Comparative Evaluation of smART+ REE Module to an FDA-cleared Device, for REE Calculation in ICU Patients

Inclusion Criteria: * Males and females 22 years or older * Patient has already been admitted to ICU * Patient expected to be ventilated at least 24 hours after enrollment * Patients should be stable hemodynamically (no increase/decrease in vasopressors) and respiratory (no change in mechanical ventilation settings) for at least 1 hour prior to initiation of study procedures. Exclusion Criteria: * Women who are pregnant * Patient requiring chest drainage