Figure 3
From: New Spirometry Indices for Detecting Mild Airflow Obstruction
Representative images for a 54 year old African American male with a 34 pack-year smoking history who had significant symptom burden, with mMRC score of 3, and SGRQ score of 48. His lung function by traditional criteria was normal with FEV1/FVC of 0.72, and FEV1%predicted of 100.1%. Flow volume curve appears normal, however Parameter D was −0.08, which is abnormal. Computed tomography revealed 0.5% emphysema and 25% fSAD (highlighted in red). mMRC = Modified Medical Research Council Dyspnea Scale. SQRQ = St. George’s Respiratory Questionnaire. FEV1 = Forced Expiratory Volume in the first second. FVC = Forced Vital Capacity. fSAD = Functional small airway disease.
