3.6. Complications rates
The complications rates were 2.32% (2 of 86) in the KTP group and 17.71% (88 of 497) in the CO2 group (Table 3). The complications rates were significantly different between the two groups (p<0.0001). In the KTP group, only two complications were reported that webbing was formed in front of the vocal fissure, causing hoarseness but did not affect breathing44. As for CO2 laser, a great number of complications occurred, including mucosal tears, tooth injuries, laryngeal edema, scarring, stenosis, and web formation (most were anterior glottic web), and delayed soft tissue complications (i.e. functionally debilitating scar formation with consecutive voice disorders or airway stenosis)1,12,38,40–42. These complications relied on the invasiveness of papilloma, the instrumentation used during surgery, and the experience of the surgeon12.