Sinus Tachycardia



Sinus tachycardia. The P wave is upright in lead II followed by a narrow QRS. The P wave here is seen right after the T wave. The rate is about 150 bpm. 


Sinus tachycardia with a bundle branch block. The P wave is upright in lead II followed by wide QRS (QS pattern in V1). The P wave is wave is partly merged with the T wave. The rate is about 115 bpm.

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