<qa>  What is the purpose of this proposal?The purpose of this proposal is to explore the relationships between End Tidal Carbon Dioxide ETCO2 via nasal cannula ETCO2-NC and routinely measured physiologic and participant reported parameters in extubated participants who have received a continuous flow left ventricular assist device CF-LVAD, and to determine if the addition of ETCO2-NC monitoring to usual care is associated with decreased incidence and severity of respiratory issues. 