S B Coutts
Affiliation: University of Calgary
- Hyperperfusion syndrome: toward a stricter definitionShelagh B Coutts
Department of Clinical Neurosciences, University of Calgary, and Seaman Family MR Research Centre, Calgary, Alberta, Canada
Neurosurgery 53:1053-58; discussion 1058-60. 2003..Hyperperfusion syndrome is a rare and potentially devastating complication of carotid endarterectomy or carotid artery angioplasty and stenting. With the advent of new imaging techniques, we reviewed our experience with this phenomenon...
- Silent ischemia in minor stroke and TIA patients identified on MR imagingS B Coutts
Seaman Family MR Centre, Foothills Hospital, Calgary, Alberta T2N 2T9, Canada
Neurology 65:513-7. 2005..With patients with minor stroke and TIA having a higher risk of recurrent clinical events, the authors examined whether patients with minor stroke and TIA also had a high rate of asymptomatic lesions on repeat MRI scanning...
- Recurrent events in transient ischemic attack and minor stroke: what events are happening and to which patients?Shelagh B Coutts
Department of Clinical Neurosciences, Room C1246, Foothills Medical Centre, 1403 29th St SW, Calgary, AB, T2N 2T9, Canada
Stroke 39:2461-6. 2008..Clinical trials are needed to assess acute treatment options in these patients. We sought to evaluate the type of recurrent events and to identify which subsets of patients are at risk for recurrent events...
- ASPECTS on CTA source images versus unenhanced CT: added value in predicting final infarct extent and clinical outcomeShelagh B Coutts
Seaman Family MR Centre, Foothills Hospital, Calgary Health Region, 1403 29th St NW, Calgary, Alberta T2N 2T9, Canada
Stroke 35:2472-6. 2004..CT angiography-source images (CTA-SI) predict final infarct volume. We examined whether the final infarct ASPECTS and clinical outcome were more related to acute CTA-SI ASPECTS than to the acute noncontrast CT (NCCT) ASPECTS...
- Interobserver variation of ASPECTS in real timeShelagh B Coutts
Seaman Family MR Centre, Calgary Health Region, Foothills Hospital, Calgary, Alberta, Canada
Stroke 35:e103-5. 2004..We sought to assess the reliability of the score when performed in real time as compared with an expert rating performed at a later time point...
- An improved scoring system for identifying patients at high early risk of stroke and functional impairment after an acute transient ischemic attack or minor strokeShelagh B Coutts
Seaman Family MR Research Centre, Foothills Medical Centre, Calgary Health Region, Calgary, AB, Canada
Int J Stroke 3:3-10. 2008..Modern imaging of the brain was not included. The present study quantified the added value of magnetic resonance imaging (MRI) factors to the ABCD(2) tool...
- Mild neurological symptoms despite middle cerebral artery occlusionShelagh B Coutts
Department of Clinical Neurosciences, University of Calgary, Alberta T2N 2T9, Canada
Stroke 35:469-71. 2004..Only a small percentage of stroke patients are treated with thrombolytic therapy. We sought to determine whether vessel occlusion in mild strokes represented a new target population for interventional therapy...
- Syncope and cerebral hypoperfusionShelagh B Coutts
Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
Neurology 60:2011. 2003
- Reliability of assessing percentage of diffusion-perfusion mismatchShelagh B Coutts
Seaman Family MR Research Centre, Foothills Medical Centre, Calgary Health Region, Calgary, Alberta T2N 2T9, Canada
Stroke 34:1681-3. 2003..The present study sought to estimate the reliability of assessing the percentage of DWI-PWI mismatch...
- Computed tomography and computed tomography angiography findings predict functional impairment in patients with minor stroke and transient ischaemic attackS B Coutts
Seaman Family MR Research Centre, Foothills Medical Centre, Calgary Health Region, AB, Canada
Int J Stroke 4:448-53. 2009..We hypothesised that noncontrast computed tomography and computed tomography angiography findings in minor stroke and transient ischaemic attack patients would also predict functional outcome...
- Acute ischemic lesions of varying ages predict risk of ischemic events in stroke/TIA patientsP N Sylaja
Calgary Stroke Program, University of Calgary, Calgary, Alberta, Canada T2N 2T9
Neurology 68:415-9. 2007..Our goal was to evaluate whether the presence of ischemic lesions of varying ages identified by DWI and apparent diffusion coefficient (ADC) suggests a higher risk of future ischemic events...
- Frequency and clinical course of stroke and transient ischemic attack patients with intracranial nonocclusive thrombus on computed tomographic angiographyVolker Puetz
Calgary Stroke Program, Department of Clinical Neurosciences, Foothills Medical Centre, Room 1162, University of Calgary, Calgary, Canada
Stroke 40:193-9. 2009..We sought to determine the frequency and clinical course of patients with acute ischemic stroke or transient ischemic attack (TIA) who had intracranial nonocclusive thrombus (iNOT) on CT angiography (CTA)...
- The ASPIRE approach for TIA risk stratificationS B Coutts
Calgary Stroke Program, University of Calgary, Calgary Department of Clinical Neurosciences, University of Calgary, Calgary
Can J Neurol Sci 38:78-81. 2011..We assessed the ability of the ASPIRE approach to identify patients at risk for stroke...
- Triaging transient ischemic attack and minor stroke patients using acute magnetic resonance imagingShelagh B Coutts
Seaman Family MR Research Centre, Foothills Medical Centre, Calgary Health Region, Calgary, Alberta, Canada
Ann Neurol 57:848-54. 2005....
- Intracranial thrombus extent predicts clinical outcome, final infarct size and hemorrhagic transformation in ischemic stroke: the clot burden scoreVolker Puetz
University of Calgary, Department of Clinical Neurosciences, Calgary Stroke Program, Canada
Int J Stroke 3:230-6. 2008..In ischemic stroke, functional outcomes vary depending on site of intracranial occlusion. We tested the prognostic value of a semiquantitative computed tomography angiography-based clot burden score...
- When to expect negative diffusion-weighted images in stroke and transient ischemic attackP N Sylaja
Calgary Stroke Program, Department of Clinical Neurosciences, Foothills Medical Centre, Room 1162, University of Calgary, Alberta, Canada
Stroke 39:1898-900. 2008..The frequency of DWI negative cerebral ischemia and clinical factors associated with such a circumstance is not well understood...
- Extent of early ischemic changes on computed tomography (CT) before thrombolysis: prognostic value of the Alberta Stroke Program Early CT Score in ECASS IIImanuel Dzialowski
Department of Clinical Neurosciences, Calgary Stroke Program, University of Calgary, Alberta, Canada
Stroke 37:973-8. 2006..We hypothesized that dichotomized ASPECTS predicts response to intravenous thrombolysis and incidence of secondary hemorrhage within 6 hours of stroke onset...
- MR perfusion and diffusion in acute ischemic stroke: human gray and white matter have different thresholds for infarctionMichael S Bristow
Department of Electrical and Computer Engineering, University of Calgary, Alberta, Canada
J Cereb Blood Flow Metab 25:1280-7. 2005..This study suggests that tissue-specific analysis of perfusion and diffusion imaging is required to accurately predict tissue at risk of infarction in acute ischemic stroke...
- What is causing crescendo transient ischemic attacks?Shelagh B Coutts
Seaman Family MR Centre, Foothills Medical Centre, Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
Can J Neurol Sci 30:171-3. 2003..We discuss a case report from a patient who had symptoms of transient neurological deficits in the presence of a chronic subdural hematoma and severe carotid stenosis. Multi-modality imaging was used to guide management...
- Alberta Stroke Program Early CT Score in acute stroke triageAndrew M Demchuk
Department of Clinical Neurosciences, Foothills Medical Centre, University of Calgary, Calgary, AB, Canada
Neuroimaging Clin N Am 15:409-19, xii. 2005..CT is likely to remain the workhorse of acute stroke imaging for some time to come...
- Diffusion and perfusion MR imaging of acute ischemic strokeAshley D Harris
Department of Radiology, University of Calgary, Calgary, Alberta, T2N 2T9 Canada
Magn Reson Imaging Clin N Am 17:291-313. 2009....
- MR angiography compared to conventional selective angiography in acute strokeAnna I Tomanek
Seaman Family MR Research Centre, University of Calgary, Calgary, AB Canada
Can J Neurol Sci 33:58-62. 2006..The purpose of this study was to determine the accuracy of MRA in evaluation of intracranial vessels in acute stroke and transient ischemic attack (TIA) patients..
- Identifying lesion growth with MR imaging in acute ischemic strokeMichael S Bristow
Department of Radiology, University of Calgary, Calgary, Alberta, Canada
J Magn Reson Imaging 28:837-46. 2008..To determine whether different MR diffusion- and perfusion-weighted imaging (DWI and PWI) parameters are important in distinguishing lesion growth from the acute lesion and from oligemia...
- Acute corticospinal tract Wallerian degeneration is associated with stroke outcomeGiselle DeVetten
Seaman Family MR Research Centre, Foothills Medical Centre, Alberta Health Services, Alberta, Canada
Stroke 41:751-6. 2010..In this study we test the hypothesis that early diffusion changes also occur in the corticospinal tract (CST) of adults after stroke and that these lesions are associated with poor outcome...
- Perfusion MRI abnormalities in speech or motor transient ischemic attack patientsAndrea L Krol
Seaman Family MR Centre, Foothills Medical Centre, Calgary Health Region, Calgary, Alberta, Canada
Stroke 36:2487-9. 2005..One possible mechanism of neurological worsening is the presence of perfusion abnormalities. We sought to identify what proportion of TIA patients had evidence of perfusion abnormalities on MRI...
- Predicting recurrent stroke after minor stroke and transient ischemic attackPhilippe Couillard
Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
Expert Rev Cardiovasc Ther 7:1273-81. 2009..The need for identification of the cause of the initial event, allowing therapies to be tailored to the individual patient, is discussed...
- Do all ischemic stroke subtypes benefit from organized inpatient stroke care?E E Smith
Calgary Stroke Program, Department of Clinical Neurosciences, Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada T2N 2T9
Neurology 75:456-62. 2010..We analyzed the effect of organized stroke care in all stroke subtypes in a longitudinal cohort study using data from the Registry of the Canadian Stroke Network...
- Sleep apnea in patients with transient ischemic attack and minor stroke: opportunity for risk reduction of recurrent stroke?Wesley Chan
Calgary Stroke Program, Faculty of Medicine, University of Calgary, Alberta, Canada
Stroke 41:2973-5. 2010..Obstructive sleep apnea (OSA) may increase this risk. The objectives of our study were to determine the prevalence and severity of OSA and its clinical presentation in this population...
- Impact of a stroke unit on length of hospital stay and in-hospital case fatalityHai Feng Zhu
Calgary Stroke Program, Department of Clinical Neurosciences, University of Calgary, Foothills Hospital, Rm 1242A, 1403 29 Street NW, Calgary, Alberta, T2N 2T9, Canada
Stroke 40:18-23. 2009..In 2001, a multidisciplinary stroke unit was opened at our institution. We observed whether a stroke unit reduces length of stay and in-hospital case fatality when compared to admission to a general neurology/medical ward...
- ASPECTS reading requires training and experienceShelagh B Coutts
Stroke 34:e179; author reply e179. 2003
- Systematic review of associations between the presence of acute ischemic lesions on diffusion-weighted imaging and clinical predictors of early stroke risk after transient ischemic attackJessica N E Redgrave
Stroke Prevention Research Unit, Department of Clinical Neurology, Radcliffe Infirmary, Oxford, UK
Stroke 38:1482-8. 2007....
- Hyperacute stroke: experience essential when reading unenhanced CT scansJ H Warwick Pexman
AJNR Am J Neuroradiol 25:516; author reply 516-8. 2004
- Incidence of radiocontrast nephropathy in patients undergoing acute stroke computed tomography angiographyAndrea L Krol
Stroke 38:2364-6. 2007..We investigated the incidence of contrast-induced renal impairment in these populations...
- Diffusion-weighted imaging-negative patients with transient ischemic attack are at risk of recurrent transient eventsJean Martin Boulanger
Stroke 38:2367-9. 2007..We assessed the implication of negative diffusion-weighted imaging on a baseline MRI in predicting subsequent TIA...
- "Clinical-CT mismatch" and the response to systemic thrombolytic therapy in acute ischemic strokeDavid M Kent
Institute for Clinical Research and Health Policy Studies, Department of Medicine, Tufts New England Medical Center, Tufts University School of Medicine, Boston, MA, USA
Stroke 36:1695-9. 2005..We explored this hypothesis using a combined database including 4 major clinical trials of intravenous (IV) thrombolytic therapy...
- White matter thresholds for ischemic penumbra and infarct core in patients with acute stroke: CT perfusion studyBlake D Murphy
Department of Imaging, Lawson Health Research Institute, London, Ontario, Canada
Radiology 247:818-25. 2008....
- Transient ischemic attack etiologic subtype and early risk of strokeAlexandre Y Poppe
Stroke 39:e108; author reply e109-10. 2008
- CTA source images in acute strokeMichael D Hill
Stroke 34:835-7; author reply 835-7. 2003
- Extent of hypoattenuation on CT angiography source images predicts functional outcome in patients with basilar artery occlusionVolker Puetz
University of Technology Dresden, Department of Neurology, Dresden University Stroke Center, Fetscherstrasse 74, 01307 Dresden, Germany
Stroke 39:2485-90. 2008..We tested the validity of a novel CT score, the posterior circulation Acute Stroke Prognosis Early CT score (pc-ASPECTS)...
- Cerebral microhemorrhages predict new disabling or fatal strokes in patients with acute ischemic stroke or transient ischemic attackJean Martin Boulanger
Clinique Neuro Rive Sud, 4896 Blvd Taschereau 250, Greenfield Park, Provinvr of Quebec, Canada, J4V 2J2
Stroke 37:911-4. 2006..Cerebral microhemorrhages (MHs) are common among patients presenting with acute ischemic stroke and may predict both subsequent ischemic and hemorrhagic strokes...
- Can the ischemic penumbra be identified on noncontrast CT of acute stroke?Keith W Muir
Division of Clinical Neurosciences, University of Glasgow, Glasgow, Scotland, UK
Stroke 38:2485-90. 2007..Early ischemic changes on noncontrast CT in acute stroke include both hypoattenuation and brain swelling, which may have different pathophysiological significance...
- Cerebral blood flow threshold of ischemic penumbra and infarct core in acute ischemic stroke: a systematic reviewTing Yim Lee
Stroke 37:2201; author reply 2203. 2006