Why do some people have symptoms of COVID-19 long after they are cured?

A new study conducted by researchers at National Jewish Health (United States) and published in the scientific journal ‘American Journal of Respiratory and Critical Care Medicine’ has shed light on the cause of symptoms of persistent COVID-19 that could help experts. to start developing treatments.

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“There is no common characteristic among those who experience the post-covid syndrome. We see patients young and old, with mild and severe cases of COVID-19, active and healthy, as well as some with pre-existing conditions. Some have subtle symptoms, while others experience very obvious health problems that are life-altering and l. For most, initial tests of their heart and lungs were normal, so we looked deeper at the cellular level.”, says Dr. Irina Petrache, co-author of the study.

To do this, the researchers conducted exercise tests controlling hundreds of data points as patients fatigued on a stationary bike. The patients wore a specialized mask and electrodes that monitored their breathing and heart function, and in some patients an arterial line was also inserted to monitor blood oxygen levels.

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They concluded that the mitochondria (microorganisms in cells responsible for generating energy) Although the test revealed this dysfunction in muscle tissue, the researchers believe that this same process is related to symptoms that originate in the pulmonary and neurological systems too.

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