Meropenem administered as a single iv 3 g dose once every 24 h was used to treat nine ambulatory patients with infective exacerbations of bronchiectasis. Serum meropenem concentrations were measured before dosing and at 30 min after each 30 min infusion. Mean pre-dose concentrations were <0.1 mg/L and mean post-dose concentrations 93.9 +/- 29.5 mg/L (95% confidence interval (CI) 86. 2-101.6, n = 59). A pathogen was cultured from sputum in six patients and eradicated (<100 cfu/g sputum) in all but one by day 6 of therapy. Previous work on animals has shown that a bacteriostatic effect is seen with meropenem when t > MIC is greater than 20-30% of the dose interval. In these nine patients, this could be achieved and was associated with successful outcome for pathogens for which MICs are
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