The purpose of this prospective multi-center study is to investigate whether patients with acute ischaemic stroke are able to recall information given before providing informed consent to intravenous thrombolysis after the end of treatment. Patients with acute ischaemic stroke will be compared to a group of relatives who witnessed the informed consent procedure of a relative with acute ischaemic stroke, stroke patients who were not treated with intravenous thrombolysis and patients without an ischaemic stroke but similiar risk factors (admitted to the Departement of Cardiology and Pneumology, Charité, Campus Benjamin Franklin, Berlin, Germany).