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Heart rate (beat/min)
T1: Preoperative, T2: Before medication, T3: 1 min after medication, T4: During extubation, T5: 1 min after extubation, T6: 3 min after extubation, T7: 5 min after extubation, T8: 10 min after extubation. Group I: Esmolol Group, Group II: Control Group
