Delayed CSF lavage for arteriographic and morphological vasospasm after experimental SAH

Area of Science:

• Neurosurgery
• Neurology
• Vascular Biology

Background:

• Subarachnoid hemorrhage (SAH) can lead to arterial vasospasm.
• Cerebrospinal fluid (CSF) lavage is a potential intervention to mitigate SAH complications.

Purpose of the Study:

• To investigate the efficacy of cisternal lavage in a canine model of vasospasm following SAH.
• To determine if lavage 24 hours after SAH affects vasospasm, neurological deficits, or vascular morphology.

Main Methods:

• A two-hemorrhage canine model was used.
• Twelve dogs underwent basilar cistern lavage with artificial CSF 24 hours after SAH; 12 controls did not receive lavage.
• Clot burden, neurological status, angiographic vasospasm, and arterial morphology were assessed.

Main Results:

• Lavage significantly reduced gross clot burden compared to controls (median grade 1 vs. 2, p < 0.001).
• No significant differences were observed in neurological grades between groups.
• Angiographic assessment showed similar degrees of basilar artery diameter reduction in both lavaged and control dogs (28.8% vs. 21.6%, p > 0.05).
• Trends towards reduced endothelial desquamation in lavaged dogs were not statistically significant (p = 0.06).

Conclusions:

• Cisternal lavage 24 hours after SAH in this model does not prevent angiographic, neurological, or major morphological consequences of vasospasm.
• The timing of intervention is critical, suggesting clot-vessel interactions leading to vasospasm occur earlier than 24 hours post-SAH.
• Further studies evaluating earlier lavage times are warranted to understand vasospasm initiation after SAH.