Use of Ketamine for Conscious Sedation in Flexible Bronchoscopy

Patients will receive a combination of ketamine and midazolam for conscious sedation

Patients will receive 1mg of midazolam regardless of which arm they are in and my be given 1mg doses for added sedation as needed every 3-5 minutes

Patients randomized to the midazolam and fentanyl arm will receive 25mcg incremental doses for procedural sedation