[Use of azlocillin in the treatment of Pseudomonas bronchopulmonary infections].

Eleven patients with severe bronchopulmonary infection due to Pseudomonas were treated with azlocillin in doses of 250 mg/kg/day. Severe preexisting respiratory diseases, such as bronchopulmonary carcinoma, bronchiectasis or respiratory insufficiency were present in all cases. All patients had been unsuccessfully treated with various antibiotics before they received azlocillin. The pathogenicity of the isolates was assessed by germ counts in sputum. Comparative in vitro sensitivities to carbenicillin and azlocillin were determined by the disc method and by measurement of the minimum inhibitory concentrations in liquid medium. All strains of Pseudomonas aeruginosa isolated were sensitive to azlocillin with minimum inhibitory concentrations of 0.5 to 64 micrograms/ml. When tested against carbenicillin, 4 of the strains were resistant and 1 had intermediate sensitivity. The carbenicillin/azlocillin minimum inhibitory concentrations ratio was usually equal to 4. Clinical results were satisfactory in 7 cases; inadequate response or failure was observed in 4 cases and attributed to the replacement of Pseudomonas by another pathogen (Proteus morganii or Klebsiella pneumoniae). This study suggests that azlocillin is of value in the treatment of bronchopulmonary infections caused by Ps. aeruginosa.