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Vertebral Artery Dissection

Overview

A vertebral artery dissection (VAD) occurs when a tear forms in the lining (intima) of one of the vertebral arteries, which run up the back of the neck and supply blood to the brainstem, cerebellum, and posterior part of the cerebral hemispheres. Blood can enter the arterial wall through the tear, creating a false lumen that narrows the true lumen and may lead to clot formation, reduced blood flow, or embolic stroke.

While VAD can happen at any age, it most commonly affects young and middle‑aged adults (30–50 years). It accounts for ≈1–2 % of all ischemic strokes and is the leading cause of stroke in people younger than 45 years (Mayo Clinic; NIH). Both sexes are affected, though some series suggest a slight male predominance (≈55 % male).

The exact prevalence is difficult to determine because many cases are mild or missed, but epidemiologic studies estimate an annual incidence of 1–3 per 100,000 population (Cleveland Clinic; WHO). The condition can be spontaneous or triggered by trauma, even seemingly minor neck movements.

Symptoms

Symptoms arise from reduced blood flow to the posterior brain, irritation of surrounding nerves, or emboli that travel to the brain. The presentation can be abrupt or evolve over hours to days.

Neurologic Symptoms

• Dizziness or vertigo: feeling of spinning or light‑headedness; often the first sign.
• Headache: typically unilateral, located in the posterior head or neck; may be severe and throbbing.
• Neck pain: sharp or aching pain at the base of the skull or along the cervical spine, sometimes worsened by neck movement.
• Ataxia: loss of coordination, especially gait instability.
• Double vision (diplopia) or other visual disturbances: due to brainstem or cerebellar involvement.
• Slurred speech (dysarthria) or difficulty swallowing (dysphagia).
• Weakness or numbness: often affecting one side of the body (hemiparesis/hemianesthesia) if a stroke occurs.
• Horner’s syndrome: drooping eyelid, constricted pupil, and lack of sweating on the affected side of the face (from sympathetic chain irritation).

Other Possible Manifestations

• Transient ischemic attacks (TIA) – brief episodes of neurologic deficits that resolve within 24 hours.
• Auditory symptoms – tinnitus or hearing loss (rare).
• Falls or loss of consciousness – usually when a stroke progresses.

Causes and Risk Factors

Spontaneous (non‑traumatic) Dissections

• Connective‑tissue disorders: e.g., Ehlers‑Danlos syndrome (type IV), Marfan syndrome, and fibromuscular dysplasia weaken arterial walls.
• Genetic predisposition: family history of arterial dissections.
• Hypertension: chronic high pressure can stress the arterial wall.
• Smoking: nicotine damages vascular endothelium.
• Recent infection or inflammation: perivascular inflammation may predispose to intimal tearing.

Traumatic Dissections

• Direct neck trauma – motor‑vehicle accidents, sports injuries, or a sudden hyperextension/rotation of the neck (e.g., tennis serve, chiropractic manipulation).
• Minor mechanisms – coughing, sneezing, or even vigorous turning of the head can precipitate a tear in vulnerable individuals.

Demographic Risk Factors

• Age 30–50 years (peak incidence).
• Male sex (slight predominance).
• Caucasian ethnicity appears slightly over‑represented in epidemiologic series, though data are limited.

Diagnosis

Prompt diagnosis is essential to prevent stroke. The work‑up combines a careful history, physical examination, and targeted imaging.

Clinical Assessment

• Focused neurologic exam to document deficits.
• Neck‑movement assessment – pain reproduced with rotation or extension may raise suspicion.

Imaging Modalities

1. Computed Tomography Angiography (CTA): fast, widely available; shows arterial lumen irregularities, double‑lumen sign, or tapered stenosis.
2. Magnetic Resonance Angiography (MRA) with fat‑suppressed T1‑weighted sequences: detects intramural hematoma (bright on T1), highly sensitive for early dissection.
3. Doppler Ultrasound: useful for proximal vertebral artery (V1 segment) but limited for intracranial portions.
4. Digital Subtraction Angiography (DSA): gold standard; performed when non‑invasive studies are inconclusive or when endovascular therapy is considered.

Laboratory Tests

Routine blood work (CBC, metabolic panel) is usually normal. Screening for hypercoagulable states or connective‑tissue disease may be ordered if clinical suspicion exists.

Treatment Options

Management aims to prevent stroke, promote vessel healing, and control symptoms.

Medical Therapy

• Antithrombotic therapy:
  • Antiplatelet agents (e.g., aspirin 81–325 mg daily) are first‑line for most patients without high‑risk occlusion.
  • Anticoagulation (e.g., low‑molecular‑weight heparin → warfarin targeting INR 2–3) may be chosen when a large intraluminal thrombus is visualized or when the dissection extends into a pseudo‑aneurysm. Recent meta‑analyses (Cochrane 2022) show no clear superiority of anticoagulation over antiplatelet therapy, so choice is individualized.
• Blood‑pressure control: keep systolic < 140 mm Hg; beta‑blockers or ACE inhibitors are commonly used.
• Pain management: NSAIDs or acetaminophen for neck pain; avoid high‑dose steroids unless a specific indication exists.

Endovascular and Surgical Options

• Stent placement: reserved for patients with worsening stenosis, persistent symptoms despite medical therapy, or enlarging pseudo‑aneurysm. Technical success > 90 % in modern series (JAMA Neurology 2023).
• Surgical bypass or vessel ligation: rare, considered only when endovascular treatment fails or is contraindicated.

Lifestyle Modifications

• Smoking cessation.
• Limit activities that force extreme neck rotation or hyperextension for at least 4–6 weeks.
• Control diabetes, cholesterol, and other vascular risk factors.
• Regular low‑impact aerobic exercise once cleared by a physician.

Living with Vertebral Artery Dissection

Follow‑up Schedule

• First imaging (CTA/MRA) at diagnosis, then repeat at 1–3 months to assess healing.
• If stable, imaging at 6 months and 12 months; many dissections remodel spontaneously within a year.
• Neurologic follow‑up every 3–6 months during the first year.

Daily Management Tips

• Neck posture: keep the head neutral; use a supportive pillow; avoid sleeping on a very firm or very soft surface that forces awkward angles.
• Ergonomics: adjust computer monitor height; use a headset instead of a cradled phone.
• Physical activity: start with walking, stationary cycling, or swimming; avoid contact sports, heavy lifting, and activities that involve rapid head turns.
• Medication adherence: use pill organizers or phone reminders.
• Stress reduction: mindfulness, yoga (modified, no deep neck bends), or counseling.
• Vaccinations: stay up to date on influenza and COVID‑19 vaccines; infections can raise inflammatory burden.

Prevention

Because many cases are spontaneous, absolute prevention is impossible, but risk can be lowered.

• Control hypertension: regular BP checks, diet low in sodium, weight management.
• Quit smoking: resources such as nicotine‑replacement therapy, counseling, or quit‑lines.
• Screen for connective‑tissue disorders: if you have a known diagnosis (e.g., Ehlers‑Danlos), engage a vascular specialist for monitoring.
• Safe neck manipulation: discuss with a healthcare professional before chiropractic or osteopathic neck adjustments; request gentle techniques.
• Protective gear: wear helmets in cycling, skiing, or other high‑impact sports.
• Education: inform coaches, trainers, and family members about warning signs of cervical injury.

Complications

If untreated or inadequately managed, VAD can lead to serious sequelae.

• Posterior circulation stroke: the most common complication; can cause permanent disability or death.
• Persistent neurological deficits: ataxia, chronic vestibular dysfunction, or speech problems.
• Pseudo‑aneurysm formation: may enlarge and rupture, though rare.
• Re‑dissection: a second tear in the same or contralateral artery (≈5 % recurrence rate).
• Chronic pain syndrome: neck pain lasting months, sometimes requiring multidisciplinary pain management.

When to Seek Emergency Care

Call 911 or go to the nearest emergency department immediately if you experience any of the following:

• Sudden, severe headache ("worst ever") or neck pain that does not improve.
• Sudden weakness, numbness, or loss of coordination on one side of the body.
• Difficulty speaking, slurred speech, or facial droop.
• Sudden vision changes, double vision, or loss of vision.
• Sudden dizziness, loss of balance, or inability to stand.
• Loss of consciousness or seizure activity.

These signs may indicate an evolving stroke and require rapid evaluation and treatment.

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Sources: Mayo Clinic. Vertebral Artery Dissection. 2023; CDC. Stroke in Young Adults. 2022; NIH National Institute of Neurological Disorders and Stroke. Dissections of the Cervical Arteries. 2021; WHO Global Health Estimates 2022; Cleveland Clinic. Vertebral Artery Dissection – Patient Guide 2024; Cochrane Review. Antithrombotic Therapy for Cervical Artery Dissection. 2022; JAMA Neurology. Endovascular Stenting for Cervical Artery Dissections. 2023.

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