BACKGROUND: Successful mechanical ventilation requires that the airway be controlled by an endotracheal tube (ETT) with an inflatable cuff to seal the airway. Aeromedical evacuation represents a unique challenge in which to manage ETT cuffs.We evaluated threemethods of automatic ETT cuff pressure adjustment during changes in altitude in an altitude chamber. METHODS: Size 7.5 and 8.0mmETTs that are currently included in the Critical Care Air Transport Teamallowance standard were used for the evaluation. Three automatic cuff pressure controllers-Intellicuff, HamiltonMedical; Pyton, ARMMedical; and Cuff Sentry, Outcome Solutions-were used to manage cuff pressures. The fourth group had cuff pressure set at sea level without further adjustment. Each ETT was inserted into a tracheal model and taken to 8,000 feet and then to 16,000 feet at 2,500 ft/min. Baseline cuff pressure at sea level was approximately 25 cm H2O. RESULTS: Mean cuff pressure at both altitudeswith both size ETTswas as follows: Control arm, 141 ± 64 cmH2O; Pyton, 25 ± 0.8 cm H2O; Cuff Sentry, 22 ± 0.3 cm H2O; and Intellicuff, 29 ± 6.6 cm H2O. The mean time that cuff pressure was <30 cm H2O using Intellicuff at both altitudes was 2.8 ± 0.8 minutes. Pressure differences from baseline in the control arm and with Intellicuff were statistically significant. Cuff pressure with the Cuff Sentry tended to be lower than indicated on the device. CONCLUSIONS: Mean cuff pressures were within the recommended range with all three devices. Intellicuff had difficulty regulating the cuff pressure initially with increases in altitude but was able to reduce the pressure to a safe level during the stabilization period at each altitude. The Pyton and Cuff Sentry allowed the least variation in pressure throughout the evaluation, although the Cuff Sentry set pressure was less than the actual pressure. (J Trauma Acute Care Surg. 2016;81: S116-S120.