Blood clot risk remains elevated nearly a year after COVID-19 – American Heart Association News

by | Sep 19, 2022 | COVID-19

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People who got COVID-19 had a higher risk of dangerous blood clots for close to a year later, according to a large new study on the aftereffects of a SARS-CoV-2 infection during the period before vaccines became available.
As seen in previous studies, COVID-19 was linked to a sharply increased risk of blood clot-related issues – including heart attack and stroke – immediately after diagnosis compared to people who never had COVID-19. But the new study found that risk remained higher for some problems up to 49 weeks later.
At that point, the risk of deep vein thrombosis – clots that form in large veins – was nearly double in people who’d had COVID-19 compared to those who had not, according to the study published Monday in the American Heart Association journal Circulation.
The study used data collected anonymously from 48 million people – nearly every adult in England and Wales – in Great Britain’s National Health System from January 2020 until the day before COVID-19 vaccines were made available that December.
The findings reinforce the message that for people who have cardiovascular conditions, “taking established preventative medications and managing your risk factors is even more important now than it was before the pandemic,” said Jonathan Sterne, the study’s senior author and a professor of medical statistics and epidemiology at England’s University of Bristol.
The study looked at results from 1.4 million diagnoses of COVID-19, which researchers said led to an estimated 10,500 additional cases of clot-related problems.
Extensive data collection and linkage in effect across Great Br …

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