COVID-19 Vaccination Does Not Increase Deep Vein Thrombosis Risk

Vaccination versus COVID-19 does not seem to enhance the danger of deep vein thrombosis (DVT), according to investigation offered at the 2021 American Culture of Hematology (ASH) Once-a-year Assembly.

Earlier study has revealed that vaccinations from SARS-CoV-2, the virus that results in COVID-19, which are accredited in the US are the two frequently harmless and successful. Whilst exceptional thrombotic occasions have been claimed immediately after the administration of some vaccines, no prior exploration has explicitly evaluated the causal marriage involving vaccination and DVT risk. For this analyze, researchers aimed to assess the prices of DVT prior to and following vaccination in opposition to COVID-19.

Researchers evaluated medical knowledge from individuals at minimum 18 yrs of age vaccinated towards COVID-19 between November 2020 and June 2021. All individuals experienced gained at minimum 1 dose of a vaccine approved in the US.

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All round, info from 382,527 sufferers have been provided. In this total research populace, the median client age was 61 a long time, 55.3% of people ended up male intercourse, and 64.2% had obtained the Pfizer vaccine, although 31.6% experienced gained the Moderna vaccine. Whilst 4.3% (16,272 patients) acquired the Janssen vaccine total, non-White people were more likely to acquire Janssen (21%).

In the general population, 5960 people underwent 7265 higher and reduced DVT venous duplex ultrasounds in the 90 times before and just after vaccination. Acute DVT was pointed out by a all-natural language processing algorithm in 714 clients (11.1% of ultrasounds in general). This corresponded to an overall acute DVT price of 1.86 for every 1000 people, which the researchers observed accorded with the history epidemiologic price.

Evaluation suggested that there was no correlation among the chance of DVT and regardless of whether ultrasound took spot prior to or soon after COVID-19 vaccination. Acute DVT happened in 10.8% of ultrasounds soon after vaccination in contrast with 11.6% prior to vaccination (P =.28).

While no variations ended up pointed out for the Moderna and Pfizer vaccines, people who underwent ultrasound who received the Janssen vaccine have been additional likely to have a DVT in advance of vaccination (18%) instead than soon after (7% P =.0003). The presenter suggested that this finding may well be owing to more than-tests amongst patients who been given Janssen.

Disclosure: The research author(s) declared affiliations with biotech, pharmaceutical, and/or gadget providers. You should see the unique reference for a complete checklist of authors’ disclosures.

Examine additional of Hematology Advisor‘s protection of the ASH 2021 meeting by visiting the conference webpage.


Houghton DE, Padmanabhan A, Ashrani AA, et al. Deep vein thrombosis after COVID-19 vaccinations. Introduced at ASH 2021 December 11-14, 2021. Summary 291.

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