170 Combination of a Nasal Antihistamine Olopatadine and A Leukotriene Receptor Antagonist Montelukast Sodium for the Treatment of Seasonal Allergic Patients not Currently Controlled on Monotherapy Intranasal Antihistamine or a Leukotriene Receptor Antagonist

and Asthma in 4 different regions. Methods: The study was performed on 461 children aged 5 to 15 years, from 4 different regions in Guatemala. A questionnaire was given to record information regarding family history of atopic disease and symptoms of Rhinitis and Asthma. The diagnosis was made in the presence of at least 3 symptoms of each disease. Scratch testing was performed using a commercially available device and a panel of 8 allergen extracts: Cypress Arizona, Dog, Cat, Dermatophagoides farinae and pteronyssinus, Cockroach Mix, Mold Mix and Bermuda grass. Results: Patient average age was 8.3 years, 55% male and 45% female. Patient distribution by region was 35% from Huehuetenango, 29% Chiquimula, 18% Mazatenango and 18% Quetzaltenango. Family history of allergic rhinitis was present in 46% of patients, asthma in 51% and atopic dermatitis in 33%. The most common diagnosis was rhinitis in 86% of patients, 52% had asthma and 43%, both rhinitis and asthma. 98% had a positive Histamine Control and all a Negative Saline Control. 36% of patients had no allergy sensitization to allergens tested and 64% showed positive skin tests. The most frequent allergic sensitization was to Dermatophagoides pteronyssinus (44%) and farinae (43%), followed by Cockroach (28%). We also found less frequently, positive skin tests to grass (14%), Cat (14%), Mold (10%), Dog (8%) and Cypress (6%). The regions with higher dust mite sensitization were Quetzaltenango (51–55%) and Huehuetenango (45–51%). Conclusions: The most common allergen sensitizations in children with allergic rhinitis and asthma in Guatemala are dust mites and cockroach. Family history of either rhinitis or asthma is present in a significant amount of patients (46–51%) with atopic disease and allergic sensitization, showing that it is an important risk factor in Guatemala. In 36% of patients in this study, allergic sensitization does not seem to contribute to their rhinitis and asthma symptoms.