Researchers found blood clots and vessel damage in the autopsied lungs of people killed by the disease.
Researchers who examined the lungs of patients killed by covid-19 found evidence that it attacks the lining of blood vessels there, a critical difference from the lungs of people who died of the flu, according to a report published Thursday in the New England Journal of Medicine.also suffered many microscopic blood clots and appeared to respond to the attack by growing tiny new blood vessels, the researchers reported.
In larger blood vessels of the lungs, the number of blood clots was similar among covid-19 and flu patients, the researchers wrote. But in covid-19 patients, they found nine times as many micro-clots in the tiny capillaries of the small air sacs that allow oxygen to pass into the blood stream and carbon dioxide to move out. The virus may have damaged the walls of those capillaries and blocked the movement of those gases, the researchers wrote.
Most surprising was evidence that the lungs of people attacked by the SARS-CoV-2 virus grew new blood vessels.“The lungs from patients with covid-19 had significant new vessel growth,” the researchers wrote, a discovery they described as “unexpected.” In an interview, Mentzer speculated that may have been an attempt by the lungs to pass more oxygen to hypoxic tissue.
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