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Updated: Jul 18, 2026
10:34
Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
Published on: August 30, 2020
[Non-aneurysmal subarachnoid hemorrhage: 60 cases].
1Servicio de Neurología, Hospital de Sabadell, Barcelona. davidcanovas2000@yahoo.es
Neurologia (Barcelona, Spain)
|November 16, 2006
Summary
Spontaneous subarachnoid hemorrhage (SAH) patients with a perimesencephalic pattern (PMP) on CT scans show excellent long-term prognoses. This non-aneurysmal SAH subgroup experienced minimal complications and favorable outcomes, highlighting their distinct clinical trajectory.
Area of Science:
- Neurology
- Radiology
- Neurosurgery
Background:
- Spontaneous subarachnoid hemorrhage (SAH) is idiopathic in 15% of cases.
- Non-aneurysmal SAH patients exhibit different characteristics compared to those with aneurysmal etiology.
- Perimesencephalic pattern (PMP) on CT scans identifies a subgroup of idiopathic SAH patients.
Purpose of the Study:
- To analyze the symptomatology, complications, and long-term evolution of spontaneous subarachnoid hemorrhage (SAH) patients.
- To identify subgroups within non-aneurysmal SAH with distinct prognoses.
- To evaluate the prognosis of SAH patients with a perimesencephalic pattern (PMP).
Main Methods:
- Retrospective follow-up study of 60 SAH patients admitted between 1992 and 2000.
- Patients were categorized into three groups based on CT imaging: perimesencephalic pattern (PMP), aneurysmal pattern (AP), and normal CT with arteriography.
- Follow-up duration ranged from 6 to 24 months.
Main Results:
- SAH patients with PMP (n=26) were all Hunt-Hess grade I-II, experienced no complications, and 84% were asymptomatic long-term.
- SAH patients with AP (n=28) had varied Hunt-Hess grades (I-IV), with one death from rebleeding and two requiring hydrocephalus drainage.
- Long-term, 68% of AP patients were asymptomatic, while the remainder reported headaches.
Conclusions:
- Non-aneurysmal SAH demonstrates favorable short- and long-term outcomes.
- SAH patients with a perimesencephalic pattern (PMP) exhibit an excellent prognosis with minimal complications.
- Identifying the perimesencephalic pattern is crucial for predicting favorable outcomes in spontaneous subarachnoid hemorrhage.
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