Abstract
It is a well known clinical fact that weather change may precipitate the onset of symptoms in patients with bronchial asthma, chronic bronchitis, or pulmonary emphysema. They may complain of cough, chest discomfort, wheezing, or dyspnea during a seasonal change in the weather or when they experience an environmeptal temperature change. Previous investigators (1-2) have shown that either inhalation of cold air alone or whole body exposure to cold increases resistance to air flow. Recently, other studies based on daily and weekly measurements of pulmonary function in normal subjects and patients with chronic obstructive lung disease at ambient conditions showed that airway resistance increased as temperature decreased (3-6). Wells and associates (1) also indicated that normal subjects and patients with chronic lung disease who gave no history of symptoms in cold were not affected by breathing cold air. pulmonary disease, with and without history of symptoms during exposure to cold air, were studied.
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