COVID-19 infection increases the risk of potentially life-threatening blood clots by at least 49 weeks, according to a new study of the health records of 48 million unvaccinated adults from the first wave of the pandemic.
MEDİMAGAZİN – Researchers studied unidentified electronic health records across the entire population of England and Wales from January to December 2020 to compare the risk of blood clots after COVID-19 with the risk at other times.
In the first week after being diagnosed with COVID-19, people were 21 times more likely to have a heart attack or stroke.
The researchers also studied conditions caused by blood clots in the veins:
These include deep vein thrombosis and pulmonary embolism. In the first week after COVID-19 diagnosis, the risk of blood clots in the veins was 33 times higher. This fell into 8 times higher risk after 4 weeks.
The high risk of blood clots post-COVID-19 persisted throughout the study period, but between 26 and 49 weeks the probability of clots decreased to 1.3 times and the probability of clots in the veins to 1.8 times.
Research, Circulation published in the magazine