Patterns of c-reactive protein RATIO response in severe community-acquired pneumonia: a cohort study.

INTRODUCTION: Community-acquired pneumonia (CAP) requiring intensive care unit (ICU) admission remains a severe medical condition, presenting ICU mortality rates reaching 30%. The aim of this study was to assess the value of different patterns of C-reactive protein (CRP)-ratio response to antibiotic therapy in patients with severe CAP requiring ICU admission as an early maker of outcome. METHODS: In total, 191 patients with severe CAP were prospectively included and CRP was sampled every other day from D1 to D7 of antibiotic prescription. CRP-ratio was calculated in relation to D1 CRP concentration. Patients were classified according to an individual pattern of CRP-ratio response with the following criteria: fast response - when D5 CRP was less than or equal to 0.4 of D1 CRP concentration; slow response - when D5 CRP was > 0.4 and D7 less than or equal to 0.8 of D1 CRP concentration; nonresponse - when D7 CRP was > 0.8 of D1 CRP concentration. Comparison between ICU survivors and non-survivors was performed. RESULTS: CRP-ratio from D1 to D7 decreased faster in survivors than in non-survivors (p = 0.01). The ability of CRP-ratio by D5 to predict ICU outcome assessed by the area under the ROC curve was 0.73 (95% Confidence Interval, 0.64 - 0.82). By D5, a CRP concentration above 0.5 of the initial level was a marker of poor outcome (sensitivity 0.81, specificity 0.58, positive likelihood ratio 1.93, negative likelihood ratio 0.33). The time-dependent analysis of CRP-ratio of the three patterns (fast response n = 66; slow response n = 81; nonresponse n = 44) was significantly different between groups (p < 0.001). The ICU mortality rate was considerably different according to the patterns of CRP-ratio response: fast response 4.8%, slow response 17.3% and nonresponse 36.4% (p < 0.001). CONCLUSIONS: In severe CAP, sequential evaluation of CRP-ratio was useful in the early identification of patients with poor outcome. The evaluation of CRP-ratio pattern of response to antibiotics during the first week of therapy was useful in the recognition of the individual clinical evolution.

Impact of systemic corticosteroids on the clinical course and outcomes of patients with severe community-acquired pneumonia: a cohort study.

INTRODUCTION: Our aim was to evaluate the impact of corticosteroids on clinical course and outcomes of patients with severe community-acquired pneumonia (CAP) requiring invasive mechanical ventilation. METHODS: This was a cohort study of patients with severe CAP from 2 intensive care units in tertiary hospitals in Brazil and Portugal. RESULTS: A total of 111 patients were included (median age, 69 years; 56% men; 34% hospital mortality). Corticosteroids were prescribed in 61 (55%) patients. Main indications for their use were bronchospasm (52.5%) and septic shock (36%). Mortality rate of patients treated with and without corticosteroids was comparable (29.5% vs 32%, P = .837). No significant differences were observed on clinical course from day 1 to day 7 as assessed by the Sequential Organ Failure Assessment score (P = .95). Furthermore, C-reactive protein declined similarly in both groups (P = .147). In a multivariate analysis, mortality was associated with older age and higher Acute Physiology and Chronic Health Evaluation II score. CONCLUSIONS: In patients with severe CAP requiring invasive mechanical ventilation, adjunctive therapy with corticosteroids did not influence intensive care unit and hospital mortality. In addition, no changes were observed on weaning from vasopressors, on recovery from organ failure/dysfunction as assessed by the Sequential Organ Failure Assessment score, as well as on C-reactive protein course.