Pop Quiz! What is the rhythm of this strip?
Why? Underlying rhythm is sinus but with events of PVC's after every two normal cycles (which is why its trigeminy) and the PVC's are different looking meaning they are from two different irritable foci in the ventricles. If they were the same irritable foci causing the PVC then that would be unifocal.
If you cannot tell already... I LOVE this stuff.