Subconjunctival cephalosporin anaphylaxis

Area of Science:

• Ophthalmology
• Allergy and Immunology
• Pharmacology

Background:

• Patients with a history of penicillin allergy are at increased risk for cephalosporin-induced hypersensitivity.
• Subconjunctival injections are common ophthalmic procedures.
• Cephalosporins are broad-spectrum antibiotics used to treat bacterial infections.

Observation:

• A patient developed a systemic anaphylactic reaction following a subconjunctival injection of cephalosporin.
• The patient required intensive medical intervention, including airway intubation, to manage the reaction.
• The patient had a documented history of penicillin allergy.

Findings:

• Local administration of even 50 mg of cephalosporin can precipitate a severe, life-threatening anaphylactic reaction.
• Cross-reactivity between penicillin and cephalosporin allergies can manifest systemically.
• Systemic anaphylaxis can occur despite the localized route of drug administration.

Implications:

• Ophthalmologists should exercise extreme caution when administering cephalosporins to patients with a history of penicillin allergy.
• Pre-procedure screening for antibiotic allergies is crucial in ophthalmic practice.
• Awareness of potential systemic reactions to locally administered antibiotics is vital for patient safety.