(A) ECG showing sinus tachycardia with the rate of 123 bpm

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(A) ECG showing sinus tachycardia with the rate of 123 bpm (A) ECG showing sinus tachycardia with the rate of 123 bpm. If there is suspicion that the P-wave morphology is abnormal on the tachycardic rhythm, compare the P wave with the patient’s normal resting ECG. (B) ECG lead V1 detail of P wave and QRS morphology from the same patient in A at a rate within the normal range. The P wave and QRS complexes are identical in V1 leads Source: ARRHYTHMIAS, Atlas of Cardiovascular Emergencies Citation: Lefebvre C, O'Neill JC, Cline DM. Atlas of Cardiovascular Emergencies; 2015 Available at: http://accessemergencymedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1206/lefebvre_ch5_fig-05-01.png&sec=72943360&BookID=1206&ChapterSecID=72943351&imagename= Accessed: October 25, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved