A new scoring system helped predict stroke risk in adults hospitalized with COVID-19 and was comparable to a computer-based risk estimator, according to preliminary research presented at the American Stroke Association’s International Stroke Conference 2022.

As the science community continues to learn more about COVID-19, some evidence suggests that people with a COVID-19 infection have an increased risk of stroke and worse stroke outcomes.

Researchers developed a scoring system using information from the American Heart Association’s COVID-19 Registry, a nationwide collection of health data on COVID-19 treatment and cardiovascular disease risk factors for people hospitalized with COVID-19. In addition to patients’ age, race and ethnicity, the registry includes other medical conditions, medications, and vital signs and lab values at admission.

Based on the health data from the registry, the researchers identified six clinical factors that helped predict the risk of stroke. These factors included: 1) history of stroke; 2) no fever at the time of hospital admission; 3) no history of pulmonary disease; 4) high white blood cell count; 5) history of high blood pressure; and 6) high systolic blood pressure at the time of hospital admission.

“Of the six factors linked to increased risk of stroke, one was ‘no history of pulmonary disease’ and another was ‘no fever.’ This seemed a bit surprising because patients with lung disease and those with high fever are at higher risk to develop severe COVID-19,” said Alexander E. Merkler, MD, MS, lead study author and an assistant professor of neurology at Weill Cornell Medical College/New York Presbyterian Hospital in New York City.

The study examined registry data for about 21,420 adults hospitalized with COVID-19 at 122 healthcare centers in the US between March 2020 – March 2021. Patients’ average age was 61, and 54% were men. More than one-third of participants were white adults, about one-quarter were Black adults and one-quarter were Hispanic adults; the racial or ethnic group for the remaining 10% of study participants was either Asian, unknown or not identified in the records.

Overall, 1 in 65 adults hospitalized with COVID-19 had a stroke. Registry patients with four or more of the clinical risk factors were more than 10 times as likely to have a stroke compared to those with fewer factors. To verify the accuracy of the scoring system, the results were compared to a computer method based on artificial intelligence. The clinical scoring system predicted the risk of stroke as accurately as the computer method.

“This clinical risk score may help professionals better understand which patients with COVID-19 are at increased risk for stroke, and, therefore, monitor them more closely and provide treatment more quickly,” Merkler said. “Future research could focus on specific treatments that may benefit people with COVID-19 who are at higher risk for stroke.”