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NCS Final Exam Questions with Correct Answers

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NCS Final Exam Questions with Correct Answers

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NCS Final Exam Questions with
Correct Answers
How to reduce impedance - ANSWER-Clean skin, remove oils, use gel, secure
electrodes

Ground electrode function - ANSWER-Reduces noise and provides patient safety

Ground placement - ANSWER-Between stimulator and recording electrodes

Why only one ground - ANSWER-Prevents ground loops and noise

Signs of poor grounding - ANSWER-60 Hz noise, unstable baseline, distorted
waveforms

Central line risk - ANSWER-Direct pathway to heart increases electrical danger

Equipment safety rule - ANSWER-Never turn equipment on/off while electrodes are
attached

Pacemaker precaution - ANSWER-Avoid stimulation near device

Purpose of filters - ANSWER-Remove unwanted electrical noise

Motor filter settings - ANSWER-LFF 2 Hz, HFF 10 kHz

Sensory filter settings - ANSWER-LFF 20 Hz, HFF 3 kHz

Sweep speed - ANSWER-Controls time (ms/div)

Sensitivity (gain) - ANSWER-Controls amplitude (mV or µV)

Latency - ANSWER-Time from stimulus to first deflection

What latency reflects - ANSWER-Myelin integrity

Causes of prolonged latency - ANSWER-Demyelination, cold limb, incorrect distance

Amplitude - ANSWER-Height of waveform

What amplitude reflects - ANSWER-Number of functioning axons

Low amplitude suggests - ANSWER-Axonal loss or technical error

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