tetano
Editor, Senior Moderator
Respir Res
. 2020 Jun 29;21(1):163.
doi: 10.1186/s12931-020-01429-6.
Impact of Coronavirus Disease 2019 on Pulmonary Function in Early Convalescence Phase
Yiying Huang[SUP] 1 2 [/SUP], Cuiyan Tan[SUP] 1 [/SUP], Jian Wu[SUP] 1 [/SUP], Meizhu Chen[SUP] 1 [/SUP], Zhenguo Wang[SUP] 1 [/SUP], Liyun Luo[SUP] 3 [/SUP], Xiaorong Zhou[SUP] 1 [/SUP], Xinran Liu[SUP] 1 [/SUP], Xiaoling Huang[SUP] 1 [/SUP], Shican Yuan[SUP] 1 [/SUP], Chaolin Chen[SUP] 1 [/SUP], Fen Gao[SUP] 1 [/SUP], Jin Huang[SUP] 1 [/SUP], Hong Shan[SUP] 2 [/SUP], Jing Liu[SUP] 4 5 [/SUP]
AffiliationsExpand
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.
Keywords: COVID-19; Early convalescence; Lung function; Respiratory muscle strength.
. 2020 Jun 29;21(1):163.
doi: 10.1186/s12931-020-01429-6.
Impact of Coronavirus Disease 2019 on Pulmonary Function in Early Convalescence Phase
Yiying Huang[SUP] 1 2 [/SUP], Cuiyan Tan[SUP] 1 [/SUP], Jian Wu[SUP] 1 [/SUP], Meizhu Chen[SUP] 1 [/SUP], Zhenguo Wang[SUP] 1 [/SUP], Liyun Luo[SUP] 3 [/SUP], Xiaorong Zhou[SUP] 1 [/SUP], Xinran Liu[SUP] 1 [/SUP], Xiaoling Huang[SUP] 1 [/SUP], Shican Yuan[SUP] 1 [/SUP], Chaolin Chen[SUP] 1 [/SUP], Fen Gao[SUP] 1 [/SUP], Jin Huang[SUP] 1 [/SUP], Hong Shan[SUP] 2 [/SUP], Jing Liu[SUP] 4 5 [/SUP]
AffiliationsExpand
- PMID: 32600344
- DOI: 10.1186/s12931-020-01429-6
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.
Keywords: COVID-19; Early convalescence; Lung function; Respiratory muscle strength.