Increase of acute frontal sinusitis in southwestern Finland.

The number of patients hospitalized for acute infection in the frontal sinuses at the Department of Oto-Rhino-Laryngology of Turku University Hospital has increased markedly during the last decade. Causes for this increase were evaluated by comparing the backgrounds and medical findings of the 134 patients treated in the years 1977-81 and those of the 421 patients treated in the years 1982-86. Nasal polyps and history of allergic rhinitis were considerably more common in the latter patient group. The disease also seems to recur increasingly in the same patients. Of the aerobic bacteria Streptococcus pneumoniae and Haemophilus influenzae were the most common pathogens and the share of H. influenzae increased slightly, becoming the commonest pathogen in the latter 5-year period. Increasing air pollution in the city area of Turku is worth consideration and should be investigated further.