Secondary outcomes
SE
There was no significant difference in the dosage of propofol between the two groups (At T
A comparison of MAP and HR at distinct junctures between the two groupsData presented as mean ± SD. 
MAP and HR of two groups of patients at distinct juncturesNote: Data are presented as the mean ± SD.There was no significant difference in serum β-endorphin levels at T
Serum β-endorphin levels in the two groups at distinct juncturesNote: Data are presented as the mean ± SE.SE- Standard Error
Serum SOD (Note: Data are presented as the mean ± SE.