Vertebrobasilar Atherothrombotic Disease Clinical Presentation
- Author: Eddy S Lang, MDCM, CCFP(EM), CSPQ; Chief Editor: Robert E O'Connor, MD, MPH more...
Vertebrobasilar TIAs typically have shorter duration than attacks involving the carotid territory, lasting 8 minutes on average compared with 14 minutes for carotid TIAs.
Classic symptoms of posterior region ischemia include the following :
Visual field defects (diplopia, hemianopia)
Auditory phenomena (sudden sensorineural hearing loss)
Facial numbness or paresthesias
Dysphagia, dysarthria, hoarseness
Syncope (drop attacks)
Hemisensory extremity symptoms (eg, contralateral to facial component)
Vertigo is the hallmark symptom of patients experiencing ischemia in the vertebrobasilar distribution. Many patients describe their vertigo as nonviolent or more of a swimming or swaying sensation. Exact incidence of vertigo is unknown, yet as many as one third of patients with VBI may experience vertigo as the sole manifestation of their illness.
Other symptoms specific to regional infarcts and syndromes include the following:
Lateral medullary infarct (Wallenberg syndrome): When VBI progresses to a complete brainstem infarction, a common syndrome is impaired neurologic functioning in the lateral aspect of the medulla, first described by Wallenberg. This is characterized by the following:
- Ipsilateral facial pain and numbness
- Ipsilateral ataxia (falling to side of lesion)
- Vertigo, nausea, vomiting
- Contralateral pain and thermal impairment over body and occasionally face
Medial medullary infarct: Occlusion of a vertebral artery or branch of the lower basilar artery may produce the following symptoms:
- Contralateral arm and leg weakness (facial sparing)
Basilar artery syndrome: Caused by complete basilar artery occlusion, this is characterized by the following:
- Locked-in state (awake quadriplegia)
- Paralysis or weakness of all extremities
- Horizontal gaze paresis, stupor, coma
Subclavian steal syndrome: This syndrome results from retrograde blood flow down the vertebral artery in response to increased demands from the left upper limb.
- One of the earliest descriptions of VBI was reported in patients who suffered from stenotic lesions of their left subclavian arteries, just proximal to the take-off of the vertebral artery. Half of these patients reported vertigo symptoms consistent with posterior circulation ischemia when exercising their left arms.
- Some series suggest that arm claudication and headache are the most prominent features in patients with symptomatic subclavian steal syndrome.
Labyrinthine artery occlusion: This artery commonly branches from the anterior inferior cerebellar artery. The resulting ear damage may lead to the following symptoms:
- Prolonged vertigo
- Hearing loss
Most patients with early stage VBI have only transient episodes of neurologic dysfunction. As a result, most commonly cited physical symptoms may be minimal or nonexistent. Patients with ongoing symptoms, or those who already have incurred an ischemic deficit, demonstrate physical findings that reflect brainstem and cerebellar dysfunction. Crossed signs (eg, contralateral motor and sensory findings) are hallmarks of many types of brainstem strokes.
- Limb ataxia
- Truncal ataxia (falling to side of lesion)
- Contralateral deficit in pain and temperature perception
- Ipsilateral limb and trunk numbness
- Ipsilateral loss of taste
- Visual field defects
- Ipsilateral hearing loss
Lateral medullary infarct (Wallenberg syndrome)
- Contralateral impairment of pain and thermal sensation to the extremities
- Ipsilateral Horner syndrome (eg, ptosis, miosis, anhydrosis)
Medial medullary syndrome
- Ipsilateral paralysis and atrophy of the tongue
- Contralateral deficit in proprioception and fine touch (facial sparing)
- Internuclear ophthalmoplegia
Basilar artery syndrome
- Bifacial and oropharyngeal palsy
- Horizontal gaze paresis
- Decreased level of consciousness
Subclavian Steal syndrome
- Differences between systolic blood pressure (> 25 mm Hg) or diminished/absent arm pulses
Atherosclerosis is by far the most common cause of VBI, making VBI most common among patients with cardiovascular risk factors such as age, hypertension, diabetes mellitus, smoking, dyslipidemias, and family history of premature coronary artery disease (men < 55 years old, women < 65). VBI may result from any disease process that has an impact on the arterial supply to the posterior fossa, including the following:
Rotational occlusion (Bow hunter's stroke) - Mechanical occlusion or stenosis of the vertebral artery at the C1-C2 level caused by lateral flexion
Vertebral artery dissection
Dolichoectasia of basilar artery
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