1- Deputy of Research and Technology, Guilan University of Medical Sciences, Rasht, Iran.
2- Department of Immunology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
3- Department of Neurology, Poursina Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
Abstract:
Introduction: In this systematic review, we will discuss the change of stroke incidence during the COVID-19 pandemic period and the proposed mechanisms of the relationship between SARS-CoV-2 and stroke.
Methods: Web of Science, PMC/Medline, and Scopus databases were searched until July 2020 without time and language limitations. After quality assessment, 22 articles were included in this study.
Results: Based on the results, it is impossible to conclude any definite relationship between the rising or decreasing stroke frequency or the shift in the ischemic and hemorrhagic ratio and SARS-CoV-2 infection. However, it appears that SARS-CoV-2 infection has some correlation with stroke. The supposed mechanisms for the SARS-CoV-2-related hemorrhagic stroke include 1) SARS-CoV-2-related vasculopathy with the endothelial damage of small vessels, 2) viral infection-induced platelet dysfunction or thrombocytopenia, and 3) activation of the proinflammatory cascade leading to coagulopathy. The helpful strategies are receiving therapeutic anticoagulation for high D-dimer or a known thrombus due to SARS-CoV-2 infection, as well as using extracorporeal membrane oxygenation (ECMO) in some patients. Furthermore, the possible mechanisms for the SARS-CoV-2-related ischemic stroke include 1) dysregulation of angiotensin-converting enzyme 2 (a key host cellular receptor for SARS-CoV-2)-related physiologic functions, 2) endothelial cell damages, 3) thrombo-inflammation, and 4) coagulopathy and coagulation abnormalities related to SARS-CoV-2 infection.
Conclusion: A better understanding of the SARS-CoV-2 pathogenesis and its relation to neurologic abnormalities such as stroke can help to design new therapeutic approaches.
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● According to our study, there is not a definite relationship between COVID-19 and stroke incidence.
● It appears that the ratio of the hemorrhagic stroke to ischemic stroke has enhanced, which may be due to the COVID-19.
● The frequency of thrombotic reactions due to the severe SARS-CoV-2 infection is seem to be increased.
Plain Language Summary
Since the onset of the COVID-19 pandemic, many case-report studies have shown that severe or critically ill COVID-19 can lead to thrombotic disorders and stroke. It seems that a relationship exists between COVID-19 and stroke in human societies, and accordingly, in the present study we have tried to provide a comprehensive and systematic review for this global concern. Based on our findings in a limited timeline and according to our knowledge, there is not necessarily a clear correlation between COVID-19 and the stroke prevalence, but this relationship is likely to exist. Also, in the present study we have described the supposed mechanisms for SARS-CoV-2-related stroke in a detail. It appears that the SARS-CoV-2 infection causes coagulation abnormalities, vascular damage and progression of inflammatory cascades leading to a stroke and multi-organ injury. Consequently, for the better understanding, further studies in this context are required.
Type of Study:
Review |
Subject:
Clinical Neuroscience Received: 2021/03/9 | Accepted: 2021/07/24 | Published: 2021/09/1