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Acute generalized exanthematous pustulosis due to tetrazepam
E Thomas1, T Bellón, P Barranco
1Allergy Department, Hospital La Paz, Madrid, Spain.
Summary
Tetrazepam can cause a severe skin reaction called acute generalized exanthematous pustulosis (AGEP). This study found tetrazepam-specific T cells and increased IL-8 in skin, indicating a T cell-mediated reaction.
Area of Science:
- Dermatology
- Immunology
- Pharmacology
Background:
- Tetrazepam, a widely used muscle relaxant in Spain, is known to cause occasional cutaneous side effects.
- Acute generalized exanthematous pustulosis (AGEP) is a severe cutaneous adverse drug reaction characterized by widespread pustules.
- Understanding the immunological mechanisms of drug-induced AGEP is crucial for patient safety and management.
Observation:
- A patient presented with a generalized pruriginous cutaneous reaction consistent with AGEP following tetrazepam use.
- Delayed positive patch test reactions to tetrazepam were observed, while other benzodiazepines showed no reactivity.
- Immunohistochemical analysis revealed a significant infiltrate of CD4+ and CD8+ T lymphocytes in the affected skin.
Findings:
- Quantitative polymerase chain reaction detected elevated interleukin (IL)-8 mRNA levels in tetrazepam-exposed skin.
- Lymphoblast transformation test (LTT) demonstrated a positive response specifically to tetrazepam, but not to diazepam.
- The combination of a positive patch test and LTT suggests tetrazepam-specific T cells mediate the observed AGEP reaction.
Implications:
- These findings support the role of IL-8 and drug-specific T cells in the pathogenesis of AGEP.
- The results imply that tetrazepam-induced AGEP is a specific T cell-mediated hypersensitivity reaction.
- This study suggests a lack of cross-reactivity with other benzodiazepines, aiding in the selection of alternative muscle relaxants.
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