Hey Jilly, good question about the premedication with this situation of yours.   Yes, you should premedicate, most definitely!!   You're shocking too much to try to get by with this search without premedicating!   Yet, if you are tapering down, try to juggle the days you are tapering to coincide with your premedication.  If you need, skip the day before and take the prednisone only on the day of the exam this way you don't double up and yet you are medicated properly for the exam.  I've taken 20mg for the premedication protocols and this has done just fine with me.   But make sure your doctors are aware of this in that even though you are properly premedicated, that things can still happen.  They should have an anesthesiologist on call to attend you during the exam even if you haven't reacted in the past.  

Jilly, I'm probably one of those patients who is most reactive to invasive procedures and I will go through the prolonged syncope in spite of being properly medicated for these procedures - I'm one of those in the high-risk category for these things.   These protocols have protected me very well with these procedures and I depend heavily upon them!  Yet my experience has taught me that you should never presume too much with masto, especially if you are going through a phase of unusual activity.  Even though you may not have had any problems in the past, you can't be too safe.  Request an anesthesiologist to be present, please.  Take the proper meds and go into your exam feeling safe and secure, for you are, but you should have an anesthesiologist present as well.  This way, your doctors will feel safe as well and everybody.

Keep safe!!