What are the most common causes of vertebral artery dissection?

Most Common Causes of Vertebral Artery Dissection

Vertebral artery dissection most commonly occurs spontaneously or following minor trauma, particularly involving sudden or excessive neck movements such as hyperflexion, hyperextension, or chiropractic manipulation. 1

Primary Etiologic Categories

Traumatic Causes

The V3 segment of the vertebral artery is connected to highly mobile cervical vertebrae, creating mechanical vulnerability that underlies most traumatic dissections 1:

• Minor neck trauma (most common traumatic trigger):

  • Hyperflexion or hyperextension of the neck
  • Chiropractic manipulation (incidence of 1.3 per 100,000 within 1 week of manipulative therapy in patients ≥45 years) 1
  • Coughing and nose blowing 1

• Direct trauma:

  • Penetrating injuries (stab wounds, gunshot wounds) 2
  • Severe cervical spine injuries with subluxation, luxation, or complex fractures (20-40% of severe cervical injuries have associated vertebral artery dissection) 2

Spontaneous Dissections

Many cases occur without obvious precipitating trauma, though the distinction between "spontaneous" and "traumatic" is artificial given the continuum between both forms 3. In one series, 83% of cases were temporally related to trauma, but this still leaves a substantial proportion occurring spontaneously 4.

Underlying Arterial Wall Pathology

While the exact structural defect remains unknown in most cases, several connective tissue disorders predispose to dissection 1:

• Ehlers-Danlos syndrome type IV
• Marfan syndrome
• Autosomal dominant polycystic kidney disease
• Hyperhomocysteinemia
• Osteogenesis imperfecta
• Fibromuscular dysplasia (FMD) - approximately 15% association with carotid dissection 1

Important caveat: Despite these known associations, most patients with vertebral artery dissection have no identifiable connective tissue disease (only 7.9% in one systematic review) 5, suggesting that subtle, unrecognized arterial wall abnormalities are likely present in many cases.

Other Risk Factors

• Amphetamine abuse 1
• Bicuspid aortic valve (though dissection occurs in only 1-5% of patients with this condition) 1

Clinical Recognition Points

The most common presenting symptoms that should raise suspicion for vertebral artery dissection are 5:

• Occipital or neck pain (present in nearly all cases - 100% in one series 4)
• Dizziness/vertigo (58%)
• Headache (51%)

These symptoms typically precede cerebrovascular events, which occur in 63% of cases 5. The key is maintaining high clinical suspicion when these pain syndromes occur after neck manipulation or minor trauma, even when the mechanism seems trivial.