3.3 Risk factors for clinical complications after ST
Table 4 summarizes the characteristics of patients with or without complications. Among the 49 patients (17%) who developed complications within 7 days after ST, 11 (4%) had bleeding, 29 (10%) had infection, and 16 (3%) had subcutaneous emphysema. ST under local anesthesia and ST for airway emergency significantly increased the risk of complications after ST (p = 0.01 and p = 0.02, respectively). Among the complications, subcutaneous emphysema was significantly more frequent in ST under local anesthesia (p < 0.001) and under airway emergency (p = 0.049) (Table 5).