What can we learn from this 3-channel ECG?
A sinus rhythm can be seen in the left half of the image, which merges into a ventricular tachycardia on the right. The QRS complexes of the VT change their shape and polarity, this is called polymorphic.
The question is: can this be called TdP (Torsade de Pointes) tachycardia or not? The clear answer is: no! A polymorphic VT may only be called TdP if there is a prolonged QT/QTc duration in the native rhythm. This is obviously not the case here. Therefore, the term polymorphic VT is retained here