Characterization of risk factor differences in perimesencephalic subarachnoid hemorrhage

Area of Science:

• Neurology
• Vascular Neurology
• Epidemiology

Background:

• Perimesencephalic subarachnoid hemorrhage (p-SAH) is associated with a better prognosis compared to aneurysmal subarachnoid hemorrhage (a-SAH).
• Understanding the distinct risk factors for p-SAH is crucial for explaining its favorable outcome.
• Previous research has not fully elucidated the specific risk profiles differentiating p-SAH from a-SAH.

Purpose of the Study:

• To identify and compare the risk factors associated with perimesencephalic subarachnoid hemorrhage (p-SAH) versus aneurysmal subarachnoid hemorrhage (a-SAH).
• To provide a rationale for the more favorable prognosis observed in p-SAH cases.
• To investigate the influence of hypertension, body weight, smoking, hematocrit, fibrinogen, and leukocrit on the incidence of different types of subarachnoid hemorrhage.

Main Methods:

• A hospital-based case-control study involving 185 consecutive subarachnoid hemorrhage cases.
• Data collected between September 1994 and August 1998.
• Investigation of hypertension, body weight, smoking, hematocrit, fibrinogen, and leukocrit as potential risk factors.

Main Results:

• Hypertension, smoking, and hematocrit were identified as significant risk factors for subarachnoid hemorrhage (SAH) in the overall study group.
• Hypertensive individuals had an increased risk of experiencing SAH (Odds Ratio = 3.54).
• Patients with p-SAH exhibited a different risk profile compared to a-SAH patients, particularly concerning blood pressure and hemorheological parameters.

Conclusions:

• A distinct association exists between risk factors and the two types of subarachnoid hemorrhage (p-SAH and a-SAH).
• Perimesencephalic SAH cases appear to have fewer associated risk factors when compared to typical aneurysmal hemorrhages.
• These findings contribute to understanding the etiological differences and prognostic variations between p-SAH and a-SAH.