Ischaemic stroke and SARS-CoV-2 infection: a causal or incidental association?

Ischaemic stroke has been reported in patients with COVID-19, particularly in more severe cases. However, it is unclear to what extent this is linked to systemic inflammation and hypercoagulability secondary to the infection. We describe the cases of 4 patients with ischaemic stroke and COVID-19 who were attended at our hospital. Patients are classified according to the likelihood of a causal relationship between the hypercoagulable state and ischaemic stroke. We also conducted a review of studies addressing the possible mechanisms involved in the aetiopathogenesis of ischaemic stroke in these patients. The association between COVID-19 and stroke was probably causal in 2 patients, who presented cortical infarcts and had no relevant arterial or cardioembolic disease, but did show signs of hypercoagulability and systemic inflammation in laboratory analyses. The other 2 patients were of advanced age and presented cardioembolic ischaemic stroke; the association in these patients was probably incidental. Systemic inflammation and the potential direct action of the virus may cause endothelial dysfunction, resulting in a hypercoagulable state that could be considered a potential cause of ischaemic stroke. However, stroke involves multiple pathophysiological mechanisms; studies with larger samples are therefore needed to confirm our hypothesis. The management protocol for patients with stroke and COVID-19 should include a complete aetiological study, with the appropriate safety precautions always being observed. Se ha comunicado la asociación de ictus isquémico y COVID-19, con mayor frecuencia en aquellos pacientes más graves. Sin embargo, se desconoce en qué medida podría estar en relación con la inflamación sistémica e hipercoagulabilidad producidas en el contexto de la infección. Descripción de cuatro pacientes atendidos en nuestro Centro por ictus isquémico y diagnóstico de COVID-19, clasificándolos según el grado de probabilidad causal entre el estado de hipercoagulabilidad y el ictus isquémico. Revisión de la literatura sobre los posibles mecanismos implicados en la etiopatogenia del ictus isquémico en este contexto. Dos pacientes se consideraron con alta probabilidad causal: presentaban infartos corticales, sin patología cardioembólica ni arterial significativa, con parámetros de inflamación sistémica e hipercoagulabilidad; las otras dos pacientes eran de edad avanzada y el ictus isquémico se consideró cardioembólico, con una probable asociación casual de C