Dizziness Flashcards
What is your first step in evaluating a patient who presents with dizziness?
- Differentiate vertigo from presyncope from unsteadiness
- True vertigo should have an aspect of movement (spinning of self or room)
What are some other things that people report as dizziness? (7)
- Presyncope
- Unsteadiness of gait (peripheral neuropathy)
- Blurry or double vision
- Cloudy mentation - disorientation
- Migraine aura
- Seizure aura
- Anxiety
If the patient has vertigo, what other questions should you be asking?
-
Are there associated symptoms?
- Cranial nerves
- Hearing
- Ataxia
- Cardiovascular
- Onset, timing, duration, stimulating activities
- Peripheral vs. Central vertigo
What is the difference between peripheral & central vertigo?
-
Peripheral vertigo
- Delay for stimulation (1-2 sec)
- Exhibits fatigue
-
Central vertigo
- No delay
- Much more profound & prolonged
- Little fatigue
What is the definition of vertigo?
- Imbalance to input from either inner ears, vestibular nuclei or vestibular tracts
- Sensation of movement w/o any
- Misperception of movements one is making
What are the peripheral causes of vertigo?
- BPPV
- Meniere’s
- Vestibular Neuronitis
- Labyrinthitis
- Direct trauma
What are the central causes of vertigo?
- Stroke - lateral medullary, cerebellum
- Brainstem or cerebellar mass
- Medications
- Migraine
- MS
- Anxiety
What parts of the ear detect linear acceleration?
- Maculae in the utricle & saccule
- Linear movement = both ears perceive in the same way
What parts of the ear detect angular motion?
- Semicircular canals detect angular motion, each in its own plane
- X, Y, Z plane
- No otoliths but have gel –> gel moves against the semicircular canal
Identify the labeled structures:
- Lateral Semicircular Canal
- Vestibule
- Internal Auditory Canal
Identify the labeled structures:
- Posterior Semicircular Canal
- Mastoids
What are the 4 vestibular nuclei?
-
Caudal Pons
- Superior vestibular nucleus
- Lateral vestibular nucleus
-
Rostral Medulla
- Medial vestibular nucleus
- Inferior vestibular nucleus
_______, _______, & ________ are places where you get lesions that cause vertigo.
These often disturb the _____________ tracts.
cerebellum, pons, medulla
vestibulospinal
Mrs. Jones is a 67-year-old woman w/ a PMH of smoking & HTN. She takes lisinopril 10 mg daily. She presents to her primary physician complaining of dizziness.
She describes 2 days of having a severe sensation of spinning when she sits up or rolls over, lies down or even when she turns to the left. She has to sit down or hold on & close her eyes to keep from falling or throwing up. It goes away after ~30 sec. She does not have any hearing changes or other neurologic symptoms.
Vitals, mental status, cranial nerves, motor, sensory, all normal. Hearing is normal.
What does Mrs. Jones have?
Benign Paroxysmal Positional Vertigo
What causes BPPV?
How does it usually present?
How is it treated?
- Secondary to a free-floating canalith usually within 1 of the semicircular canals. The canalith creates turbulent flow within the endolymph resulting in the sensation of motion (vertigo).
- Patients with all 4 of the following criteria usually have BPPV
- Recurrent vertigo
- Duration of attack < 1 minute
- Symptoms invariably provoked by changing head position
- Lying down or turning over in bed OR
- 2 of the following: Reclining the head, rising from supine, or bending forward
- Not attributable to another disorder
- Treatment: Epley maneuver
What is the Dix-Hallpike maneuver?
What do you expect to see?
- Drop the patient backwards & then turn the head sideways & down towards the floor
- Ask the patient to look toward the floor & watch for nystagmus
- In peripheral nystagmus you will see it develop after a few seconds & last for under a minute
- Patients can get sick so be careful
- Also may need assistance to do it safely
Fill in the blanks:
In BPPV, where are the otoconia after they are displaced from the utricle?
Posterior canal
What would your patient have if they get dizzy when they stand up?
How is this tested for?
Orthostatic hypotension
- Usually more lightheaded than vertiginous
- Medication
- Hyponatremia/dehydration
- Autonomic failure
- Important to test orthostatics WELL
- Start supine, then sitting, then standing w/ >3 min in each position prior to testing
- >20 mmHg drop in SBP or >10 mmHg drop in DBP after 3 min is diagnostic
- Tilt table testing for autonomic insufficiency
What is the best type of imaging for Vertebrobasilar insufficiency?
How is it treated?
Vascular imaging
- MRI won’t tell you anything
- Take her off anti-hypertensives
- Possible stenosing (but not that effective)
- Don’t lower BP (orthostatis is disastrous)
What is this?
Benign meningioma of the left cerebellum
- Dural tails characteristic of meningioma
- Cause problems by mass effect
- Surgical resection or radiation to shrink
What is this? (younger patient)
Pilocytic astrocytoma
- Motor tracts not affected
- Problems w/ sensation, balance, vertigo, eye movements
What is Lateral Medullary (Wallenberg) Syndrome?
How does it present?
How is it treated?
- Often from vertebral artery dissection (PICA)
- Rare, but more common in young people
- Some or all of:
- Dysphagia
- Horner’s syndrome
- Ataxia
- Sensory loss
- Nystagmus
- Vertigo
- Pain up neck for days after trauma
- Anticoagulation: heals on its own
- Good prognosis
What is this?
Vertebral artery dissection (PICA)
What is this?
Multiple Sclerosis
Multiple plaques perpenticular to ventricles
