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Abstract
We aimed to ascertain whether monitoring changes in transcutaneous (tc) oxygen partial pressure (PO2) may be used to determine the slope of the dose-response curves to inhaled methacholine. In 10 adult asthmatic patients, FEV1 and tcPO2 were simultaneously measured during inhalation of doubling methacholine concentrations. In each patient, the slopes of the methacholine dose-response curves for FEV1 and tcPO2 were similar and strongly correlated (r = 0.72; p < 0.05). The results indicate that tcPO2 monitoring represents a useful, reliable tool for analysis of the slope of dose-response curves to inhaled methacholine in asthmatic patients. It can also be used to investigate the pathophysiological implications of bronchial hyperreactivity.
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