%0 Journal Article %A Soheil Peiman %A Hamidreza Abtahi %A Zeynab Yassin %T Significance of first arterial carbon dioxide pressure in patients hospitalized with community acquired pneumonia %D 2014 %J European Respiratory Journal %P P2578 %V 44 %N Suppl 58 %X Introduction: Despite high incidence of community acquired pneumonia (CAP), there is little data about significance of the arterial carbon dioxide pressure (PaCO2) in prediction of CAP prognosis. This study prospectively evaluated the outcome of hospital admitted CAP based on the first PaCO2.Method: From April 2013 to January 2014, CAP patients that admitted in a tertiary university hospital entered in the study. The relation between the first PaCO2 group (<35, 35-45 and >45) and CURB-65 obtained in emergency ward with duration of hospitalization (< 2weeks, >2weeKs), ICU admission and mortality within 28 days in these patients were analyzed by Mann-Whitney test.Results: Seventy five patients (mean Age: 59.8±17.9; Male: 42/75) were included. The frequencies of ICU admission and mortality were 21% and 8% respectively. Mean values for PaCO2, and duration of hospitalization were 41.01±12.8 mmHg, and 13.1±11.8 days respectively. Although PaCO2 had week correlation with duration of hospitalization (r: 0.361; P: 0.004), the relation between PaCO2 with duration of hospitalization, ICU admission, and mortality was not significant (P: 0.708, 0.437, and 0.412 respectively). CURB-65 had significant correlation to duration of hospitalization, ICU admission and mortality (P: 0.01, 0.005 and 0.002 respectively).Conclusion: First PaCO2 level during hospitalization could not be used as a predictor in hospitalized CAP patients. In contrast, CURB-65 is a reliable predictor of outcome in these patients. %U