Lung function by plethysmography: a new method in Vietnam for asthma diagnosis

Abstract : Despite the increasing prevalence of asthma in Viet Nam, the country has limited means for respiratory function testing. A previous study using the forced oscillation technique suggested lower respiratory resistance between French and Vietnamese children at 10 years but not 6 years of age. If the hypothesis of a significant ethnic difference in airway caliber is correct, then similar differences should exist at adult age. To test the hypothesis, a plethysmographic study was set up to measure airway resistance and specific airway resistance in healthy young adults in France and Viet Nam. We took advantage of the study to provide reference values for lung volume in these populations. Airway resistance is significantly larger in Vietnamese than in Caucasians but there is no difference in specific airway resistance. Altogether the study does not support the consequence of a putative ethnic difference in childhood airway caliber on airway resistance normalized for lung volume at adult age. The standing height is the best predictor of the total lung capacity, while ethnicity is an important predictor of vital capacity and of the residual volume to total lung capacity ratio. This is the first study which provides reference values for airway resistance, specific airway resistance and lung volumes by plethysmography in healthy young Vietnamese adults. Plethysmography was validated in the north of Viet Nam, and the study allowed initiating a young working group on asthma diagnosis in Vietnam
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Thành Lê Tuan. Lung function by plethysmography: a new method in Vietnam for asthma diagnosis. Human health and pathology. Université de Lorraine, 2015. English. ⟨NNT : 2015LORR0341⟩. ⟨tel-01752263⟩

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