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Piperacillin-Tazobactam-Induced Immune Thrombocytopenia: A Case Report
1Department of Medicine, Division of Hospital Internal Medicine, 4352Mayo Clinic, Rochester, MN, USA.
Abstract:
Drug-induced immune thrombocytopenia is an isolated thrombocytopenia caused by accelerated platelet destruction from drug-dependent, platelet-reactive antibodies. Heparin-induced thrombocytopenia is the most common drug-induced immune thrombocytopenia. Common implicated antibiotics for drug-induced immune thrombocytopenia include ceftriaxone, trimethoprim-sulfamethoxazole, vancomycin, and penicillin. The platelet nadir can be less than 20 × 10 (9)/L and typically occurs within 1 to 2 weeks of exposure to the inciting drug. Although rare, drug-induced immune thrombocytopenia can be fatal. Diagnosis is made by excluding other causes of thrombocytopenia. Laboratory testing for drug-dependent antiplatelet antibodies is often helpful but not required. Thrombocytopenia typically improves within 1 to 2 days of drug discontinuation and platelet count returns to normal within a week. Identifying and discontinuing the implicated medication is key to prevention of serious complications. A patient case of drug-induced immune thrombocytopenia is described after initiation of empiric piperacillin-tazobactam for refractory right foot cellulitis in the setting of right fourth toe diabetic ulcer.
Insights
Drug-induced immune thrombocytopenia (DITP) occurs when drugs trigger antibodies that destroy platelets. Promptly stopping the offending drug is crucial for recovery and preventing severe complications.
Area of Science:
- Hematology
- Immunology
- Pharmacology
Background:
- Drug-induced immune thrombocytopenia (DITP) is a serious condition characterized by accelerated platelet destruction.
- It results from drug-dependent, platelet-reactive antibodies, with heparin-induced thrombocytopenia being the most common form.
- Antibiotics like ceftriaxone, trimethoprim-sulfamethoxazole, vancomycin, and penicillin are frequently implicated in DITP.
Observation:
- Thrombocytopenia in DITP can be severe, with platelet nadirs below 20 × 10^9/L.
- Onset typically occurs 1-2 weeks after exposure to the causative drug.
- A patient case illustrates DITP following piperacillin-tazobactam initiation for cellulitis in a diabetic foot ulcer.
Findings:
- Diagnosis involves excluding other causes of thrombocytopenia; laboratory testing for drug-dependent antiplatelet antibodies can be supportive but is not mandatory.
- Platelet counts usually improve within 1-2 days of drug discontinuation and normalize within a week.
- Identifying and discontinuing the implicated medication is the cornerstone of management.
Implications:
- DITP, though rare, can be fatal, underscoring the importance of timely diagnosis and intervention.
- Early recognition and withdrawal of the offending agent are critical for preventing serious complications.
- This case highlights the potential for piperacillin-tazobactam to induce DITP, emphasizing vigilance in patients with risk factors.
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