Central retinal vein occlusion post ChAdOx1 nCoV-19 vaccination – can it be explained by the two-hit hypothesis?

Autor: Shweta Parakh, Shrey Maheshwari, Shrutanjoy Das, Hans Vaish, Gaurav Luthra, Rupesh Agrawal, Vishali Gupta, Saurabh Luthra
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Journal of Ophthalmic Inflammation and Infection, Vol 12, Iss 1, Pp 1-8 (2022)
Druh dokumentu: article
ISSN: 1869-5760
DOI: 10.1186/s12348-022-00311-4
Popis: Abstract Purpose To report a case of central retinal vein occlusion (CRVO) seven days following the first dose of ChAdOx1 nCoV-19 vaccine and propose a hypothesis for the possible underlying pathogenesis. Observation A 31-year-old male presented with CRVO with cystoid macular edema, one week after receiving his first ChAdOx1 nCoV-19 vaccine dose. Apart from mild hyperhomocysteinemia, no major thrombophilic or systemic risk factors were found. Anti-platelet factor 4 antibodies, specific for vaccine-induced immune thrombotic thrombocytopenia, were also negative. However, he tested strongly positive (> 250 U/mL) for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) IgG spike antibodies, 2 weeks post the first dose – suggestive of a prior subclinical infection. Conclusion COVID-19 is known to be associated with an altered host one-carbon metabolism resulting in hyperhomocysteinemia. We hypothesize that a prior subclinical infection with COVID-19, the first hit, may have led to hyperhomocysteinemia in our patient and vaccination must have been the second hit that triggered the thrombotic event. Further studies, including correlation of thrombotic complications with IgG antibody titres post-vaccination, are essential in order to better understand the pathogenesis of such events.
Databáze: Directory of Open Access Journals
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