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Cefotetan-induced immunologic thrombocytopenia
D J Christie1, S S Lennon, R L Drew
1Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis 55455.
British Journal of Haematology
|December 1, 1988
Summary
This study reports the first definitive case of cefotetan-induced immunologic thrombocytopenia. An elderly patient developed severe bleeding due to cefotetan-dependent anti-platelet antibodies during surgery.
Area of Science:
- Immunology
- Hematology
- Pharmacology
Background:
- Antibiotic-induced thrombocytopenia is a rare but serious adverse effect.
- Cephalosporins and penicillins are known to cause immune-mediated platelet destruction.
Observation:
- An elderly female patient developed profound thrombocytopenia and coagulopathy during surgery for a perforated gastric ulcer while on cefotetan.
- Laboratory tests revealed severe bleeding diathesis with significantly prolonged prothrombin time and PTT.
- Cefotetan-dependent IgG anti-platelet antibodies were detected, which also showed weak reactivity with ampicillin.
Findings:
- The patient's antibodies reacted with platelets only in the presence of exogenous cefotetan, not with drug-coated platelets.
- This unique reaction pattern suggests a non-hapten mechanism for cefotetan-induced immune thrombocytopenia.
- This is the first documented case of cefotetan, a cephalosporin derivative, inducing immunologic thrombocytopenia.
Implications:
- Highlights a novel mechanism of drug-induced immune thrombocytopenia.
- Clinicians should consider cefotetan as a potential cause of thrombocytopenia in surgical patients.
- Further research is needed to elucidate the specific immunologic pathways involved in cefotetan-induced platelet destruction.