Professional
Technical
IVT
Fisher grade
Radiological classification system for subarachnoid hemorrhage based on CT appearance and blood distribution.
Full Definition
The Fisher grade is a widely used classification system that categorizes subarachnoid hemorrhage based on the appearance and distribution of blood on computed tomography scans. Grade 1 indicates no blood detected, Grade 2 shows diffuse thin layer of blood, Grade 3 demonstrates thick clots or layers of blood, and Grade 4 reveals intracerebral or intraventricular hemorrhage. This grading system helps predict the risk of developing delayed cerebral ischemia and guides clinical decision-making in neurocritical care.
Usage
Usage note: Always capitalize 'Fisher' as it is named after Dr. Charles Miller Fisher.
In Context
- "The radiologist assigned a Fisher grade 3 to the patient's subarachnoid hemorrhage on the admission CT." — radiology report
- "Patients with Fisher grade 3 or 4 hemorrhages require intensive monitoring for vasospasm." — clinical protocol
Also known as
Fisher scale
Don't confuse with
Hunt and Hess grade
modified Fisher grade