J Neurol Res
Journal of Neurology Research, ISSN 1923-2845 print, 1923-2853 online, Open Access
Article copyright, the authors; Journal compilation copyright, J Neurol Res and Elmer Press Inc
Journal website https://www.neurores.org


Volume 11, Number 5, October 2021, pages 69-76

Cerebral Coagulation Complications Following COVID-19 Adenoviral Vector Vaccines: A Systematic Review

Sara Aghabakloua, Seyed-Mostafa Razavib, Pegah Mohammadic, Sharareh Gholamind, Ashkan Mowlae, f

aDepartment of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
bHeart and Rhythm Clinic, San Jose, CA, USA
cDepartment of Medicine, Eisenhower Medical Center, Rancho Mirage, CA, USA
dDepartment of Biology and Bioengineering at California Institute of Technology, Pasadena, CA, USA
eDepartment of Neurological Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
fCorresponding Author: Ashkan Mowla, Division of Endovascular Neurosurgery, Department of Neurological Surgery, Keck School of Medicine, University of Southern California (USC), Suite 3300, 1200 North State St., Los Angeles, CA 90033, USA

Manuscript submitted July 26, 2021, accepted September 2, 2021, published online October 5, 2021
Short title: CVST After COVID-19 Vaccination
doi: https://doi.org/10.14740/jnr700


Emergence of the novel coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) outbreak identified in late 2019 in Wuhan, China, was declared a pandemic in March 2020. High fatality rate in afflicted patients prompted scientists and physicians to develop various vaccines against the virus. While administration of millions of doses of the adenoviral vector vaccines (e.g., Oxford-AstraZeneca (ChAdOx1 nCoV-19) and Janssen/Johnson & Johnson (Ad26.COV2. S)) has helped control the disease, numerous cases of cerebral venous sinus thrombosis (CVST) with thrombocytopenia have been reported in vaccinated individuals. In this article, we aim to review the cases reported thus far and further discuss the association between the vaccine administration and subsequent cerebral thromboembolic events. Our study was performed and reported based on the guidelines outlined in the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). PubMed, Google Scholar and Norris Medical Library databases were searched using the following terms: coronavirus disease 2019 (COVID-19) vaccines (“AstraZeneca” or “AZD1222 COVID vaccine” or “ChAdOx1 nCoV-19 COVID-19 vaccine” or “Janssen” or “Johnson & Johnson COVID vaccine” or “Ad26.COV2 COVID vaccine”), coagulopathy (“cerebral venous sinus thrombosis (CVST)” and “vaccine-induced immune thrombotic thrombocytopenia (VITT)” or “cerebral venous thrombosis (CVT)”) and thrombocytopenia. All the relevant studies within the English literature up to August 1, 2021, were included. Fourteen most recent articles reporting on 66 patients with CVST and VITT after adenoviral vector vaccination were reviewed by two independent authors. Age of the patients ranged from 18 to 60 years. The majority of cases were women (43 females versus 14 males). Platelet count was between 5 and 127 × 109/L. Above-normal D-dimer was found in 86% of the patients. A total of 68% of the patients had positive platelet factor 4 IgG assay in the absence of prior exposure to heparin. Among CVST cases following COVID vaccination, 44% succumbed to death. Early diagnosis and treatment of CVST plays a fundamental role in decreasing morbidity and mortality. Health care professional should be familiar with this rare complication post vaccination against COVID-19. Given the rarity of CVST after the COVID-19 vaccine, the benefit of vaccination outweighs the potential harm.

Keywords: COVID-19; Adenoviral vector vaccines; AstraZeneca; AZD1222 COVID vaccine; Johnson & Johnson COVID vaccine; Coagulopathy; Thrombocytopenia; Cerebral venous sinus thrombosis


Coronavirus disease 2019 (COVID-19) virus

The novel coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), identified in late 2019 in Wuhan, China, spread rapidly around the globe and was announced a pandemic on March 11, 2020 [1]. The single stranded positive sense ribonucleic acid (RNA) virus, SARS-CoV-2 [2, 3] spreads through droplet and is associated with a wide range of clinical complications, from fever, cough, muscle or body aches, loss of taste or smell to more severe consequences such as pneumonia, organ failure, acute respiratory distress syndrome, acute kidney injury, and thromboembolic events (e.g., venous thromboembolism, pulmonary embolism, deep vein thrombosis, stroke, myocardial infarction, and limb artery thrombosis) [4]. Severe clinical complications have been found in more advanced cases, especially in intensive care unit patients. The underlying mechanism through which SARS-CoV-2 exerts its effect on different organs of the human body is not well understood; however, aftermaths of cytokine storm and thromboembolic associated disorders are the main culprits in developing fatality and long-lasting disorders [2, 5-7].


After significant efforts across the world to develop effective vaccines and therapeutic modalities, two categories of vaccines have been emerged with promising response against the coronavirus that encode the spike protein of SARS-CoV-2: mRNA-based vaccines such as BNT162b2 (Pfizer-BioNTech) and mRNA-1273 (Moderna), and adenoviral vector vaccines such as ChAdOx1 nCoV-19 (Vaxzevria, previously Oxford-AstraZeneca) and Ad26.COV2.S (Janssen-Johnson & Johnson) [8, 9].

Vaccine complications

More than 2 billion doses of the vaccines against COVID-19 were administered worldwide by June2021, resulting in reduced number of severe cases and mortality [10]. Similar to other vaccines, the COVID-19 vaccine can cause benign complications such as headache, fever, diarrhea, and pain at the injection site. Aside from these benign symptoms, days after starting vaccination with Vaxzevria, and at the same time after Janssen-Johnson & Johnson vaccination, numerous cases of thromboembolic events, e.g., cerebral venous sinus thrombosis (CVST) with low platelet counts were reported, particularly in Europe [8, 10-12].

On April 4, 2021, European Medicines Agency (EMA)’s safety committee Pandemic Response Accountability Committee announced that 169 cases of CVST and 53 cases of superficial vein thrombosis have been reported after administration of the Oxford-AstraZeneca vaccine [13]. On April 7, 2021, EMA Pharmacovigilance Risk Assessment Committee (PRAC) stated that there may be a relationship between vaccination with Vaxzevria and thrombosis with thrombocytopenia (TTS) within the cerebral venous sinus [10]. The US Food and Drug Administration (FDA) recommended a temporary pause in the use of the Janssen-Johnson & Johnson vaccines on April 12, 2021, after six cases of CVST with thrombocytopenia were pointed out within approximately 7 million vaccinated individuals in the USA [10, 14]. After reviewing the data on TTS cases, the Advisory Committee on Immunization Practices of Centers for Disease Control and Prevention (CDC) recommended that the Johnson & Johnson vaccination can be reinstated [11, 14]. European countries also resumed Vaxzevria vaccination, although some of these countries restricted its use by age [10].

Thrombosis associated with thrombocytopenia after vaccination has been named vaccine-induced prothrombotic immune thrombocytopenia or vaccine-induced immune thrombotic thrombocytopenia (VITT), collectively designated as VITT in the current review. Thromboembolic events occurred 5 - 21 days after COVID-19 vaccine administration in unusual sites such as the abdomen and brain and can vary widely from deep vein thrombosis to pulmonary embolism, splanchnic, portal or hepatic vein thrombosis, CVST, and ophthalmic vein thrombosis [15, 16].

The association between vaccine administration and the subsequent thromboembolic event is not well understood. To this end, here in this review, we summarized 23 articles that explicitly discussed cerebral vaccination-induced coagulopathy with associated thrombocytopenia. Our focus relies on understanding the clinical and laboratory findings in post-COVID-19 vaccination cerebral coagulopathies and providing new insight about the patients at risk of developing thromboembolic diseases following vaccination.


Our study was performed and reported based on the guidelines outlined in the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA, Fig. 1). A comprehensive literature search was performed on PubMed, Google Scholar and Norris Medical Library databases using the following key terms: COVID-19vaccines (“AstraZeneca” or “AZD1222 COVID vaccine” or “ChAdOx1 nCoV-19 COVID-19 vaccine” or “Janssen” or “Johnson & Johnson COVID vaccine” or “Ad26.COV2 COVID vaccine”), coagulopathy (“cerebral venous sinus thrombosis (CVST)” and “vaccine-induced immune thrombotic thrombocytopenia (VITT)” or “cerebral venous thrombosis (CVT)”) and thrombocytopenia. All the relevant articles on post-vaccine CVST and associated VITT in humans presenting at least one case of CVST after the COVID-19 vaccination within the English literature until August 1, 2021, were included. The articles were reviewed by two independent authors and the data were entered into a data sheet. Protocols without findings, articles without CVST cases and articles published in a language other than English were excluded from the current systematic review.

Click for large image
Figure 1. Study identification and selection process.

This review surveyed 23 most recent articles reporting on 66 patients with CVST and associated VITT following vaccination against COVID-19 [5, 14-35]. The reviewed papers are summarized here (Supplementary Material 1, www.neurores.org) with focus on functional outcome, characteristics of the patients, clinical manifestations and imaging and laboratory findings. The age of the patients was > 18 (range: 18 - 60) years old. The majority of cases were seen among women (43 females versus14 males). Platelet count in patients was between 5 and 127 × 109/L. Most of the patients lacked a significant past medical history. Two patients had hypothyroidism and two had Hashimoto’s thyroiditis. None of the patients had active cancer or had used any anticoagulation before admission. Two of the patients were on antihypertensive medications, three had a recent history of oral contraceptive use, one had the contraceptive vaginal ring, one case was on hormone replacement therapy, one patient had a history of type 1 von Willebrand disease and positive anticardiolipin antibody, and one patient had prothrombin mutation. Obesity was reported in six patients. The international normalized ratio (INR) was normal in almost all of the patients. Ninety-six percent of the patients had low platelet levels and 86% had increased D-dimer. A total of 68% of the patients had positive platelet factor 4 (PF4) IgG assay in the absence of prior exposure to heparin.

CVST associated with VITT following adenoviral vector vaccination is a rare syndrome that occurs approximately 5 - 19 days following vaccination. Although rare, the mortality rate has been reported as high as 39%. The most common clinical presentations of the patients with CVST and thrombocytopenia following adenoviral vector vaccination are similar to typical CVST patients. The majority of the patients in this review presented initially with headaches. Per the American Heart Association recommendations, persistent headaches should increase concern for CVST or other thrombotic events post adenoviral vector vaccination [36].


Knowing the mechanism of hypercoagulability induced by SARS-CoV-2 infection may help researchers elaborate further on post-COVID-19 vaccination-associated VITT [37]. Coronavirus may also increase the risk of coagulation through other unknown pathophysiological mechanisms [38, 39]. The mechanism of coagulation by COVID-19 is initiated by the binding of spike surface protein of SARS-CoV-2 to human angiotensin-converting enzyme (ACE) 2 receptor, causing direct viral endothelial invasion, endothelial apoptosis, and neuronal damage [38, 40-54]. Studies have found that infection with SARS-CoV-2 and activation of the coagulation cascade, cytokine storm-related prothrombotic state, and/or increased platelet activity can accelerate the progression of cerebrovascular events including CVST [6, 40, 41]. CVST has been reported as a very rare neurological complication of COVID-19 patients during the pandemic [55].

Mainly seen in women of childbearing age, CVST is often difficult to diagnose due to heterogeneous and non-specific neurological manifestations such as headache, seizure, altered consciousness, and focal neurological signs [56, 57]. Most CVST patients (73-82.6%) have relevant risk factors [56] including thrombophilia, oral contraceptives, fasting, malignancy, infection, trauma, pregnancy, puerperium [58-61], lumbar puncture, neurosurgical procedures, tumor compression, and endocrine disturbances [31, 62].

With more doses of adenoviral vector vaccine given each day, numerous cases of CVST with thrombocytopenia have been reported in vaccinated individuals. The symptoms that triggered seeking medical attention in post-COVID-19 vaccinated CVST patients were similar to other CVST cases. To establish the diagnosis of CVST associated with VITT after COVID-19 vaccination in patients with neurological symptoms, laboratory evidence should be present along with a diagnosis of CVST on imaging modalities [38]. Laboratory features in post-COVID-19 vaccinated CVST patients were platelet count below 100 × 109/L, high D-dimer, and low serum fibrinogen [5]. CVST was assessed via non-invasive imaging such as brain magnetic resonance imaging (MRI), magnetic resonance venography (MRV), and computed tomography venography (CTV) [38].

Immunologic interactions and coagulopathy have been previously reported with other vaccines [63]. In 1973, thrombotic thrombocytopenia was reported post influenza vaccination [64]. Reports of similar event after H1N1, rabies and pneumococcal vaccination also exist [65-68]. Nevertheless, CVST has not been reported in any of these cases [64, 66].

Vaxzevria and Janssen-Johnson & Johnson vaccines contain replication-incompetent adenoviral vectors from chimpanzees and humans, respectively. Both recombinant factors encode the spike glycoprotein of SARS-CoV-2 which may lead to activation of immune cells and coagulopathy [69, 70]. Rare cases of extensive thrombosis associated with severe thrombocytopenia and disseminated intravascular coagulation along with the presence of anti-PF4 antibodies have been reported after the AstraZeneca vaccine [2, 29].

The presence of anti-PF4 antibodies in post-COVID-19 vaccine CVST and VITT cases points out to an underlying immunologic phenomenon predisposing to platelet consumption, thrombocytopenia and thrombosis; a mechanism similar to heparin-induced thrombocytopenia (HIT), fittingly named spontaneous [71] or autoimmune HIT syndrome [22, 72].

Classic HIT is caused by antibodies against heparin/platelet PF4 complexes [73] and occurs in 0.76% of hospitalized patients receiving intravenous thromboprophylaxis [74].

In contrast to the classic HIT, in which immune activation is caused by exogenous heparin, in spontaneous (autoimmune) HIT an endogenous anion such as polyphosphate or chondroitin sulfate causes anti-PF4 antibody formation [14, 72]. It has been proposed that part of the adenoviral vector vaccine cross-reacts with PF4 on platelets due to molecular mimicry, causing anti-PF4 antibody formation (antibody responses against PF4/polyanion) and may play role in VITT syndrome cases after AstraZeneca COVID-19 vaccine administration [72, 75, 76]. Researchers have hypothesized that complement activation by antibodies against vaccine components can stimulate VITT [77]. Similar to heparin’s “vaccine-induced COVID-19 mimicry,” production of the soluble spike protein variant encoded by adenoviral vector vaccine acts as a polyanion to mediate PF4 activation and trigger antibody-dependent cell-mediated cytotoxicity (ADCC) or complement-dependent cytotoxicity [10, 78].

Nonetheless, adenovirus interaction with platelets in vivo has been reported to deplete platelets [79]. Moreover, continuous tissue compression in major surgeries can induce anti-PF4/polyanion antibodies without heparin treatment when mechanical compression devices are used for thrombosis prophylaxis [10]. Tissue micro-trauma and deoxyribonucleic acid (DNA) release from the vaccine promote adenoviral contact with PF4 and increase anti-PF4 autoantibodies [10, 76]. Cluster of differentiation (CD)147 has been associated with thrombosis in SARS-CoV and human immunodeficiency virus (HIV)-1 but no direct role for SARS-CoV-2 has been identified yet [76]. Thrombocytopenia is the most common laboratory finding in HIT [73], a phenomenon also observed in the 66 patients studied here who received the COVID-19 vaccine and developed CVST associated with VITT.


In suspected CVST patients associated with VITT who are also positive foranti-PF4 antibody, the recommended treatment is similar to that of severe HIT. Due to the similarity of pathophysiology and laboratory findings of post-COVID vaccination VITT-associated CVST to HIT syndrome, heparin avoidance could be considered in the treatment plan [80]. Collaboration among vascular neurologists, hematologists, and neurosurgeons consultants for managing systemic thrombosis is very important.

Anticoagulant therapy can be achieved with non-heparin agents [81], e.g., direct thrombin inhibitors (argatroban and bivalirudin), direct factor Xa inhibitors (rivaroxaban and apixaban), fondaparinux, and danaparoid [80, 82, 83] chosen according to the patient’s clinical status (risk of bleeding or need for an invasive procedure) [84].

Despite very sparse data, administration of intravenous immunoglobulin (IVIG) (1 g/kg body weight) daily for 2 days has been suggested after anti-PF4 antibodies have been sent [80].

If imaging does not show overt thrombosis, but thrombocytopenia with D-dimer elevation is present, thromboprophylaxis with non-heparin anticoagulants should be started [84].

Moreover, in CVST patients with an impending herniation neurosurgical intervention may be necessary with decompressive craniotomy [31]. Platelet transfusion should be avoided in CVST patients associated with VITT who are also positive for anti-PF4 antibody due to the risk of further antibody-mediated platelet activation and coagulopathy, but should be considered before any intervention [31].

Treatment should not be delayed in case the result of the enzyme-linked immunoassay (ELISA) anti-PF4 autoantibodies is not available but the other features of the VITT-associated CVST exist [75]. Wolf et al showed a continuous improvement in the platelet count and spontaneous resolution within 2 weeks in a patient without immunoglobulin administration or plasmapheresis [26].

Risks and Benefits of Vaccination▴Top 

Marketing of the Vaxzevria vaccine was authorized in the European Union (EU) in January 2021; and by July 4, 2021, more than 58.4 million doses had been administered in Europe [85]. After initial reported complications, on March 18, 2021, the EMA Risk Assessment Committee assumed that the vaccine was effective and safe [25]. As of June 27, 2021, 479 cases of suspected TTS with Vaxzevria were reported to EudraVigilance from EU countries; 100 of which had a fatal outcome [85]. Nearly 9 million doses on Janssen-Johnson & Johnson vaccine were administered by May 12, 2021, with 28 reported cases of TTS [86]. A review of all available data shows that the known and potential benefits of Janssen-Johnson & Johnson vaccine outweigh its known and potential risks [87]. Nevertheless, CVST should be considered as a very rare complication of COVID-19 vaccination [59] that can cause stroke in young adults and women of reproductive age more than others [88]. As reported, 35-50% of COVID-19 vaccination-induced CVST cases succumb to death [26].


The present paper reports on an evolving global phenomenon, and several limitations should be considered. Due to potential underreporting of side effects, the risk of adverse effects (e.g., cerebral thrombosis) following COVID-19 vaccination may be higher. Other patients may ignore related symptoms, refuse imaging or not have the training necessary to recognize alarming symptoms. A lack of information on outcome is contributing to increased vaccination hesitancy worldwide as there have been reports of life-threatening adverse events. At the time of writing this article, there is not enough information regarding the incidence of CVST-associated VITT following the second dose of adenoviral vector vaccines, as a sufficient follow-up period is not yet available. The side effect profile of all COVID-19 vaccines still needs to be investigated in future clinical trials.


Early diagnosis and treatment of CVST plays a fundamental role in decreasing the rate of mortality. Given the rarity of CVST after the COVID-19 vaccine, the benefit of vaccination outweighs the potential harm. According to the latest investigations, the mechanism of CVST is similar to HIT. To ensure safety, it is important not to dismiss persistent headache, seizure and other neurological symptoms in COVID-19 vaccinated individuals. Researchers and clinicians should further investigate the interactions of the vaccine with the immune system to further unravel the underlying mechanism of coagulopathy post COVID-19 vaccination.

Supplementary Material▴Top 

Suppl 1. Clinical and laboratory findings of the patients with thromboembolic events after Oxford-AstraZeneca and Johnson & Johnson COVID-19 vaccination.


None to declare.

Financial Disclosure

Authors have no relevant financial disclosure to report.

Conflict of Interest

None to declare.

Author Contributions

All authors have contributed to the theoretical formalism, designing the study, data collection, data analysis and writing the manuscript.

Data Availability

The authors declare that data supporting the findings of this study are available within the article and its supplementary file.

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