Spa therapy has been performed at our medical center for last 20 years. The changes in number and frequency of patients with respiratory disease were analyzed every 5 year for last 20 years. The total number of patients with respiratory disease who were admitted at our medical center for last 20 years was 1934, of whom the number of patients with asthma was 1226 (63.4%), and the number of those with COPD was 415 (21.5%). The number of patients with asthma treated with spa therapy showed a tendency to increase form 57 for the first 5 years (first stage) to 465 for the last 5 years (forth stage). The number of patients with COPD also increased from 26 for the first 5 years to 227 for the last 5 years. The frequency of SDIA decreased from 68.4% for the first 5 years to 29.0% for the last 5 years. In contrast, the frequency of pulmonary emphysema increased 19.2% at the first stage to 76.7% at the forth stage. The number and frequency of elderly patients with asthma and COPD over the age of 60 tended to increase for last 20 years.

N-3 fatty acids are reportedly effective for asthma. In addition, spa therapy has been reported to be effective for patients with asthma. In the present study, the effects of spa therapy combined with perilla seed oil-rich diet (rich in n-3 fatty acid) were examined on asthma. A total of 14 asthmatic patients had a complex spa therapy and consumed a perilla seed oil-rich diet-rich in α-linolenic acid (α-LNA) for 8 weeks. Generation of leukotriene (LT) C4 by leucocytes, respiratory function were analyzed. The generation of LTC4 by leucocytes decreased significantly for 2, 4 and 8 weeks (P<0.05). Peak expiratory flow (PEF) values increased significantly for 2, 4, 6 and 8 weeks (P<0.05). The values of ventilatory parameters [forced vital capacity (FVC), forced expiratory volume in one second (FEV₁), forced expiratory flow after 25% of expired FVC (FEF₂₅), forced expiratory flow after 75% of expired FVC (FEF₇₅), mean expiratory flow during the middle half of the FVC (FEF_25-75)] revealed a significant increase after 4 and 8 weeks of the modified diet (P<0.05). The results suggest that spa therapy combined with a perilla seed oil-rich diet are effective in the treatment of asthma in terms of its ability to suppress LTC4 generation by leucocytes, and in inducing an improvement of pulmonary function.

Effects of spa therapy on asthma were studied in 64 patients with asthma in relation to the generation of leukotrienes B4 (LTB4) and C4 (LTC4) and bronchial hyperresponsiveness. 1. The efficacy of spa therapy was marked in 12 (18.8%), and moderate in 45 (70.3%) of 64 patients with asthma, and slight or no efficacy of the therapy was observed in the residual 7 patients (10.9%). 2. Bronchial hyperresponsiveness to methacholine was the highest in patients with slight or no efficacy of spa therapy, however, there were no significant differences among the three groups classified by clinical efficacy. 3. The generation of LTC4 by leucocytes was significantly higher in patients with slight or no efficacy compared with the generation in those with marked (p<0.01) and moderate efficacy (p<0.001). However, there were no significant differences in the generation of LTB4 among them. 4. The generation of LTC4 before spa therapy significantly decreased in patients with marked (p<0.001) and moderate efficacy (p<0.01) after spa therapy, but not in those with slight or no efficacy. The generation of LTB4 was not significantly different before and after spa therapy among patients with marked, moderate, and slight or no efficacy. These results show that the efficacy of spa therapy for patients with asthma is closely related to the generation of LTC4 by leucocytes, and that the generation of LTC4 significantly decreases after spa therapy in patients with spa efficacy.

The patients with asthma or pulmonary emphysema who were admitted at our hospital for last 9 years (1992-2000) were examined in relation to frequency of disease, patient age, and areas where patients came.
1. Of 1271 patients (141.2 patients/year) with respiratory disease admitted for last 9 years, 808 (63.6%, 97.8 patients/year) were patients with asthma, and 157 (12.4%, 17.4 patients/year)) were those with pulmonary emphysema.
2. The frequency of patients with asthma for all patients with respiratory desease tended to decease from 82.1% in 1992 to 51.3% in 2000, while the frequency of those with pulmonary emphysema increased from 2.8% in 1992 to 24.4% in 2000.
3. The number of patients with asthma over the age of 70 years was larger in those inside Tottori prefecture, and the number of patients between the ages of 60 and 69 years was larger in those from distant areas. The age was more than 50 years in all patients with pulmonary emphysema.
4. The number of patients with asthma from distant areas (outside Tottori prefecture) was larger (456 patients; 56.4%) than the number of those inside Tottori prefecture (352 patients) for 9 years. The number of patients from Okayama, Hiroshima, Hyogo and Osaka was larger than the number from other distant areas.

The kind of respiratory disease, age, and areas where patients came from, were analyzed in 763 patients with COPD admitted at our hospital for last 7 years from 1992 to 1998. 1. For the last 7 years 886 patients with respiratory diseases were admitted at our hospital. Of these patients, 763 (86.1%) were those with COPD. Of the 763, 613 (80.3%) were patients with asthma, 27 with chronic bronchitis, 41 with obstructive bronchiolitis, and 87 with pulmonary emphysema. 2. The number of patients with pulmonary emphysema showed a tendency to increase. 3. The number of patients from distant areas was considerably larger (43.8% in 1997, 53.4% in 1998) compared to the number of patients from Tottori prefecture. The number of patients from Okayama, Hyogo, Osaka, Hiroshima, Yamaguchi, and Ehime prefectures was predominantly larger than the number of patients from other distant areas. 4. Regarding the age distribution of these patients, the number of patients over the age of 60 was predominantly larger than the number of patients under the age of 59: patients between the ages of 60 and 69 were more frequently observed in those coming from distant areas (outside Tottori prefecture), and those over the age of 70 in those coming from Tottori prefecture.