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J Antimicrob Chemother. 1985 Jan;15 Suppl A:169-73.

Computer-controlled in-vitro simulation of multiple dosing regimens.


The bactericidal effect of gentamicin on Pseudomonas aeruginosa ATCC 27853 was investigated in a computer controlled dynamic in-vitro model, which allows the simultaneous simulation of three different dosing regimens for several days. The same total dose reduced cfu-counts of Pseudomonas aeruginosa most effectively, when administered with peak concentrations of 32 mg/l every 32 h, whereas the other dosing regimens with peak concentrations of 16 mg/l every 16 h and 8 mg/l every 8 h were distinctly less effective following the second and subsequent doses. It was shown that the use of a microcomputer facilitates the in-vitro investigation of multiple dosing regimens but counting of cfu cannot be substituted by automatic measurements of turbidity when rapid bactericidal effects occur.

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