[Effectiveness of Nd: YAG laser therapy on Japanese cedar pollinosis].

Many have reported on the effectiveness of laser surgery therapy for perennial allergic rhinitis. However, the suppressive effects of laser irradiation on allergic rhinitis and its symptoms have not been reported in patients with pollinosis. This is because therapeutic effects on pollinosis are difficult to evaluate. The amount of pollen in the air varies during the year, and from year to year. Also, allergic symptoms develop due to exposure to the amount of pollen which is markedly influenced by the weather. In this study, the severity of allergic symptoms in the pollen season was compared between patients treated with early medication, non-treated patients and patients treated with preseasonal contact Nd: YAG laser surgery. Results suggests that laser surgery was effective in reducing the severity of symptoms in patients with cedar pollinosis. Symptoms were milder in the laser group than in the medication group and non-treated group for 3-4 weeks after the start of seasonal pollinosis, although no differences were noted in the early weeks. This may be explained by the fact that laser irradiation reduces the lamina propria of the nasal mucosa, the site of allergic reactions. This also suggests that allergic pollen can't penetrate the mucosal surface which shows squamous epithelization after laser irradiation.