We would like to thank Drs. Youngblood and Harbott for their interest in our article1 and for their valuable comments. In their letter, they voiced concerns about the methodology and interpretation of our results. At first, we have to mention the issue on the discrepancy in postoperative fentanyl consumption between current study and our historic control2 because Drs. Youngblood and Harbott believe that inconsistency in opioid consumption is one of the important evidences of withdrawal from remifentanil. As we had briefly described in the method sections of both studies, the surgical procedures were different from each other; the one in the former study was open ureteroneocystostomy via a 4-5 cm of Pfannenstiel incision (open Cohen technique), whereas the one in the current study was laparoscopic Cohen surgery under pneumove-sicum.
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