CNIM Final Study Guide
An increase in stimulation intensity causes a linear increase of which of the following
SSEP components?
1. N20
2. N45
3. P31
4. P37
Epidural electrodes are made of platinum because
1. It is the most durable metal
2. It is the lowest impedance metal
3. The chance of allergic reaction is eliminated
4. Other metals may become toxic when currents are applied
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 usec. Which of the following would most likely reduce the patients
discomfort while maintaining adequate stimulation?
1. Increase stimulus duration
2. Use larger stimulating electrode
3. Use smaller stimulating electrode
4. Decrease stimulus intensity below motor threshold
Which of the following would enhance wave I of the BAEP?
1. Increase the rate
2. Increase the intensity
3. Decrease the analysis time
4. Decrease the number of repetitions
In BAEPs, wave I can most easily be differentiated from cochlear microphonics based
upon
1. Amplitude
2. Morphology
3. Click polarity
4. Absence in contralateral recording
What is the interstimulus interval of a 50 Hz click stimulus?