Needle Electromyography Parameters Quiz

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29 Questions

Which nerve conduction study finding is most indicative of demyelinating neuropathy?

Conduction block in a number of sites

What is the significant difference in F-wave latency between the arms and legs in the patient described?

Prolonged F-wave latencies in arms, normal in legs

What distinguishes needle electromyography from nerve conduction studies?

Disposable, single-use needle electrodes

What is the characteristic sensory finding in the patient with demyelinating neuropathy?

Slowing of lower limb velocities

What is the most likely reason for reduced reflexes in the arms of the patient with demyelinating neuropathy?

Conduction block in arm nerves

Which of the following is not a parameter monitored in an ECG?

Microvolts (µV)

What is the primary role of EEG in neuroimaging?

Identifying neural correlates

What does an abnormal Q wave in an ECG indicate?

Abnormal electrical activity in the heart

In what conditions can EEG be used for diagnosis?

Identifying epilepsy and sleep disorders

Which parameter reflects the summation of synchronous postsynaptic potentials in EEG?

Waveform signals

What is the unit used to measure small electrical signals in EEG recordings?

Microvolts (µV)

What is the bandwidth range for ECG signals according to the text?

0.05-100 Hz

Which of the following is NOT mentioned as a typical application of ECG in the text?

Heart rate monitoring

What is the main source of largest measurement error in ECG according to the text?

Motion artifacts

Which leads are part of the Einthoven leads in ECG measurement?

I, II & III

What does the projection of the electric dipole vector represent in ECG readings?

Electrical potential changes

In which plane are the transverse plane leads V1-V6 located?

Frontal plane

Which part of the heart will act as a pacemaker if both the SA node and AV node are not working?

His Purkinji cells

What is the main electrical event responsible for producing the T wave in a normal heart cycle?

Repolarization of the ventricles

Which part of the heart has autorhythmic cells that contract regularly without external stimulation?

SA node

What produces the P wave on an ECG recording?

Depolarization of the atria

What is the rate of the AV node serving as a pacemaker in a healthy heart?

(40 – 50) bpm

What does an ECG measure?

Electrical potential during polarization and depolarization of heart muscles

Which type of abnormality may be signaled by any spontaneous activity in the muscle?

Nerve disease

What distinguishes between nerve and muscle disease during electromyography?

Size of motor unit action potentials

In electromyography, what pattern is indicative of a myopathic condition?

Low amplitude, short duration, polyphasic

Which condition is associated with increased early recruitment in motor unit activity?

Myopathy

What is the significance of reduced motor unit potential amplitude in an EMG study?

Suggests myopathy

When fibrillation is absent in an EMG study, what type of process is less likely to be implicated?

Myopathy

Test your knowledge on parameters evaluated during needle electromyography, including motor unit configuration, muscle activation at different force levels, and distinguishing between nerve and muscle diseases based on electrical responses. Learn about assessing single motor units and interpreting motor unit action potentials.

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