You're so accustomed to the sacred language that you no longer recognize the same meanings when communicated in standard English.
We used to call PVC's with a different shape "Multi-Focal" PVC's and it was assumed that, since they displayed as a different shape on the EKG strip, indicating different pathways through the ventricles of the heart, that they originated in different places of the ventricles.
It turns out that quite often, one focal are of the ventricle is responsible for the PVC's despite the different shape on the EKG strip, it is just that, since they are completely removed from the normal conduction system pathway of the heart, it is not uncommon for the impulse starting at the same place to take a different route for each impulse.
We now call them mono-morphic (same shape) or poly-morphic (different shape) PVC's, since the previous wording was (like you) often factually incorrect.
Language matters. If you don't know the language, you probably shouldn't try to speak it.
