology that is:

•	upright P in leads I, II and aVF

•	inverted in aVR

•	variable in leads III and aVL

•	upright in leads V4-V6 (in 12-lead ECG)

•	most often biphasic (positive-negative) in leads V1 and V2

•	with minor variations in morphology related to respiratory cycle



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