Study demonstrates long-term neuropsychological consequences following SARS-CoV-2 infection

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes the coronavirus disease (COVID-19), causes a wide range of symptoms beyond the respiratory tract.

Many patients report many symptoms impacting the cardiovascular system and the nervous system. There is growing evidence that SARS-CoV-2 infection can include long-term neuropsychological deficits, even in its mild or moderate respiratory forms.

A team of researchers at the Clinical and Experimental Neuropsychology Laboratory, Faculty of Psychology, the University of Geneva in Switzerland, reports that SARS-CoV-2 may affect the central nervous system, particularly the limbic system responsible for behavioral and emotional responses.

The study, published in the pre-print server medRxiv*, demonstrates the presence of long-lasting neuropsychological sequelae after COVID-19, regardless of the respiratory disease's severity.

This news article was a review of a preliminary scientific report that had not undergone peer-review at the time of publication. Since its initial publication, the scientific report has now been peer reviewed and accepted for publication in a Scientific Journal. Links to the preliminary and peer-reviewed reports are available in the Sources section at the bottom of this article. View Sources

Study background

Health experts have suspected the presence of long-term neuropsychological deficits after SARS-C0V-2 infection. For instance, previous studies about the two previous coronavirus outbreaks, the severe acute respiratory syndrome (SARS) and the Middle East respiratory syndrome (MERS), demonstrated the presence of neuropsychological symptoms like sleep disorders, emotional lability, impaired concentration, frequent recall of traumatic experiences, impaired memory, and fatigue in more than 15 percent of affected patients about one month to 3.5 years following infection.

Flowchart of the study
Flowchart of the study

Further, in other diseases like the Human Immunodeficiency Virus (HIV), encephalitis, and multiple sclerosis, studies have shown specific long-term deficits in cognitive functions, including emotional responses and memory,

In COVID-19, however, there are reports of increased prevalence of stroke in patients, leading to additional short-and long-term neurological and cognitive deficits. Lastly, the sudden onset of anosmia or the loss of smell has been described as a symptom in COVID-19 patients.

This symptom happens because olfactory epithelium carries angiotensin-converting enzyme 2 (ACE2) receptors, the cellular gateway the virus uses to enter human cells. Scientists formulated that the virus may have used the nose-brain barrier for viral entry.

Mean ratings (and standard deviations) for all three groups (severe in black, moderate in gray, and mild in orange) on tasks evaluating verbal episodic memory (A1), anosognosia for memory dysfunction (B1), and multimodal emotion recognition (C1), as well as their respective predictors (A2, B2 and C2).
Mean ratings (and standard deviations) for all three groups (severe in black, moderate in gray, and mild in orange) on tasks evaluating verbal episodic memory (A1), anosognosia for memory dysfunction (B1), and multimodal emotion recognition (C1), as well as their respective predictors (A2, B2 and C2).

The study

The current study aims to determine the effect of SARS-CoV-2 infection on the brain. The team wants to investigate whether COVID-19 causes long-term neuropsychological deficits from 6 to 9 months, identify the nature of the affected domains, and know the impact of these deficits on the patient's quality of life.

The team administered standardized neuropsychological, neurological, psychiatric, and olfactory tests to 45 patients to arrive at the study findings.

The team divided the patients into three groups, according to the severity of the respiratory disease in the acute phase: severe, moderate, or mild. Severe cases were admitted in the intensive care unit with respiratory assistance, moderate cases were hospitalized without respiratory aid, and mild patients were not admitted to the hospital.

The researchers found a high prevalence of psychiatric symptoms, regardless of disease severity, in the illness's acute phase. Patients in all three groups manifested depressive symptoms, mania, anxiety, stress, apathy, post-traumatic stress disorder (PTSD), and dissociative disorders. Some patients reported insomnia, fatigue, and pathological somnolence.

When it comes to the sense of smell, 33.33 percent of the mild group, 73.33 percent of the moderate group, and 46.66 percent of the severe group have hyposmia or the partial loss of smell six to nine months after being infected. Meanwhile, of the severe group, 13.33 percent still had anosmia or the complete loss of smell.

Though the cognitive deficits reported in the three groups were common, some domains of cognition and mood were impacted differently, depending on the disease's severity. In long-term episodic memory, the severe group patients performed more poorly than the mild group. They also showed more anosognosia for memory dysfunction.

Meanwhile, the mild group was more stressed, anxious, depressed, and reported more cognitive issues. The moderate group recognized multimodal emotions less well than the mild group. All of these manifestations have impacted the patients' lives.

"At this stage, it is difficult to determine whether the cognitive deficits can be regarded as a marker of brain damage and/or should be linked to psychiatric variables that may themselves result directly from infection with SARS-CoV-2 or else be triggered by the stressful nature of the general pandemic and the individual experience of the disease," the researchers explained.

The team recommends that clinical guidelines and recommendations should be implemented in the management of long-term neurological impairment after SARS-CoV-2 infection

This news article was a review of a preliminary scientific report that had not undergone peer-review at the time of publication. Since its initial publication, the scientific report has now been peer reviewed and accepted for publication in a Scientific Journal. Links to the preliminary and peer-reviewed reports are available in the Sources section at the bottom of this article. View Sources

Journal references:
  • Preliminary scientific report. Long COVID neuropsychological deficits after severe, moderate or mild infection, P. Voruz, G. Allali, L. Benzakour, A. Nuber-Champier, M. Thomasson, I. Jacot, J. Pierce, P. Lalive, K-O. Lövblad, O. Braillard, M. Coen, J. Serratrice, J. Pugin, R. Ptak, I. Guessous, B.N. Landis, F. Assal, J.A. Péron, medRxiv, 2021.02.24.21252329; doi: https://doi.org/10.1101/2021.02.24.21252329, https://www.medrxiv.org/content/10.1101/2021.02.24.21252329v1
  • Peer reviewed and published scientific report. Voruz, Philippe, Gilles Allali, Lamyae Benzakour, Anthony Nuber-Champier, Marine Thomasson, Isabele Jacot de Alcântara, Jordan Pierce, et al. 2022. “Long COVID Neuropsychological Deficits after Severe, Moderate, or Mild Infection.” Clinical and Translational Neuroscience 6 (2): 9. https://doi.org/10.3390/ctn6020009https://www.mdpi.com/2514-183X/6/2/9.

Article Revisions

  • Apr 5 2023 - The preprint preliminary research paper that this article was based upon was accepted for publication in a peer-reviewed Scientific Journal. This article was edited accordingly to include a link to the final peer-reviewed paper, now shown in the sources section.
Angela Betsaida B. Laguipo

Written by

Angela Betsaida B. Laguipo

Angela is a nurse by profession and a writer by heart. She graduated with honors (Cum Laude) for her Bachelor of Nursing degree at the University of Baguio, Philippines. She is currently completing her Master's Degree where she specialized in Maternal and Child Nursing and worked as a clinical instructor and educator in the School of Nursing at the University of Baguio.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Laguipo, Angela. (2023, April 05). Study demonstrates long-term neuropsychological consequences following SARS-CoV-2 infection. News-Medical. Retrieved on December 23, 2024 from https://www.news-medical.net/news/20210302/Study-demonstrates-long-term-neuropsychological-consequences-following-SARS-CoV-2-infection.aspx.

  • MLA

    Laguipo, Angela. "Study demonstrates long-term neuropsychological consequences following SARS-CoV-2 infection". News-Medical. 23 December 2024. <https://www.news-medical.net/news/20210302/Study-demonstrates-long-term-neuropsychological-consequences-following-SARS-CoV-2-infection.aspx>.

  • Chicago

    Laguipo, Angela. "Study demonstrates long-term neuropsychological consequences following SARS-CoV-2 infection". News-Medical. https://www.news-medical.net/news/20210302/Study-demonstrates-long-term-neuropsychological-consequences-following-SARS-CoV-2-infection.aspx. (accessed December 23, 2024).

  • Harvard

    Laguipo, Angela. 2023. Study demonstrates long-term neuropsychological consequences following SARS-CoV-2 infection. News-Medical, viewed 23 December 2024, https://www.news-medical.net/news/20210302/Study-demonstrates-long-term-neuropsychological-consequences-following-SARS-CoV-2-infection.aspx.

Comments

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News Medical.
Post a new comment
Post

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.

You might also like...
COVID-19 linked to higher diabetes risk, vaccination reduces impact