The aim of this study is to analyze the relationship between the blood biomarker GDF-15 and heart damage after stroke. It is being conducted in France, in the Neurology Department of the Dijon University Hospital (Burgundy). The research is interventional because a biological blood test will be performed, as well as a heart rhythm recording and several cardiac echograms during the hospitalization of the participants and during the follow-up consultation scheduled 4 to 6 months after the stroke. A total of 130 stroke patients will participate in this study. Participation includes 4 visits: * Inclusion visit (within 24 hours of the first stroke symptoms) * visit 1 (within 24 to 72 hours of stroke) * visit 2 (within 48 hours of visit 1) * Visit 3 (approximately 4-6 months post-stroke)