A few years ago, I had surgery( laparotomy) which was uneventful, upon awakening from the anesthesia, I found myself in sinus tachycardia
(110bpm) for approximatey 7 hrs. The PACU staff wasnt overly concerned, the sinus tach broke about 9 hrs post op. A few months later, I had a second procedure, when I woke up, again the sinus tach, this time my heart was running between 120-140bpm. EKG showed nothing unusual.