Spinal Cord Infarction (Spinal Stroke)

🧠 Standard of Care & Symptoms

Spinal Cord Infarction, commonly referred to as a spinal stroke, is a rare form of stroke caused by a sudden reduction or blockage of blood supply to the spinal cord. It presents as an acute, vascular neurological emergency.

• Presentation: Key diagnostic signs.
  • *Sudden Back/Radicular Pain:* Abrupt, severe pain localized in the neck or back, often radiating in a band-like pattern around the chest or abdomen.
  • *Rapid-Onset Paraplegia:* Symmetrical weakness or paralysis (quadriplegia if cervical, paraplegia if thoracic/lumbar) that develops over minutes to hours. Early presentation shows flaccid paralysis due to spinal shock.
  • *Dissociated Sensory Loss:* Loss of pain and temperature sensation below the level of the injury, with relative preservation of light touch, vibration, and proprioception.
  • *Autonomic Dysfunction:* Neurogenic bladder (urinary retention), bowel dysfunction, and a risk of neurogenic shock (bradycardia, hypotension) in high thoracic or cervical lesions.

🧬 Diagnostics & Vascular Pathophysiology

Diagnosis requires urgent spinal MRI to identify ischemic changes and rule out compressive myelopathies, alongside vascular imaging of the aorta.

• Diagnostic Markers: Key criteria.
  • Spine MRI: demonstrates hyperintensity on T2-weighted images and restricted diffusion on DWI. On axial sections, T2 hyperintensity in the anterior horns of the gray matter creates the characteristic **"owl's eye" sign**.
  • Aortic Angiography (CT/MR): Evaluates the patency of the aorta and major feeding arteries (like the artery of Adamkiewicz) to check for dissection or severe stenosis.
  • Lumbar Puncture: Primarily performed if MRI is non-diagnostic, to rule out infectious or inflammatory conditions like Transverse Myelitis. CSF is typically normal in infarction.

Pathophysiology of Spinal Cord Ischemia

The clinical syndrome of spinal stroke is determined by the specific vascular territory affected:

• Anterior Spinal Artery (ASA) Syndrome: The ASA supplies the anterior two-thirds of the spinal cord. Blockage of this artery selectively damages the **spinothalamic tracts** (carrying pain/temperature) and the **corticospinal tracts** (carrying motor output), while sparing the posterior columns (carrying proprioception and vibration), which are supplied by the dual posterior spinal arteries.
• Artery of Adamkiewicz Vulnerability: The lower thoracic and lumbar spinal cord segments rely heavily on the **artery of Adamkiewicz** (a major radiculomedullary artery branching from a lower intercostal artery). Surgical procedures involving the aorta (e.g. repair of aortic aneurysms) risk interrupting this artery, leading to paraplegia.
• Spinal Shock: Acute ischemia leads to an immediate loss of reflex activity below the lesion (flaccid paralysis). Over weeks, this transitions to spasticity, hyperreflexia, and Babinski signs as upper motor neuron pathways degenerate.

💊 Acute Perfusion & Rehabilitation

Treatment in the acute phase focuses on maintaining spinal cord blood flow. Long-term management relies on preventing complications and aggressive physical therapy.

Acute Perfusion Management

• Perfusion Pressure Optimization: Crucial in the first 24-72 hours. Standard protocols involve keeping the **Mean Arterial Pressure (MAP)** elevated at 85-90 mmHg (using intravenous fluids and vasopressors if necessary) to maximize collateral blood flow to the ischemic spinal cord.
• Cerebrospinal Fluid (CSF) Drainage: In patients with suspected progressive ischemia (especially post-aortic surgery), a lumbar drain is placed to lower CSF pressure. Reducing CSF pressure increases the **spinal cord perfusion pressure** (MAP minus CSF pressure).

Rehabilitative & Autonomic Support

• Neurogenic Bladder Management: Clean intermittent catheterization is initiated to prevent bladder distension and urinary tract infections.
• Intensive Physical & Occupational Therapy: Initiated as soon as hemodynamic stability is achieved. Focuses on maintaining range of motion, strengthening remaining muscle groups, and training in mobility aids (wheelchairs, braces).

🔬 Active Clinical Trials

Clinical trials are currently evaluating spinal cord perfusion pressure targets, cerebrospinal fluid drainage protocols, and advanced rehabilitation devices.

🗺️ Next Steps After Diagnosis

If you have recently suffered a Spinal Cord Infarction, establish these clinical care pathways:

1. Undergo Aortic Evaluation: Ensure your vascular team has completed CT or MR angiography of the thoracic and abdominal aorta to rule out aortic dissection.
2. Optimize Blood Pressure Targets: Work with your medical team to maintain your blood pressure within safe ranges, avoiding sudden drops.
3. Initiate Deep Vein Thrombosis (DVT) Prophylaxis: Discuss antiplatelet therapy, anticoagulation, or sequential compression devices to prevent blood clots in the legs.
4. Select a Specialized Rehabilitation Center: Transfer early to a rehabilitation facility experienced in spinal cord injury care to maximize functional recovery.

❓ Patient FAQ

Q: What is the difference between a spinal stroke and a brain stroke?
A: Both are caused by blocked blood flow (ischemia) or bleeding. A brain stroke affects the brain, causing symptoms like facial drooping, speech difficulty, and weakness on one side of the body. A spinal stroke affects the spinal cord, causing sudden back pain, weakness/paralysis on both sides of the body below the injury level, and loss of pain/temperature sensation.

Q: Can you recover from a spinal cord infarction?
A: Recovery varies. Some patients experience significant recovery of mobility and bladder control over months of rehabilitation, while others may have permanent paralysis. Early recognition, optimizing blood pressure, and early rehabilitation are the most critical factors for a positive outcome.