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. 1995 Jun;115(3):503–509. doi: 10.1111/j.1476-5381.1995.tb16362.x

The use of microdialysis for the study of drug kinetics: some methodological considerations illustrated with antipyrine in rat frontal cortex.

P N Patsalos 1, W T Abed 1, M S Alavijeh 1, M T O'Connell 1
PMCID: PMC1908406  PMID: 7582464

Abstract

1. The neuropharmacokinetics of antipyrine, a readily dialysable drug, in rat frontal cortex were studied and the effect of sampling time and contribution of period sampling and dialysate dead volume investigated in relation to tmax, Cmax, AUC and t1/2 values. 2. After i.p. administration, antipyrine (35 mg kg-1, n = 5) concentrations rose rapidly in rat frontal cortex (tmax, 12 min) and then declined exponentially tmax, Cmax, AUC and t1/2 values were determined after 2 min dialysate sampling and compared to values obtained from simulated sampling times of 4, 6, 8, 10 and 20 min. 3. Antipyrine tmax and Cmax values were directly dependent on sampling frequency. Thus, mean 2 min sampling tmax and Cmax values were 63% lower and 27% higher, respectively, compared to 20 min sampling values. AUC and t1/2 values were unaffected. 4. Adjustment for dialysate dead volume (the volume of dialysate within the dialysis probe and sampling tube) reduced tmax values significantly but did not affect the other neuropharmacokinetic parameters. 5. Contribution of period sampling on neuropharmacokinetic parameters were investigated by comparing plots of antipyrine concentration data at midpoint and at endpoint of sampling time interval. Only tmax values were affected with values decreasing with increasing sampling time interval. 6. In conclusion, although microdialysis is a useful method for monitoring events at the extracellular level and for kinetic studies, it is important to understand its inherent characteristics so that data can be interpreted appropriately. Sampling frequency, particularly during monitoring of periods of rapid change, is very important since Cmax and tmax values will be significantly underestimated and overestimated respectively, if sampling time is longer rather than shorter.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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