Pulmonary Function and CT Scan Finding in CKD Patients After COVID-19 Infection

Spirometry was performed by trained nurse at division of pulmonology, Vajira hospital. The forced vital capacity (FVC), forced expiratory volume in first second of exhalation (FEV1), forced mid-expiratory flow (FEF25-75%), and the FEV1/FVC ratio before and after bronchodilators (2 puffs of salbutamol via spacer) were collected in all cases. Total lung capacity (TLC) using the spirometry (Masterscreen PFT, Jaeger, Germany) and diffusion capacity of carbon monoxide was performed in selected case with abnormalities of lung parenchyma found from computed tomography of the chest.

High-resolution computed tomography (HRCT) was performed in a single breath-hold on a 128 slice multidetector computed tomography (MDCT) scanner (Philips Healthcare Nederland B.V, Ingenuity 128, Netherlands). HRCT was performed with the patient in the supine position during end-inspiration, supine position during end-expiration, and prone position during end-inspiration with 1 millimeter (mm) slice thickness.