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  • Title: Effect of CYP2D6 genetic polymorphism on peak propafenone concentration: no significant effect of CYP2D6*10.
    Author: Doki K, Shirayama Y, Sekiguchi Y, Aonuma K, Kohda Y, Ieda M, Homma M.
    Journal: Pharmacogenomics; 2020 Dec; 21(18):1279-1288. PubMed ID: 33203295.
    Abstract:
    Aim: The study aims to investigate the clinical implication of nonfunctional poor metabolizer (PM) alleles and intermediate metabolizer (IM) alleles of CYP2D6, including the CYP2D6*10 allele which shows substrate-dependent decrease in enzymatic activity, in antiarrhythmic therapy using propafenone. Materials & methods: We examined serum propafenone concentrations and metabolic ratio, which was expressed as serum concentrations of propafenone to 5-hydroxypropafenone, in 66 Japanese patients with tachyarrhythmias. Results: The peak propafenone concentration and metabolic ratio in CYP2D6 PM allele carriers were higher than those in extensive metabolizer (EM)/EM, EM/IM and IM/IM genotype groups. Conclusion: Results suggest that CYP2D6 PM alleles affect peak propafenone concentration, but the CYP2D6 IM allele CYP2D6*10 has no clinical implication in propafenone dosing.
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