Positive skin tests and Prausnitz-Küstner reactions in metabisulfite-sensitive subjects

Area of Science:

• Allergy and Immunology
• Gastroenterology
• Pulmonology

Background:

• Sulfiting agents are common food additives linked to various adverse reactions, including anaphylaxis and asthma.
• The exact mechanism behind sulfiting agent sensitivity remains unclear, with debate surrounding the role of IgE-mediated responses.

Observation:

• This study investigated 53 patients experiencing symptoms after consuming restaurant meals or alcoholic beverages, with food allergy ruled out.
• Symptoms ranged from urticaria/angioedema and asthma to headache and anaphylaxis.
• Skin testing and oral challenge tests with potassium metabisulfite were performed on patients and healthy controls.

Findings:

• Five patients exhibited positive skin tests to potassium metabisulfite.
• Oral provocative challenge tests confirmed reactions in one patient with anaphylaxis and three with asthma.
• Pulmonary function tests were conducted on asthmatic subjects.

Implications:

• The findings suggest that sulfiting agent reactions may not solely rely on IgE-mediated mechanisms.
• Further research is needed to elucidate the precise pathogenesis of sulfiting agent hypersensitivity.
• This study highlights the importance of considering sulfiting agents in the differential diagnosis of unexplained hypersensitivity reactions.