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. 2022 Feb 9;14(2):196–209. doi: 10.4168/aair.2022.14.2.196

Fig. 7. Heatmap showing the relationship between the absence or presence of mucus plugs and pulmonary function in asthmatic, ACO, and COPD patients.

Fig. 7

ACO, asthma-chronic obstructive pulmonary disease overlap; COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; FEF 25–75, forced expiratory flow at 25%–75% of forced vital capacity; R5 and R20, respiratory resistance at 5 and 20 Hz; R5–R20, the difference between R5 and R20; X5, respiratory reactance at 5 Hz; Fres, resonant frequency; ALX, low-frequency reactance area.