Tulloch

A dorsal rhizotomy involves: A 100/100 pts Resection of the filum terminale Cutting motor roots Cutting sensory roots Removing a tumor - Cutting sensory roots A lab calibrated their 30db intensity to be 0db HL. If they stimulated a patient at 90db from their machines, what would be the stimulus intensity? A 100/100 pts 60 HL 60 SL 90 HL 90 HL - 60 HL A pneumatic drill would introduce what kind of artifact? A 0/100 pts 3000 Hz 500 Hz 60 Hz 1 Hz - 500 Hz A post incision basel...

"train" response - Which of the following most likely reflects sustained traction or compression of a nerve during EMG? 1 "burst" of neural activity 2 Any spontaneous EMG response 3 "train" response 4 Varying EMG activity +0.9 msec - Changing from standard headphones to foam insert transducers connected by plastic tubing will change the latency of wave 1 by about: 1 -0.5 msec 2 +0.5 msec 3 +0.9 msec 4 +2 msec 0.1 to 10 uV - Electrical amplitude of the SSEP is: 1 0.1 to 10 uV ...

5-136 At what rate do skin cells exfoliate from OR personnel? A- 10,000 cells per hour B- 20,000 cells per hour C- 50,000 cells per hour D- 30,000 cells per hour - C- 50,000 cells per hour 5-152 After 100 averages, you have a signal to noise ratio of 2:1. How many averages would it take to increase the signal to noise ratio to 15:1? A- 10000 B- 5625 C- 900 D- 225 - B- 5625 5-214

_________________ is the single most important step taken to avoid contamination A 100/100 pts Using gloves Using protective eyewear Washing hands Using a transportation barrier - Washing hands A 100 mS epoch is recorded with a 10 mS post-stimulus triggering. Which of the following best describes the resulting sweep? A 110 mS sweep starting 10 mS prior to the stimulus A 90 mS sweep starting 10 mS after the stimulus A 100 mS sweep starting 10 mS prior to the stimulus A 100 mS sweep st...

"Central Cord Syndrome" results in: - Loss of function at the level damaged due to disruption of gray matter Harrington Instrumentation includes? - Rods A "MAC" (minimal alveolar concentration) is: - The concentration at which 1/2 of the subjects move in response to stimulation such as a surgical incision A contraindication for the use of transcranial magnetic stimulation is - A cardiac pacemaker in place A false negative test? - Means that the test results do not show an abnormality w...

0.1-10 uV - Electrical amplitude of SSEPs is A. 10-100 uV B. 0.1 to 10 uV C. 1000 to 10,000 uV D. 100 to 1000 uV 0.1-5000 Hz - What is the minimum required bandpass for an EP system 0.2ms - The duration of a monophasic, rectangular pulse used for somatosensory stimulation should be: A. 0.05 ms B. 0.2 ms C. 0.5 ms D. 1 ms 10 mS - What is the minimum analysis time for ABRs? 10 msec - What is the minimum acceptable sweep for ABRs? 10 uA - What is the maximum allowable leakage current ...

-70mV inside the cell - A typical resting membrane potential of a neuron is: 1 +20 mV inside the cell 2 -20 mV inside the cell 3 +70 mV inside the cell 4 -70 mV inside the cell .1 mA - What is the max allowable chassis leakage current? 1 10 uA 2 20 uA 3 .1 mA 4 10 mA 0.1 to 10 uV - Electrical amplitude of the SSEPs is: 1 0.1 to 10 uV 2 10 to 100 uV 3 100 to 1000 uV 4 1000 to 10,000 uV 0.3-70 Hz, 15 mm/sec, 3uV/mm - Of the following, the most appropriate filter, timebase, and sens...

___ clicks help resolve wave V of the BAEP - Condensation 60 HZ filters cause a change of latency by a: - a. phase shift 60. Reduction of the high frequency filter: - c. Increases evoked potential latency A "ground loop" is created when: - Two separate devices are attached to the same patient and have two separate grounding connections A BAEP reveals an interpeak latency of 2ms between waves I and III and an interpeak latency of 3.57 between waves III and V. Subsequently MRI detects a le...

_________________ is the single most important step taken to avoid contamination. A- Using a transportation barrier B- Using gloves C- Washing hands D- Using protective eyewear - C "Central cord syndrome" results in A- loss of function at the level damaged due to disruption of gray matter B- loss of function at the level damaged due to disruption of the dura mater C- loss of function at the level damaged due to disruption of the dorsal root ganglion D- loss of function at the level da...

"Signal-to-noise ratio" relates to which of the following? 1. The amplitude of the evoked response components to the amplitude of the unrelated components 2. The ability of the instrument to resolve data and noise vertically 3. Two inputs of a differential amplifier with like negativity 4. Sensitivity scaling - 1. The amplitude of the evoked response components to the amplitude of the unrelated components (Picture of activity in Orbicularis Oris and Orbicularis Oculi) What cranial nerve ...

A 10Hz signal passing through a 10Hz locut filter will be: A) Reduced in frequency to approximately 7hz B) Affected in no way C) Reduced in amplitude by approximately 30% D) Eliminated - C) Reduced in amplitude by approximately 30% A 60Hz notch filter should not be used for evoked potential recording because of: A) The ringing artifact that comes from distortion of the stimulus artifact B) Aliasing of the signal by the filter C) 60Hz interference coming from various OR equipment D) Comm...

A patient with a history of diabetes is likely to also have: - Peripheral Radiculopathy, increased upper, lower SSEPs A positive event occurring in the lead connected to the negative terminal, will result in a deflection - Downward A selective dorsal rhizotomy is associated with: - Cerebral palsy and the severing of posterior rootlets A small unilateral increase in latency at N10 peak during surgery may be attributed to: - A decrease in body temperature A stroke associated with a carotid...

"Pre stimulus triggering? - Includes a period of recording before the stimulus A "beanbag" is often used: - In the lateral position A 60 Hz artifact will most likely be caused by: - Microscope A CMAP response to proximal facial nerve stimulation following tumor removal would indicate? - An intact neuromuscular pathway A condensation click - Causes the headphone diaphragm to displace toward the tympanic membrane A constant voltage stimulator - Varies the current in order to maintain a p...

Age Specific Normative data for BAEP is necessary under what age? - 3 years of age Constant current in SSEP Stimulation defines the ability of the stimulator to increase the intensity when which other factor is changed? - Impedance at the stimulator site Define recommended number of trials to be averaged for BAEP - 1,000-4,000 trials Define recommended pulse width for SEP stimulation - 100-300 usec or .1-.3 seconds Define recommended system set up changes which are recommended for FF- PR-VE...

A 10-bit A/D converter has how many discrete voltage values in its range? - 1024 A 10Hz signal passing through a 10 Hz locut filter will be - Reduced in amplitude by approximately 30% A 60Hz artifact would most likely be caused by: - Infusion Pump A 60Hz notch filter should not be used for evoked potential recording because of: - The ringing artifact that comes from distortion of the stimulus artifact A decrease in the power spectral edge indicates.. - a greater proportion of EEG power at ...

If you have attenuation of wave V of BAERs that persists until closing, what is the most likely cause? - Retraction of the cerebellum What is the most important setting when establishing baseline BAER data? - Side of ear stimulation When opening posterior fossa, what is the most likely cause for the attenuation of wave I of BAERs? - Drilling cranium When opening posterior fossa, what is the most likely cause for the attenuation of wave I of BAERs? - Drilling cranium A lab calibrated their...

A global significant decrease in amplitude of cortical SSEPs w/o significant decrease in amplitude of cervical and subcortical responses in a lumbar spine surgery is most possibly due to: a) Inadequate stimulation b) Changes in anesthesia regimen c) Significant blood loss due to surgery d) Damages caused by the surgery - B A loss of SSEP response would most likely occur _____ to the surgical site a) Rostral b) Caudal c) Anterior d) Posterior - B After-discharges occur after what? a) ...

A 60 Hz artifact will most likely be caused by... - Microscope A decreasing body temperature of the surgical patient monitored with EPs can result in... - Increasing latencies of SSEPs and BAERs. A delay in the latency of one eye in a PREP is diagnostic of... - Compressive lesion Optic Neuritis Ischemic Optic Atrophy A patient is admitted to the operating room diagnosed with a burst fracture of the first lumbar vertebra. The most appropriate nerve(s) to monitor would be the: - PTN and UN ...

_______________________________ is the single most important step taken to avoid contamination 1. using gloves 2. using protective eyewear 3. washing hands 4. using transportation barrier - Washing hands "Hearing level" (HL) is defined as the 1. average threshold intensity of normally hearing young adults 2. intensity of along duration sound that has the same amplitude as the peak SPL of a short duration sound 3. lowest intensity that an average ear drum can her 4. inverse of the sou...

Your initial signal amplitude is 0.5 μV inside a background noise of 2 μV, what will the signal to noise ratio be after 400 averages? - 5 You would expect a loss of BAEPs in which surgery? - Pontine glioma You want your vertical resolution to: - Match the amplitude of your input to maximize the signal You want to have matching impedances so that: - You can maximize your common mode rejection You record a spinal potential to: - Establish an AP Why is platinum used in epidural recordings -...