Bilateral Carotid Artery Dissections and Ischemic Stroke in a Patient With COVID-19: A Case Report.

An unresponsive patient with COVID-19 infection should prompt immediate evaluation with consideration of a vast differential diagnosis entailing a multitude of diagnostic and therapeutic interventions in the emergency department. We report a case of an unresponsive 41-year-old female with COVID-19 infection and a history of rheumatoid arthritis who presented to the emergency department with bilateral carotid artery dissections and left internal carotid artery thrombus that extended into the middle cerebral artery. This case calls into question if COVID-19 is coincidentally or causally associated with acute vascular and thromboembolic disease.

Acute Macular Neuroretinopathy Following COVID-19 mRNA Vaccination.

A 21-year-old female developed bilateral acute-onset paracentral scotomas three days after receiving the second dose of her Moderna COVID-19 vaccination. A clinical diagnosis of acute macular neuroretinopathy (AMN) was confirmed after classic findings were demonstrated on near-infrared reflectance imaging, spectral-domain optical coherence tomography, and colored fundus photography. The patient presented with visual acuity of 20/100-1 OD and 20/20 OS. After treatment with brimonidine and difluprednate, at a two-week follow-up, her visual acuity was 20/100-2 OD and 20/25-2 OS. There have been reported cases of AMN following flu-like illnesses as well as after receiving vaccines. However, this is the first report of AMN following vaccination with a Moderna COVID-19 vaccine.

Acute femoral artery occlusion in a male with Duhring disease and COVID-19 pneumonia treated with baricitinib.

Arterial thromboembolic events (ATE) in COVID-19, similarly as venous thromboembolism (VTE), are observed mainly in severely ill patients. ATE include brain, heart, aortic, and peripheral ischemic complications which usually aggravate a course of the disease leading to lifethreatening conditions. A CASE REPORT: The authors describe a case of a 53-year-old male with Duhring disease in the remission period admitted due to severe COVID-19 pneumonia. The patient was treated with ceftriaxone (2000 mg once daily), dexamethasone (8 mg once daily), enoxaparin (60 mg twice daily), baricitinib (4 mg once daily), and remdesivir (200 mg on the first day, followed by 100 mg within 4 consecutive days); he required high flow oxygen therapy. On day 5 of hospitalization, he began to suffer from pain of the right lower extremity; in physical examination the limb was cold with absent femoral, popliteal, and pedal pulses. Urgent computed tomography angiography revealed total occlusion of the right superficial femoral artery (SFA) in the absence of any atherosclerotic plaques in the aorta. The patient was intubated and transferred to department of vascular surgery, where a giant clot was removed from SFA. Unfortunately, the patient outcome was unfavorable due to respiratory failure progression. The authors underline that ATE may occur even in anticoagulated patients and that association of some therapeutic options of COVID-19, like janus kinase (JAK) inhibitors use with an increased risk of ATE, should not be excluded.

Large thrombus in transit in a COVID-19 patient.

The course of COVID-19 patients may be complicated by thromboembolic events. We report on a 48-year-old female COVID-19 patient who underwent surgical removal of a large intracardiac thrombus. As per our centre protocol, critically ill COVID-19 patients are anticoagulated by the direct thrombin inhibitor Argatroban with close monitoring of anti-IIa activity. An intra-atrial thrombus formation fixed in a patent foramen ovale but also large mobile portions in both atria was diagnosed 4 days after weaning and removal of the jugular and femoral extracorporeal membrane oxygenation cannulas. The thrombus was removed surgically via median sternotomy and on cardiopulmonary bypass. The thrombus had a bizarre appearance with several finger-like appendices, and histological analysis revealed a mixed picture of acute and chronic thrombus portions. This case highlights the risk of life-threatening thrombus formation in COVID-19 patients despite therapeutic thrombin inhibition.

Pathological findings in rotation thromboelastometry associated with thromboembolic events in COVID-19 patients.

BACKGROUND: Severe thromboembolic events are one of the major complications associated with COVID-19 infection, especially among critically ill patients. We analysed ROTEM measurements in COVID-19 patients with a severe disease course and in patients with severe sepsis. METHODS: In this study, data obtained by extended analysis of haemostasis with standard laboratory tests and thromboelastometry of 20 patients with severe course of COVID-19 were retrospectively analysed and compared with similar data from 20 patients with severe sepsis but no COVID-19. RESULTS: The thromboelastometry values obtained from 20 sepsis patients contained a maximum clot firmness above the normal range but among COVID-19 patients, hypercoagulability was much more pronounced, with significantly higher maximum clot firmness (FIBTEM: 38.4 ± 10.1 mm vs. 29.6 ± 10.8 mm; P  = 0.012; EXTEM: 70.4 ± 10.4 mm vs. 60.6 ± 14.8 mm; P  = 0.022). Additionally, fibrinogen levels were significantly higher among COVID-19 patients (757 ± 135 mg/dl vs. 498 ± 132 mg/dl, P < 0.0001). Furthermore, thromboelastometry showed fibrinolysis shutdown among COVID-19 patients with significantly lower maximum of lysis than among sepsis patients (EXTEM: 0.6 ± 1.2 % vs. 3.3 ± 3.7 %; P  = 0.013). Seven of 20 COVID-19 patients experienced thromboembolic events, whereas no patient in the sepsis group experienced such events. CONCLUSIONS: ROTEM analysis showed significantly different pathological findings characterized by hypercoagulability and fibrinolysis shutdown among COVID-19 patients with a severe disease course compared to patients with severe sepsis. These abnormalities seem to be associated with thromboembolic events.

COVID-19 Presenting as Major Thromboembolic Events: Virchow's Triad Revisited and Clinical Considerations of Therapeutic Anticoagulation.

This case series describes clinical course of three COVID-19 patients who presented with major thromboembolic events. Patient 1 is a 57-year-old male with asymptomatic COVID-19 who presented with a large left ventricular thrombus. His hospital course was complicated with a stroke. Patient 2 is a 71-year-old male with mild COVID-19 who presented with an acute stroke. Patient 3 is a 47-year-old male with severe COVID-19 who presented with a large pulmonary embolism. He died of a recurrent massive pulmonary embolism. This case series demonstrates that thromboembolic event can be the presenting feature of COVID-19 and can occur in the patients with asymptomatic or mild COVID-19. Diffuse endothelial injury and hypercoagulability play a pivotal role in recurrent thromboembolic events despite the anticoagulation. Therapeutic anticoagulation may be considered for severe COVID-19 patients and patients with important comorbidities or pre-existing endothelial dysfunction.