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Lung India Official publication of Indian Chest Society  
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Year : 1998  |  Volume : 16  |  Issue : 2  |  Page : 65-68

Effect Of Climatic Variation On Spirometric Indices In Patients Of Bronchial Asthma

Correspondence Address:
Dushyant Sharma

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The effect of temperature and humidity on pulmonary function was studied in 25 patients of bronchial asthma and 10 normal subjects. The effect was studied by recording the influence of cold dry air, cold humid air, warm dry air, and warm humid air inhalations on pulmonary function in each subject. The average fall in forced expiratory volume in one second (FEV1) and peak expiratory flow rate (PEFR) from pre-test value with cold dry air inhalation was 12.9% and 10.9% respectively, and with cold humid air 3.9% and 3.7% respectively. Warm dry air produced a fall of 6.4% and 3.6% in FEV1 and PEFR respectively. However, warm humid air inhalations registered an increase of 1.6% and 1.9% in FEV1 and PEFR respectively. All these changes were statistically significant. No significant change was observed in control subjects. This study suggests that the adverse effects of temperature and humidity on pulmonary function were more with cold dry air inhalations than with cold humid, warm dry or warm humid air inhalations in patients with bronchial asthma.

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