A 3-year-old toddler who weighs 15kg is undergoing a Nissen…

A 3-year-old toddler who weighs 15kg is undergoing a Nissen fundoplication surgery under general anesthesia with an endotracheal tube. After emergence and tracheal extubation, the patient has the following symptoms: inspiratory wheezing, barking cough and inspiratory dyspnea. What is the MOST appropriate treatment at this time?