Question

How many electrodes are normally needed for an NCV?

(a) 12

(b) 6

(c) 2

(d) 1

I have been asked this question in quiz.

This intriguing question originated from Nerve Conduction Velocity topic in section Diagnostic Investigation in Neurology and Cardiology of Clinical Science

Answer 1

The correct answer is (c) 2

To explain I would say: For a simple NCV test, 2 electrodes are enough. The electrodes are placed on two points in such a way that they lie on the same conduction path. One electrode is stimulated and the impulse generated travels down the path and the other electrode receives the signal. The time taken to travel the distance is noted along with the strength of the received signal.