[Hypersensitivity reactions to beta-lactam antibiotics].

Area of Science:

• Immunology
• Pharmacology
• Clinical Medicine

Background:

• Beta-lactam antibiotics are widely prescribed, with a significant percentage of patients reporting penicillin allergy.
• However, the clinical diagnosis of beta-lactam allergy is frequently inaccurate, leading to unnecessary avoidance of crucial medications.
• Distinguishing between immediate and delayed hypersensitivity reactions is critical for appropriate patient management.

Purpose of the Study:

• To differentiate between immediate and delayed hypersensitivity reactions to beta-lactam antibiotics.
• To evaluate the diagnostic accuracy of allergy challenge tests, including skin and oral challenges.
• To guide the identification of safe antibiotic alternatives for patients with confirmed beta-lactam allergy.

Main Methods:

• Clinical assessment of patient history and reaction types (immediate vs. delayed).
• Performance of oriented skin tests based on clinical presentation.
• Administration of oral challenges in patients with negative skin tests and no contraindications.

Main Results:

• The diagnosis of beta-lactam allergy is overestimated in a significant proportion of patients.
• Immediate hypersensitivity reactions can manifest as anaphylaxis, while delayed reactions range from exanthema to severe conditions like DRESS.
• Allergy challenge tests demonstrated efficacy in confirming or refuting beta-lactam allergy.

Conclusions:

• Accurate diagnosis of beta-lactam antibiotic allergy is essential to avoid unnecessary drug avoidance.
• A systematic approach combining clinical evaluation and allergy challenge tests is effective in diagnosing beta-lactam hypersensitivity.
• Identifying true allergies allows for the selection of safe beta-lactam alternatives, improving patient care.