Food dependent exercise induced anaphylaxis triggered by inhaled antigen

Area of Science:

• Allergy and Immunology
• Exercise Physiology

Background:

• Food-dependent exercise-induced anaphylaxis (FDEIA) is a rare condition where physical activity potentiates allergic reactions to specific foods.
• Exercise-induced anaphylaxis (EIA) is a related condition occurring solely with exercise, without a food trigger.

Observation:

• A 23-year-old professional cyclist experienced anaphylaxis during a race.
• The reaction was triggered by exposure to inhaled almond pollen from an orchard the race passed through.
• This represents a unique presentation of FDEIA, typically associated with ingested allergens.

Findings:

• The patient's anaphylaxis was induced by inhaled allergens (almond pollen) in conjunction with exercise.
• Mast cell degranulation occurred due to the combination of physical exertion and allergen exposure.
• This case expands the known triggers for FDEIA beyond ingested foods.

Implications:

• Highlights the potential for inhaled allergens to trigger FDEIA in susceptible individuals during exercise.
• Suggests a need for broader consideration of environmental allergens in FDEIA diagnosis.
• Emphasizes the critical role of prompt and aggressive medical management for severe anaphylactic events.