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