Nursing / Carbon Dioxide / Asthma / Treatment Outcome / Critical Care / Critical Care Medicine / Humans / Female / Male / Clinical Sciences / Aged / Middle Aged / Public health systems and services research / Intensive Care Units / Hypercapnia / Pulmonary Gas Exchange / Critical Care Medicine / Humans / Female / Male / Clinical Sciences / Aged / Middle Aged / Public health systems and services research / Intensive Care Units / Hypercapnia / Pulmonary Gas Exchange