Jugular Anomalies in Multiple Sclerosis Are Associated with Increased Collateral Venous Flow

Area of Science:

• Neurology
• Medical Imaging
• Vascular Biology

Background:

• Extracranial venous collateral research has historically focused on structure, neglecting hemodynamics.
• Understanding venous flow dynamics is crucial for neurological conditions like multiple sclerosis (MS).

Purpose of the Study:

• To quantitatively compare collateral venous flow in patients with MS versus healthy controls using phase-contrast MR imaging.
• To investigate the relationship between internal jugular vein (IJV) stenosis and collateral flow in MS patients.

Main Methods:

• Phase-contrast MR imaging was used to quantify venous flow in 276 MS patients and 106 healthy controls.
• Internal jugular veins were classified as stenotic or nonstenotic based on cross-sectional area.
• Venous drainage was categorized into three types: IJV (I), paraspinal (II), and superficial (III).

Main Results:

• 55% of MS patients exhibited IJV stenosis, compared to 20% of controls (P < .001).
• MS patients had significantly lower type I (IJV) flow and higher type II (paraspinal) flow than controls.
• IJV stenosis in MS patients was associated with reduced type I flow and increased type II flow.

Conclusions:

• Multiple sclerosis patients demonstrate reduced venous flow in the internal jugular vein.
• Elevated flow in paraspinal venous collaterals is observed in MS patients, particularly those with IJV stenosis.
• Increased paraspinal venous flow may represent a compensatory mechanism for reduced IJV drainage in MS.