MRI Head Without IV Contrast DWI-MRI and T2-weighted sequences are highly sensitive for ischemic changes in the patient with acute ischemic stroke. Although often performed as part of the initial evaluation of late presenting strokes to delineate the extent of completed ischemic infarct, evaluate potential underlying etiology, and identify any complications, the value of the information provided by MRI over initial CT for improving patient outcome is unclear, as are the circumstances in which it is useful [74-79]. Current AHA guidelines only specify MRI in 2 circumstances: evaluation for wake- up strokes and evaluation for patent foramen ovale closure [12,13]. MRV Head Without and With IV Contrast There is no relevant literature to support the use of MRV of the head without and with IV contrast in the evaluation of ischemic stroke in the absence of suspicion for CVT. MRV Head Without IV Contrast There is no relevant literature to support the use of MRV of the head without IV contrast in the evaluation of ischemic stroke in the absence of suspicion for CVT. US Duplex Doppler Carotid Artery Current AHA guidelines recommend noninvasive imaging of the cervical carotid arteries for patients with minor stroke who are candidates for CEA or stenting, within 24 hours of hospitalization or 48 hours of onset due to the high early risk of recurrent stroke in patients with symptomatic carotid stenosis [12,13]. US duplex carotid Doppler is useful for assessing the degree of carotid stenosis in anterior circulation infarcts due to the noninvasive nature of the examination, the high degree of accuracy, and the absence of time pressure of EVT candidacy associated with delayed presenting strokes [38,80]. Carotid Doppler is a highly accurate tool for evaluating for and assessing the degree of carotid stenosis in anterior circulation infarcts, which CTA may overestimate, particularly in the setting of significant carotid calcification [24,38].
Cerebrovascular Diseases Stroke and Stroke Related Conditions PCAs. MRI Head Without IV Contrast DWI-MRI and T2-weighted sequences are highly sensitive for ischemic changes in the patient with acute ischemic stroke. Although often performed as part of the initial evaluation of late presenting strokes to delineate the extent of completed ischemic infarct, evaluate potential underlying etiology, and identify any complications, the value of the information provided by MRI over initial CT for improving patient outcome is unclear, as are the circumstances in which it is useful [74-79]. Current AHA guidelines only specify MRI in 2 circumstances: evaluation for wake- up strokes and evaluation for patent foramen ovale closure [12,13]. MRV Head Without and With IV Contrast There is no relevant literature to support the use of MRV of the head without and with IV contrast in the evaluation of ischemic stroke in the absence of suspicion for CVT. MRV Head Without IV Contrast There is no relevant literature to support the use of MRV of the head without IV contrast in the evaluation of ischemic stroke in the absence of suspicion for CVT. US Duplex Doppler Carotid Artery Current AHA guidelines recommend noninvasive imaging of the cervical carotid arteries for patients with minor stroke who are candidates for CEA or stenting, within 24 hours of hospitalization or 48 hours of onset due to the high early risk of recurrent stroke in patients with symptomatic carotid stenosis [12,13]. US duplex carotid Doppler is useful for assessing the degree of carotid stenosis in anterior circulation infarcts due to the noninvasive nature of the examination, the high degree of accuracy, and the absence of time pressure of EVT candidacy associated with delayed presenting strokes [38,80]. Carotid Doppler is a highly accurate tool for evaluating for and assessing the degree of carotid stenosis in anterior circulation infarcts, which CTA may overestimate, particularly in the setting of significant carotid calcification [24,38].