Hello and hope you are doing well.
There are certain set criteria to define epileptiform activity. Sharp activity in order to be epileptiform needs to stand out significantly from the background (>50%) and disrupt it. This is usually in the form of a spike (<70ms) or sharp wave (70–200ms) with a slow wave that disrupts the background. To clarify your doctor has ordered for a 48 hr EEG.
Hope this helped and do keep us posted.
I'm not sure what sharp activity means. I was also admitted to the hospital, on two separate occasions, for stroke like symptoms. My MRI also shows lesions. They are in my frontal lobes. I was diagnosed with Hemiplegic migraines. None of the meds that I have tried worked for me. I tried topamax, anti depressants, and calcium channel blockers. I still get the migraines occasionally but I actually seem to be doing better without meds. Mine are worse with my period and seem to be worse when I eat processed foods. Do you get a headache after the stroke like symptoms? Have you had the symptoms more than once?