Needle Electromyography Parameters Quiz
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Questions and Answers

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

  • Slowed conduction velocities in upper limb segments
  • Prolonged distal latencies
  • Conduction block in a number of sites (correct)
  • Preserved motor amplitudes in hands
  • What is the significant difference in F-wave latency between the arms and legs in the patient described?

  • Prolonged F-wave latencies in both arms and legs
  • Absent F-waves in arms and legs
  • Normal F-wave latencies in arms, absent in legs
  • Prolonged F-wave latencies in arms, normal in legs (correct)
  • What distinguishes needle electromyography from nerve conduction studies?

  • Concentric electrode configuration
  • Muscle tested at rest only
  • Assessment of sensory amplitudes
  • Disposable, single-use needle electrodes (correct)
  • What is the characteristic sensory finding in the patient with demyelinating neuropathy?

    <p>Slowing of lower limb velocities</p> Signup and view all the answers

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

    <p>Conduction block in arm nerves</p> Signup and view all the answers

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

    <p>Microvolts (µV)</p> Signup and view all the answers

    What is the primary role of EEG in neuroimaging?

    <p>Identifying neural correlates</p> Signup and view all the answers

    What does an abnormal Q wave in an ECG indicate?

    <p>Abnormal electrical activity in the heart</p> Signup and view all the answers

    In what conditions can EEG be used for diagnosis?

    <p>Identifying epilepsy and sleep disorders</p> Signup and view all the answers

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

    <p>Waveform signals</p> Signup and view all the answers

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

    <p>Microvolts (µV)</p> Signup and view all the answers

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

    <p>0.05-100 Hz</p> Signup and view all the answers

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

    <p>Heart rate monitoring</p> Signup and view all the answers

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

    <p>Motion artifacts</p> Signup and view all the answers

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

    <p>I, II &amp; III</p> Signup and view all the answers

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

    <p>Electrical potential changes</p> Signup and view all the answers

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

    <p>Frontal plane</p> Signup and view all the answers

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

    <p>His Purkinji cells</p> Signup and view all the answers

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

    <p>Repolarization of the ventricles</p> Signup and view all the answers

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

    <p>SA node</p> Signup and view all the answers

    What produces the P wave on an ECG recording?

    <p>Depolarization of the atria</p> Signup and view all the answers

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

    <p>(40 – 50) bpm</p> Signup and view all the answers

    What does an ECG measure?

    <p>Electrical potential during polarization and depolarization of heart muscles</p> Signup and view all the answers

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

    <p>Nerve disease</p> Signup and view all the answers

    What distinguishes between nerve and muscle disease during electromyography?

    <p>Size of motor unit action potentials</p> Signup and view all the answers

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

    <p>Low amplitude, short duration, polyphasic</p> Signup and view all the answers

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

    <p>Myopathy</p> Signup and view all the answers

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

    <p>Suggests myopathy</p> Signup and view all the answers

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

    <p>Myopathy</p> Signup and view all the answers

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