Abstract | AIM: METHODS: Seventeen Chinese patients with ventricular premature contractions (VPC> or =1000/d) were recruited. They were normal in routine laboratory testing and administered propafenone hydrochloride 450-600 mg per day in three divided doses. Twelve lead cardiogram and 24 h Holter monitoring were performed before and after 7 d treatment of propafenone. Steady-state peak and trough concentrations of propafenone were measured by HPLC method. CYP2D6*10 genotypes of patients were assayed by polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP). RESULTS: Total inhibitory rate of VPC was 79.9 % in 17 patients with ventricular arrhythmia after propafenone treatment. PR interval prolongation was increased from 0.146 s+/-0.018 s to 0.161 s+/-0.022 s (P<0.05). CYP2D6 genotypes played an important role in plasma levels and effects of propafenone. In 450 mg/d group, patients with homozygous mutant of CYP2D6*10 not only had a Cmax of propafenone two times as high as those of wild-type genotype, but also showed a two fold higher inhibitory rate of VPC compared with those with homozygous CYP2D6*1 (P<0.05). CONCLUSION:
CYP2D6*10 genotype is relevant to decreased activity of CYP2D6 enzyme in Chinese patients. Elevated plasma concentration is consistent with better efficacy of propafenone in patients with ventricular arrhythmia.
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Authors | Wei-Min Cai, Jun Xu, Bing Chen, Fu-Min Zhang, Yuan-Zhu Huang, Yin-Di Zhang |
Journal | Acta pharmacologica Sinica
(Acta Pharmacol Sin)
Vol. 23
Issue 11
Pg. 1040-4
(Nov 2002)
ISSN: 1671-4083 [Print] United States |
PMID | 12421483
(Publication Type: Journal Article)
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Chemical References |
- Anti-Arrhythmia Agents
- Propafenone
- Cytochrome P-450 CYP2D6
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Topics |
- Adult
- Aged
- Anti-Arrhythmia Agents
(blood, pharmacology)
- Arrhythmias, Cardiac
(blood)
- Cytochrome P-450 CYP2D6
(genetics, metabolism)
- Female
- Genotype
- Humans
- Male
- Middle Aged
- Polymerase Chain Reaction
- Polymorphism, Restriction Fragment Length
- Propafenone
(blood, pharmacology)
- Ventricular Premature Complexes
(blood, genetics)
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