Utilidad de la escala de severidad modificada CRB75 en el manejo del paciente anciano con neumonía adquirida en la comunidad

Abstract

ObjectiveTo compare the ability of the classic CRB65 (confusion, respiratory rate, blood pressure and age ≥65 years) vs the modified CRB-75 for the severity assessment of patients 65 years or older with community acquired pneumonia (CAP). DesignProspective cohort study. SettingTarragona Health Region. ParticipantsA total of 350 patients ≥65 years with a radiographically confirmed CAP (hospitalized or outpatient) during 2008-2010. Main outcome measuresThe CRB-65 score (confusion; respiratory rate ≥30; systolic blood pressure<90mmHg or diastolic ≤ 60mmHg; age ≥65 years) and the modified CRB-75 (similar criteria but age ≥75 years) were calculated at the time of diagnosis, and 30-day mortality was considered as the main dependent variable. ResultsThe overall 30-day mortality rate was 13.1% (4% in outpatient CAP and 15% in hospitalized CAP). According to CRB-65, mortality was 7,7% with a score of 1, 22.5% with a score of 2, and 50% with a score of 3 (no cases with a score of 4). Mortality also directly increased according to CRB-75, being 3,2% with a score of 0, 9,7% with a score of 1, 30.0% with a score of 2, and 45.5% with a score of 3. The discriminative value of both CRB65 and CRB75 rules to classify risk of short-term mortality among our study population was acceptable, with a better area under receive operating characteristic curve (ROC) for CRB75 than for CRB-65 (0,735 vs 0,681; P<.01). ConclusionBoth CRB-65 and CRB-75 scales are an acceptable tool to classify mortality risk among elderly patients with CAP. However, CRB-75 can be more useful for evaluating patients over 65 years with CAP.