Synthesis of Results
Of the 20 studies, only one directly compared three kinds of treatments of RRP,and two studies compared microdebrider to CO2 laser treatment of RRP, analyzing the complications tape and complication rate between the two treatment settings. The remaining 17 studies analyzed the outcome measures in one of the three treatment modalities only. In the study which compared three kinds of treatments, patients in the KTP laser group had been treated in the hospital multiple times prior to inclusion in the study, and calculating postoperative complication rate data on this basis was unreliable and therefore excluded from the KTP group study. Overall, 14 studies were CO2 laser treatment, while 6 studies were microdebrider treatment, and 5 studies assessed KTP laser. There are 161 patients with RRP were treated by microdebrider, a total of 605 patients with RRP were treated by CO2 laser, while a total of 106 were treated by KTP laser.