During a colonoscopy, does the anesthesiologist constantly monitor vital signs? I sometimes have a BP of 140/90 acc. To my primary doctor. Safe?

Absolutely. If an anesthesiologist is involved, vital signs including bp, heart rate, oxygen levels and now very mom only carbon dioxide levels are monitored continuously.
Yes. We do constantly monitor vital signs during colonoscopy. Also, even though your blood pressure is borderline high, you should be fine during the procedure. Peace of cake usually. You'll have an opportunity to talk to the professional anesthetist before the procedure as well.