PubMed ID

7814505

UMMS Affiliation

Department of Medicine, Division of Infectious Diseases and Immunology

Date

10-1-1994

Document Type

Article

Subjects

Chromatography, High Pressure Liquid; Drug Stability; Imipenem; Microbial Sensitivity Tests

Disciplines

Immunology and Infectious Disease

Abstract

We performed a 15-month study using 11 clinical strains and 1 control strain (ATCC 27853) of Pseudomonas aeruginosa to determine whether changes in the manufacturing process of Sensititre predried panels result in a reliable test of susceptibility to imipenem. MIC and breakpoint susceptibility results remained stable during the manufacturer's recommended shelf life of 18 months and compared well with standard agar disk diffusion and broth macrodilution results. Imipenem concentrations measured by high-pressure liquid chromatography were acceptable through 15 months but declined in the breakpoint panels by approximately 50% at 18 months. Between 9 months and panel expiration, 13 of 141 (9%) of the MIC panel packages had moisture entry, as indicated by pink desiccants, with a resultant loss of imipenem activity of 32 to 100%. It appears that the new manufacturing process produces MIC panels that are reliable for imipenem susceptibility testing until the labeled expiration date, provided that packages containing pink desiccants are not used.

Rights and Permissions

Citation: J Clin Microbiol. 1994 Oct;32(10):2584-7.

Related Resources

Link to Article in PubMed