ACNS Guidelines 2025
Ground to chassis resistance must be - answerless than 0.5 ohms
Chassis leakage current must be - answerless than 300uA (used to be 100uA
Amplifier leakage to the patient must be - answerless than 10uA
Leakage into the amplifier from patient leads - answer with 120Vrms applied must be
less than 10uA, or 20uA with patient leads attached
OR grounding must be such that - answer across 1kohm at 60Hz must measure less
than 20mV
The impedance at the amplifiers inputs (input impedance) must be - answer greater
than or equal to 100Mohms
With filters wide open, the amplifier bandpass measured at -3dB must be at least... -
answer0.1 Hz - 5KHz
Whats the maximum current leakage at the patient end of the lead when the power line
ground is disconnected?
Clinical - answer50uA
According to clinical, how often should you run a calibration? - answerPeriodically
Do we measure short, medium, or long AEPs? when does it occur? - answerWe
measured short-latency AEPs that occur 10-15ms after stimulus onset
What kind of BAEP clicks do we use? - answerBroadband alternating clicks with 100us
rectangular pulse
What should your BAEP stimulus rates be? - answerCan be between 5-200/s but 8-10
is suggested because you get the best I-V peaks that way
How often should you calibrate BAEP system? - answerEvery 6 months
What stimulation intensities would you use for BAEPs (Clinical & IOM) - answerClinical:
40-120 dB peSPL
IOM: 40-60dB HL or 100dB peSPL
Ground to chassis resistance must be - answerless than 0.5 ohms
Chassis leakage current must be - answerless than 300uA (used to be 100uA
Amplifier leakage to the patient must be - answerless than 10uA
Leakage into the amplifier from patient leads - answer with 120Vrms applied must be
less than 10uA, or 20uA with patient leads attached
OR grounding must be such that - answer across 1kohm at 60Hz must measure less
than 20mV
The impedance at the amplifiers inputs (input impedance) must be - answer greater
than or equal to 100Mohms
With filters wide open, the amplifier bandpass measured at -3dB must be at least... -
answer0.1 Hz - 5KHz
Whats the maximum current leakage at the patient end of the lead when the power line
ground is disconnected?
Clinical - answer50uA
According to clinical, how often should you run a calibration? - answerPeriodically
Do we measure short, medium, or long AEPs? when does it occur? - answerWe
measured short-latency AEPs that occur 10-15ms after stimulus onset
What kind of BAEP clicks do we use? - answerBroadband alternating clicks with 100us
rectangular pulse
What should your BAEP stimulus rates be? - answerCan be between 5-200/s but 8-10
is suggested because you get the best I-V peaks that way
How often should you calibrate BAEP system? - answerEvery 6 months
What stimulation intensities would you use for BAEPs (Clinical & IOM) - answerClinical:
40-120 dB peSPL
IOM: 40-60dB HL or 100dB peSPL
