1. Impact of coronavirus disease 2019 on pulmonary function in early convalescence phase.
- Author
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Huang Y, Tan C, Wu J, Chen M, Wang Z, Luo L, Zhou X, Liu X, Huang X, Yuan S, Chen C, Gao F, Huang J, Shan H, and Liu J
- Subjects
- Adult, Aged, COVID-19, Chi-Square Distribution, China epidemiology, Cohort Studies, Convalescence, Exercise Test, Female, Follow-Up Studies, Forced Expiratory Volume, Humans, Incidence, Male, Middle Aged, Muscle Strength, Pandemics, Patient Discharge, Radiography, Thoracic methods, Respiratory Function Tests, Retrospective Studies, Risk Assessment, Severe Acute Respiratory Syndrome epidemiology, Spirometry methods, Tertiary Care Centers, Tomography, X-Ray Computed methods, Vital Capacity physiology, Coronavirus Infections diagnosis, Coronavirus Infections epidemiology, Pneumonia, Viral diagnosis, Pneumonia, Viral epidemiology, Respiratory Muscles physiopathology, Severe Acute Respiratory Syndrome diagnosis
- Abstract
Objective: This study investigated the influence of Coronavirus Disease 2019 (COVID-19) on lung function in early convalescence phase., Methods: A retrospective study of COVID-19 patients at the Fifth Affiliated Hospital of Sun Yat-sen University were conducted, with serial assessments including lung volumes (TLC), spirometry (FVC, FEV1), lung diffusing capacity for carbon monoxide (DLCO),respiratory muscle strength, 6-min walking distance (6MWD) and high resolution CT being collected at 30 days after discharged., Results: Fifty-seven patients completed the serial assessments. There were 40 non-severe cases and 17 severe cases. Thirty-one patients (54.3%) had abnormal CT findings. Abnormalities were detected in the pulmonary function tests in 43 (75.4%) of the patients. Six (10.5%), 5(8.7%), 25(43.8%) 7(12.3%), and 30 (52.6%) patients had FVC, FEV1, FEV1/FVC ratio, TLC, and DLCO values less than 80% of predicted values, respectively. 28 (49.1%) and 13 (22.8%) patients had PImax and PEmax values less than 80% of the corresponding predicted values. Compared with non-severe cases, severe patients showed higher incidence of DLCO impairment (75.6%vs42.5%, p = 0.019), higher lung total severity score (TSS) and R20, and significantly lower percentage of predicted TLC and 6MWD. No significant correlation between TSS and pulmonary function parameters was found during follow-up visit., Conclusion: Impaired diffusing-capacity, lower respiratory muscle strength, and lung imaging abnormalities were detected in more than half of the COVID-19 patients in early convalescence phase. Compared with non-severe cases, severe patients had a higher incidence of DLCO impairment and encountered more TLC decrease and 6MWD decline.
- Published
- 2020
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