Fig. 1From: Preoperative inhalation therapy for patients with chronic obstructive pulmonary disease undergoing lung surgery: a retrospective studyStudy flowchart showing the clinical protocol for performing respiratory function testing of study patients. COPD, chronic obstructive pulmonary disease; FEV1.0, forced expiratory volume in 1.0 s; ICS, inhaled corticosteroid; LABA, long-acting β2-agonist; LAMA, long-acting muscarinic antagonistBack to article page