Observation of Atelectasis Using Lung Ultrasonography in Children Undergoing General Anesthesia: the Cohort Study for Evaluation of the Relationship Between the Incidence and Severity of Upper Respiratory Tract Infection and the Magnitude of Anesthesia-induced Atelectasis

Before the operation, the researcher interviews the parents of the pediatric patients to check whether they have the upper respiratory tract infection and asks them to fill out a questionnaire about the severity of their symptoms. The questionnaire consists of 8 types of symptom about upper respiratory infections and each symptom was checked from 0 to 3 according to severity by their patients.