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Changes on CT Scan in Haemorrhagic Stroke

Changes on CT Scan in Haemorrhagic Stroke. Musarrat Ansari. Haemorrhagic Stroke. 2 main types: Intracerebral haemorrhage - Occurs due to rupture of micro-aneurysms on branches of eg middle cerebral arteries. Subarachnoid haemorrhage

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Changes on CT Scan in Haemorrhagic Stroke

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  1. Changes on CT Scan in Haemorrhagic Stroke Musarrat Ansari

  2. Haemorrhagic Stroke 2 main types: • Intracerebral haemorrhage - Occurs due to rupture of micro-aneurysms on branches of eg middle cerebral arteries. • Subarachnoid haemorrhage - Rupture of berry aneurysms into the subarachnoid space.

  3. Intracerebral Haemorrhage (ICH) Most common locations of spontaneous ICH are: • Lobar (40 – 50%) • Putamen (40%) • Cerebellum (5 – 10%) • Thalamus (5%) • Pons (5%)

  4. Intracerebral Haemorrhage • Haematomas increase in size 1-2 hours after onset and may continue to increase for 12 hours or longer. • Deeply placed haematomas are characteristic of hypertension. • Most episodes of bleeding start at times of the day when arterial pressures are higher. • Bleeding is often initiated at the junction of gray and white matter.

  5. CT Scans Showing Intracerebral Haemorrhage

  6. Subarachnoid Haemorrhage (SAH) • sensitivity of head CT for subarachnoid hemorrhage varies with time course: • acutely 95-100% • after 5 days 85% • after 7 days 50%

  7. Delayed Cerebral Ischaemia After SAH • Peak frequency from day 5 to day 14. • Occurrence strongly related to the total amount of subarachnoid blood – occurs only if source is a ruptured aneurysm. • Loss of consciousness at time of haemorrhage is an important predictive factor for delayed cerebral ischaemia.

  8. Haemorrhagic Transformation After Infarction

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