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  • Title: [Nebulized colistin treatment of multi-resistant Acinetobacter baumannii pulmonary infection in critical ill patients].
    Author: Pérez-Pedrero MJ, Sánchez-Casado M, Rodríguez-Villar S.
    Journal: Med Intensiva; 2011 May; 35(4):226-31. PubMed ID: 21396739.
    Abstract:
    OBJECTIVE: To analyze the efficacy of nebulized colistin in the microbiological eradication and clinical improvement of patients with pulmonary infection by multi-resistant Acinetobacter baumannii (MAB). DESIGN: A retrospective study. SETTING: Intensive Care Unit of a Tertiary hospital. PATIENTS: Hospitalized patients on invasive mechanical ventilation with positive MAB cultures of the airway. INTERVENTIONS: All received treatment with colistin (CL). Nosocomial pneumonia (NP) or Tracheobronchitis (TB) was determined according to routine criteria and colonization (CO) was determined in the case of a positive culture in the absence of infection criteria. Three groups of patients were defined: those treated with nebulized CL, those treated with IV CL and those treated with IV CL plus nebulized CL. MAIN MEASUREMENTS: Baseline characteristics. Microbiological eradication and clinical recovery were evaluated according to routine criteria. RESULTS: 83 patients were studied, 54 of whom were treated, with the following diagnoses: 15 (27.8%) with NP, 16 (29.6%) with TB and 23 patients (42.6%) with CO. Nebulized CL was used in 36 patients (66.7%): 66.7% of which for CO, 33.3% in treatment for TB and in no case of NP. In 61.1% of the patients, IV CL was used: 22.2% of which for CO, 38.9% for TB and 38.9% in NP. The combination of IV CL and nebulized CL was used in 15 patients (27.8%): 5 patients (33.3%) CO, 2 patients (13.3%) TB and 8 patients (53.3%) NP. Microbiological eradication was achieved in 32 patients (59.3%), with the following distribution: 8 (47.1%) with IV CL, 15 (83.3%) with nebulized CL and 9 patients (69.2%) with a combination of IV CL and nebulized CL. Clinical recovery was achieved in 42 patients (77.8%): 12 (80%) with IV CL, 18 (94.7%) with nebulized CL and 12 (85.7%) with a combination of nebulized and IV CL. These differences were not significant. In the group of patients with infection due to TB and NP (31 patients, 57.4%), microbiological eradication was achieved in 5 patients (100%) treated with nebulized CL and in 6 of the 9 patients (42.9%) treated with IV CL, the difference being significant (P<.05). Clinical recovery in this group was 100% (6 patients) treated with nebulized CL and 75% (9 of the 12 patients) in the IV CL group. This difference was not significant. CONCLUSIONS: Our study suggests that treatment with colistin in patients with pulmonary infection with multi-resistant Acinetobacter baumannii could be more efficient if it were to be administrated solely nebulized or in combination with IV colistin rather than administered solely intravenously.
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