case_images: PMC10442578_01
case_images: Flowchart of events.
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case_images: F1
case_images: In December 2020, he was transferred to the Pulmonary Medicine Center of Pusan National University Yangsan Hospital for additional assessment and management (Fig. 1). To investigate and evaluate the potential connection between airflow obstruction and work, serial peak expiratory flow (PEF) was monitored four times daily for four weeks (Fig. 5, Supplementary Table 1).
case_images: Posteroanterior chest radiograph obtained on December 2, 2020.
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case_images: F2
case_images: Findings of the spirometry examination obtained on December 2, 2020.. FVC: forced vital capacity; FEV1: forced expiratory volume in one second; FEF25-75%: forced expiratory flow at 25 and 75% of the pulmonary volume; FET100%: forced expiratory time; PEF: peak expiratory flow; PEFT: peak expiratory flow time; FIVC: forced inspiratory vital capacity; MVV: maximal voluntary ventilation; CHG: change.
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case_images: F3
case_images: A spirometry test was conducted, and the results indicated that the forced expiratory volume in one second (FEV1) was 3.69 L (85% predicted), the forced vital capacity (FVC) was 4.36 L (85% predicted), and the FEV1/FVC ratio was 85% (Fig. 3).
case_images: Findings of the Methacholine bronchial provocation test performed on December 2, 2020.. FEV1: forced expiratory volume in one second.
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case_images: F4
case_images: The results showed that the provocative concentration resulting in a decrease in FEV1 by >= 20% (PC20) was 2.60 mg/mL (reference range: >= 16 mg/mL) and positive reversibility with a short-acting ss2 agonist (Fig. 4).
case_images: Serial peak expiratory flow measurement from October 19, 2022, to November 14, 2022.
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case_images: F5
case_images: To investigate and evaluate the potential connection between airflow obstruction and work, serial peak expiratory flow (PEF) was monitored four times daily for four weeks (Fig. 5, Supplementary Table 1).