Armando Hasudungan
Biology and Medicine videos

Dizziness and vertigo

Overview Dizziness is a broad term used by patient to describe a range of sensations that include vertigo, presyncope, imbalance sensation and light-headedness. Vertigo describes a spinning sensation but sometimes a sensation of falling or pitching. Presyncope is a result of decrease global perfusion to the brain resulting in near fainting sensation (syncope is a […]

Overview Dizziness is a broad term used by patient to describe a range of sensations that include vertigo, presyncope, imbalance sensation and light-headedness. Vertigo describes a spinning sensation but sometimes a sensation of falling or pitching. Presyncope is a result of decrease global perfusion to the brain resulting in near fainting sensation (syncope is a transient loss of consciousness due to decrease perfusion to brain). Sensation of imbalance describes dysequilibrium and is usually of a central cause such as the brain and brain stem. Patients and with mental health can also describe a sensation of light-headedness often as a result hyperventilation or emotion stress.

Remember Vertigo is not only caused by pathology in the vestibular system but can also be caused by cerebellar and neurodegenerative disorders

 

Categories of dizziness Pathophysiology Aetiology
Vertigo
(Spinning sensation)
Vestribular pathology Vestibular neuritis
Labyrinthitis
Meniere’s disease
Presyncope
(fainting sensation)
Reduced cerebral perfusion Neurocardiogenic syncope
Situational syncope
Carotid sensitivity
Postural hypotension
Dysequilibrium
(imbalance sensation)
Gait disorder Myelopathy
Peripheral neuropathy
Parkinson’s disease
Light-headedness
(sensation of disconnection from the environment)
Psychological disorder Anxiety
Depression

Vertigo

Vertigo is sensation of false movement, generally described as rotation or spinning sensation.  It is caused by asymmetry of neural activity between the right and left vestibular nuclei located in the brainstem. Bilateral damage does not cause vertigo. Essential to determine if the vertigo is central or peripheral since cerebellar infarction/haemorrhage can present as vertigo and can be life-threatening.

Remember Vertigo describes a spinning sensation but sometimes a sensation of falling or pitching. Presyncope is a result of decrease global perfusion to the brain resulting in near fainting sensation

Peripheral causes of vertigo (suggest inner ear pathology)

  • Benign paroxysmal positional vertigo
  • Vestibular neuritis
  • Meniere’s disease
  • Otosclerosis
  • Cholesteatoma
  • Perilymph fistula
  • Aminoglycoside ototoxicity

Central causes of vertigo

  • Vestibular migraine
  • Multiple sclerosis
  • Tumour
  • Cerebellar Stroke – especially involving the vertebrobasilar artery
Peripheral features Central features
 Vertigo improves with visual fixation Vertigo does not improve with visual fixation
Hearing loss Ataxia
Tinnitus Visual field loss
Aural fullness Diplopia
Positive impulse test Limb weakness
Unidirectional horizontal nystagmus Dysarthria
Dysphagia
Nystagmus all directions (especially vertical nystagmus and horizontal nystagmus that changes direction with gaze)

Differential Diagnosis of acute vertigo

  • Acute vestibular neuritis
  • Labyrinth infarction
  • Perilymph fistula
  • Brainstem and cerebellar infarction

Differential Diagnosis of recurrent acute vertigo

  • Benign paroxysmal positional vertigo
  • Meniere disease
  • Migraine
  • Vestibular schwannoma (slowly progressive)

Approach

History

  • Unilateral or bilateral
  • Acute or chronic or progressive
  • Spontaneous vertigo (present when head is stationary) or motion induced vertigo
    • Head movement likely BPPV
    • Standing up likely orthostatic hypotension → dizziness
  • Signs and symptoms of stroke (dysarthria, limb weakness, blurry vision) – central cause
  • Associated Otological symptoms
    • Hearing loss, aural pressure with tinnitus likely Meniere’s Disease
    • Hearing loss, nausea and vomiting +/- tinnitus likely labyrinthitis or vestibular neuritis
    • Hearing loss can also be associated with viral infection and ototoxic medications
    • Hearing loss and otitis media can be associated with granulomatosis with polyangiitis
Seconds Minutes-Hours Days
Benign paroxysmal positional vertigo Meniere’s Disease Brainstem or cerebellar infarction
Perilymph fistula (trauma) Vestibular migraine Labyrinthitis
TIA Multiple sclerosis
Vestibular neuritis
  • Preceding history
    • History of viral infection likely labyrinthitis or vestibular neuritis
    • History of travelling prior to onset of symptoms associated with mal de debarquement syndrome
    • History of trauma likely perilymph fistula
  • Other associated signs and symptoms
  • Past medical history
    • History of migraines may have vestibular migraine
    • Cancer history with dizziness, nausea and vomiting, ataxia, dysarthria, dysphagia and nystagmus can indicate paraneoplastic cerebellar degeneration
  • Medications
    • Aminoglycosides  leading to ototoxicity
    • Antihypertensive agents can cause presyncope → dizziness
    • Alcohol intoxication
  • Family History
    • Migraines
    • Friedreich’s ataxia
  • Risk factors for cardiovascular disease → cerebellar stroke

Examination – check cerebellar signs too

  • Titubation – slow frequency bobbing of head and tunk
  • Gait – ?ataxia
  • Eye movements
    • Nystagmus
    • Pursuit – ability to follow a smoothly moving target
    • Saccades – ability to look back and forth accurately between two targets
  • Ear examination
  • Fistula test
  • Cranial nerve examination
  • Upper and lower neurological examination
  • Head impulse test (to differentiate vestibular neuritis and cerebellar stroke)
  • Dix-Hallpike maneuver (testing for BPPV)
  • Cardiovascular examination
Remember Poor pursuit or inaccurate saccades usually indicate central pathology

Investigation

  • ECG
  • CT scan
  • MRI scan
Remember all patients suspected of central cause should get a CT and better MRI scan

Management

  • Physical therapy
    • Repositioning maneuvers
    • Vestibular rehabilitation
  • Low sodium diet
  • Antihistamines
  • Benzodiazepines
  • Anticholinergic
  • SSRI

 

 

 

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