Spinal DAVFs: Fixing Abnormal Blood Connections Before They Cause Paralysis

Spinal DAVFs: Fixing Abnormal Blood Connections Before They Cause Paralysis

A Spinal Dural Arteriovenous Fistula (SDAVF) is a rare but debilitating vascular condition affecting the spinal cord. It occurs when an abnormal direct connection forms between a small spinal artery and a spinal vein within the outer covering of the spinal cord (the dura mater).

Because symptoms develop gradually and mimic common degenerative spine conditions, SDAVFs are often misdiagnosed, delaying treatment until significant neurological deficits occur.

The Pathophysiology: How SDAVFs Cause Injury

Under normal conditions, high-pressure arterial blood flows into micro-capillaries to nourish tissue before entering low-pressure veins. In an SDAVF, arterial blood flows directly into the venous plexus surrounding the spinal cord without passing through a capillary bed.

This direct connection causes venous hypertension:

• High pressure backs up into the veins draining the spinal cord.
• Venous congestion prevents normal deoxygenated blood from leaving the spinal cord tissue.
• Severe tissue swelling (edema) and progressive hypoxia (lack of oxygen) develop, leading to progressive spinal cord dysfunction (myelopathy).

Recognizing Early vs. Advanced Symptoms

Symptoms typically emerge in adults over age 50 and gradually worsen over months or years:

• Initial Symptoms: Progressive leg weakness, heavy-legged sensation while walking, numbness or tingling starting in the feet and climbing upward, and chronic lower back or leg aching.
• Advanced Symptoms: Severe gait instability, loss of lower extremity motor control, and bowel or bladder incontinence.

Diagnostic and Neurosurgical Solutions

Diagnosis requires specialized imaging, beginning with high-resolution spinal MRI (showing spinal cord swelling and enlarged, tortuous veins) and confirmed by spinal digital subtraction angiography.

Once mapped, treatment focuses on permanently disconnecting the abnormal fistula:

• Microsurgical Ligation: A neurosurgeon performs a localized laminectomy to expose the dura, identifies the single fistulous connection, and clips or severs the vessel, immediately normalizing venous pressure.
• Endovascular Embolization: In select candidates, an interventional specialist navigates a microcatheter to inject liquid embolic material directly into the fistula to close the connection.

Early intervention stops disease progression and preserves critical spinal cord function.

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