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Principles 3, test 2, neuro lecture slides 68-82
i hear some cougars are man-eaters
15
Nursing
Graduate
02/22/2010

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Term
SSEPs are monitored by placing stimulators bilaterally on the _________, then redorded at the ________.
Definition
ulnar, median, or tibial nerves, and recorded at the scalp
Term
Surgery at the base of the brain should be monitored with what type of evoked potential?
Definition
VEPs
Term
Surgery at the brainstem should be monitored whith what type of evoked potential?
Definition
BAEPs
Term
What are some physiological factors that can alter the latency and amplitude of SEPs?
Definition
temp (hyper or hypo), SBP (hypotension), PaCO2 (and subsequent changes in cerebral blood flow), PaO2 (and subsequent ischemia)
Term
What effects do volatiles have on the EEG waveform?
Definition
decrease amplitude and increase latency
Term
How sensitive to the volatile is visual evoked potentials? brain auditory? somatosensory?
Definition
very, barely, somewhat
Term
Do motor evoked potential monitor acending or decending pathways? where does the stimulation/sensing occur?
Definition
decending pathways in the anterior spinal cord. stimulation occurs at the motor cortex or c-spine and sensing occurs at peripheral nerves/muscles
Term
If i know that I am going to use motor evoked potentials, what class of drugs should I discuss with surgeon/monitoring tech prior to using?
Definition
muscle relaxant
Term
What monitor estimates the balance between cerebral O2 supply and demand?
Definition
jugular bulb venous oximetry
Term
what is a normal level of jugular venous O2 saturation?
Definition
60-70%
Term
A ventric drain is placed in which ventricle? where is the drainage bag zeroed/balanced at? how low should you place the bag? too low can cause what?
Definition
lateral, foramen of munroe (auditory meatus), 0-20 cm (ordered by doc), too low can cause ventricle collapse
Term
which ICP monitor has a high incidence of infection?
Definition
subdural bolt
Term
Which ICP monitor allows for cerebral blood flow, brain tissue oxygenation, CO2, and pH to also be monitored?
Definition
the fiberoptic cable which is placed in the subdural space (camino)
Term
What type of surgery is associated with the highest incidence of VAE?
Definition
sitting cranies
Term
The formation of a VAE requires which two conditions?
Definition
open venous sinus and a pressure gradient (surgical site above heart)
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