POST-COVID SYNDROME
Abstract
Many COVID-19 survivors experience a variety of persistent symptoms that last for months or years. The prevalence of the consequences of COVID-19 is estimated at 10–30%. This multifactorial clinical syndrome is called PACS (post-acute COVID syndrome) or “long COVID”. Post-COVID syndrome is characterized by changes in the immune, cardiovascular, gastrointestinal, nervous and autonomic systems, making it similar to myalgic encephalitis/chronic fatigue syndrome (ME/CFS). The current lack of effective treatment reflects the unclear causes of post-COVID-19 conditions, which cannot be adequately addressed until the pathophysiological mechanism is established. The COVID-19 pandemic has exposed a significant gap in knowledge about the long-term consequences of infectious diseases. Unraveling the complex biology of PACS relies on identifying biomarkers and phenotypes of patients who developed PACS. Comprehensive longitudinal monitoring of symptoms is necessary to confirm the diagnosis, identify mechanisms, and develop prevention and treatment measures for PACS. Complications that persist for months and years after recovery from acute COVID-19 occur in many organ systems, not just the respiratory tract, and vary in both location and severity. “Long COVID” represents a number of different post-viral syndromes that require appropriate classification. The inappropriate and unique inflammatory response during the acute phase of COVID-19 causes severe respiratory symptoms, which can further lead to damage to multiple organs such as the brain, heart, and kidneys. The role of an unregulated antigen-specific immune response to infection with the SARS-CoV-2 coronavirus, persistence of the virus in tissue reservoirs, unresolved inflammation, hyperproduction of cytokines and tissue damage in the processes and development of post-COVID syndrome is considered.
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