Data will be collected at baseline as soon as the patient is enrolled in the study. It will include: demographic variables, medical record number, age, race, gender; history and physical findings, other medical conditions, vital signs, oxygen saturation at baseline, CAS, peak flow in children >6 years of age, asthma severity prior to admission, NPPV settings, length of stay in the PICU, side effect profiles (tremor, tachycardia, agitation, nausea, nasal bridge pain, skin irritation/ulceration, gastric distension, dry eyes/mucosal dryness, sinus/ear pain, aspiration pneumonia, hypotension and pneumothorax).