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The influence of uremia on the accessibility of phosphomycin into interstitial tissue fluid
Abstract:
The entry and persistence of phosphomycin in interstitial tissue fluid (ITF) were studied in 9 patients with normal renal function and 8 patients with varying degrees of renal impairment, all of whom received a single i.v. dose of 30 mg/kg. ITF was obtained from skin blisters produced by suction. The antibiotic followed a two-compartment open kinetic model. In patients with normal renal function, phosphomycin is incorporated rapidly into the ITF reaching a level of 60.4 micrograms/ml 60 min after administration. There was no statistically significant difference between the elimination rates from serum and ITF. The serum half-life of the slow disposition phase was 1.75 h in patients with normal renal function. There was a linear correlation between the elimination half-life of phosphomycin in serum and ITF in subjects with differing degrees of renal impairment.
Insights
Phosphomycin rapidly enters interstitial tissue fluid (ITF), with elimination rates similar to serum. Renal impairment shows a linear correlation with phosphomycin
Area of Science:
- Pharmacokinetics
- Antibiotic Distribution
- Renal Function Studies
Background:
- Understanding antibiotic distribution in interstitial tissue fluid (ITF) is crucial for optimizing therapeutic efficacy.
- Phosphomycin is a widely used antibiotic, but its penetration into deep tissues requires further investigation.
Purpose of the Study:
- To investigate the entry and persistence of phosphomycin in interstitial tissue fluid (ITF).
- To evaluate the pharmacokinetic profile of phosphomycin in patients with normal and impaired renal function.
Main Methods:
- Single intravenous dose of 30 mg/kg phosphomycin administered to patients.
- Interstitial tissue fluid (ITF) collected via suction-induced skin blisters.
- Analysis of phosphomycin concentrations in serum and ITF using a two-compartment open kinetic model.
Main Results:
- Phosphomycin rapidly distributes into ITF, reaching 60.4 µg/ml at 60 minutes in healthy subjects.
- No significant difference was observed in elimination rates between serum and ITF.
- A linear correlation was found between serum and ITF elimination half-lives in patients with renal impairment.
Conclusions:
- Phosphomycin exhibits favorable penetration into interstitial tissue fluid.
- The elimination of phosphomycin from ITF mirrors serum elimination.
- Renal function significantly influences phosphomycin's elimination half-life in both serum and ITF.