The objective of this observational study is to compare the relative concentrations of various thrombo-inflammatory markers at different follow-up time points in: * patients with or without delayed cerebral ischemia after subarachnoid hemorrhage, and * patients with or without rapid progression of necrotic volume after an ischemic stroke due to large- or medium-vessel occlusion in the anterior circulation. The main question this study aims to answer is: How do thrombo-inflammatory marker concentrations evolve over time and differ between patients? Researchers will compare patients with or without delayed cerebral ischemia after subarachnoid hemorrhage, as well as patients with or without rapid progression of necrotic volume following an ischemic stroke due to large- or medium-vessel occlusion in the anterior circulation, to determine whether there are differences in thrombo-inflammatory marker concentrations and in their evolution over time. Participants will undergo blood sampling at five different time points. In addition, participants will complete a Montreal Cognitive Assessment (MoCA) questionnaire during the 3-month follow-up visit.
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Investigation of changes in thrombo-inflammatory marker concentrations between patients and over time.
Timeframe: From enrollment to Month 3 visit