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OBJECTIVE	This study aimed to compare application of the Mller maneuver ( MM ) and application of drug-induced sleep endoscopy ( DISE ) prior to surgery , in addition to MM , to further ascertain the location of an obstruction in the upper airway and whether the location would change the surgical treatment plan in patients with retropalatal obstruction .
METHODS	Prospective , clinical trial at a tertiary referral hospital .
METHODS	This study included 39 obstructive sleep apnea patients who were recommended for surgical treatment .
METHODS	Patients were randomly divided into two groups : The first group ( DISE plus MM ) underwent a DISE ( 19 patients ) , in addition to the planned procedure according to MM .
METHODS	Meanwhile , the second group ( MM only ) underwent surgery based only on their MM evaluation ( 20 patients ) .
METHODS	Patients with retrolingual-localized obstructions were excluded , whereas patients withthird-degree obstructions at the retropalatal level , according to DISE and/or MM , were included in the study .
RESULTS	There was a significant improvement between pre - and postoperative polysomnography findings in both groups .
RESULTS	However , the postoperative improvements between the groups were not statistically different .
RESULTS	Because there was a significant change in the planned surgical procedures in the first group , there were significantly more combined surgeries followed by the DISE procedure .
CONCLUSIONS	Although the DISE resulted in more changes in the surgical treatment plan and higher rate of combined treatment compared to MM , we determined that this difference did not result in a significant difference in treatment success .
METHODS	4 .

