Central Vertigo

Background

Central vertigo is vertigo due to a disease originating from the central nervous system (CNS). In clinical practice, it often includes lesions of cranial nerve VIII as well. Individuals with vertigo experience hallucinations of motion of their surroundings.

Central vertigo may be caused by hemorrhagic or ischemic insults to the cerebellum (see the image below), the vestibular nuclei, and their connections within the brain stem. Other causes include CNS tumors, infection, trauma, and multiple sclerosis.^{[1, 2]}

View Image

CT scan of a patient with an acute spontaneous cerebellar hemorrhage. The hemorrhage in the right lobe of the cerebellum is partly obscured by bony ar....

Vertigo due to acoustic neuroma is also included in the broader category of central vertigo. An acoustic neuroma develops within the eighth cranial nerve, usually within the course of the internal auditory canal, yet it often expands into the posterior fossa with secondary effects on other cranial nerves and the brain stem.

See Vertigo: 5 Case-Based Diagnostic Puzzles, a Critical Images slideshow, to help recognize diagnostic clues in vertigo cases.

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Pathophysiology

The brainstem, cerebellum, and peripheral labyrinths are all supplied by the vertebrobasilar arterial system. Thus, the central and peripheral ischemic vertigo syndromes overlap.

Vertebrobasilar arterial system

The basilar artery is formed from the 2 vertebral arteries within the cranium at the level of the medulla. The artery has 3 branches on each side that supply the cerebellum. The posterior inferior cerebellar artery branches from the vertebral artery, while the anterior inferior cerebellar artery and the superior cerebellar artery branch from the basilar artery.

All 3 of the cerebellar arteries may have branches that supply brainstem tissue. A labyrinthine artery on each side branches from the basilar artery and supplies the labyrinth and associated structures via the internal auditory canal. In approximately two thirds of people, the basilar artery ends by bifurcating into the posterior cerebral arteries, with small posterior communicating arteries connecting to the internal carotid system in the circle of Willis.

Arterial occlusion and ischemic infarction

Arterial occlusion and ischemic infarction can result from cardioembolism, embolism of plaque from a vertebral artery, or local arterial thrombosis. One or both vertebral arteries, the basilar artery, or any of the smaller branches may be occluded. Even complete occlusion of a large artery may not result in death because of anastomotic retrograde flow via the circle of Willis and posterior communicating arteries.

Temporary vertebrobasilar ischemia may present as migraine syndrome or transient ischemic attacks (TIAs). While less common than cerebellar infarction, spontaneous cerebellar hemorrhage is an important life-threatening cause of vertigo associated with hypertensive vascular disease and anticoagulation.^[3]

Multiple sclerosis

Multiple sclerosis is a demyelinating disease of the CNS. The course generally waxes and wanes, with varying neurologic symptoms and signs. Isolated vertigo may be the initial symptom in approximately 5% of cases. This disease is discussed in detail in the relevant article (see Multiple Sclerosis).

Acoustic neuromas

Acoustic neuromas are Schwann cell tumors that usually originate on the vestibular division of the eighth cranial nerve in the proximal internal auditory canal.^[4] Usually unilateral in development, bilateral acoustic neuromas do occur in young adults, although rarely, in association with neurofibromatosis type 2. If untreated, an acoustic neuroma may expand into the cerebellopontine angle and compress facial and other cranial nerves.^[5] If it compresses the brainstem, ataxia, gait disturbances, spasticity, and weakness from long-tract effects may result. See the image below.

View Image

CT scan of a patient with a large acoustic neuroma on the right side of the brainstem. The scan was performed after injection of intravenous contrast,....

Other causes

Isolated vertigo due to CNS infection, such as a microabscess, or temporal lobe seizures is rare and is not discussed in this article. Vertigo and dizziness are common complications of head and neck trauma. Traumatic central vertigo may be caused by petechial hemorrhages in the vestibular nuclei of the brainstem. These may result from shearing forces on the brainstem.^[6]

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Epidemiology

Frequency

United States

Approximately 500,000 people have strokes each year. About 85% of these strokes are ischemic, and 1.5% of ischemic strokes affect primarily the cerebellum. Ratio of ischemic to hemorrhagic cerebellar strokes is 3-5:1.^[7] Up to 10% of patients with an isolated cerebellar infarction present with only isolated vertigo and imbalance.^[8] Incidence of multiple sclerosis ranges from 10-80/100,000 per year, depending on the latitude. About 3000 cases of acoustic neuroma are diagnosed each year in the United States.

Mortality/Morbidity

Vascular injuries and infarcts in the posterior circulation can cause severe permanent debilitating disease. The excellent recovery typical of acute vertigo caused by peripheral disease should not necessarily be expected in central vertigo.

• A study of the rate and predictors of CNS disease in emergency department patients with dizziness, vertigo, or imbalance found that most cases were benign, although a substantial fraction of patients had serious neurologic disease. Of 907 patients experiencing dizziness (mean age, 59 years; 58% women [n=529]), 49 (5%) had a serious neurologic diagnosis, including 37 cerebrovascular events. Dizziness was often caused by benign conditions, such as peripheral vertigo (294 patients [32%]) or orthostatic hypotension (121 patients [13%]).^[9]
• In one series, cerebellar infarctions had mortality rates of 7% and 17% when associated with the superior cerebellar artery and posterior inferior cerebellar artery distributions, respectively.^[10] Infarctions in the latter distribution are associated more commonly with a mass effect and compression of the brain stem and the fourth ventricle. In another series of patients with cerebellar infarction and mass effect, mortality rate was 17% despite aggressive neurosurgical and medical management.^[11]
• In one series of 94 patients with cerebellar hemorrhage, 20 presented with a Glasgow Coma Scale (GCS; see the Glasgow Coma Scale calculator) score less than 8, indicating significantly impaired consciousness. Mortality rate in the remaining patients who presented with GCS score higher than 8 was 20%.^[3]
• Acoustic neuroma has a low rate of mortality once diagnosed. The tumor often may be removed with preservation of facial nerve function, but unilateral hearing loss is common.

Sex

Incidence of cerebrovascular disease is slightly higher in men than in women. In one series of patients with cerebellar infarction, the ratio of men to women was about 2:1. Multiple sclerosis is about twice as common in women as in men.

Age

Incidence of stroke increases with age. The mean age of patients with cerebellar infarction in one series was 65 years, with half of the cases occurring in those aged 60-80 years.^[7] In one series, the mean age of patients with cerebellar hematoma was 70 years.^[3]

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History

The clinician first should ascertain the nature of the patient's vertigo or dizziness. Patients who have conditions known to cause central vertigo do not always complain strictly of vertigo.

Vertigo implies an abnormal sensation of movement or rotation of the patient or his or her environment. Some patients with central disease may complain of disequilibrium, imbalance, or difficulty maintaining an upright posture. Other important historical factors include the presence of associated symptoms and their nature; the onset, duration, and positional dependence of symptoms; and medical history.

If associated symptoms are present, they may suggest the nature of the underlying disease.

The Dix-Hallpike test can help distinguish central vertigo from peripheral vertigo. During the test, the clinician rotates the patient's head 45 degrees to one side and then helps the patient to quickly lie back down. If rotational nystagmus is observed, the test is considered positive for benign positional vertigo. If the test is negative, CNS dysfunction may be indicated.^[12]

Peripheral vertigo presents with the following:

• Associated nausea
• Vomiting
• Auditory complaints
• Abrupt onset

Central vertigo often produces other neurologic symptoms, although this generalization has many exceptions. The symptoms are characterized as follows:

• Gradual onset
• Tend to be much less intense than those associated with peripheral vertigo

In assessing the possibility of central vertigo related to cerebrovascular disease, inquire about important risk factors. The following are associated with an increased incidence of cerebrovascular accident (CVA):

• Hypertension
• Atrial fibrillation
• History of prior CVA
• Advanced age

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Physical

A thorough neurologic and cardiologic examination is important to identify patients with central vertigo.

• Depressed consciousness

  • Evidence of depressed consciousness requires immediate clinical attention.
  • Depressed consciousness may be due to disease such as infarction within the brain stem or external compression.
  • In patients with cerebellar infarction, brainstem compression is found more often in those who have involvement of the posterior inferior cerebellar artery.
  • In one series, the earliest sign of brainstem compression was lethargy, which occurred in 11% of patients a mean of 50 hours after onset of cerebellar infarct.^[10] Of patients with cerebellar hemorrhage, 46% had deterioration of their mental status an average of 5.5 hours after presentation.^[3]

   

  

   
• Nystagmus

  • Examination of extraocular movements is critical. Nystagmus, if present, may be an important diagnostic clue.
  • Nystagmus consists of slow eye movement in one direction followed by rapid recovery movement in the opposite direction.
  • Vertigo of peripheral origin generally manifests by horizontal, rotatory, or absent nystagmus, but horizontal nystagmus is not a specific sign of peripheral vertigo. It is the most common type of nystagmus observed in patients with cerebellar infarction.^[10]
  • Vertical nystagmus is considered specific for central vertigo.
  • Nystagmus of central origin characteristically is worsened by fixation of gaze, while peripheral nystagmus may be ameliorated.
  • Central nystagmus may be unidirectional or multidirectional and may change direction with an alteration in the direction of gaze (ie, gaze evoked), while peripheral nystagmus is unidirectional.

   

  

   
• Eliciting nystagmus and symptoms of vertigo

  • Hallpike (Nylen-Bárány) maneuver consists of having the patient lie back in bed from a sitting position 3 times in succession.
    • First, the positional change is performed with the patient gazing straight ahead.
    • It is then repeated with the head turned 45° to the right and then 45° to the left.
    • The neck preferably is extended slightly when the patient lies back in the supine position.
    • In contrast to that due to central vertigo, nystagmus due to peripheral disease may not develop immediately after the positional change, and, once it develops, may fatigue quickly and last less than 1 minute.
  • Drachman dizziness battery^[13]
    • BP supine and standing
    • Valsalva maneuver
    • Head turn standing with eyes open
    • Sudden turn when walking
    • Three-minute hyperventilation
    • Nylen-Bárány testing
  • The head impulse test is a test for normal ocular fixation in association with rapid passive head rotation. An abnormal response is indicated by an inability to maintain fixation during head rotation with a corrective gaze shift after the head stops moving. An abnormal test seems to be sensitive, but not specific, for a peripheral vestibular disorder.^[14]

   

  

   
• Internuclear ophthalmoplegia

  • Internuclear ophthalmoplegia manifests as partial or absent movement of the adducting eye and coarse nystagmus of the abducting eye with attempted lateral gaze.
  • It suggests derangement of the medial longitudinal fasciculus and a diagnosis of multiple sclerosis or other brainstem disease.

   

  

   
• Cranial nerve deficits

  • Aside from a disturbance in hearing, other neurologic deficits would not be expected in patients with vertigo of peripheral origin.
  • Associated cranial nerve deficits, including facial weakness, absent corneal reflex, lateral gaze palsy, or dysarthria, mandate further evaluation.

   

  

   
• Neurologic examination of the extremities and coordination is important.

  • Long-tract findings such as weakness, hyperesthesia, or positive Babinski sign are ominous and mandate further workup.
  • Ataxia may be the most important indicator of cerebellar disease. Ataxia of the limbs, as evidenced by the finger-to-nose and heel-shin tests, and truncal ataxia, with difficulty walking or even sitting, are salient findings.

   

  

   
• Cardiac examination

  • Careful cardiac examination may reveal the likely source of an embolic stroke.
  • Check for murmur or irregularly irregular rhythm suggesting atrial fibrillation.
  • Inappropriate bradycardia may suggest an ongoing stroke.

   

  

   

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Causes

See the list below:

• Positional vertigo: abrupt onset of vertigo associated with a change in position suggests benign positional vertigo, a form of peripheral vertigo.
• Cranial nerve deficits

  • Symptoms related to derangement of cranial nerves other than the eighth nerve suggest involvement of the brainstem and/or cerebellum.
  • As the cerebellar arteries supply areas of the dorsal brain stem, cerebellar infarcts also may involve the trigeminal, facial, and other cranial nerve nuclei. Mass effect due to edema, acute hemorrhage, or an acoustic neuroma also can cause cranial nerve deficits.
  • Facial nerve dysfunction, most commonly manifested as weakness or twitching in the periorbital area, is seen in 10% of patients with acoustic neuroma.^[5]
  • Crossed findings (ie, when the patient has signs on one side of the face and sensory and [less commonly] motor signs on the other side of the body) clearly suggest brainstem involvement.
    • This includes the classic lateral medullary infarction (Wallenberg syndrome) consisting of ipsilateral limb ataxia, Horner syndrome, palatal weakness, facial hypesthesia to pain and temperature, and contralateral hypesthesia to pain and temperature in the limbs and trunk.
    • Crossed findings result from unilateral lesions of the brainstem involving cranial nerve nuclei and long tracts from higher brain centers that have yet to cross to the other side of the CNS.

   

  

   
• TIAs: Recurrent transient symptoms lasting a few minutes suggest TIAs.
• Acute cerebellar disease

  • Loss of balance and difficulty maintaining posture, standing, and walking suggest cerebellar disease. These symptoms occur in 50-75% of patients with cerebellar infarction or hemorrhage.^[3]
  • Occipital headache and difficulty with speech are also common complaints with acute cerebellar disease.

   

  

   
• Caudal cerebellar infarction: A prospective study of 24 patients aged 50-75 years with isolated vertigo lasting longer than 48 hours found that 6 (25%) of the patients had a caudal cerebellar infarction.^[15] Infarcts of the medial branch of the posterior inferior cerebellar artery territory appear to be the most common cerebellar cause of isolated vertigo and imbalance.
• Cerebrovascular disease: A recent history of drop attacks, cranial nerve deficits, or transient vertigo should raise suspicion for cerebrovascular disease of the posterior circulation.

  • Basilar artery occlusion: In one study of basilar artery occlusion, 4 of 53 (8%) patients had prodromal symptoms consisting only of vertigo and nausea.^[16]
  • Vertebral artery occlusion: Thirty-seven of 85 (44%) patients who presented with either basilar or bilateral distal vertebral artery occlusion had prodromal symptoms that cleared in the 2 months prior to admission.^[16]

   

  

   
• Cardiovascular risk factors

  • The risk of stroke in patients with atrial fibrillation is highest in the first year after onset in patients not receiving anticoagulation.
  • Diabetes mellitus, hyperlipidemia, and cigarette smoking are also important risk factors.

   

  

   
• Ménière disease and acoustic neuroma

  • Chronic high- and low-frequency hearing loss with associated tinnitus, which fluctuates over time, suggests Ménière disease.
  • Associated auditory symptoms suggest that vertigo has a peripheral origin, though exceptions exist.
  • Hearing loss, often with associated tinnitus, is the most common early symptom of acoustic neuroma.^{[5, 17]}

   

  

   
• Multiple sclerosis: In younger patients, recent history of neurologic deficits, particularly weakness and/or numbness in one or more limbs (lesions in time and space) or unilateral visual loss, should raise suspicion for multiple sclerosis.

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Laboratory Studies

See the list below:

• Laboratory studies may be useful for patients who do not complain strictly of vertigo.
• Rule out anemia, pregnancy, and derangement of serum glucose or electrolytes, if relevant, in patients who complain of lightheadedness or disequilibrium.

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Imaging Studies

See the list below:

• Imaging of the posterior fossa is necessary if the clinician suspects a central lesion.

  • Magnetic resonance imaging (MRI) is the preferred modality to detect infarction,^[18] hemorrhage, tumor,^[5] and the white matter lesions of multiple sclerosis.
  • If MRI is unavailable, computed tomography (CT) scan with fine cuts through the posterior fossa may be used. Unfortunately, CT scan is limited by poorer resolution than MRI and bony artifact.
  • Intra-arterial angiography is used traditionally to diagnose occlusions in the vertebrobasilar system. CT angiography (CTA), noninvasive magnetic resonance angiography (MRA), and Doppler ultrasonography are steadily supplanting it. This may be particularly important as early thrombolysis becomes more established as a therapy.
  • See the images below.

    View Image

    CT scan of a patient with an acute spontaneous cerebellar hemorrhage. The hemorrhage in the right lobe of the cerebellum is partly obscured by bony ar....

    View Image

    MRI of a patient with an acute cerebellar hemorrhage less than 24 hours after presentation. MRI allows better resolution than CT scan without bony art....

   

  

   

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Other Tests

See the list below:

• Electrocardiography (ECG) is necessary to assess for atrial fibrillation, other dysrhythmias, or evidence of acute myocardial infarction (AMI).
• AMI, particularly involving the anterior wall of the left ventricle, can lead to a stiffened ventricle with poor wall movement and secondary stasis. This may serve as a cardioembolic source for cerebral thromboembolism.
• The consulting neurologist may perform caloric testing and electronystagmography (ENG) to help localize the lesion in the vestibular apparatus or vestibular nerve nuclei; audiometry and brainstem auditory evoked potentials (BAER) also may be performed.

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Emergency Department Care

First, distinguish true vertigo from disequilibrium and other forms of dizziness. Ascertaining this history from patients sometimes requires patience and persistence. Once the presence of vertigo or disequilibrium has been confirmed, consider a central cause. Evaluate on the basis of a careful history and physical examination and liberal use of imaging studies of the posterior fossa.

• Therapy usually targets the etiology of the symptoms. However, a variety of medications may be used to reduce symptoms of central vertigo, including antihistamines and benzodiazepines.
• Regardless of the vertigo's etiology, attempt to alleviate the patient's suffering.

  • Place intravenous lines to rehydrate patients.
  • Allow patients to lie still in bed as desired.
  • Administer parenteral medicines for symptomatic relief.

   

  

   
• If clinical and radiologic evaluation suggest an acute ischemic stroke, consider thrombolytic therapy after thorough evaluation and consultation.

  • Thrombolytic therapy is administered with an intra-arterial catheter close to the clot^[19] , or intravenously, if within 3 hours of the onset of symptoms and no other contraindications exist.^[20]
  • Prior to using thrombolytic therapy, consider several issues, especially the risk of intracerebral bleeding. Emergency physicians should be familiar with contraindications such as major surgery within the previous 10 days, severe hypertension, evidence of acute bleed or edema on CT scan, and rapidly improving symptoms.
  • The decision to administer thrombolytic therapy preferably is made with direct neurologic consultation and only after the patient has received a thorough explanation of the procedure and given informed consent. This therapy is discussed further in other articles (see Stroke, Ischemic and Thrombolytic Therapy).

   

  

   
• Lethargic patients or those with altered level of consciousness require vigilance and close supervision, including direct visual, ECG, and pulse oximetry monitoring.
• Do not administer anticoagulant medicine, including aspirin, until intracranial hemorrhage has been ruled out by imaging.
• Imaging studies should be performed expeditiously, and the patient never should be left unattended by clinical personnel in the imaging suite.
• Patients with altered consciousness and a deteriorating course in the ED may require emergent interventions to minimize edema and brainstem compression.

  • As the posterior fossa is a relatively small and nonexpandable space, hemorrhage or edema can lead to rapid compression and compromise of vital medullary functions, obstructive hydrocephalus, or herniation of the medullary tonsils.
  • Invasive actions may include endotracheal intubation to protect the airway, control breathing, and allow therapeutic hyperventilation.
  • Consider elevating the head of the bed, performing diuresis with mannitol or furosemide, and administering dexamethasone.

   

  

   
• Preliminary evidence suggests that recombinant activated factor VII may be useful for acute hemorrhagic stroke when administered within 4 hours of symptom onset.^[21] The data supporting the use of this therapy for hemorrhagic cerebellar stroke is too limited thus far to make a therapeutic recommendation, but further results are expected to clarify its utility and adverse effect profile.

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Consultations

Obtain neurologic consultation for patients with central vertigo, and consider neurosurgical consultation for all patients with space-occupying lesions or hydrocephalus.

The emergency physician should seek immediate neurosurgical consultation for patients with hemorrhage, brainstem compression, or edema, as surgical decompression via suboccipital craniectomy or ventriculostomy may be lifesaving.

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Medication Summary

Patients with depressed mental status may have documented or suspected increased intracranial pressure (ICP). Administer diuretics or corticosteroids to decrease pressure while planning more definitive actions. Administer this therapy preferably in consultation with a neurosurgeon.

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Dimenhydrinate (Dramamine, Dimetabs, Dymenate, Triptone)

• Dosing, Interactions, etc.

Clinical Context:  A 1:1 salt of 8-chlorotheophylline and diphenhydramine, thought to be particularly useful in treatment of peripheral vertigo. Diminishes vestibular stimulation and depresses labyrinthine function through central anticholinergic activity.

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Diphenhydramine (Benadryl, Bydramine, Hyrexin)

• Dosing, Interactions, etc.

Clinical Context:  Used for treatment and prophylaxis of vestibular disorders.

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Promethazine hydrochloride (Phenergan)

• Dosing, Interactions, etc.

Clinical Context:  Used for symptomatic treatment of nausea in vestibular dysfunction.

An antidopaminergic agent effective in treatment of vertigo, blocks postsynaptic mesolimbic dopaminergic receptors in brain and reduces stimuli to brainstem reticular system.

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Class Summary

These agents may suppress vestibular responses through an effect in the CNS; however, the mechanism remains unknown. Some investigators believe this action is mediated primarily by central anticholinergic activity.

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Diazepam (Valium, Diastat, Diazemuls)

• Dosing, Interactions, etc.

Clinical Context:  Probably most commonly used benzodiazepine to treat vertigo. Highly lipophilic and undergoes rapid redistribution after administration. Duration of effects in CNS relatively short, which may make it relatively less desirable.

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Lorazepam (Ativan)

• Dosing, Interactions, etc.

Clinical Context:  Sedative hypnotic in benzodiazepine class that has short time to onset and relatively long half-life.

Depresses all levels of CNS, including limbic and reticular formation, probably through increased action of GABA, a major inhibitory neurotransmitter.

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Class Summary

Centrally, these agents inhibit vestibular responses, presumably by potentiating inhibitory GABA receptors.

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Mannitol (Osmitrol)

• Dosing, Interactions, etc.

Clinical Context:  Nonreabsorbable solute, decreases water reabsorption in water-soluble portions of nephron. Reduces reabsorption of sodium chloride as well. Perhaps more importantly, does not cross blood-brain barrier. Creates osmotic gradient, drawing water from brain into intravascular compartment. Used to lower ICP in variety of conditions.

Initially assess for adequate renal function in adults by administering test dose of 200 mg/kg IV over 3-5 min. Should produce a urine flow of at least 30-50 mL/h over 2-3 h.

In children, assess by administering same test dose and rate. Should produce a urine flow of at least 1 mL/kg/h over 1-3 h.

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Furosemide (Lasix)

• Dosing, Interactions, etc.

Clinical Context:  Loop diuretic that blocks transport of sodium, potassium, and chloride in thick ascending limb of loop of Henle in kidney. May enhance effect of mannitol and produce greater and more sustained decrease in ICP.

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Class Summary

Diuretic agents are used as a temporary measure to lower ICP until definitive intervention is performed.

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Dexamethasone (Decadron)

• Dosing, Interactions, etc.

Clinical Context:  Preferred corticosteroid for this purpose because it demonstrates high glucocorticoid potency and minimal mineralocorticoid activity.

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Class Summary

These agents are used to decrease brain edema associated with intracranial tumors.

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Further Inpatient Care

See the list below:

• Most patients with proven or suspected central vertigo should be admitted to the hospital for further evaluation and treatment.
• Patients should be admitted under the care of a neurologist or neurosurgeon.
• Patients with evidence of acute brainstem or cerebellar disease should be admitted to a monitored bed, preferably in an intensive care unit.

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Transfer

See the list below:

• Transfer may be necessary for patients seen in facilities lacking cranial imaging capability or neurosurgical coverage. Transferred patients require monitoring and the availability of definitive airway management during the transport period.

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Deterrence/Prevention

See the list below:

• The clinician should suspect TIAs in patients with recurrent transient symptoms and risk factors for atherosclerotic or cardioembolic disease. Prognostic scores for early risk of stroke after TIA may be helpful in assessing risk.^{[22, 23]}
• A correct diagnosis of TIA followed by appropriate aspirin or anticoagulant therapy may decrease the risk of a future CVA significantly.

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Prognosis

See the list below:

• Prognosis for patients with central vertigo depends on the underlying disease and is highly variable.
• Neurosurgical advancements have improved the prognosis for many serious conditions. This magnifies the importance of identifying these patients in the emergency setting.
• The prognosis of infarction of the basilar or vertebral arteries is poor. In one series, 45% of patients presented in coma. Importantly, half of the patients in this series had prodromal symptoms, including vertigo, which cleared completely in the 6 months prior to the stroke.^[16]
• The prognosis for patients with spontaneous cerebellar hemorrhage is poor. Neurologic deterioration in these patients is associated independently with a hematoma in the central vermian area of the cerebellum and with secondary hydrocephalus.^[3]

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Patient Education

See the list below:

• Most causes of central vertigo have serious ramifications. Inform the patient of the suspected diagnosis in understandable terms and explain the necessity of hospital admission.
• For patient education resources, see the Brain and Nervous System Center. Also, see the patient education article Vertigo.

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