Now we’ll take a look at three
different vestibular disorders.
We’ll take a look first at
Benign paroxysmal positional vertigo.
Then we'll look at vertigo.
And then we’ll finish up with a brief
discussion about Meniere’s disease.
Benign Paroxysmal Positional Vertigo,
First thing for you to understand is that
this is the most common form of vertigo.
Individuals with this form of vertigo
have sudden onset of episodes.
However, this episodes of dizziness
are of short duration.
Certain head positions or
movements will trigger or prompt
a given episode in individuals
that have this disorder.
What causes this condition?
We’ll it all relates to the macula.
Where we have the macula shown in
through here of the utricle or saccule.
And the macula has embedded in it,
And in the case of this condition,
it is the otoconia in the utricle
that get dislodged
and when they become dislodged they migrate
into one of the semi- circular canals
that we see over here
in this smaller image.
So, here’s a semi-circular canal
here for example.
And another one here
and then in our third semi-circular canal
are shown into there.
So, in otoconia they become dislodge and get
into one of those semi- circular canals.
And when they get there they disrupt normal
fluid movement within a semi-circular canal.
And this will send false signals
in the vestibular system
causing this episodes of dizziness.
The second vestibular disorder that
I want you to understand is that vertigo.
And we’ll walk through several of this symptoms
associated with vertigo in this table.
Individuals with vertigo
may complain of spinning sensation.
They may complain that they are tilting
because of the disruption
of the vestibular apparatus,
and the sensing of false signals.
They may feel that they are swaying.
As a result of this,
they may feel very often that
they’re off balanced or unbalanced.
And they tend to pull to one direction because of
this impairment of the vestibular apparatus.
There are several different causes of vertigo.
You can have an inflammation
of vestibular nerve
or inflammation of the vestibular
pathway of vestibular neuritis,
a vascular lesions of the brain stem
or the cerebellum may impair the
vestibular apparatus resulting in vertigo.
Demyelination and once you lose your insulation
you can have cross talk between
nerve fibers leading to fault signals.
Certain drugs and ingestion of too much alcohol
will certainly disrupt the vestibular system.
And acoustic tumors can also
cause this types of symptoms.
The last vestibular disorder
that I want you to understand
is that of that Meniere’s disease.
This table will guide you through the symptoms
that associated with Meniere’s disease
as well as the causes.
Meniere’s disease is characterized by
abrupt recurrent attacks of vertigo.
There’s also an associated hearing loss
with this disorder.
Tinnitus or ringing of the ears
is associated with Meniere’s disease.
Patients may complain of excess ear pressure
or fullness with in their ear
And nausea and vomiting are
associated symptoms as well.
Several different causes
to consider again,
vascular lesions of the
brain stem or cerebellum,
certain drugs and alcohol
and acoustic tumors.
Now this were the same causes
that we walk through
that you saw earlier with vertigo.