Here's something for you fellas to consider which may or may not be of value to you:
I was diagnosed with high bp by my primary care phys for over 2 years. True to western medicine philosophy, every time I had a checkup or a cold...or ANYTHING he'd try to get me on high BP meds, but I resisted (my BP was in the 140 over 90 range).
Last fall I experienced a training injury and went to an orthopedic surgeon for a consult. The nurse took my BP and stated that sure enough, I had the same readings. She then apologized and stated that she had used the wrong cuff, and reiterated that they have bigger cuffs for their 'weight lifting patients'.
She switched the cuff and my top reading dropped to 129 - still not ideal but within normal range. My next visit to the Primary Care doc was interesting to say the least (we had some words), as my assumption was correct - they had been using a 'normal sized' cuff for my BP (I probably have average arms for T-Nation readers, 17" range)
I instructed him to use a larger cuff and received a top reading in the 120's - this is worth noting the next time you get checked. It may or may not be of consequence depending on your provider.
One last thing - I was able to drop another 7 points off my average by cutting down on my Diet Soda intake (the sodium content is brutal), as well as my total caffeine intake (now reserved for AM and only pre-workout), and in turn increasing my water intake to at least 1 gallon a day.
Make doubly sure that you're not injesting ANY caffeine or pre-workout stims, or working out - within 6-8 hours of getting your BP checked as all can dramatically skew your readings.
My NEW primary care doc is actually a creatine user himself - an active lifter and athlete and stays up to date on the latest journals, and, as we do, see NO reason to NOT take creatine, and in fact agrees with all of the benefits that T-Nation writers have been stating for years.
I asked him the same BP / Creatine cause and affect question myself, and he stated that the only reason creatine could cause a measurable increase in BP is as has been discussed - an insufficient fluid intake/dehydration, in which case a number of agents can raise BP.