Examined II

Cardiovascular System


{"ops":[{"insert":"Stroke mimics and chameleons"},{"insert":"\n","attributes":{"header":1}},{"insert":"A \u0022stroke mimic\u0022 is a clinical syndrome suggestive of stroke, yet not caused by an ischemic event. These include seizures, central nervous system (CNS) infections, cerebral tumors, and toxic or metabolic disturbances.\n\nA \u0022stroke chameleon\u0022 is the opposite: a clinical syndrome that does not appear to represent a stroke initially, but is later found to be so. Examples include malaise, loss of consciousness, encephalopathy, and even acute psychosis.\nNeuroimaging of stroke"},{"insert":"\n","attributes":{"header":1}},{"insert":"In the patient with a suspected acute stroke, neuroimaging via either computed tomograpy (CT) or magnetic resonance imaging (MRI) is mandatory.\n\nNoncontrast CT is widely available, fast, and cheaper than MRI. It reliably identifies most stroke mimics, and distinguishes ischemia from hemorrhage within the first 5 to 7 days. Exposure to ionizing radiation is the main downsite.\n\nMRI avoids exposure to ionizing radiation. It also has better spatial resolution, detects smaller infarcts, and can differentiate acute from chronic ischemia. However, it is of limited availability, takes longer to perform, and may be contraindicated due to the presence of metal implants, or claustrophobia.\nCT features of ischemia"}]}

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