Lee HJ, Woo JH, Cho S, et al. - In this single-center-based retrospective study, researchers ascertained if an upper respiratory tract infection (URI) symptom-free period and other risk factors affect the incidence of perioperative respiratory adverse events (RAEs). The sample consisted of 267 pediatric patients (aged 0 to 13 years) with a recent URI episode who underwent surgery under general anesthesia. In 23 of 267 patients (8.6%), RAEs occurred. Univariate analysis showed that abnormal preoperative chest images and emergency operations were correlated with RAEs. Procedures should be performed after a URI symptom-free period of at least 1– 2 weeks for pediatric patients who need surgery and have a recent history of URI. Confirming the absence of abnormalities will decrease the occurrence of perioperative RAEs in preoperative chest images.