Stroke: Imaging - Wpxrays

Stroke: Imaging - Wpxrays

STROKE: IMAGING STROKE IMAGING STATISTICS NON-HAEMORRHAGIC STROKE 1. DIFFUSION WEIGHTED IMAGING (DWI) Sensitivity -90% Specificity -95% Accuracy -90% Positive Predictive Value -100% Negative Predictive Value -50% 2. CT SCANNING (UNCONTRASTED) Sensitivity 60% Specificity 65% Accuracy 60% Positive Predictive Value 95% Negative Predictive Value 10%

HAEMORRHAGIC STROKE 1. MRI Sensitivity 100% Specificity 100% Please note that care should be taken for the possibility for subarachnoid haemorrhage (SAH) which may be very difficult to see on MRI Scanning. 2. CT SCANNING Sensitivity 100% Specificity 100% Please note that abovementioned statistics apply to the hyperacute and acute stages of haemorrhagic stroke. Subacute may be isodense on CT. Chronic micro bleeds are definitely better seen on MRI Scanning compared to CT Scanning.

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