###Human: Is it safe to discontinue Beta-blockers after aortic valve surgery? ###Assistant: Hello. I passed carefully through your concern and would like to explain that several components may maintain the patient heart rate at those levels (like pain due to surgery, local inflammation, potential fever, transient respiratory decreased capacity, relative anemia, relative hypovolemia, body immobility, psychological conditions, etc.). The causes mentioned above may at least partially contribute to her weakness and nausea, Beta-blockers may further deteriorate this clinical condition, especially in the case of relative hypotension and decreased overall cardiac performance. I would recommend monitoring her blood pressure values before taking her medications, and if the symptoms persist in withdrawing her Beta-blocker from therapy gradually. It is necessary to taper her daily Beta-blocker dose progressively to avoid the rebound effect of stopping Beta-blocker cold turkey. In such a case, the high heart rate would reappear again. So, discuss with her attending cardiologist to gradually stop the Beta-blocker by reducing the daily dose step by step. I hope to have been helpful to you. In case of any further questions, feel free to ask me again.