Hey, I had tachycardia (increased heart-rate) immediately post-op, for about 13 hours. The aneasthestics and analgesics will affect blood pressure, and the palpitations are a symptom of your heart and circulatory system coping with the raised, or lowered, BP. The nurse should know this!! How long ago was your op?
If you’re concerned I would contact your GP to check what they say…
K