Early microbiological response to linezolid vs vancomycin in ventilator-associated pneumonia due to methicillin-resistant Staphylococcus aureus

Chest
Richard G WunderinkJoseph S Solomkin

Abstract

Methicillin-resistant Staphylococcus aureus (MRSA) is a common cause of ventilator-associated pneumonia (VAP). This prospective, open-label, multicenter clinical trial compared the early microbiological efficacy of linezolid (LZD) therapy with that of vancomycin (VAN) therapy in patients with MRSA VAP. A total of 149 patients with suspected MRSA VAP were randomized to receive either LZD, 600 mg, or VAN, 1 g every 12 h. Patients with baseline bronchoscopic BAL (BBAL) fluid quantitative culture findings that were positive for MRSA (>or= 10(4) cfu/mL) comprised the study population. The primary outcome was microbiological response (<or= 10(2) cfu/mL) in a second BBAL performed 72 to 96 h following the start of treatment. Thirty LZD-treated patients and 20 VAN-treated patients had microbiologically confirmed MRSA at baseline; 23 and 19 patients, respectively, underwent repeat BBAL. While a greater number of LZD-treated patients than VAN-treated patients achieved a microbiological cure (56.5% vs 47.4%, respectively; p = 0.757; 95% confidence interval, -21.1 to 39.4), this difference was not statistically significant. Nonstatistically significant differences were also seen for LZD-treated patients vs VAN-treated patients in terms of ...Continue Reading

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