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  • 1.
    Björsell, Tove
    et al.
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine. Department of Infectious Diseases, Karlstad Hospital, Karlstad, Sweden; Centre for Clinical Research and Education, Region Värmland, Karlstad, Sweden.
    Sundh, Josefin
    Department of Respiratory Medicine, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
    Lange, Anna
    Department of Infectious Diseases, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
    Ahlm, Clas
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Forsell, Mattias N. E.
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Tevell, Staffan
    Department of Infectious Diseases, Karlstad Hospital, Karlstad, Sweden; Centre for Clinical Research and Education, Region Värmland, Karlstad, Sweden; Faculty of Medicine and Health, School of Medical Sciences, Örebro University, Örebro, Sweden.
    Blomberg, Anders
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine.
    Edin, Alicia
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Anaesthesiology.
    Normark, Johan
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology. Umeå University, Faculty of Medicine, Wallenberg Centre for Molecular Medicine at Umeå University (WCMM).
    Cajander, Sara
    Department of Infectious Diseases, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
    Risk factors for impaired respiratory function post COVID-19: a prospective cohort study of nonhospitalized and hospitalized patients2023In: Journal of Internal Medicine, ISSN 0954-6820, E-ISSN 1365-2796, Vol. 293, no 5, p. 600-614Article in journal (Refereed)
    Abstract [en]

    Background: Severe COVID-19 increases the risk for long-term respiratory impairment, but data after mild COVID-19 are scarce. Our aims were to determine risk factors for reduced respiratory function 3–6 months after COVID-19 infection and to investigate if reduced respiratory function would relate to impairment of exercise performance and breathlessness. Methods: Patients with COVID-19 were enrolled at the University Hospitals of Umeå and Örebro, and Karlstad Central Hospital, Sweden. Disease severity was defined as mild (nonhospitalized), moderate (hospitalized with or without oxygen treatment), and severe (intensive care). Spirometry, including diffusion capacity (DLCO), was performed 3–6 months after hospital discharge or study enrollment (for nonhospitalized patients). Breathlessness (defined as ≥1 according to the modified Medical Research Council scale) and functional exercise capacity (1-min sit-to-stand test; 1-MSTST) were assessed. Results: Between April 2020 and May 2021, 337 patients were enrolled in the study. Forced vital capacity and DLCO were significantly lower in patients with severe COVID-19. Among hospitalized patients, 20% had reduced DLCO, versus 4% in nonhospitalized. Breathlessness was found in 40.6% of the participants and was associated with impaired DLCO. A pathological desaturation or heart rate response was observed in 17% of participants during the 1-MSTST. However, this response was not associated with reduced DLCO. Conclusion: Reduced DLCO was the major respiratory impairment 3–6 months following COVID-19, with hospitalization as the most important risk factor. The lack of association between impaired DLCO and pathological physiological responses to exertion suggests that these physiological responses are not primarily related to decreased lung function.

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  • 2.
    Normark, Johan
    et al.
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Immunology/Immunchemistry.
    Vikström, Linnea
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Yong-Dae, Gwon
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Section of Virology.
    Persson, Ida-Lisa
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Edin, Alicia
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Björsell, Tove
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Dernstedt, Andy
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Christ, Wanda
    Tevell, Staffan
    Evander, Magnus
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology, Section of Virology.
    Klingström, Jonas
    Ahlm, Clas
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Forsell, Mattias N. E.
    Umeå University, Faculty of Medicine, Department of Clinical Microbiology.
    Heterologous ChAdOx1 nCoV-19 and mRNA-1273 Vaccination2021In: New England Journal of Medicine, ISSN 0028-4793, E-ISSN 1533-4406, Vol. 385, no 11, p. 1049-1051Article in journal (Refereed)
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