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Mysterious Blood Clots in COVID-19 Patients Have Doctors Alarmed

Mysterious Blood Clots in COVID-19 Patients Have Doctors Alarmed
04/23/2020
livescience.com

livescience.com

Some hospitals are putting all COVID-19 patients on low doses of blood thinners.

As doctors learn more about what makes COVID-19 so severe for some patients, they have discovered a mysterious and potentially lethal complication of the disease: blood clots.

Many doctors have reported seeing an alarming number of COVID-19 patients with blood clots — gel-like clumps in the blood that can cause serious problems, such as heart attack and stroke, according to news reports.

"The number of clotting problems I'm seeing in the ICU [intensive care unit], all related to COVID-19, is unprecedented," Dr. Jeffrey Laurence, a hematologist at Weill Cornell Medicine in New York City, told CNN.

Some doctors started to notice that their COVID-19 patients were developing clots in their legs, even while they were on blood thinners, according to The Washington Post. Others reported trouble with dialysis machines for COVID-19 patients, because clots in the patients' blood would clog the machine tubing, according to CNN.

In addition, some COVID-19 autopsies have found tiny blood clots throughout the lungs, the Post reported.

Reports are also surfacing of relatively young people, in their 30's and 40's, who are having strokes after being infected with the new coronavirus, according to CNN. It's known that strokes are often caused by blot clots that break free and travel to vessels in the brain.

The link between COVID-19 and clots has led some hospitals to put all COVID-19 patients on low doses of blood thinners to prevent clots, according to CNN.

It's not uncommon for patients in the ICU to experience blood clots, but the level of clotting with COVID-19 does appear out of the ordinary, CNN reported. A recent study from the Netherlands, published in the journal Thrombosis Research, found that out of 184 COVID-19 patients in the ICU, more than 30% experienced some type of clotting issue. This number is "alarming," Dr. Behnood Bikdeli, cardiovascular medicine fellow at Columbia University Irving Medical Center, told CNN.

Given that COVID-19 is a respiratory illness, doctors expected the most serious effects to be in the lungs, not the blood. It's still unclear why COVID-19 patients are experiencing these clots.

The clots could be the result of an overactive immune system, which leads to an imbalance in "clotting factors" that can cause clotting or bleeding, the Post reported.

But doctors note that many COVID-19 patients in the ICU also have other risk factors for blood clots, such as diabetes, heart disease, and high blood pressure, according to CNN.

Doctors say there is an urgent need to study this issue and whether blood thinners can help COVID-19 patients, CNN reported. 

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