I hope someone has some ideas here--fortunately, as far as I know, there is nothing serious going on but I'm sort of curious. It seems that there are some knowledgeable "cardiac" people here, so I thought I'd throw this out. I will also say that I will be seeing my GP on April 12th. Yesterday, I had my follow up appointment with my gastroenterologist. A month ago I had an upper endoscopy and a colonoscopy to make sure I had no internal bleeding (I have iron deficiency). I had some problems during the procedure in that they had to give me a LOT of drugs to knock me out and, even then, I woke up several times during the colonoscopy portion. So yesterday the doctor tells me that in all the years he's done these procedures, I am the only patient who had the highest resting heart rate of 145 bpms. What he means by resting is that when I was supposedly sedated, my heart rate was at 145. Now, prior to the procedure, before drugs, as I was waiting to go in, I was a nervous wreck. My pulse was at 120, and it was also around 120 right before the sedated me. Apparently it kept going up, even though I *was* feeling relaxed. I do have a history of sinus tachycardia. This could be due to being on thyroid meds and having a lower than normal TSH. I've also had several EKGs, holter monitoring, and an echocardiogram. All showing normal heart, no arrythmias, just "sinus tachycardia" at times. So--this kind of bothers me. The doctor says that it's just because of my anxiety. I know I have anxiety but have never had it do that and I've had many surgical procedures. I do know that they used a TON of Demerol during the procedure and some Versed. But mainly Demerol. I wonder if it was more the drug's fault. Or should I be going back to the cardiologist?