COVIDrelated

medicine

School of Medicine review proposes treatments for COVID-related blood clots

Yale News

Scientists at Yale have synthesized research from around the world to suggest new treatment methods for COVID-19.

A multidisciplinary team of Yale physician scientists, researchers, nursing staff and others have collaborated since early on in the pandemic to figure out why COVID-19 patients are so prone to blood-clotting. Their recent review, published on Nov. 19 in Nature Reviews Cardiology, details how COVID-19 causes blood clots in sick patients and why the disease has been so difficult to treat.

“Blood clotting is a complex process that involves many types of cells in the body including platelets and endothelial cells,” John Hwa, professor of medicine at the Yale Cardiovascular Research Center and one of the review’s senior authors, wrote in an email to the News. “It isn’t often that all components involved are in serious disarray and thus synergizing to promote massive blood clotting. In some ways it’s like ‘a perfect storm’ where all the components are perturbed and are tipped over the edge by COVID-19.”

Hwa said his colleague Hyung Chun, co-author of the review and director of Translational Research at the Yale Pulmonary Vascular Disease Program, contacted him in March when he suspected that endothelial cells, which line the interior surface of blood vessels, might be involved in the pathogenesis of COVID-19. 

Alfred Lee, associate professor of Medicine and another author of the review, also reached out to Hwa in March and informed him of potential abnormalities in platelets — cells responsible for blood clotting — that he was observing in COVID-19 patients. The team, which included Lee, Hwa and Chun, expanded those observations into a massive collaborative effort that included many frontline healthcare workers helping with patient treatment.

Platelets and endothelial cells are not usually considered important in the development of a disease from viral infection, according to Hwa. But COVID-19 and the body’s resulting immune response can lead to damage in many different cells and cause a wide range of complications — including those related to platelets and endothelial cells.

“A major adverse outcome of those critically ill with Covid19 is formation of blood clots, many of which are likely undiagnosed,” Chun wrote in an email to the News. “This is likely occurring due to a combination of endothelial injury/activation and platelet activation.”

To make matters worse, the functions of these cells can already be compromised in elderly people and in people with diabetes or other cardiovascular risk factors. Then, when the cells are introduced to COVID-19, the “perfect storm” that Hwa described forms. 

Another complication can come in the form of elevated cytokine levels, according to Jennifer Kwan, co-author of the review and clinical fellow at the Yale School of Medicine.

“The cytokines are essentially our messaging system released by immune cells to ramp up the immune defense or offense against a microbial threat,” Kwan said. “But when

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health

Montgomery County adds 3 COVID-related deaths as total now 154

Montgomery County COVID-19 cases pushed passed 14,000 Thursday as public health officials confirmed three more deaths related to the virus.

The total number of cases is now 14,076. To date, 8,905 people have fully recovered.

According to the Montgomery County Public Health District, the county added 19 to its active case count to bring the total to 2,320. The reason for the difference in the new cases and active cases is the health district is continuing to process cases that were reported to The Department of State Health Services directly by health care providers and entered into the National Electronic Disease Surveillance System.

The deaths include a Spring man in his 50s who died at home; a Montgomery man in his 70s who was hospitalized at the time of his death; and a Magnolia man in his 70s who was also hospitalized at the time of his death. All three men had other health conditions in addition to testing positive for COVID-19.

The three deaths bring the county’s total to 154.


As for total hospitalizations, both county and noncounty residents, those totals increased by three to 68 with 20 of those patients in critical care beds.

Online registration is still available for COVID-19 testing in Montgomery County. To get a voucher, go to mchd-tx.org or mcphd-tx.org and click on the “need to be tested” link. Fill out the information. A voucher will be emailed. Once you have the voucher, make an appointment at your choice of testing centers and get tested.

Call the MCHD/MCPHD COVID-19 Call Center at 936-523-3916 for more information.

[email protected]

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health

Montgomery County records its 145th COVID-related death

Montgomery County public health officials confirmed the county’s 145th COVID-19-related death Tuesday as the case total passed 13,000.

According to the Montgomery County Public Health District, the death was a Porter man in his 60s who was hospitalized at the time of his death. The man had other health conditions in addition to testing positive for the virus.

The county added 95 cases Tuesday, bringing the total to 13,086. Of those, 1,945 are active, a drop of 85 from the previous day.

Total hospitalizations, both county and noncounty residents, dropped by seven to 54 with 14 of those patients in ICU.


The reason for the difference in the new cases and active cases is the Montgomery County Public Health District is continuing to process cases that were reported to The Department of State Health Services directly by health care providers and entered into the National Electronic Disease Surveillance System.

Online registration is still available for COVID-19 testing in Montgomery County. To get a voucher, go to mchd-tx.org or mcphd-tx.org and click on the “need to be tested” link. Fill out the information. A voucher will be emailed. Once you have the voucher, make an appointment at your choice of testing centers and get tested.

The county’s COVID-19 call center is available at 936-523-3916.

[email protected]

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