Tibial far field response - Study guides, Class notes & Summaries

Which of the following would best enhance resolution of evoked potential waveforms? - Increase number of averaged stimuli What is the typical MINIMUM common mode rejection ratio of in-phase signals recommended for evoked potential instruments? - 10,000:1 Which of the following cranial nerves is most at risk during acoustic neuroma surgery? - CN VII The impedance of cup electrodes is: - Lower than needle electrodes because of their size Amplitude of an evoked potential depends on which of the...

CNIM Exam Questions With Correct Solutions | Latest Update Graded A+. Resting membrane potential is created by differences between the inside and outside of the cell in ion concentrations of 1. K+ 2. K+ and Ca++ 3. K+, Na+ and Cl4. Na+, Ca++ and Cl- - Answer K+, Na+, and ClExcitation of the postsynaptic neuron is caused by the neurotransmitter 1. gamma amino butyric acid 2. glycine 3. para amino butyric acid 4. glutamate - Answer Glutamate Wave III of the BAER is generated by the 1. su...

When recording a posterior tibial nerve SSEP, the Fpz ‐ C5s channel records - Answer subcortical far ‐ field potentials In the 10 ‐ 20 system of electrode placement, the point 20% (of the nasion‐inion distance) anterior to Cz is called - Answer Fz An electrode measured 20% lateral to Cz on the right using 10 ‐ 20 system is - Answer C4 P14 is a far ‐ field, subcortically generated response which probably reflects - Answer caudal medial lemniscal activity If over th...

You record a spinal potentialto: - correct answer Establish an Action potential (AP) What drugs would you use for language mapping? - correct answer Fentanyl D waves are recorded form which of the following electrodes? - correct answer Epidural electrodes over the spinal cord. Horizontal Dipole: - correct answer P14 What nerve roots are being monitored using the Peroneus longus muscle? - correct answer L5-S2 Which is the main reason for measuring impedances of all electrodes? - co...

If the VIIIth nerve were transected, you would get A- No change B- Increased I-III latency C- Loss of wave III - V D- Absence of all waves I-V - Answer- D- Absence of all waves I-V Epidural electrodes should be placed: A- Inside the spinal cord B- Between the dura and the spinal cord C- Above the dura D- Above the lamina - Answer- C- Above the dura Early changes to CMAPs, during the exposure of CN VII, are most likely due to: A- an increase in inhalation agents B- severe bl...

Resting membrane potential is created by differences between the inside and outside of the cell in ion concentrations of 1. K+ 2. K+ and Ca++ 3. K+, Na+ and Cl- 4. Na+, Ca++ and Cl- - Answer- K+, Na+, and Cl- Excitation of the postsynaptic neuron is caused by the neurotransmitter 1. gamma amino butyric acid 2. glycine 3. para amino butyric acid 4. glutamate - Answer- Glutamate Wave III of the BAER is generated by the 1. superior olivary complex 2. inferior colliculus 3. la...

If you have high frequency noise in a BAEP: A100/100 pts Change HFF from 3000 to 1500 Hz Change HFF to 200 Hz Change LFF to 150 Hz Change LFF to 30 Hz - Answer- Change HFF from 3000 to 1500 Hz To dissect a vestibular schwannoma, which surgical approach usually sacrifices hearing? suboccipital retrosigmoid middle cranial fossa translabyrinthine - Answer- translabyrinthine According to current OSHA standards, needle electrodes should be reused whenever possible not be soaked i...

During a median nerve preoperative study, a patient has discomfort at the wrist. Stimulation electrodes are 10 mm gold disk, stimulus intensity is 20 mA, and stimulus duration is 100 μsec. Which of the following would most likely reduce the patient's discomfort while maintaining adequate stimulation? Decrease number of repetitions What is not an advantage of epidural recordings? Absence of significant artifact The stimulation rate is determined by the analysis time Soma...

When recording a posterior tibial nerve SSEP, the Fpz ‐ C5s channel records A- subcortical near‐field potentials B- the Erb's point potential C- stationary lumbar potentials D- subcortical far ‐ field potentials CORRECT ANSWER D- subcortical far ‐ field potentials In the 10 ‐ 20 system of electrode placement, the point 20% (of the nasion‐inion distance) anterior to Cz is called A- Fz B- Fpz C- C1 D- Pz CORRECT ANSWER A- Fz An electrode measured 20% lateral to Cz on the...

in which of the following evoked potentials is the scalp position of recording electrodes most critical? Lower extremitity SSEP if an evoked potential has a voltage of 10 uV and the associated noise has a voltage of 50uV, waht is the signal to noise ration after 100 averages responses? 2:1 To display median nerve SSEP response as an upward deflection, which of the following must be known? waveform polarity and polarity convention of the amplifier inputs If an amplifier is...