Prospective evaluation of patients with subarachnoid hemorrhage (SAH) will be done by computed tomography angiography (CTA) and perfusion imaging (CTP) for any correlation between degree of vasospasm and perfusion deficit as well as evaluating the ability of CTP to predict delayed cerebral ischemia.
Cerebral vasospasm is a serious complication of subarachnoid haemorrhage . In the first 2 weeks of SAH, angiographic vasospasm is seen up to 40-70% of patients and causes ischemic deficits in 15-36% of patients. The best clinical indicator of significantly reduced brain perfusion (cerebral blood flow (CBF)\<20 ml per 100 g/min) is the presence of new neurologic deficits. However, clinical symptoms may be vague and mimic other conditions in patients with SAH. CT Perfusion can be used in the evaluation of patients with possible vasospasm after subarachnoid hemorrhage (SAH). It can thus be used to assess cerebral ischemia and infarction as a result of vasospasm after SAH. The presence of cerebral vasospasm identified with transcranial Doppler, digital subtraction angiography, or CT angiography (CTA) is frequently used to confirm DCI. Presence of vasospasm, however, does not prove the presence of ischemia and absence of vasospasm does not rule out. Better diagnostic tests in the acute stage of deterioration, possibly caused by DCI, are therefore needed. In patients with SAH, CTP has recently been shown to be promising for detection of early ischemia.
Study Type
OBSERVATIONAL
Enrollment
64
Mohamed Abdel-Tawab Mohamed
Asyut, Egypt
Cerebral blood flow (CBF) on Admission
Cerebral blood flow (CBF) on Admission in units of ml/100 gram brain tissue/ minute. The measurements will be compared with the outcome of the patient (namely monitoring delayed cerebral ischemia in SAH patients) to test if early CT perfusion could predict the poor outcome in SAH patients.
Time frame: 3 days from the attack
Cerebral blood volume (CBV) on Admission
Cerebral blood volume (CBF) on Admission in units of ml/100 gram brain tissue.
Time frame: 3 days from the attack
Mean transit time (MTT) on Admission
Mean transit time (MTT) on Admission in units of seconds.
Time frame: 3 days from the attack
Correlation of vasospasm to perfusion abnormality using Comparing between CT angiography and CT perfusion in patients with subarachnoid hemorrhage
Evaluating results of CT angiography and CT perfusion in patients for Correlating vasospasm and perfusion abnormality. Results will be dichotomous; positive and negative, then tested by cross tabulation.
Time frame: 4-14 days from the attack
Hunt and Hess scale
Hunt and Hess clinical scale was performed for every patient. Grades are as the following: Grade 1: Asymptomatic or mild headache Grade 2: Cranial nerve palsy or moderate to severe headache/nuchal rigidity Grade 3: Mild focal deficit, lethargy, or confusion Grade 4: Stupor and/or hemiparesis Grade 5: Deep coma, decerebrate posturing, moribund appearance
Time frame: 3 days from the attack
Fisher scale
Fisher scale quantifies the amount of SAH as the following: 1. None evident 2. Less than 1 mm thick 3. More than 1 mm thick 4. Diffuse or none with intraventricular hemorrhage or parenchymal extension
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.
Time frame: 3 days from the attack