The respiratory function was examined in patients with nasal allergy without bronchial asthma. Forced vital capacity (FVC), forced expiratory volume in one second (FEV 1.0), peak flow rate (PFR) and maximum expiratory flow volume curve (MEFV curve) were measured. The flow rates at 25% (V
25), 50% (V
50) and 75% (V
75) of the vital capacity were calculated from the MEFV curves to detect changes in the lower airway. The measurements were carried out before and after the nasal provocation using paper disks and antigen solution.
The results were obtained as follows:
1. All the values in the normal control group were found to be within normal limits. Twelve point five percent of the patients showed a decrease in V
50, while 35% showed a decrease in V
25.
2. No changes were recorded when the provocation was attempted in the nasal cavity with paper disks.
3. The value of V
50 decreased more than 20 per cent in 41.6% of the patients after the antigen solution was inhaled through the nose.
4. there was a decrease in the values of PFR, V
75 V
50 and V
25 after the inhalation of the antigen solution through the mouth. In particular, a decrease in V
50 was observed in 26.6% of the patients and that in V
25 was in 31.1%.
Based on the above results, it was assumed that certain patients with nasal allergy without clinical manifestation of asthma had appreciable obstruction or hypersensitivity in the lower airway and should be taken as potential cases to develope bronchial asthma in future.
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