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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