07 abril 2011

STROKE. Successful Recanalization by Intravenous Thrombolysis in Acute Anterior Stroke Depends on Thrombus Length

Christian H. Riedel, MD; Philip Zimmermann, MD; Ulf Jensen-Kondering, MD; Robert Stingele, MD; Günther Deuschl, MD; Olav Jansen, MD

Background and Purpose—We hypothesize that in acute middle cerebral artery stroke, thrombus lengths measured in thin-slice nonenhanced CT images define a limit beyond which systemic thrombolysis will fail to recanalize occluded arteries. Stroke. 2011; 42: 1775-1777 Published online before print April 7, 2011. Copyright © 2011 American Heart Association, Inc. All rights reserved. Print ISSN: 0039-2499. Online ISSN: 1524-4628

01 mayo 2011

RADIOLOGY. Brain MR Imaging at Ultra-low Radiofrequency Power

Subhendra N. Sarkar , PhD David C. Alsop , PhD Ananth J. Madhuranthakam , PhD Reed F. Busse , PhD Philip M. Robson , PhD Neil M. Rofsky , MD David B. Hackney , MD

Purpose: To explore the lower limits for radiofrequency (RF) power– induced specific absorption rate (SAR) achievable at 1.5 T for brain magnetic resonance (MR) imaging without loss of tissue signal or contrast present in high-SAR clinical imaging in order to create a potentially viable MR method at ultra-low RF power to image tissues containing Materials and Methods: implanted devices. Copyright RSNA 2011. Radiology: Volume 259: Number 2—May 2011. radiology.rsna.org

28 septiembre 2011

JAMA. Operator Experience and Carotid Stenting Outcomes in Medicare Beneficiaries

Brahmajee K. Nallamothu, MD, MPH Hitinder S. Gurm, MD Henry H. Ting, MD Philip P. Goodney, MD Mary A. M. Rogers, PhD Jeptha P. Curtis, MD Justin B. Dimick, MD Eric R. Bates, MD Harlan M. Krumholz, MD, SM John D. Birkmeyer, MD

Context: Although the efficacy of carotid stenting has been established in clinical trials, outcomes of the procedure based on operator experience are less certain in clinical practice. Objective: To assess association between outcomes and 2 measures of operator experience: annual volume and experience at the time of the procedure among new operators who first performed carotid stenting after a national coverage decision by the Centers for Medicare & Medicaid Services (CMS). Copyright ©2011 American Medical Association. All rights reserved. JAMA, September 28, 2011—Vol 306, No. 12

21 abril 2011

STROKE. Cannabis Use, Ischemic Stroke, and Multifocal Intracranial Vasoconstriction

Valérie Wolff, MD; Valérie Lauer, MD; Olivier Rouyer, MD, PhD; François Sellal, MD; Nicolas Meyer, MD, PhD; Jean Sébastien Raul, MD, PhD; Cécile Sabourdy, MD; Fazel Boujan, MD; Christine Jahn, MD; Rémy Beaujeux, MD; Christian Marescaux, MD

Background and Purpose: Our objective was to evaluate the relationship between cannabis use and ischemic stroke in a young adult population. Stroke. 2011; 42: 1778-1780 Published online before print April 21, 2011. Copyright © 2011 American Heart Association, Inc. All rights reserved. Print ISSN: 0039-2499. Online ISSN: 1524-4628.

14 abril 2011

STROKE. Surgical Revascularization Reverses Cerebral Cortical Thinning in Patients With Severe Cerebrovascular Steno-Occlusive Disease

Jorn Fierstra, MSc; David B. MacLean, BSc; Joseph A. Fisher, MD; Jay S. Han, MSc; Daniel M. Mandell, MD; John Conklin, MSc; Julien Poublanc, MSc; Adrian P. Crawley, PhD; Luca Regli, MD; David J. Mikulis, MD; Michael Tymianski, MD, PhD

Background and Purpose—Chronic deficiencies in regional blood flow lead to cerebral cortical thinning without evidence of gross tissue loss at the same time as potentially negatively impacting on neurological and cognitive performance. This is most pronounced in patients with severe occlusive cerebrovascular disease in whom affected brain areas exhibit “steal physiology,” a paradoxical reduction of cerebral blood flow in response to a global vasodilatory stimulus intended to increase blood flow. We tested whether surgical brain revascularization that eliminates steal physiology can reverse cortical thinning. Stroke. 2011; 42: 1631-1637 Published online before print April 14, 2011. Copyright © 2011 American Heart Association, Inc. All rights reserved. Print ISSN: 0039-2499. Online ISSN: 1524-4628.

12 mayo 2011

STROKE. Partial Aortic Occlusion for Cerebral Perfusion Augmentation Safety and Efficacy of NeuroFlo in Acute Ischemic Stroke Trial

Ashfaq Shuaib, MD; Natan M. Bornstein, MD; Hans-Christoph Diener, MD; William Dillon, MD; Marc Fisher, MD; Maxim D. Hammer, MD; Carlos A. Molina, MD; J. Neal Rutledge, MD; Jeffrey L. Saver, MD; Peter D. Schellinger, MD; Harish Shownkeen, MD for the SENTIS Trial

Background and Purpose—Fewer than 5% of patients with acute ischemic stroke are currently treated, and there is need for additional treatment options. A novel catheter treatment (NeuroFlo) that increases cerebral blood flow was tested to 14 hours. Stroke. 2011; 42: 1680-1690 Published online before print May 12, 2011. Copyright © 2011 American Heart Association, Inc. All rights reserved. Print ISSN: 0039-2499. Online ISSN: 1524-4628.

26 abril 2012

AMERICAN JOURNAL OF NEURORADIOLOGY. The Effect of Intracranial Stent Implantation on the Curvature of the Cerebrovasculature

R.M. King, J.-Y. Chueh, I.M.J. van der Bom, C.F. Silva, S.L. Carniato, G. Spilberg, A.K. Wakhloo and M.J. Gounis

BACKGROUND AND PURPOSE: Recently, the use of stents to assist in the coiling and repair of wide-neck aneurysms has been shown to be highly effective; however, the effect of these stents on the RC of the parent vessel has not been quantified. The purpose of this study was to quantify the effect of intracranial stenting on the RC of the implanted artery using 3D datasets. Published online before print April 26, 2012, doi: 10.3174/ajnr.A3062. Copyright © 2012 American Society of Neuroradiology

01 julio 2011

RADIOLOGY. Intracranial Aneurysms Treated with Coil Placement: Test Characteristics of Follow-up MR Angiography–Multicenter Study

Joanna D. Schaafsma, MD, Birgitta K. Velthuis, MD, PhD, Charles B. L. M. Majoie, MD, PhD, René van den Berg, MD, PhD, Patrick A. Brouwer, MD, MSc, Frederik Barkhof, MD, PhD, Omid Eshghi, MD, Gerard A. P. de Kort, MD, Rob T. H. Lo, MD, Theo D. Witkamp, MD, Marieke E. S. Sprengers, MD, PhD, Marianne A. van Walderveen, MD, PhD, Joseph C. Bot, MD, PhD, Esther Sanchez, MD, W. Peter Vandertop, MD, PhD, Jan van Gijn, MD, FRCP, Erik Buskens, MD, PhD, Yolanda van der Graaf, MD, PhD and Gabriël J. E. Rinkel, MD

Purpose: To determine the test characteristics of magnetic resonance (MR) angiography in the assessment of occlusion of aneurysms treated with coil placement. July 2010 Radiology: 256, 209-218. Copiryght © RSNA, 2010

09 febrero 2012

AMERICAN JOURNAL OF NEURORADIOLOGY. Cilostazol Prevents Progression of Asymptomatic Carotid Artery Stenosis in Patients with Contralateral Carotid Artery Stenting

T. Kato, H. Sakai, T. Takagi and Y. Nishimura

BACKGROUND AND PURPOSE: The progression of atherosclerosis is related to various factors. Although antiplatelet therapy is used for the management of acute ischemic stroke and for the prevention of recurrent stroke, the antiplatelet agent cilostazol may also reduce restenosis after stent implantation in any vessel. This study was performed to assess the impact of cilostazol on plaque progression in the carotid artery contralateral to a stented artery. Published online before print February 9, 2012, doi: 10.3174/ajnr.A2955. Copyright © 2012 American Society of Neuroradiology

08 septiembre 2011

AMERICAN JOURNAL OF NEURORADIOLOGY. Creation of Bifurcation-Type Elastase-Induced Aneurysms in Rabbits

Y.H. Ding, R. Kadirvel, D. Dai and D.F. Kallmes

SUMMARY: Elastase incubation was performed in the LCCA in 13 New Zealand white rabbits. Three weeks after incubation, DSA demonstrated that 10 (10/13, 77%) bifurcation-type aneurysms at the origin of the LCCA were present; mean aneurysm neck, width, and height values were 3.7 ± 1.1, 3.8 ± 0.9, and 8.7 ± 2.3 mm, respectively. The LCCA can be used to create bifurcation aneurysms in rabbits. Published online before print September 8, 2011, doi: 10.3174/ajnr.A2666. Copyright © 2011 American Society of Neuroradiology

01 octubre 2011

NEUROSURGERY. Results of Embolization Used as the First Treatment Choice in a Consecutive Nonselected Population of Ruptured Aneurysms: Clinical Results of the Clarity GDC Study

Cognard, Christophe MD, PhD; Pierot, Laurent MD, PhD; Anxionnat, René MD, PhD; Ricolfi, Frédéric MD, PhD; The Clarity Study Group

BACKGROUND: The International Subarachnoid Aneurysm Trial (ISAT) showed that for ruptured aneurysms suitable for both techniques, coiling should be the first-choice treatment. Only a small proportion of patients (22%) with ruptured aneurysms were included in that trial. Operators were selected on their experience. One could then criticize the impact of the ISAT on clinical practice as a result of recruitment biases and operators selection. OBJECTIVE: To evaluate the morbidity and mortality of coiling when used as first-choice treatment in a consecutive population of patients with ruptured aneurysms treated by nonselected operators. Neurosurgery: October 2011 - Volume 69 - Issue 4 - pp 837-842 doi: 10.1227/NEU.0b013e3182257b30. Copyright © by the Congress of Neurological Surgeons

06 junio 2011

INTERNATIONAL JOURNAL OF EMERGENCY MEDICINE. Angioplasty in acute middle cerebral artery stroke due to atrial fibrillation selected by CT perfusion: a case report

Andrea Saletti, Ilaria Morghen, Luca Finessi and Enrico Fainardi

We report the experience of a case of acute stroke in a patient affected by Rendu Osler syndrome and atrial fibrillation. The combination of dynamic computerized tomography perfusion scans and the use of a highcompliance balloon allowed increasing the treatment window for intra-arterial recanalization over 6 h after stroke onset in a patient with middle cerebral artery occlusion. Saletti et al. International Journal of Emergency Medicine 2011, 4:23 http://www.intjem.com/content/4/1/23. Copytight © 2011 Saletti et al; licensee Springer.

06 junio 2011

INTERNATIONAL JOURNAL OF EMERGENCY MEDICINE. Treatments for reversing warfarin anticoagulation in patients with acute intracranial hemorrhage: a structured literature review

Brett F Bechtel, Timothy C Nunez, Jennifer A Lyon, Bryan A Cotton and Tyler W Barrett

The acute management of patients on warfarin with spontaneous or traumatic intracranial hemorrhage continues to be debated in the medical literature. The objective of this paper was to conduct a structured review of the medical literature and summarize the advantages and risks of the available treatment options for reversing warfarin anticoagulation in patients who present to the emergency department with acute intracranial hemorrhage. Bechtel et al. International Journal of Emergency Medicine 2011, 4:40 http://www.intjem.com/content/4/1/40. Copyright © 2011 Bechtel et al; licensee Springer.

07 enero 2012

CARDIOVASCULAR DISORDERS. Effect of calcification on the mechanical stability of plaque based on a three-dimensional carotid bifurcation model

Kelvin KL Wong, Pongpat Thavornpattanapong, Sherman CP Cheung, Zhonghua Sun and Jiyuan Tu

This study characterizes the distribution and components of plaque structure by presenting a threedimensional blood-vessel modelling with the aim of determining mechanical properties due to the effect of lipid core and calcification within a plaque. Numerical simulation has been used to answer how cap thickness and calcium distribution in lipids influence the biomechanical stress on the plaque. Wong et al. BMC Cardiovascular Disorders 2012, 12:7 http://www.biomedcentral.com/1471-2261/12/7. Copyright © 2012 Wong et al; licensee BioMed Central Ltd.

01 enero 2012

INTERNATIONAL JOURNAL OF EMERGENCY MEDICINE. Communicating carotid-cavernous sinus fistula following minor head trauma

Joshua B Kaplan, Aakash N Bodhit and Michael L Falgiani

A case of communicating carotid-cavernous sinus fistula (CCF) after minor closed head injury is presented. Kaplan et al. International Journal of Emergency Medicine 2012, 5:10 http://www.intjem.com/content/5/1/10. Copyright © 2012 Kaplan et al; licensee Springer.