Amendments from Version 1
INFILTRATION
[version 2; peer review: 1 approvedNo competing interests were disclosed.



This revised article features notable improvements. The title has been refined to "Ketamine infiltration improves analgesia after thyroid surgery," accurately encapsulating the essence of the study.  Methodologically, difficult airways were considered as an exclusion criterion, and we specified the ketamine concentration used, which was 50mg/ml. We defined that rescue analgesic during hospitalization was Nefopam in the case of VAS values greater than 30. The randomization method was specified.  Our data, including age and type of surgery, have been carefully validated. We improved the discussion according to the recommendations of the reviewers.