Abstract 16248: Comparison of a Non-Invasive Respiratory Volume Monitor to End-Tidal CO2 in Measuring Changes in Minute Ventilation

Introduction: Monitoring respiratory performance is a challenge. Use of secondary indicators like oxygen saturation (SpO2) and capnography (EtCO2) have introduced delay in diagnosis and can produce false alarms. EtCO2 in non-intubated patients has been problematic. We compared performance of an EtCO2 monitor to a respiratory volume monitor (RVM), which provides accurate (error <10%) measurements of minute ventilation (MV), tidal volume & respiratory rate, to assess changes in respiratory status in non-intubated subjects. Methods: Continuous RVM (ExSpiron, Respiratory Motion, Waltham, MA) and capnography data (Capnostream 20, SmartCapnoLine Plus & Filterline Set, Covidien, Mansfield, MA) were collected from 39 subjects. The relationship between EtCO2 & MV for each patient was quantified & EtCO2 sensitivity to MV changes and mean EtCO2 values were compared across the two EtCO2 sampling techniques (paired t-test). Results: A strong negative correlation between MV changes and EtCO2 changes was found (similar ...