Cerebral venous blood flow regulates intracerebral pressure and brain clearance via meningeal lymphatic vessels.

Summary

In IIH patients, dural venous sinus stenoses correlated with altered perivenous fluid patterns and brain edema. In mice, jugular vein ligation induced transient intracerebral hypertension, edema, and impaired clearance, worsened by meningeal lymphatic vessel (MLV) depletion; only MLV-intact animals restored clearance. These data implicate venous flow–MLV coupling as a controller of intracerebral pressure and brain clearance.

Key Findings

• In IIH, dural venous sinus stenoses were associated with altered perivenous fluid patterns and brain edema on MRI.
• Jugular vein ligation in mice caused transient intracerebral hypertension, edema, and impaired brain fluid clearance.
• Meningeal lymphatic vessel depletion elevated intracerebral pressure and prevented clearance recovery after venous ligation, implicating MLVs in ICP control.

Clinical Implications

For neuroanesthesiology and neurocritical care, assessment of venous outflow and preservation of meningeal lymphatic function may be crucial in IIH and intracranial hypertension management; it supports physiologic rationale for venous stenting and motivates research into lymphatic-modulating strategies.

Limitations

• Human sample size and generalizability are not specified in the abstract
• Mouse jugular ligation may not capture all aspects of human IIH pathophysiology

Future Directions

Prospective clinical studies quantifying venous outflow, MLV structure/function, and intracranial pressure dynamics; interventional trials testing lymphatic-modulating or venous-targeted therapies.