Agranulocytosis during combined procainamide and phenytoin therapy. 1979

J E Crook, and R L Woosley, and R B Leftwich, and E A Natelson

We have presented two cases of agranulocytosis occurring in patients receiving a combination antiarrhythmic regimen. As multiple drug therapy for ventricular arrhythmias becomes more commonplace, increased scrutiny should be given to agents chosen, in an effort to prevent any possible adverse interactions. When future cases are encountered, the acetylator pheontype should be determined. This information would aid in assessing the predicative value of the acetylator phenotype in the development of agranulocytosis. Due to the inherent danger, neither patient was rechallenged with procainamide nor phenytoin.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010641 Phenotype The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment. Phenotypes
D010672 Phenytoin An anticonvulsant that is used to treat a wide variety of seizures. It is also an anti-arrhythmic and a muscle relaxant. The mechanism of therapeutic action is not clear, although several cellular actions have been described including effects on ion channels, active transport, and general membrane stabilization. The mechanism of its muscle relaxant effect appears to involve a reduction in the sensitivity of muscle spindles to stretch. Phenytoin has been proposed for several other therapeutic uses, but its use has been limited by its many adverse effects and interactions with other drugs. Diphenylhydantoin,Fenitoin,Phenhydan,5,5-Diphenylhydantoin,5,5-diphenylimidazolidine-2,4-dione,Antisacer,Difenin,Dihydan,Dilantin,Epamin,Epanutin,Hydantol,Phenytoin Sodium,Sodium Diphenylhydantoinate,Diphenylhydantoinate, Sodium
D011342 Procainamide A class Ia antiarrhythmic drug that is structurally-related to PROCAINE. Procaine Amide,Apo-Procainamide,Biocoryl,Novocainamide,Novocamid,Procainamide Hydrochloride,Procamide,Procan,Procan SR,Procanbid,Pronestyl,Rhythmin,Amide, Procaine,Hydrochloride, Procainamide
D004359 Drug Therapy, Combination Therapy with two or more separate preparations given for a combined effect. Combination Chemotherapy,Polychemotherapy,Chemotherapy, Combination,Combination Drug Therapy,Drug Polytherapy,Therapy, Combination Drug,Chemotherapies, Combination,Combination Chemotherapies,Combination Drug Therapies,Drug Polytherapies,Drug Therapies, Combination,Polychemotherapies,Polytherapies, Drug,Polytherapy, Drug,Therapies, Combination Drug
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000107 Acetylation Formation of an acetyl derivative. (Stedman, 25th ed) Acetylations
D000123 Acetyltransferases Enzymes catalyzing the transfer of an acetyl group, usually from acetyl coenzyme A, to another compound. EC 2.3.1. Acetyltransferase

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