- Phillippa Rockby
- health reporter
image source, Getty Images
A Swedish study shows that those who have recovered from COVID-19 are at an increased risk of developing thromboembolism for up to six months.
This research found People with severe coronavirus symptoms and those who were infected during the first wave of outbreaks have the highest risk of thrombosis
The researchers stated that This demonstrates the importance of vaccinating against COVID-19.
One major UK study found that even after vaccination there is still a chance of developing blood clots. But the risks are much less.
People who have been infected with COVID-19 are more likely to develop thrombosis especially in patients who need to be admitted to the hospital Scientists want to find out if When will this risk fall to normal levels?
Researchers tracked the health of more than 1 million people diagnosed with coronavirus between Feb 2020 and May 2021 in Sweden, and compared that to 4 million people in the same age and sex group who were diagnosed with coronavirus. never found to be infected before
After contracting the coronavirus, they were found to be at higher risk in several areas, including:
- Deep Vein Thrombosis–DVT
- Sick of pulmonary embolism for up to 6 months
- Bleeding within the body, such as cerebrovascular disease, for up to 2 months
When researchers compared thromboembolic risk After recovering from covid infection At normal risk levels, they found that:
- Four out of every 10,000 COVID patients develop deep vein thrombosis. For those who are not infected with the coronavirus, the ratio is 1 in 10,000.
- About 17 out of every 10,000 COVID patients develop pulmonary embolism. The percentage of people who are not infected with coronavirus is less than 1 in 10,000.
The study, published in the journal BMJ, shows that thromboembolic events are at a higher risk in the first wave of coronavirus patients than any subsequent wave, likely because Treatments developed during the pandemic and elderly patients began to be vaccinated during the second wave of outbreaks.
should get vaccinated
The risk of developing pulmonary embolism in people with severe coronavirus disease is 290 times higher than in the general population. This risk was 7 times higher than normal, but there was no increased risk of internal bleeding.
“For those who are not vaccinated That is a good reason to get vaccinated. This risk is much higher than the risk from vaccination,” said Anne-Marie Forsconnolly, chief investigator of the study at Umea University in Sweden.
The researchers were unable to prove that Covid caused thromboembolism in this study. But they have several theories as to why thrombosis occurs.
It may be a direct effect of the virus on the cell layer in the blood vessels. Severe inflammatory response after viral infection or the body creates blood clots at inappropriate times
Vaccines have been very effective in preventing severe cases of coronavirus. But the prevention of infection has decreased. especially the omikron mutant It is normal for re-infections to occur. As many countries are searching for ways to live with COVID
Frederic K. Ho, professor of public health at the University of Glasgow, said the study “reminds us of the need to be on the lookout for serious complications associated with infection. [โควิด] even with mild symptoms including thrombosis and occlusion of blood vessels
He added that The risk of thromboembolism was higher after vaccination, but the “risk size It is still less and still has a shorter duration than the risk of infection.”