Barthel index Holter monitoring Medicine NIHSS acute ischemic stroke anemia ankle-brachial index difference aspirin resistance atherosclerosis atrial fibrillation blood transfusion carotid stenosis cerebral angiography cerebral infarction cervical duplex clinical outcome computed tomography angiography cone-beam computed tomography contrast agent cryptogenic stroke endothelial progenitor cells functional dependence functional magnetic resonance imaging hemorrhage infarction volume inter-ankle blood pressure difference intracerebral hematoma intravenous thrombolysis ischemic stroke large vessel disease