Peer-reviewed / Observational study / People
Two years after infection with COVID-19, half of patients who were admitted to hospital still have at least one symptom, according to the longest follow-up study to date, published in The Lancet Respiratory Medicine. The study followed 1,192 participants in China infected with SARS-CoV-2 during the first phase of the pandemic in 2020.
While physical and mental health generally improved over time, the analysis suggests that COVID-19 patients still tend to have poorer health and quality of life than the general population. This is especially the case for participants with long COVID, who typically still have at least one symptom including fatigue, shortness of breath, and sleep difficulties two years after initially falling ill. [1]
The long-term health impacts of COVID-19 have remained largely unknown, as the longest follow-up studies to date have spanned around one year. [2] The lack of pre-COVID-19 health status baselines and comparisons with the general population in most studies have also made it difficult to determine how well patients with COVID-19 have recovered.
Lead author Professor Bin Cao, of the China-Japan Friendship Hospital, China, says: Our findings indicate that for a certain proportion of hospitalised COVID-19 survivors, while they may have cleared the initial infection, more than two years is needed to recover fully from COVID-19. Ongoing follow-up of COVID-19 survivors, particularly those with symptoms of long COVID, is essential to understand the longer course of the illness, as is further exploration of the benefits of rehabilitation programmes for recovery. There is a clear need to provide continued support to a significant proportion of people whove had COVID-19, and to understand how vaccines, emerging treatments, and variants affect long-term health outcomes. [3]
The authors of the new study sought to analyse the long-term health outcomes of hospitalised COVID-19 survivors, as well as specific health impacts of long COVID. They evaluated the health of 1,192 participants with acute COVID-19 treated at Jin Yin-tan Hospital in Wuhan, China, between January 7th and May 29th, 2020, at six months, 12 months, and two years.
Assessments involved a six-minute walking test, laboratory tests, and questionnaires on symptoms, mental health, health-related quality of life, if they had returned to work, and health-care use after discharge. The negative effects of long COVID on quality of life, exercise capacity, mental health, and health-care use were determined by comparing participants with and without long COVID symptoms. Health outcomes at two years were determined using an age-, sex-, and comorbidities-matched control group of people in the general population with no history of COVID-19 infection.
The median age of participants at discharge was 57 years, and 54% (n=641) were men. Six months after initially falling ill, 68% (777/1,149) of participants reported at least one long COVID symptom. By two years after infection, reports of symptoms had fallen to 55% (650/1,190). Fatigue or muscle weakness were the symptoms most often reported and fell from 52% (593/1,151) at six months to 30% (357/1,190) at two years. Regardless of the severity of their initial illness, 89% (438/494) of participants had returned to their original work at two years.
Two years after initially falling ill, patients with COVID-19 are generally in poorer health than the general population, with 31% (351/1,127) reporting fatigue or muscle weakness and 31% (354/1,127) reporting sleep difficulties. The proportion of non-COVID-19 participants reporting these symptoms was 5% (55/1,127) and 14% (153/1,127), respectively. COVID-19 patients were also more likely to report a number of other symptoms including joint pain, palpitations, dizziness, and headaches. In quality of life questionnaires, COVID-19 patients also more often reported pain or discomfort (23% [254/1,127]) and anxiety or depression (12% [131/1,127]) than non-COVID-19 participants (5% [57/1,127] and 5% [61/1,127], respectively).
Around half of study participants (650/1,190) had symptoms of long COVID at two years, and reported lower quality of life than those without long COVID. In mental health questionnaires, 35% (228/650) reported pain or discomfort and 19% (123/650) reported anxiety or depression. The proportion of COVID-19 patients without long COVID reporting these symptoms was 10% (55/540) and 4% (19/540) at two years, respectively. Long COVID participants also more often reported problems with their mobility (5% [33/650]) or activity levels (4% [24/540]) than those without long COVID (1% [8/540] and 2% [10/540], respectively).
Mental health assessments of long COVID participants found 13% (83/650) display symptoms of anxiety and 11% (70/649) displayed symptoms of depression, while for non-long COVID participants the proportions were 3% (15/536) and 1% (5/540), respectively. Long COVID participants more often used health-care services after being discharged, with 26% (169/648) reporting an outpatient clinic visit compared to 11% (57/538) of non-long COVID participants. At 17% (107/648), hospitalisation among long COVID participants was higher than the 10% (52/538) reported by participants without long COVID.
The authors acknowledge limitations to their study. Without a control group of hospital survivors unrelated to COVID-19 infection, it is hard to determine whether observed abnormalities are specific to COVID-19. While the moderate response rate may introduce selection bias, most baseline characteristics were balanced between COVID-19 survivors who were included in the analysis and those who were not. The slightly increased proportion of participants included in the analysis who received oxygen leads to the possibility that those who did not participate in the study had fewer symptoms than those who did. This may result in an overestimate of the prevalence of long COVID symptoms. Being a single centre study from early in the pandemic, the findings may not directly extend to the long-term health outcomes of patients infected with later variants. Like most COVID-19 follow-up studies, there is also the potential for information bias when analysing self-reported health outcomes. Some outcome measures, including work status and health-care use after discharge, were not recorded at all visits, meaning only partial analysis of long-term impacts on these outcomes was possible.
NOTES TO EDITORS
This study was funded by the Chinese Academy of Medical Sciences, National Natural Science Foundation of China, National Key Research and Development Program of China, National Administration of Traditional Chinese Medicine, Major Projects of National Science and Technology on New Drug Creation and Development of Pulmonary Tuberculosis, China Evergrande Group, Jack Ma Foundation, Sino Biopharmaceutical, Ping An Insurance (Group), and New Sunshine Charity Foundation. It was conducted by researchers from the Capital medical university, China-Japan Friendship hospital, Chinese Academy of Medical Sciences, Harbin Medical University, and Tsinghua University-Peking University Joint Center for Life Sciences, China.
[1] https://www.who.int/publications/i/item/WHO-2019-nCoV-Post_COVID-19_condition-Clinical_case_definition-2021.1%5B2%5D The Lancet: 1-year outcomes in hospital survivors with COVID-19: a longitudinal cohort study, https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(21)01755-4/fulltext%5B3%5D Quote direct from author and cannot be found in the text of the Article.
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The Lancet Respiratory Medicine
Observational study
People
Health outcomes in people 2 years after surviving hospitalisation with COVID-19: a longitudinal cohort study
11-May-2022
We declare no competing interests
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