PMID: 2508586Oct 1, 1989Paper

Evaluation of intravenous ciprofloxacin in patients with nosocomial lower respiratory tract infections. Impact of plasma concentrations, organism, minimum inhibitory concentration, and clinical condition on bacterial eradication

Archives of Internal Medicine
C A PeloquinJ J Schentag

Abstract

Fifty patients with gram-negative lower respiratory tract infections were treated with intravenous ciprofloxacin to evaluate efficacy and safety. Relationships between individual pharmacokinetics and clinical and bacteriologic outcome were studied. Ciprofloxacin concentrations in plasma were determined by high-performance liquid chromatography. Respiratory secretion cultures were obtained daily to determine the eradication day of the infecting organism. Susceptibility (minimum inhibitory concentration) to ciprofloxacin and other antimicrobials was determined using standard microdilution techniques. The mean age of the patients was 70 years. They had multiple underlying diseases, and two thirds of them were ventilator dependent at entry. Approximately 50% of the patients had failed previous treatment for the same infections. Patients infected with Enterobacteriaceae or Haemophilus influenzae with minimum inhibitory concentrations of less than 0.25 mg/L responded well to intravenous ciprofloxacin therapy (200 mg every 12 hours). The organisms were eradicated from sputum cultures usually within 1 day after ciprofloxacin therapy was started. Most clinical failures occurred in patients who were infected with Pseudomonas aeruginosa a...Continue Reading

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