Abstract
The degree of stenosis in the extracranial internal carotid artery helps predict the risk of an individual suffering subsequent cerebrovascular ischemic events. Different techniques have evolved to measure stenosis from angiograms, leading to some confusion and a call for the adoption of a single technique. To help choose the most reliable technique, this study assessed observer variability in reporting carotid stenosis for four different techniques, from both digital subtraction (DSA) and MR angiograms (MRA). Three of the techniques used caliper measurements; the fourth was the visual impression of stenosis. From a total of 137 angiograms, caliper measurements were possible on 105 DSAs and 74 MRAs. Measurements from these angiograms were made by two independent observers on two separate occasions to assess interobserver and intraobserver variation in reporting. For DSA, the variability in reporting and the number of clinically significant differences arising as a result were similar for each of the four techniques. While the typical measurement errors for each of the techniques studied were on the order of +/- 5%, each technique produced some sizable individual differences for the same angiogram, with resultant wide 95% limits...Continue Reading
References
Aug 15, 1991·The New England Journal of Medicine·UNKNOWN North American Symptomatic Carotid Endarterectomy Trial CollaboratorsM Eliasziw
Feb 8, 1986·Lancet·J M Bland, D G Altman
May 1, 1986·Progress in Cardiovascular Diseases·B G BrownH T Dodge
Dec 1, 1994·Journal of Neurology, Neurosurgery, and Psychiatry·G R YoungE T Smith
Citations
Oct 18, 2005·European Radiology·Zishu ZhangRitva Vanninen
Apr 25, 2007·Clinical Research in Cardiology : Official Journal of the German Cardiac Society·Peter LanzerChristiane Prettin
Jan 5, 2011·Atherosclerosis·Vahid NabaviMatthew J Budoff
Sep 27, 2003·European Journal of Radiology·William HollingworthJeffrey G Jarvik
Apr 11, 2001·Magnetic Resonance Imaging·A KastrupM E Moseley
Jul 28, 2005·International Journal of Rehabilitation Research. Internationale Zeitschrift Für Rehabilitationsforschung. Revue Internationale De Recherches De Réadaptation·Nilufer K O GokkayaAytul Cakci
Feb 9, 2007·Journal of Neurology, Neurosurgery, and Psychiatry·S KhanH S Markus
Mar 16, 2002·Radiographics : a Review Publication of the Radiological Society of North America, Inc·Marcela Hernández-HoyosIsabelle E Magnin
May 18, 2007·Radiology·Jean Marie U-King-ImJonathan H Gillard
Jun 22, 2007·Radiology·Tobias SaamChun Yuan
Jul 21, 2009·European Radiology·Annet WaaijerM Prokop
Aug 3, 2004·Radiology·Schila SabetiErich Minar
Oct 6, 2010·Academic Radiology·Do Yeon Kim
Aug 24, 2010·Journal of Neuroradiology. Journal De Neuroradiologie·M NonentP Douek
Apr 6, 2004·Magnetic Resonance Imaging·Do-Yeon Kim, Jong-Won Park
May 9, 2006·Lancet·J M WardlawUNKNOWN NHS Research and Development Health Technology Assessment Carotid Stenosis Imaging Group
Apr 8, 2015·Journal of Vascular and Interventional Radiology : JVIR·Mohammad Reza RajebiBarry T Katzen
Jul 8, 1999·Journal of Vascular Surgery·J GolledgeR M Greenhalgh
Apr 28, 2004·Neurology·J M U-King-ImJ H Gillard