Application of basic pharmacokinetic concepts to analysis of microdialysis data: illustration with imipenem muscle distribution.

Background: Microdialysis studies of antibacterial tissue distribution in critically ill patients have sometimes led to results that were spectacular but inconsistent with basic pharmacokinetic concepts.

Objective: To conduct a study of imipenem distribution in the muscle of healthy volunteers and critical care patients in order to compare real-life data with theory.

Methods: Microdialysis catheters were placed into the quadriceps, and probe recoveries were determined individually in vivo using a retrodialysis-by-drug method.

Microdialysis study of imipenem distribution in skeletal muscle and lung extracellular fluids of Acinetobacter baumannii-infected rats.

The aim of this study was to investigate imipenem distribution in muscle and lung interstitial fluids of rats with Acinetobacter baumannii pulmonary infection. By combining microdialysis in blood and tissues, it was possible to demonstrate that free imipenem concentrations were virtually identical in blood, muscle, and lung.

Lack of effect of experimental hypovolemia on imipenem muscle distribution in rats assessed by microdialysis.

The aim of this study was to investigate the influence of hypovolemia on the distribution of imipenem in muscle extracellular fluid determined by microdialysis in awake rats. Microdialysis probes were inserted into the jugular vein and hind leg muscle. Imipenem recoveries in muscle and blood were determined in each rat by retrodialysis by drug before drug administration.

Microdialysis study of imipenem distribution in skeletal muscle and lung extracellular fluids of noninfected rats.

The aim of this study was to investigate the imipenem distribution in muscle and lung interstitial fluids by microdialysis in rats and to compare the free concentrations in tissue with the free concentrations in blood. Microdialysis probes were inserted into the jugular vein, hind leg muscle, and lung. Imipenem recoveries in these three media were determined in each rat by retrodialysis by drug period before drug administration.