Summary
The aims of this study were to evaluate the oxidising phenotype in a random sample of the Italian population and to study the relationships between the phenotype and the pharmacokinetics of propafenone, which is oxidised to 5-hydroxypropafenone.
The urinary debrisoquine: 4-hydroxydebrisoquine ratio was used to characterise the oxidative phenotype in 90 subjects (42 patients with ventricular arrhythmias and 48 healthy volunteers); subjects with ratios higher than 12.6 were defined ‘poor metabolisers’. The pharmacokinetics of propafenone were studied in 10 ‘extensive metabolisers’ of debrisoquine, both after acute and maintenance administration.
The incidence of ‘poor metabolisers’ was 6.6%, similar to that of other studies in Caucasians. Propafenone exibited nonlinear kinetics; the propafenone: 5-hydroxypropafenone ratio and the propafenone half-life were significantly related to the debrisoquine: 4-hydroxydebrisoquine ratio, both after single dose (r = 0.97; r = 0.96, respectively) and maintenance administration (r = 0.99; r = 0.95).
In conclusion, the differences in oxidising capacity observed among ‘extensive me-tabolisers’ markedly influence the kinetics of propafenone with relevant clinical implications.
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Boriarti, G., Strocchi, E., Capucci, A. et al. Relationships Between Debrisoquine Hydroxylation and Propafenone Pharmacokinetics. Drug Invest 2, 114–119 (1990). https://doi.org/10.1007/BF03258249
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DOI: https://doi.org/10.1007/BF03258249