Tutorial #31: Dizziness

Question 1

Describe the sensation of “Vertigo”

Answer 1

“The room is spinning”

Question 2

Describe the senation of “Near Syncope”

Answer 2

“Feeling like you’re about to faint”

Question 3

Describe the sensation of Disequilibrium (x3)

Answer 3

“Position of your body parts is not precisely known”

“Sensation of falling”

“difficulty walking or standing”

Question 4

With the HINTS exam, what 3 physical exam results are consistent with a PERIPHERAL cause of vertigo?

Answer 4

1. Head impulse test -> the PRESENCE of refixation saccade
2. Nystagmus -> unidirectional, horizontal
3. Skew deviation -> absent

Therefore, if the patient does not have a refixation saccade OR has vertical / direction changing nystagmus OR has skew deviation, then it is a central cause of vertigo (You only need one of the three)

Question 5

What 3 kinds of nystagmus suggest a central cause of vertigo?

Answer 5

1. bidirectional nystagmus
2. Nystagmus that is not inhibited by visual fixation on an object
3. Nystagmus that lasts > 1 min OR fails to fatigue with repitition

Question 6

In assessing vertigo, what are the first 3 steps you should take

Answer 6

Step 1: determine if vertigo is CNS in origin

Step 2: determine timing of vertigo episodes

Step 3: determine if it is triggered by head movement, or made worse by head movement

1. CNS: new severe headache, neck pain. Brainstem dysfunction, cerebellar dysfunction, abnormal nystagmus, etc.
2. if < 1 min, most likely BPPV, if lasting minutes to hours, might be TIA, vestibular migraine, meniere disease, etc. If Symptoms last for days, consider vestibular neuritis, stroke, or other CNS causes.
3. Vertigo triggered by motion, most likely BPPV.

TIP: for vertigo that is persistent, you can use HINTS exam to determine if central or peripheral.

Question 7

What is the most common cause of peripheral vertigo?

Answer 7

Benign paroxysmal positional vertigo (BPPV)

Question 8

What is the confirmatory test for BPPV?

Answer 8

Dix-Hallpike test

Question 9

What is the classical presentation of BPPV?

Answer 9

sudden abrupt onset of severe dizziness that occurs when changing head position, and lasts for < 1 min.

NOTE: Just because someone turns their head and their vertigo is worse, it does not mean its BPPV. Almost all causes of vertigo, whether peripheral or central, will worsen with head movement. BPPV is different because it is short, episodic, and triggered by head movement. It is confirmed with bedisde testing, such as the Dix-Hallpike, or other provocative maneuvers

Question 10

What is the treatment for BPPV?

Answer 10

The Epley Maneuver

Question 11

What is the classic presentation of acute vestibular neuritis?

Answer 11

can be precipitated by viral infection

Should not have any other focal neuro deficits

persistent vertigo that worsens with head movement, that can cause nausea/vomiting, and gait instability.

A HINTS exam would be helpful here to differentiate from a central cause.

Question 12

What is the etiology of acute vestibular neuritis?

Answer 12

Inflammation of the vestibular-cochlear nerve

Question 13

What is the treatment of acute vestibular neuritis?

Answer 13

Self-resolves, symptom management.

include antihistamines, and antiemetics

Question 14

What are positive predictors of vertigo due to cerebrovascular disease (ie. Central cause of vertigo) (x5)

Answer 14

1. Severe gait impairment
2. cerebellar abnormalities on exam
3. Positive HINTS test
4. Facial droop
5. motor function abnormalities (spasticity/weakness/etc)

Consider also if the patient has cardiovascular risk factors (HTN, T2DM, Smoking history, DLD)

Question 15

Central vertigo caused by cerebrovascular disease is often due to inadequate perfusion to what area in the brain?

Answer 15

Inadquate perfusion to the posterior sections of the brain (ie. cerebellum)

Question 16

What is ill-defined dizziness?

Answer 16

Dizziness that does not fit into any other subtypes (ie. not vertigo, dysequilibrium, or fainting)

Usually a diagnosis of exclusion, the dizziness is often of long duration and poorly defined. Patient may complain of other associated symptoms particularly if they have panic attacks (20-38% of patients experience these two things together)