Exploring the Link Between COVID-19 and Increased Stroke Severity Risk

Impact of COVID-19 on Stroke Outcomes

Increased Incidence and Mortality Rates

Recent findings indicate that patients with COVID-19 who suffer from strokes experience significantly worse outcomes, including elevated mortality rates. A study published in the journal Stroke examined patients with COVID-19 and acute ischemic stroke, comparing their health outcomes to those of patients experiencing strokes without the virus.

Study Overview

The researchers evaluated clinical data from 174 patients diagnosed with both COVID-19 and acute ischemic stroke. These patients were meticulously matched with non-COVID-19 stroke patients based on several key factors, including age, gender, and various stroke risk factors. The identified risk factors included hypertension, diabetes, heart disease, coronary artery disease, cancer, prior strokes, smoking, obesity, and dyslipidemia (elevated triglycerides or cholesterol levels).

The study encompassed a total of 330 patients across 28 healthcare centers in 16 countries. For comparison, data from non-COVID-19 patients were sourced from the ASTRAL (Acute Stroke Registry and Analysis of Lausanne) Registry, covering the years 2003 to 2019.

Clinical Outcomes

To evaluate stroke severity and outcomes, the researchers utilized the National Institute of Health Stroke Scale (NIHSS). The comparison between the two patient groups revealed:

– Patients with COVID-19 experienced more severe strokes, evidenced by a median NIHSS score of 10, compared to 6 for non-COVID-19 patients.
– After the stroke, COVID-19 patients reported greater disability, reflected in a median Rankin score of 4, whereas non-COVID-19 patients had a median Rankin score of 2 (the Rankin score measures disability resulting from a stroke).
– The likelihood of mortality for COVID-19 patients with strokes was 4.3 times higher than that of patients who had strokes alone.

Underlying Causes of Increased Mortality and Disability

Researchers propose that the heightened risk of mortality and disability in COVID-19 patients may stem from the body’s immune response to the virus, along with factors like dehydration and cardiac arrhythmias. These responses could facilitate the formation of blood clots within blood vessels, thereby increasing the risk of stroke.

Additionally, the study highlights that the more severe strokes experienced by COVID-19 patients upon admission may contribute to the poorer outcomes. The authors note, “The broad multi-system complications of COVID-19 including acute respiratory distress syndrome, cardiac arrhythmias, acute cardiac injury, shock, pulmonary embolism, cytokine release syndrome and secondary infection probably contribute further to the worse outcomes including higher mortality in these patients.”

Conclusion

This research underscores the urgent need for a deeper understanding of the mechanisms linking COVID-19 to increased stroke severity. Enhanced awareness and improved treatment strategies are essential for managing these patients effectively during the current pandemic and in potential future health crises.

Author Information

Written by Bhavana Achary, Ph.D.

References

Ntaios G, Michel P, Georgiopoulos G, et al. Characteristics and Outcomes in Patients With COVID-19 and Acute Ischemic Stroke: The Global COVID-19 Stroke Registry. Stroke. 2020;10.1161/STROKEAHA.120.031208

Press release: Eureka Alert

Image by Gerd Altmann from Pixabay.