Objective: To investigate the relationship between allergic rhinitis and allergic asthma in the patients with autumnal pollinosis.
Methods: 1120 patients with autumnal pollinosis, aged 5 - 75, excluding those with typical symptoms of seasonal rhinitis or asthma but with positive skin test and serum IgE specific to dustmite and fungi, underwent standardized clinical questionnaire survey, including the onset age, onset time, and symptoms as well as the severity of asthma, skin tests, and examination of serum IgE specific to autumnal pollens.
Results: The average onset age of the allergic rhinitis patients induced by autumnal pollens was 27.9 years, significantly younger than that of the allergic asthma patients (32.6 years, P < 0.001). Out of the 1120 patients 1096 (97.9%) had allergic rhinitis, 602 (53.8%) had asthma, 507 (45.3%) had allergic rhinitis only, and 10 (0.9%) had allergic asthma only. Among the 1096 patients with allergic rhinitis 585 (53.4%) suffered from seasonal asthma. Among the 602 patients with asthma 585 (97.2%) suffered from seasonal rhinitis, and 183 of the 602 patients (30.8%) needed emergency treatment.
Conclusion: Autumnal pollens are very important causes which induce asthma during autumnal season in northern China.
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