Abstract 2859: Comparison Of Four-dimensional Ct Angiography (4d-cta) With Mra In Acute Ischemic Stroke Patients With Probable Internal Carotid Artery Occlusion
Background and Purpose : Emergency MR angiography (MRA) can provide useful information to find the internal carotid artery (ICA) occlusion in an acute stroke setting. However, the usefulness of four-dimensional CT angiography (4D-CTA) using 320 rows area detector CT remains uncertain for emergency diagnosis of cerebral vasculature in acute ischemic stroke. The aim of our retrospective study was to investigate whether or not there were some differences between 4D-CTA and MRA findings in acute ischemic stroke patients with probable internal carotid artery occlusion.
Materials and Methods : Included for analysis were acute ischemic stroke patients 1) who were admitted to our institution within 48 hours of stroke onset from September 2010 to July 2011, 2) who underwent whole brain 4D-CTA within 24 hrs following emergency MRA on admission and 3) in whom the affected ICA was absolutely not visualized on MRA. We compared 4D-CTA findings with MRA findings. Result : During study period, 391 acute ischemic stroke patients were admitted within 48 hours from symptom onset and emergency MRA showed no visualization of the affected ICA in 36 of them. Among the 36 patients, 21 patients underwent 4D-CTA following MRA.4D-CTA demonstrated delayed antegrade flow of the affected ICA as time-sequence dynamic images in 9 of the 21 patients and the affected ICA supplied via collateral flow in one of them. In the rest, 4D-CTA could not visualize the affected ICA at all.
Conclusion : In an acute stroke setting, 4D-CTA can provide more accurate information of the affected ICA which is absolutely not visualized in MRA.
- © 2012 by American Heart Association, Inc.