SCRN Diagnostics-Exam 2023

CT Scan - Answer- Hypotenuse (dark)=Infarct Hyper dense (bright)=Hemorrhage May demonstrate subtle parenchymal within 3 hours Insensitive in detecting subcortical or cortical strokes CT perfusion - Answer- Useful if patient's out of IV fibrinolysis window Possible mechanical thrombectomy candidate CTA - Answer- Detailed images of the vasculature Arteries- arteriogram Veins- venogram Can detect AVM, aneurysm, PE, DVT Must be NPO Post CTA guidelines - Answer- Lay flat Sheath site checks: Q15 min x 1 hour, Q 30 x 1 hour, q 1 hour x 4 CTA - Answer- 3D vessel anatomy Uses contrast Quit Noninvasive MRI - Answer- More sensitive than CT Cant perform if pacemaker or spinal stimulator More effective at identifying stroke at 24 hours Avoids ionizing radiation compared to CT DSA - Answer- Digital Subtraction Angiography Visual vessels and lesions GOLD STANDARD for detection of cerebral vascular diseases. MRA - Answer- MRP - Answer- Diffusion Weighted imaging Most sensitive and specific for detecting acute infarct CT scan: hyperdence MCA sign - Answer- LVO Hyperdence MCA "dot" sign - Answer- represents clot within branch of MCA More amendable to IV TPA Sign of ischemia - Answer- Loss of gray-white differentiation DSA angiography - Answe