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What can my dad do to keep his heart rate down before cataract surgery? - cataract more condition_symptoms

My father is 78 and was scheduled for cataract surgery last week. He was very concerned about this for 3 months. Although it produced nerve surgery. Your heart rate went to 135 and the eye as the cardiologist and he was hospitalized and now Lord wrote a prescription for Coumadin. This is more boring. In addition to cataract surgery is not done. All blood tests were normal. It seems a clear case of interest to me. This can be taken to prevent recurrence before cataract surgery?