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→Choice of modality: +How soon
===Choice of modality===
*'''[[CT of the head in stroke]]''' is generally the first investigation because of high availability.<ref name=Radiologyassistant-stroke>{{cite web|url=http://www.radiologyassistant.nl/en/p483910a4b6f14/brain-ischemia-imaging-in-acute-stroke.html|title=Brain Ischemia - Imaging in Acute Stroke|website=Radiology Assistant|author=Majda Thurnher}} Published: June 2008</ref> It detects about 60% of infarcts in the first 3 to 6 hours, and almost always thereafter.<ref name=Radiologyassistant-stroke/>
*MRI of the head is more sensitive, but less available ===How soon===According to UK guidelines, imaging should be performed immediately for people with suspected acute stroke if any of the following apply:<ref name=nice>{{cite web|url=https://pathways.nice.org.uk/pathways/stroke/acute-stroke.pdf|title=Acute stroke|website=UK National Institute for Health and Care Excellence (NICE)}} Last updated: 18 December 2018}}*Indications for thrombolysis or early anticoagulation treatment*Current anticoagulant treatment*Any known bleeding tendency*Depressed level of consciousness (GCS <13)*Unexplained progressive or fluctuating symptoms*Papilledema, neck stiffness or fever*Severe headache at onset of stroke symptoms. "Immediately" is defined as 'ideally the next slot and definitely within 1 hour.<ref name=nice/> In case of acute stroke without indications for immediate imaging, it should be performed within a maximumof 24 hours after onset of symptoms.<ref name=nice/><noinclude>
==References==
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