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Post-COVID-19 Syndrome.

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    Post-COVID-19 syndrome, or long COVID, involves complex pathophysiology including virus-specific variations, oxidative stress, immune dysfunction, and inflammation. Further research is crucial to understand its mechanisms and long-term effects.

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    Area of Science:

    • Medical Research
    • Virology
    • Immunology

    Background:

    • Post-COVID-19 syndrome, characterized by persistent symptoms beyond 4 weeks, affects individuals regardless of initial COVID-19 severity.
    • While lung damage is expected from SARS-CoV-2, multi-organ involvement and diverse symptoms are increasingly reported.
    • Limited literature currently exists on the underlying pathophysiological mechanisms of this syndrome.

    Purpose of the Study:

    • To conduct an integrative review summarizing and evaluating the biological underpinnings of post-COVID-19 syndrome.
    • To consolidate current knowledge on the pathophysiology of long COVID.

    Main Methods:

    • An integrative literature review was performed using Whittemore and Knafl's methodology.
    • Searches were conducted in PubMed, CINAHL, and Web of Science for articles published up to August 30, 2021.
    • Keywords included "post-COVID-19 syndrome," "long COVID," and "pathophysiology."

    Main Results:

    • The review analyzed 54 articles focusing on the pathophysiology of post-COVID-19 syndrome.
    • Four primary pathophysiological categories were identified: virus-specific variations, oxidative stress, immunologic abnormalities, and inflammatory damage.
    • These factors contribute to the complex symptomology observed in long COVID patients.

    Conclusions:

    • Post-COVID-19 syndrome is a complex, multifactorial condition with emerging evidence pointing to virus-specific mechanisms, oxidative stress, immune system dysfunction, and inflammation.
    • Further research is essential to fully elucidate the pathophysiology, pathogenesis, and long-term consequences of post-COVID-19 syndrome.