Once the required distance for ETT repositioning is prescribed, the respiratory therapist will move the ETT based on the positioning at the incisors. This is standard practice. The device readings will be recorded pre- and post-repositioning. The therapist will be blinded to the device readings. The readings taken from the AirWave monitor are for research purposes only, and will not be considered when making clinical care decisions. Following repositioning, it is standard practice to obtain a follow up chest X-ray for confirmation of tube position within a two hour window. The same head positioning, noted on the original X-ray, will be maintained for the follow up X-ray. Device readings will also be taken at the time of the follow up X-ray. If the tube is to be further repositioned based on the decisions of the SICU team the device will be left in place until such time as the tube position has been fully optimized by the SICU team.