The aim of this clinical trial is to assess preemptive oral pregabalin administration in the obese patients undergoing laparoscopic sleeve gastrectomy. The main aims of the study are to evaluate postoperative pain treatment and effect on the intraoperative hemodynamical stability. The participants will be divided into 2 groups: with or without preemptive pregabalin administration.
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Total postoperative oxycodone consumption
Timeframe: Day "0"
Postoperative pain score in NRS scale
Timeframe: Day "0", assessed 1 hour after operation
Postoperative pain score in NRS scale
Timeframe: Day "0", assessed 6 hour after operation
Postoperative pain score in NRS scale
Timeframe: Day "0", assessed 12 hour after operation
Postoperative pain score in NRS scale
Timeframe: Day "0", assessed 24 hour after operation