I had idiopathic tachycardia (meaning my heart rate was unusually high for no known reason) for years prior to WLS. My average resting heart rate, was between 90-100bpm, and very often even higher than that. I'm now 8 months post-op and my heart rate has slowly come down to about 70bpm. Similarly, my doctor is not at all concerned and seems to think its an indicator of improved health, so I honestly don't worry about it too much. If you start to have odd symptoms (lethargy, dizziness, shortness of breath, or anything else unexplainable) definitely check in with your Dr again.