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VEPs 2

Visual evoked potentials 2

QuestionAnswer
The typical distance from the light source to the patient in flashing VEPs is __ - __ cm 30, 45
Background luminance with flashing VEPs is kept __ (low / high) low
A stimulus luminance for flashing VEPs increases, the amplitude of the VEP __ (increases/decreases) and latency __ (increases/decreases) increases, decreases
Flashing VEPs are set at a frequency of no faster than __ per secon 2
The first channel for a flashing VEP MO-ear
The second channel for a flashing VEP LO-er
The third channel for a flashing VEP RO-ear
A rhythmic after discharge is seen with flashing VEP after approximately __ msec 240
Early peaks with a flash VEP are maximal over the __ cortex; later peaks are maximal near the __ occipital; vertex
Up to __% of normal subjects have no response on one side of the head with flash VEPs despite the absence of pathology 5
The flash VEP can be composed of up to __ peaks with varying polarity, amplitude and latency 7
The normal flash VEP is composed of a major positive peak with a latency between __ and __ msex and a major negative peak with a latency between __ and __ msec 50, 100, 100, 250
After __ weeks conceptual age, an occipitally negative negative peak is seen at 200-300 msec on flash VEP 24
At 24 weeks EGA, an occipitally negative peak is seen on flash VEP at __ - __ msec 200, 300
At __ - __ weeks EGA, a positive peak precedes the negative peak on flash VEP with a latency of < 200 msec 32, 35
As pupil size increases, stimulus intensity __ (increases/decreases) increases
The criteria for an abnormal flash VEP Absence of a response with stimulation of one eye
Created by: schmittse