Electromyography in Clinical Practice: A Case Study Approach by Bashar Katirji

By Bashar Katirji

The one case-based consultant to electromyography-back in an absolutely revised and up-to-date re-creation! This sensible source examines the right way to method, diagnose, and deal with the main in most cases encoun-tered issues within the EMG laboratory. in response to genuine situations, it correlates sufferer heritage, actual examination, EMG findings, suitable anatomy, remedy, and follow-up to aid readers sharpen their scientific problem-solving abilities. New circumstances were further, and each case contains the most recent advances in wisdom and procedure.

  • Features learn questions, solutions, and medical discussions of the way specialists deal with situations to aid readers paintings during the difficulties provided.
  • Summarizes the result of nerve conduction stories and EMG information with standardized tables.
  • Includes greater than 2 hundred correct imaging reviews and anatomic figures.
  • Makes details effortless to discover with a uniform bankruptcy association.
  • Offers a constant method of electromyography in keeping with Dr. Katirji's extensive wisdom and medical experience.
  • 7 new case experiences, together with Hereditary Neuropathy with legal responsibility to strain Palsy, Ischemic Monomelic Neuropathy, and Myotonic Dystrophy.
  • Three new chapters on Nerve Conduction reviews, Needle EMG exam, and really good approaches.
  • Many new and revised figures that make clear advanced information.

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2 mV/D Figure 2–22. Myokymic discharge shown in a raster mode with a long sweep speed of 200 ms/division. Note that the number of potentials often changes from one burst to another, varying in this example from one to four potentials. Note also the relatively slow interburst frequency of about 2 Hz while the intraburst frequency is about 18–20 Hz. 31 frequent variability in the number of spikes per discharge (Figure 2–22). The intraburst frequency is about 30–40 Hz, while the interburst frequency is much slower and ranges from 1 to 5 Hz, which gives myokymia the sound of “marching soldiers” on the loudspeaker.

The blink reflex is most useful in unilateral lesions such as facial palsy, trigeminal neuropathy, or lower brainstem lesion. With facial nerve lesions, the R1 and R2 potentials are absent or delayed with supraorbital stimulation ipsilateral to the lesion, while the R2 response on the contralateral side is normal. 75) Absent or delayed in peripheral polyneuropathies and S1 radiculopathy ipsilateral R1 and R2, contralateral R2 are absent or delayed with ipsilateral stimulation while all responses are normal with contralateral stimulation.

The extracellularly recorded MUAP, recorded along the length of the muscle fibers and away from the endplate region, has a triphasic waveform (Figure 2–25). The initial positive Motor unit potential in lesions of anterior morn cells Normal motor unit potential in slight contraction Motor unit potential in primary muscular disorders Highly polyphasic motor unit potential Fibrillation potential Figure 2–25. Relative average durations and amplitudes of some MUAPs seen in myopathic and neurogenic disorders.

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