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Median [range] of plasma norepinephrine concentration at the different surgical time points. T0: Before induction of anesthesia = control; T1: After oro-tracheal intubation sequence; T2: At the end of peritoneal insufflation; T3: During adrenal gland dissection; T4: After clamping of the adrenal vein; T5: In the recovery room after extubation; *P < 0.05 (vs T0); **P < 0.05 (vs T0, T1, T2, T4, and T5)
