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 #Normal #SinusRhythm #nsr #cardiology #diagnosis #ekg #ecg #electrocardiogram #criteria
