There are only a few sinus ... rhythm that changes morphology and axis within a few beats (see V1 rhythm strip at that bottom) is characteristic of polymorphic (meaning many shapes) ventricular ...
A sinus morphology is an upright P wave in lead II and biphasic (up and down) P wave in lead V1. The first ECG strip below shows a P wave with sinus morphology, thus normal sinus rhythm.
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