期刊
CRITICAL CARE MEDICINE
卷 41, 期 9, 页码 2133-2143出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/CCM.0b013e31828a453b
关键词
ICU; lung; microbiology; nosocomial infection; ventilator-associated pneumonia
资金
- European Respiratory Society
- Covidien Ltd.
- Zambon
- Chiesi
- Pfizer
- GSK
- Thermofisher
- Abbott
- Centro de Investigacion Biomedica en Red-Enfermedades Respiratorias-Instituto de Salud Carlos III (ISCiii) [CibeRes CB06/06/0028, 2009 SGR 911]
- Institut d'Investigacions Biomediques August Pi I Sunyer (IDIBAPS)
- ERS Fellowship
Objectives: The impact of ICU-acquired pneumonia without etiologic diagnosis on patients' outcomes is largely unknown. We compared the clinical characteristics, inflammatory response, and outcomes between patients with and without microbiologically confirmed ICU-acquired pneumonia. Design: Prospective observational study. Setting: ICUs of a university teaching hospital. Patients: We prospectively collected 270 consecutive patients with ICU-acquired pneumonia. Patients were clustered according to positive or negative microbiologic results. Interventions: None. Measurements and Main Results: We compared the characteristics and outcomes between both groups. Negative microbiology was found in 82 patients (30%). Both groups had similar baseline severity scores. Patients with negative microbiology presented more frequently chronic renal failure (15 [18%] vs 11 [6%]; p = 0.003), chronic heart disorders (35 [43%] vs 55 [29%]; p = 0.044), less frequently previous intubation (44 [54%] vs 135 [72%]; p = 0.006), more severe hypoxemia (Pao(2)/Fio(2) : 165 +/- 73 mm Hg vs 199 +/- 79 mm Hg; p = 0.001), and shorter ICU stay before the onset of pneumonia (5 +/- 5 days vs 7 +/- 9 days; p = 0.001) compared with patients with positive microbiology. The systemic inflammatory response was similar between both groups. Negative microbiology resulted in less changes of empiric treatment (33 [40%] vs 112 [60%]; p = 0.005) and shorter total duration of antimicrobials (13 +/- 6 days vs 17 +/- 12 days; p = 0.006) than positive microbiology. Following adjustment for potential confounders, patients with positive microbiology had higher hospital mortality (adjusted odds ratio 2.96, 95% confidence interval 1.24-7.04, p = 0.014) and lower 90-day survival (adjusted hazard ratio 0.50, 95% confidence interval 0.27-0.94, p = 0.031), with a nonsignificant lower 28-day survival. Conclusions: Although the possible influence of previous intubation in mortality of both groups is not completely discarded, negative microbiologic findings in clinically suspected ICU-acquired pneumonia are associated with less frequent previous intubation, shorter duration of antimicrobial treatment, and better survival. Future studies should corroborate the presence of pneumonia in patients with suspected ICU-acquired pneumonia and negative microbiology.
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