The goal of this clinical trial is to observe the effect of low dose continuous infusion of esmolol on perioperative stress response in patients undergoing airway intervention .
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Changes in plasma norepinephrine levels
Timeframe: up to 30 minutes after beginning of operation
Changes in plasma epinephrine levels
Timeframe: up to 30 minutes after beginning of operation
Changes in plasma cortisol levels
Timeframe: up to 30 minutes after beginning of operation