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type=\u0022text\/css\u0022 rel=\u0022stylesheet\u0022 href=\u0022\/\/d282kpwvnogo5m.cloudfront.net\/sites\/default\/files\/advagg_css\/css__ce2QY63WIanKyr8eSq7eavr1XQRRmFD6ZSmwpyJi8lM__zXwFqpqmxrZOXXcd_TpBQpjuELbmIP9wBR5UuTDWAO4__YJWWMMdfCJuAFm5cUEp88OsodhO3ZA-2lzRfoBsSlk4.css\u0022 media=\u0022all\u0022 \/\u003E\n\u003Clink rel=\u0027stylesheet\u0027 type=\u0027text\/css\u0027 href=\u0027\/sites\/all\/modules\/contrib\/panels\/plugins\/layouts\/onecol\/onecol.css\u0027 \/\u003E\u003C\/head\u003E\u003Cbody\u003E\u003Cdiv class=\u0022panels-ajax-tab-panel panels-ajax-tab-panel-sageoa-tab-art\u0022\u003E\u003Cdiv class=\u0022panel-display panel-1col clearfix\u0022 \u003E\n  \u003Cdiv class=\u0022panel-panel panel-col\u0022\u003E\n    \u003Cdiv\u003E\u003Cdiv class=\u0022panel-pane pane-highwire-markup\u0022 \u003E\n  \n      \n  \n  \u003Cdiv class=\u0022pane-content\u0022\u003E\n    \u003Cdiv class=\u0022highwire-markup\u0022\u003E\u003Cdiv xmlns=\u0022http:\/\/www.w3.org\/1999\/xhtml\u0022 id=\u0022content-block-markup\u0022 xmlns:xhtml=\u0022http:\/\/www.w3.org\/1999\/xhtml\u0022\u003E\u003Cdiv class=\u0022article fulltext-view \u0022\u003E\u003Cspan class=\u0022highwire-journal-article-marker-start\u0022\u003E\u003C\/span\u003E\u003Cdiv class=\u0022section abstract\u0022 id=\u0022abstract-1\u0022\u003E\u003Ch2\u003ESummary\u003C\/h2\u003E\n            \u003Cp id=\u0022p-1\u0022\u003EThe CADISS trial investigated the efficacy of antiplatelet vs anticoagulant treatment in preventing stroke in patients with acute cervical artery dissection. The feasibility phase revealed that the sample size for a definitive study would have to be approximately 10\u2009000 patients. However, it showed that recurrent stroke rate was much lower than previously reported.\u003C\/p\u003E\n         \u003C\/div\u003E\u003Cul class=\u0022kwd-group\u0022\u003E\u003Cli class=\u0022kwd\u0022\u003Eacute cervical dissection\u003C\/li\u003E\u003Cli class=\u0022kwd\u0022\u003Eanticoagulant\u003C\/li\u003E\u003Cli class=\u0022kwd\u0022\u003Eantiplatelet\u003C\/li\u003E\u003Cli class=\u0022kwd\u0022\u003ECADISS\u003C\/li\u003E\u003Cli class=\u0022kwd\u0022\u003Estroke\u003C\/li\u003E\u003C\/ul\u003E\u003Cdiv class=\u0022section\u0022 id=\u0022sec-1\u0022\u003E\n         \n         \u003Cp id=\u0022p-2\u0022\u003EHugh S. Markus, BM Bch, University of Cambridge, Cambridge, United Kingdom, presented the first results of the Cervical Arterial Dissection in Stroke Study (CADISS) trial [\u003Ca href=\u0022\/external-ref?link_type=ISRCTN\u0026amp;access_num=ISRCTN44555237\u0022 class=\u0022external-ref external-ref-type-isrctn\u0022\u003EISRCTN44555237\u003C\/a\u003E]. The CADISS trial demonstrated that the recurrent stroke rate due to cervical artery dissection appears to be low, with no significant difference in outcome by using antiplatelet vs anticoagulant treatment for future stroke prevention. Investigators also determined that the number of patients needed to show a difference between treatment arms was high and could be challenging to obtain.\u003C\/p\u003E\n         \u003Cp id=\u0022p-3\u0022\u003ECarotid and vertebral dissection is an important cause of stroke in young and middle-aged patients, accounting for up to 25% of cases [Beletsky V et al. \u003Cem\u003EStroke\u003C\/em\u003E. 2003; Touz\u00e9 E et al. \u003Cem\u003ENeurology\u003C\/em\u003E. 2003]. It carries an associated risk of recurrent stroke, although the reported numbers vary widely, depending on the study reviewed. Physicians usually prescribe either anticoagulation or antiplatelet agents to prevent recurrent strokes; however, data from randomized controlled trials showing the superiority of one treatment over another are currently lacking, with some nonrandomized data providing inconclusive results [Kennedy F et al. \u003Cem\u003ENeurology\u003C\/em\u003E. 2012].\u003C\/p\u003E\n         \u003Cp id=\u0022p-4\u0022\u003ECADISS was a randomized, open-label trial, with blinded adjudication of end points [Markus HS et al. \u003Cem\u003EInt J Stroke\u003C\/em\u003E. 2007]. The primary aim was to determine whether antiplatelet vs anticoagulation treatment was more effective at preventing stroke in patients with acute cervical dissection. The secondary aim was to measure the frequency of recurrent stroke in this population. Initially, 250 patients were recruited in order to establish whether there would be a sufficient number of clinical end points to determine a treatment effect, and if an adequate number of patients can be feasibly recruited. The primary end point was ipsilateral stroke or death at 3 months. Eligible patients had to have symptoms of ipsilateral stroke or transient ischemic attack, or ipsilateral Horner syndrome, neck pain, or headache within 7 days of recruitment.\u003C\/p\u003E\n         \u003Cp id=\u0022p-5\u0022\u003EOut of 250 patients, 126 were randomized to antiplatelets and 124 to anticoagulants. End points included 4 ipsilateral strokes (all in patients presenting with stroke; 3 in antiplatelet group and 1 in anticoagulant group) and 1 subarachnoid hemorrhage (in anticoagulant group). No deaths were reported. The overall stroke rate was strikingly low at 1.6% (2.1% in those presenting with stroke or transient ischemic attack). Given the low number of events, the difference between treatment arms was not significant (\u003Ca id=\u0022xref-table-wrap-1-1\u0022 class=\u0022xref-table\u0022 href=\u0022#T1\u0022\u003ETable 1\u003C\/a\u003E).\u003C\/p\u003E\n         \u003Cdiv id=\u0022T1\u0022 class=\u0022table pos-float\u0022\u003E\u003Cdiv class=\u0022table-inline\u0022\u003E\u003Cdiv class=\u0022callout\u0022\u003E\u003Cspan\u003EView this table:\u003C\/span\u003E\u003Cul class=\u0022callout-links\u0022\u003E\u003Cli class=\u00220 first\u0022\u003E\u003Ca href=\u0022\/\u0022 class=\u0022table-expand-inline\u0022 data-table-url=\u0022\/highwire\/markup\/15252\/expansion?postprocessors=highwire_figures%2Chighwire_math%2Chighwire_inline_linked_media%2Chighwire_embed\u0026amp;table-expand-inline=1\u0022 html=\u00221\u0022 fragment=\u0022#\u0022 external=\u00221\u0022 data-icon-position=\u0022\u0022 data-hide-link-title=\u00220\u0022\u003EView inline\u003C\/a\u003E\u003C\/li\u003E\u003Cli class=\u00221\u0022\u003E\u003Ca href=\u0022\/highwire\/markup\/15252\/expansion?width=1000\u0026amp;height=500\u0026amp;iframe=true\u0026amp;postprocessors=highwire_figures%2Chighwire_math%2Chighwire_inline_linked_media\u0022 class=\u0022colorbox colorbox-load table-expand-popup\u0022 rel=\u0022gallery-fragment-tables\u0022 data-icon-position=\u0022\u0022 data-hide-link-title=\u00220\u0022\u003EView popup\u003C\/a\u003E\u003C\/li\u003E\u003Cli class=\u00222 last\u0022\u003E\u003Ca href=\u0022\/highwire\/powerpoint\/15252\u0022 class=\u0022highwire-figure-link highwire-figure-link-ppt\u0022 data-icon-position=\u0022\u0022 data-hide-link-title=\u00220\u0022\u003EDownload powerpoint\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table-caption\u0022\u003E\u003Cspan class=\u0022table-label\u0022\u003ETable 1.\u003C\/span\u003E \n               \u003Cp id=\u0022p-6\u0022 class=\u0022first-child\u0022\u003EAssociation Between Treatment and Risk of End Point Event in ITT Population\u003C\/p\u003E\n            \u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\n         \u003Cp id=\u0022p-9\u0022\u003EA predefined per-protocol analysis was also performed after excluding patients whose diagnosis of dissection could not be confirmed by reviewing their imaging data. Overall, 53 patients were excluded. The per-protocol analysis included 197 patients. There were 3 per-protocol end point events (defined as stroke, major bleeding, or death) among 101 patients in the antiplatelet group and 2 among 96 patients in the anticoagulant group (\u003Ca id=\u0022xref-table-wrap-2-1\u0022 class=\u0022xref-table\u0022 href=\u0022#T2\u0022\u003ETable 2\u003C\/a\u003E), with insignificant difference between treatment arms.\u003C\/p\u003E\n         \u003Cdiv id=\u0022T2\u0022 class=\u0022table pos-float\u0022\u003E\u003Cdiv class=\u0022table-inline\u0022\u003E\u003Cdiv class=\u0022callout\u0022\u003E\u003Cspan\u003EView this table:\u003C\/span\u003E\u003Cul class=\u0022callout-links\u0022\u003E\u003Cli class=\u00220 first\u0022\u003E\u003Ca href=\u0022\/\u0022 class=\u0022table-expand-inline\u0022 data-table-url=\u0022\/highwire\/markup\/15253\/expansion?postprocessors=highwire_figures%2Chighwire_math%2Chighwire_inline_linked_media%2Chighwire_embed\u0026amp;table-expand-inline=1\u0022 html=\u00221\u0022 fragment=\u0022#\u0022 external=\u00221\u0022 data-icon-position=\u0022\u0022 data-hide-link-title=\u00220\u0022\u003EView inline\u003C\/a\u003E\u003C\/li\u003E\u003Cli class=\u00221\u0022\u003E\u003Ca href=\u0022\/highwire\/markup\/15253\/expansion?width=1000\u0026amp;height=500\u0026amp;iframe=true\u0026amp;postprocessors=highwire_figures%2Chighwire_math%2Chighwire_inline_linked_media\u0022 class=\u0022colorbox colorbox-load table-expand-popup\u0022 rel=\u0022gallery-fragment-tables\u0022 data-icon-position=\u0022\u0022 data-hide-link-title=\u00220\u0022\u003EView popup\u003C\/a\u003E\u003C\/li\u003E\u003Cli class=\u00222 last\u0022\u003E\u003Ca href=\u0022\/highwire\/powerpoint\/15253\u0022 class=\u0022highwire-figure-link highwire-figure-link-ppt\u0022 data-icon-position=\u0022\u0022 data-hide-link-title=\u00220\u0022\u003EDownload powerpoint\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table-caption\u0022\u003E\u003Cspan class=\u0022table-label\u0022\u003ETable 2.\u003C\/span\u003E \n               \u003Cp id=\u0022p-10\u0022 class=\u0022first-child\u0022\u003EIncidence of End Point Events by Treatment in Per-Protocol Population\u003C\/p\u003E\n            \u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\n         \u003Cp id=\u0022p-14\u0022\u003EThe power calculation revealed that the sample size for a definitive study would have to be 9752 patients (power set to 0.8 and significance to 0.05). However, Prof Markus mentioned that although it would be very challenging to recruit such a large number of patients, this was a rather wide estimate because of the low number of end points.\u003C\/p\u003E\n         \u003Cp id=\u0022p-15\u0022\u003EIn conclusion, Prof Markus highlighted that the recurrent stroke rate in the CADISS trial was much lower than that reported in some observational studies. He also cautioned that the diagnosis of dissection was not confirmed in 20% of cases, suggesting that diagnostic criteria may not always be properly applied in clinical practice.\u003C\/p\u003E\n      \u003C\/div\u003E\u003Cul class=\u0022copyright-statement\u0022\u003E\u003Cli class=\u0022fn\u0022 id=\u0022copyright-statement-1\u0022\u003E\u00a9 2015 SAGE Publications\u003C\/li\u003E\u003C\/ul\u003E\u003Cspan class=\u0022highwire-journal-article-marker-end\u0022\u003E\u003C\/span\u003E\u003C\/div\u003E\u003Cspan id=\u0022related-urls\u0022\u003E\u003C\/span\u003E\u003C\/div\u003E\u003Ca href=\u0022http:\/\/mdc.sagepub.com\/content\/15\/2\/10.abstract\u0022 class=\u0022hw-link hw-link-article-abstract\u0022 data-icon-position=\u0022\u0022 data-hide-link-title=\u00220\u0022\u003EView Summary\u003C\/a\u003E\u003C\/div\u003E  \u003C\/div\u003E\n\n  \n  \u003C\/div\u003E\n\u003C\/div\u003E\n  \u003C\/div\u003E\n\u003C\/div\u003E\n\u003C\/div\u003E\u003Cscript type=\u0022text\/javascript\u0022 src=\u0022http:\/\/mdc.sagepub.com\/sites\/all\/modules\/highwire\/highwire\/plugins\/highwire_markup_process\/js\/highwire_openurl.js?nzlqk4\u0022\u003E\u003C\/script\u003E\n\u003Cscript type=\u0022text\/javascript\u0022 src=\u0022http:\/\/mdc.sagepub.com\/sites\/all\/modules\/highwire\/highwire\/plugins\/highwire_markup_process\/js\/highwire_tables.js?nzlqk4\u0022\u003E\u003C\/script\u003E\n\u003C\/body\u003E\u003C\/html\u003E"}