Carotid Artery Dissection

Overview

Carotid artery dissection (CAD) occurs when a tear forms in the inner lining (intima) of one of the carotid arteries, the major vessels that supply blood to the brain. Blood can enter the arterial wall, creating a false lumen that narrows or blocks the true lumen, potentially leading to reduced cerebral perfusion or embolic stroke. CAD is an important cause of ischemic stroke in young and middle‑aged adults, accounting for up to 20 % of strokes in patients under 45 years of age.¹

Symptoms Checklist

• Sudden, severe neck or facial pain (often described as “sharp” or “stabbing”).
• Headache, especially on the same side as the dissection.
• Pulsatile tinnitus (a whooshing sound in the ear).
• Partial or complete Horner’s syndrome (ptosis, miosis, anhidrosis).
• Transient ischemic attack (TIA) symptoms: brief weakness, numbness, or speech difficulty.
• Stroke symptoms: sudden weakness or paralysis on one side, facial droop, difficulty speaking, vision changes, loss of coordination.
• Visual disturbances (e.g., double vision, visual field loss).

Risk Factors

While CAD can occur spontaneously, several factors increase susceptibility:

• Trauma: Blunt neck injury (e.g., motor‑vehicle collision, sports impact, chiropractic manipulation).
• Connective‑tissue disorders: Ehlers‑Danlos syndrome, Marfan syndrome, fibromuscular dysplasia.
• Hypertension.
• Smoking.
• Recent upper‑respiratory infection (possible inflammatory component).
• Genetic predisposition: Family history of arterial dissections.
• Age & gender: Most common in adults 30‑50 years; slight male predominance.

Diagnosis

Prompt recognition is critical. Diagnostic work‑up typically includes:

1. Clinical assessment: Detailed history and neurologic exam.
2. Imaging studies:
   • Computed Tomography Angiography (CTA): Fast, widely available; shows intimal flap, tapered stenosis, or pseudo‑aneurysm.
   • Magnetic Resonance Angiography (MRA) with fat‑suppressed T1‑weighted sequences: Highly sensitive for intramural hematoma.
   • Doppler Ultrasound: Useful for bedside screening but less sensitive for distal lesions.
   • Digital Subtraction Angiography (DSA): Gold standard; reserved for cases where endovascular therapy is considered.
3. Laboratory tests: Rule out hypercoagulable states or inflammatory markers when indicated.

Treatment Options

Treatment aims to prevent stroke, promote arterial healing, and manage symptoms.

Medical Management

• Antithrombotic therapy:
  • Antiplatelet agents (e.g., aspirin 81‑325 mg daily) – commonly used.
  • Or anticoagulation (e.g., warfarin with INR 2‑3 or direct oral anticoagulants) – considered when there is a high risk of embolism or a large intraluminal thrombus.

  Current guidelines suggest either strategy for 3–6 months, followed by reassessment.²

• Blood‑pressure control: Target <140/90 mmHg (or lower if tolerated).
• Pain management: NSAIDs or acetaminophen; avoid high‑dose steroids unless another indication exists.

Endovascular or Surgical Intervention

• Stenting: Reserved for patients with progressive neurological deficits despite optimal medical therapy or for those with a large, expanding pseudo‑aneurysm.
• Surgical repair: Rare; considered when endovascular access is not feasible.

Home & Lifestyle Measures

• Rest and avoidance of activities that strain the neck (heavy lifting, vigorous sports) for the first 2–4 weeks.
• Smoking cessation.
• Adherence to prescribed antithrombotic regimen.
• Regular follow‑up imaging (usually CTA or MRA at 3‑6 months) to document healing.

Prevention

Because many dissections are spontaneous, absolute prevention is not possible, but risk can be reduced:

• Control hypertension, diabetes, and hyperlipidemia.
• Quit smoking and limit alcohol intake.
• Use protective equipment (e.g., helmets) during high‑impact sports.
• Exercise caution with neck manipulation – discuss risks with chiropractors or physical therapists.
• Screen for connective‑tissue disorders if there is a family history of arterial dissections.

Living With Carotid Artery Dissection

Long‑term management focuses on monitoring, lifestyle, and mental health:

• Follow‑up schedule: Neurology or vascular‑medicine visits every 3–6 months initially, then annually if stable.
• Imaging surveillance: Repeat CTA/MRA to confirm resolution; most dissections heal within 6–12 months.
• Medication adherence: Set reminders; keep a medication list.
• Physical activity: After the acute phase, low‑impact aerobic exercise (walking, stationary cycling) is encouraged; avoid contact sports until cleared.
• Psychological support: Stroke‑related anxiety or depression is common; consider counseling or support groups.
• Emergency plan: Carry a medical alert card noting “Carotid Artery Dissection – on antithrombotic therapy.”

When to Seek Emergency Care

Immediate medical attention is required if any of the following occur:

• Sudden weakness, numbness, or paralysis on one side of the body.
• Difficulty speaking or understanding speech.
• Sudden vision loss or double vision.
• Severe, worsening neck or head pain.
• New onset of Horner’s syndrome (drooping eyelid, small pupil, lack of sweating on one side of the face).
• Loss of consciousness or seizures.

Call 911 (or your local emergency number) right away—time is brain.