Can you tell me if atrial fibrillation with ventricular standstill is recognized from fine v-fib?

Afib/vfib. ventricular standstill and fine v-fib are functionally the same the ventricle is not contracting - vfib is a slight quivering which may or may not be identifiable on ECG; if the ventricle is not contracting then it is not possible to non-invasively identify atrial fibrillation from simply sinus/atrial arrest.