New findings suggest there might be a connection between Covid-related loss of smell and cognitive impairment, but experts say more research is needed.
has found that some Covid patients go on to develop cognitive impairment after their infection. In the new study — which has not been published in a peer-reviewed journal — researchers in Argentina found that loss of smell during Covid may be a stronger predictor of cognitive decline, regardless of severity of disease.
The researchers did not have hard data on the state of cognitive function of the patients before contracting Covid in order to compare with the findings at the end, but they did ask participants’ families about their cognitive function before infection and did not include people who had clear cognitive impairment before the study.
Using data from Rush University’s Memory and Aging Project, the researchers tracked loss of smell in 515 older adults over 22 years. They also measuredThey found that people whose sense of smell declined faster over time ended up with smaller amounts of gray matter in both of these regions of the brain. The same was not true of parts of the brain tied to vision, suggesting sense of smell has a unique link to cognition in terms of structural differences.
“There are a number of other ways in which these two things can be related. The cause may be a pathology that is unrelated to the Covid effect,” he said.
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