Systemic atopy and immunoglobulin deficiency in Turkish patients with vernal keratoconjunctivitis.

PURPOSE: To determine the prevalence of systemic atopy and immunoglobulin (Ig) deficiencies in vernal keratoconjunctivitis (VKC).

METHODS

Sixty-seven VKC subjects (79.1% boys) with a mean age of 11.3 ± 4.3 years were included. Serum Ig levels and specific IgE levels were measured using the nephelometric method and reversed enzyme immunoassay with sandwich ELISA technique, respectively. The patients underwent epidermal skin tests with commercial extracts.

RESULTS

Family history of atopy and associated systemic allergies were detected in 32.8 and 40.3% of the subjects, respectively. Blood eosinophilia, elevated total, and specific IgE and positive skin tests were detected in 33.8, 42.2, 50, and 35% of the subjects, respectively. Out of 62 subjects, low levels of IgA, IgG, IgM, and IgG3 were detected in 12.9, 8, 6.5, and 1.6% of the patients, respectively.

CONCLUSION

IgE-mediated mechanisms are involved in approximately 40% of VKC patients. A new finding was the higher incidence of Ig deficiency.