In recent years, the number of patients with respiratory disease has been increasing. In this study, pathophysiological characteristics of asthma in the elderly were discussed in relation to the action mechanisms and the clinical efficacy of spa therapy. In the action mechanisms of spa therapy for asthma, improvements of subjective and objective symptoms and ventilatory function, decrease in airway resistance, improvement of hyperinflation of the lung, and suppression of hypersecretion were observed in direct action of the therapy. Furthermore, improvement of depressed function of adrenocortical glands, psychological relaxation, and antioxidant action (increase in SOD activity) were found in indirect action of the therapy.
Characteristics of asthma in the elderly was expressed as weak allergic reaction, decrease in ventilatory function, DLco and bronchial hyperresponsiveness, increase in residual volume accompanied by weak bronchoconstriction, and suppressed function of adrenocortical glands, which are beneficial for clinical efficacy of spa therapy. Thus, spa therapy is more effective in elderly patients than in younger patients.

Spa therapy which has been performed for patients with respiratory disease, particularly for those with asthma and pulmonary emphysema for last 22 years, demonstrates that spa therapy is effective for asthma and pulmonary emphysema. The characteristics of patients with respiratory disease has been changing during last 22 years.
The frequency and number of elderly patients with asthma, and the number of those with pulmonary emphysema has been increasing in recent years. Elderly patients with asthma and COPD including pulmonary emphysema show the narrowing of airways by mucus, and hyperinflation of the lungs as results of aging. At present time any physicians have no medication improving hyperinflation of the lungs. In the present study, evaluation of hyperinflation of the lungs by a band display procedure on HRCT and the effects of spa therapy on the hyperinflation were discussed in patients with asthma and COPD. The results show that spa therapy is important for the treatment of elderly patients with asthma and COPD, because the therapy can improve hyperinflation of the lungs without adverse side effects.

The effects of spa therapy for asthmatics with a long history of cigarette smoking were studied, compared with the effects for those without smoking history. 1. Of 22 patients with smoking history, 15 (68.2%) had definite efficacy of spa therapy (4 had marked efficacy, and 11 had moderate efficacy), and the residual 7 had slight or no efficacy. In contrast, of 36 patients without smoking history, 29 (80.6%) had definite efficacy. The effects of spa therapy for asthmatics were significantly higher in never-smokers than in ex-smokers.
2. A significant increase in the production of IgE antibodies, bronchial hyperresponsiveness and the generation of leukotrienes B₄ (LTB₄) and C₄ (LTC₄) by leucocytes was observed in ex-smokers compared with never-smokers. 3. The frequency of patients with a positive BAST against inhalant allergens was larger in subjects with slight or no efficacy than in those with marked or moderate efficacy in never-smokers, but not in ex-smokers. 4. Bronchial hyperresponsiveness was significantly increased in patients with slight or no efficacy than in those with marked or moderate efficacy both in ex-smokers and never-smoker. 5. The generation of LTB₄ was more increased in subjects with slight or no efficacy than in those with efficacy both in ex-smokers and never-smokers, however, the differences were not significant. 5. The generation of LTC₄ tended to be more increased in subjects with slight or no efficacy than in those with efficacy in never-smokers, but not in ex-smokers, although these were not significant. The results suggest that an increase in the production of IgE antibodies, bronchial hyperresponsiveness, and the generation of LTB₄ and LTC₄, which might be influenced by cigarette smoking, affect the effects of spa therapy for patients with asthma.

Effects of long-term spa therapy on reduction of the costs of drugs used for the treatment were examined in 23 patients with asthma. The costs of drugs used per patient for 1 year when spa therapy started (1997) were compared with the costs used for 1 year after spa therapy for 3 years (2000). 1. The decrease in the total costs of all drugs was \31, 910 in patients with stage 1, \74, 900 in those with stage 2, \113, 450 in stage 3, and \180, 910 in stage 4. The % decrease of the costs of drugs used was 34.2% in stage 1, 46.3% in stage 2, 37.1% in stage 3, and 42.4% in stage 4. The results showed that the reduction in the costs of drugs tended to increase as asthma severity increased, and that the % decrease of the costs was higher in stage 2 and 4, in which the %decrease was more than 40%. 2. The reduction of costs of each drug, bronchodilators, glucocorticoids, antiallergic agents, mucolytics, and antibiotics after spa therapy, was significant in patients with stage 3 and stage 4, whose severity was considerably increased. However, the decrease in the costs of these drugs after spa therapy was not significant in patients with stage 1 and 2. The reduction of the costs more than 50% was observed in bronchodilators, antiallergic agents, mucolytics, and antibiotics in patients with stage 4, in whom the reduction of the costs of these drugs was significant. The results obtained here suggest that the costs of drugs used for asthma treatment could be reduced by spa therapy in patients with more increased severity.

The effects of long-term spa therapy were studied in 10 patients with pulmonary emphysema: five patients had long-term spa therapy for 5 years (group A), and another 5 patients had not spa therapy for the same 5 years (group B). There were no significant differences in %FVC, %FEV 1.0, %LAA of the lung on HRCT, %DLco and %RV between the two groups. 1. The LAA of the lung on HRCT slightly, but did not significantly increase in patients with spa therapy for 5 years. In patients without spa therapy, the %LAA of the lung significantly increased after 4-(61.1%) (p<0.01) and 5-year observation (65.5%) (p<0.001) compared with the initial value (52.2%). 2. The %DLco and %RV values slightly decreased in patients with spa therapy, but the decrease in the two parameters was not significant. 3. The %DLco significantly decreased (67.2% to 49.0%), and the %RV also significantly increased (175.4% to 230.6%) after 5-year observation in patients without spa therapy. The results obtained here suggest that spa therapy for pulmonary emphysema should start as early as possible when the diagnosis of the disease is decided, and the therapy should be continued as long as possible.

Effects of spa therapy on % low attenuation area (LAA)<-950 HU of the lungs on HRCT at full inspiration, CT number, a ratio of expiratory LAA to inspiratory LAA (exp LAA/ins LAA), residual volume (RV) and diffusing capacity for carbon monoxide (DLco) in asthma were compared between never-smokers and ex-smokers of asthmatics.
1. The % LAA of the lungs on HRCT in asthma significantly decreased after spa therapy both in never-smokers and ex-smokers of asthmatics. CT number also significantly increased in the two groups. 2. The exp LAA/ins LAA significantly decreased after spa therapy in never-smokers, but not in ex-smokers. 3. The %RV also significantly decreased by spa therapy in never-smokers, but not in ex-smokers. 4. The DLco value did not significantly change by spa therapy both in nevers-mokers and ex-smokers. 5. The values of %FVC and %FEV 1.0 tended to increased in the two groups, but the increase was not significant. The value of FEV 1.0% significantly increased after spa therapy in never-smokers, but not in ex-smokers. The results suggest that hyperinflation and destruction of terminal airspaces are stronger in ex-smokers than in never-smokers, and that spa therapy is more effective in never-smokers than in ex-smokers.

Characteristics of low attenuation area (LAA) of the lungs on HRCT were studied in 132 patients with asthma, and long-term spa therapy on the LAA of the lungs was observed in 5 patients with asthma, whose me an %LAA was more than 30%.
1. The morphology of LAA of the lungs on HRCT observed in asthma was different from that in pulmonary emphysema. 2. The LAA of the lungs in asthma was closely related to residual volume (RV). 3. The mean %LAA value significantly decreased from 33.5% before spa therapy to 24.5% at 24 months after beginning of the therapy. CT number also significantly increased after long-term spa therapy. 4. %FEV1.0 value significantly improved from 52.1% before spa therapy to 72.1% at 24 months after spa therapy. The RV value also decreased by spa therapy, however, the decrease was not significant. These results suggest that LAA of the lungs in asthma is associated with hyperinflation, and the LAA of the lungs decreases after long-term spa therapy.

Clinical effects of spa therapy for patients with pulmonary emphysema (PE) were evaluated by observing changes in %LAA of the lung on HRCT, %RV, %FVC, %FEV 1.0, and %DLco values after the long-term therapy. The subjects in this study 16 patients with PE. The subjects were divided into two groups according to the extent of %LAA<-950 HU of the lung on HRCT: %LAA<50% (N=6) and 50%≤%LAA (N=8). 1. Spa therapy significantly improved %LAA (42.5% at the initial stage to 36.3% 24 months after spa therapy), %RV (202.1% to 156.1%) and %DLco 71.0% to 85.7%), but not %FVC and %FEV 1.0, in patients with PE of %LAA<50%, however, significant. Improvement of these parameters was not observed in patients without spa therapy. 2. Spa therapy did not improve the values of %LAA, %RV, and %DLco, as well as %FVC and %FEV 1.0, in patients with PE of 50%≤%LAA. These parameters tended to decrease in the patients of 50%≤%LAA. These results suggest that spa therapy improves %LAA and parameters related to pulmonary function when they are at early stage of PE, however, the therapy was not remarkably effective for these parameters when they were at advanced stage of PE.

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.