“However, we now know that besides fatigue, cognitive changes are the most common symptoms associated with long COVID.” This is not surprising as the immune system is involved across all body functions,” says A/Prof. “Long COVID is a multi-organ disease, so people are differently affected across several of their body functions. In fact, up to 100 different symptoms have been recorded as part of the long COVID disease profile. Cysique says.Ĭurrent evidence compiled by the World Health Organisation (WHO) suggests approximately 10–20 per cent of people experience a variety of mid and long-term effects after they recover from their initial illness. “These findings lay the foundation for the kynurenine pathway as a potential diagnostic and monitoring marker, as well as a possible therapeutic target,” A/Prof. The discovery opens up possibilities for identifying and treating people who are experiencing the cognitive effects of long COVID and perhaps long COVID in general. Our study speaks to the contrary, that there is a real biological mechanism behind long COVID brain fog,” A/Prof. “I think when patients go to the doctor’s with brain fog, it may be dismissed as a psychological problem. The study, published in Annals of Clinical and Translational Neurology, helps demonstrate that there is a biological change underlying brain fog in people who have long COVID as a result of mild acute COVID-19 infection. “The current study specifically found that an important metabolic pathway – the kynurenine pathway – is linked to the cognitive changes we’re seeing in this group of patients.” “Together, this study and a previous study in the ADAPT program show that long COVID brain fog is associated with a dysregulation of the immune response,” says Associate Professor Lucette Cysique, lead author of the study. Patients who took part in this study had mild to moderate acute COVID-19 and were enrolled in the St Vincent’s COVID-19 ADAPT study, a longitudinal study led by Professor Gail Matthews. They also found that these symptoms were less likely to improve over time. Scientists from the School of Psychology and Faculty of Medicine & Health found that of the study cohort of 128 people, those who had a prolonged activation of the kynurenine pathway were more likely to have mild cognitive deficits 12 months after developing COVID-19. Vincent’s Hospital have identified a key pathway, involved in inflammation, which appears to be activated in people with long COVID who have symptoms of ‘brain fog’.
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