Patients This prospective, non-randomized observational study will be conducted in the Surgical Intensive Care Unit (SICU) at Yale-New Haven Hospital. As this is a pilot study to determine the accuracy and precision of the SonarMed® AirWave™ monitor, the investigators have based our projected enrollment population to complete the study within one year. Intubated patients in the SICU requiring ETT repositioning will be identified by SICU clinicians (attending physicians, residents, respiratory therapists, and registered nurses). Based on manufacturer restrictions, patients with ETTs smaller than 6.5mm and larger than 9mm, double lumen ETTs, and those patients receiving Heliox therapy will be excluded from this study.