"CT perfusion may be a useful adjunct 9 with relatively high sensitivity (82.1%) and specificity (79.6%), with changes in MTT most sensitive for the detection of delayed cerebral ischaemia 10 (MTT > 6.5 s, CBF < 25mL/100g/minute or 1.5 fold prolongation compared to baseline) 12."
"CT perfusion may be a useful adjunct 9 with relatively high sensitivity (82.1%) and specificity (79.6%), with changes in MTT most sensitive for the detection of delayed cerebral ischaemia 10 (MTT > 6.5 s, CBF < 25mL/100g/minute or 1.5 fold prolongation compared to baseline) 12."
"CT perfusion may be a useful adjunct 9 with relatively high sensitivity (82.1%) and specificity (79.6%), with changes in MTT most sensitive for the detection of delayed cerebral ischaemia 10 (MTT > 6.5 s, CBF < 25mL/100g/minute or 1.5 fold prolongation compared to baseline) 12."
"Vasospasm is also often seen on CT angiography, MR angiography, DSA, or transcranial Doppler ultrasound 9. Ischaemic areas do not always correspond to areas of arterial narrowing in vasospasm though the incidence increases in patients with more severe vasospasm 12."
"hypodensities on CT scans due to ventricular catheters or intraparenchymal haematomas (bleeding within the brain tissue) are not considered cerebral infarctions from delayed cerebral ischaemia"
"ischaemia should not be caused by other factors (e.g. surgical clipping or endovascular treatment)"