Acute respiratory distress caused by erythromycin hypersensitivity

Area of Science:

• Clinical Immunology
• Pulmonology
• Pharmacology

Background:

• Erythromycin stearate is an antibiotic commonly prescribed for bacterial infections.
• Adverse drug reactions can range from mild to life-threatening.
• Allergic responses to medications are a significant clinical concern.

Observation:

• A patient developed severe respiratory distress and complete left lung atelectasis after ingesting erythromycin stearate.
• Intravenous administration of prednisolone sodium tetrahydrophthalate led to rapid clinical improvement and lung re-expansion.
• Diagnostic tests indicated the presence of both IgE and heat-stable, non-IgE antibodies against erythromycin.

Findings:

• The patient's reaction suggests a dual allergic mechanism involving Type 1 (IgE-mediated) and Type 3 (non-IgE-mediated) hypersensitivity.
• The findings highlight the potential for erythromycin to elicit complex allergic responses.
• Mast cell degranulation tests were instrumental in identifying the specific antibody types involved.

Implications:

• This case underscores the importance of considering allergic reactions in patients presenting with acute respiratory distress post-antibiotic exposure.
• Understanding the immunological basis of drug hypersensitivity can guide diagnostic and therapeutic strategies.
• Further research into non-IgE-mediated antibiotic allergies is warranted.