EMG Quality Assurance & Compliance 3

Question 1

An EMG report is sent to the referring physician but contains a transcription error in the patient's MRN. What should occur?

Accepted Answer

Issue an addendum correcting the error and notify the referring physician

Answer

Errors in medical records must be corrected through a formal addendum that is dated, timed, signed, and communicated to all parties who received the erroneous document.

Question 2

What does 'common mode rejection ratio' (CMRR) measure in EMG equipment quality assessment?

Accepted Answer

The amplifier's ability to reject electrical signals common to both input leads

Answer

CMRR quantifies how well the differential amplifier rejects noise or interference signals that appear equally on both input leads, with higher CMRR indicating less artifact contamination.

Question 3

A patient with a pacemaker is referred for nerve conduction studies. What is the safest initial action?

Accepted Answer

Consult cardiology and review pacemaker manufacturer guidelines before proceeding

Answer

Although NCS stimulation currents are typically low, consulting cardiology and pacemaker manufacturer guidelines is required to determine whether stimulation near the device is safe.

Question 4

According to standard infection control practice, how long must high-level disinfection (HLD) be maintained for reusable EMG surface electrodes?

Accepted Answer

Contact time specified by the disinfectant manufacturer's label for HLD

Answer

The disinfectant manufacturer's label specifies the minimum contact time required to achieve high-level disinfection, and this time must be strictly followed to ensure efficacy.

Question 5

Which filtering parameter most affects the appearance of the CMAP onset latency in nerve conduction studies?

Accepted Answer

High-frequency filter (high-pass) setting

Answer

The high-frequency filter (high-pass) setting shapes the early rising phase of the CMAP; raising it excessively can cause the onset to appear later, artificially prolonging latency measurements.

(EMG) Electromyography Certification Practice Test

(EMG) Electromyography Certification Practice Test

EMG Quality Assurance & Compliance 3