Children with certain lung conditions undergo pulmonary function tests (PFT) which are currently being performed using chloral hydrate administered by the responsible and sedation credentialed pulmonologist (Dr. Lawrence Rhein). Chloral hydrate is inconsistent and unreliable in producing adequate sedation for a successful PFT study. Sedation physicians from the BCH Department of Anesthesia have agreed to provide sedation for these patients with dexmedetomidine (DEX), using the same approved protocols that are being used in the BCH Department of Radiology for non-painful imaging studies.