42
Supine
These are VNG test to diagnose BPPV and other vestibular complaints. Parameters
are calculatedfor horizontal channelall positions
• Nystagmus Count
• Latency (sec) is calculated from the difference in time between head
displacement and the onset the first Nystagmus
• SPV (º/sec) is average slow phase velocity
Dix Hallpike
These are very important as part of the standard VNG to diagnose BPPV and other
vestibular complaints. Parameters are calculated for horizontal channel both side
(Dix-Hallpike Right and Dix-Hallpike Left)
• NystagmusCount
• Latency (sec) is calculated from the difference in time between head
displacement and the onset the first Nystagmus
• SPV (º/sec) is average slow phase velocity
Calorics
The caloric tests evaluate the viability of the peripheral end organs by stimulating
them with warm and cool water or air. The resulting dizziness and Nystagmus is taken
as an index of the viability of the organ. The culmination phase area is automatically
defined (the best 30 sec). Nystagmus that lie outside the area, does not contribute to
the analysis.
• Time /SPV: show the slow-phase velocity evolution of the tests performed.
Tobeableto appreciate the test symmetry, it is possible to generate an
interpolating line that automatically fits.
• Fray’s graph:show the frequency (Hz) and slow-phase velocity (º/s) as well as
absolute anddirectional preponderance data, right and left Nystagmus beats,
symmetry, frequency and slow phase velocity for each ear. (See: APENDIX
Freyss Graph)
• Parameters: show the absolute and directional preponderance data, right and
left Nystagmus beats, symmetry, frequency and slow phase velocity for each
ear.
Unilateralweakness=
(R
E
44
+
R
E
30)
-
(
LE44
+
L
E
30
)x
100.
(R
E
44
+
RE30
+
L
E
44
+
L
E
30
)
ABSPrep
=(R
E
44*
L
E
30
-
R
E
30*
L
E
44
) (R
E
44
+
RE30
+
L
E
44
+
L
E
I
30
)
Dir
Preponderances
= (R
E
44
+
L
E
30)
-
(
LE44
+
RE30)x100.
(RE44
+
R
E
30
+
L
E
44
+
L
E
30
)
RightBeat
=
R
E
44
+
L
E
30
L
e
f
t
Beat
=
R
E
30
+
L
E
44
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