ISSN:
1432-1440
Keywords:
Polymorphic drug oxidation
;
Metoprolol
;
Propafenone
;
Diltiazem
;
Sparteine
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary A 47-year-old patient suffering from coronary artery disease was admitted to the CCU in shock with IIIo AV block, severe hypotension, and impairment of ventricular function. One week prior to admission a therapy with standard doses of metoprolol (100 mg t.i.d. and then 100 mg b.i.d.) had been initiated. Two days before admission diltiazem (60 mg b.i.d.) was prescribed in addition. Analyses of a blood sample revealed unusually high plasma concentrations of metoprolol (〉 3000 ng/ml) and diltiazem (526 ng/ml). The patient recovered within 1 week following discontinuation of antianginal therapy. Three months later the patient was exposed to a single dose of metoprolol, diltiazem, propafenone (since he had received this drug in the past), and sparteine (as a probe for the debrisoquine/sparteine type polymorphism of oxidative drug metabolism). It was found that he was a poor metabolizer of all four drugs, indicating that their metabolism is under the same genetic control. Therefore, patients belonging to the poor-metabolizer phenotype of sparteine/debrisoquine polymorphism in drug metabolism, which constitutes 6.4% of the German population, may experience adverse drug reactions when treated with standard doses of one of these drugs alone. Moreover, the coadministration of these frequently used drugs is expected to be especially harmful in this subgroup of patients.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01733250
