CLTM Practice Test

1Single Choice

During long-term EEG monitoring (LTM), the technologist is responsible for maintaining optimal recording conditions across extended recording sessions. Which of the following best describes the primary purpose of performing regular impedance checks throughout an LTM admission?

A.To verify that the patient's scalp electrode gel has not dried out, which would otherwise increase signal amplitude and cause the software to automatically terminate recording.
B.To ensure that electrode-to-scalp impedance values remain within an acceptable range (typically below 5 k) so that recorded signals are not degraded by artifact or excessive noise over the course of the recording.
C.To recalibrate the amplifier's analog-to-digital converter offset voltage, which drifts as the patient moves through different hospital units during LTM.
D.To confirm that the electrode cap has not shifted position relative to the 10 - 20 measurement landmarks, which would invalidate any post-hoc source localization performed on the recorded data.

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