Case Report
Atsushi Isozaki, Shingo Kob
Abstract
When asthmatic patients present with cough, especially cough without wheezing, it is difficult to determine if the cough was due to asthma. A 7-year-old girl presented with persistent cough without wheezing and exacerbation of asthma. We performed bronchodilator reversibility test by determining the respiratory resistance. Respiratory resistance and impedance were measured by using the Forced Oscillation Technique (FOT) with MostGraph-01 (Chest CO., LTD., Japan). The changes were observed in colored 3-dimensional imaging patterns. The images clearly showed that the patient’s respiratory resistance decreased after administration of the bronchodilator. The measurement of respiratory impedance by the forced oscillation technique attributes to diagnose asthma.