Plasma vs heart tissue concentration in humans - literature data analysis of drugs distribution

Biopharmaceutics & Drug Disposition
Zofia Tylutki, Sebastian Polak

Abstract

Little is known about the uptake of drugs into the human heart, although it is of great importance nowadays, when science desires to predict tissue level behavior rather than to measure it. Although the drug concentration in cardiac tissue seems a better predictor for physiological and electrophysiological changes than its level in plasma, knowledge of this value is very limited. Tissue to plasma partition coefficients (Kp) come to rescue since they characterize the distribution of a drug among tissues as being one of the input parameters in physiologically based pharmacokinetic (PBPK) models. The article reviews cardiac surgery and forensic medical studies to provide a reference for drug concentrations in human cardiac tissue. Firstly, the focus is on whether a drug penetrates into heart tissue at a therapeutic level; the provided values refer to antibiotics, antifungals and anticancer drugs. Drugs that directly affect cardiomyocyte electrophysiology are another group of interest. Measured levels of amiodarone, digoxin, perhexiline and verapamil in different sites in human cardiac tissue where the compounds might meet ion channels, gives an insight into how these more lipophilic drugs penetrate the heart. Much data are derived...Continue Reading

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Citations

Jul 28, 2016·Expert Opinion on Therapeutic Patents·Christopher H GeorgeZaheer Yousef
Apr 11, 2019·Drug Metabolism and Disposition : the Biological Fate of Chemicals·Elizabeth A HausnerXi Yang

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