Wow, DR Ron Pulliam.
I've suspected that kind of last minute cancellation could happen to me due to high blood pressure, but it hasn't.
It was, however, the way I got started on BP medication in the first place some 14 years ago. I was at my doctor's for a pre-op checkup prior to a minor surgical procedure, and he identified me as a sufferer of WCS (White Coat Syndrome), as well as someone for whom it was time to start on BP medication. Fortunately, with a few modifications to the prescription over the years, it has benefited me well -- even in those WCS situations, which never ceases to amaze me.