Three cases of drug-induced thrombocytopenic purpura are described: One due to quinine, one to quinidine, and the third to diphenylhydantoin (Dilantin). The first 2 recovered promptly following omission of the offending drug, and administration of steroid therapy. The one due to diphenylhydantoin manifested also a severe granulocytopenia, fever and a maculopapular rash, thus suggesting multiple consequences of allergic manifestations referable to the same drug. In all 3 subjects the identity of the thrombocytopenia-inducing drug was established by clot-retraction studies. In order to apply the method during the thrombocytopenic phase of the disease, when the offending drug might still be circulating, and thus when the patient's clot might not retract, the following modification was used: freshly drawn normal blood was admixed with small amounts of the patient's serum and suspected drug, concurrent with appropriate controls.
Weintraub RM, Pechet L, Alexander B, Gode A. Rapid Diagnosis of Drug-Induced Thrombocytopenic Purpura: Report of Three Cases Due to Quinine, Quinidine, and Dilantin. JAMA. 1962;180(7):528–532. doi:10.1001/jama.1962.03050200012004
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