By William S. Pease MD, Henry L. Lew MD, Ernest W. Johnson MD
Now in its Fourth version, this article provides physiatry and neurology citizens a entire, functional creation to electromyography. part I stories the anatomy and body structure of nerve difficulties with regards to the making plans and function of electrodiagnostic tactics. part II offers technical info on electrophysiology, instrumentation, and particular concepts, with electronic pictures exhibiting very important floor anatomy. part III publications physicians via a number of scientific EMG difficulties, starting with the patient's signs and continuing via electrodiagnostic review and analysis. This version comprises over 500 new illustrations.
A bound-in CD-ROM comprises electronic videoclips of EMG recordings and try questions that may be submitted for CME credit.
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4. Electrolyte disturbance 5. Local muscle trauma or ischemia Figure 2-7 ● Endplate spikes and endplate positive waves are recorded together intermittently as the needle position is changed slightly (gain ؍100 V, sweep ؍10 ms). The most common reason for increased insertional activity is that the needle electrode is in the endplate area of the muscle. This zone, also known as the motor point, is the region where muscle fibers are naturally most vulnerable to irritation and the production of an action potential (Figs.
Such membranes are semipermeable. , Naϩ, Kϩ), while small, unpolarized, lipid-soluble molecules and some gases can diffuse through the membrane. The membrane interior is in fact a liquid, as described in the fluid mosaic membrane model of Singer and Nicholson (1), with the phospholipids able to move about easily within the membrane and the interspersed proteins able to migrate about, albeit more slowly. The phospholipid molecular structure and the type and volume of proteins seated in the membrane vary among different cell types.
Infarcted muscle due to compartment syndrome). Step III: Minimal Contraction of the Muscle With the patient just barely contracting the muscle, one examines the MUP in detail and observes the rate of firing, stability of amplitude, duration, and shape. The shape will include the amplitude, duration, and number of phases (MUP is polyphasic if more than four phases). The stability of the MUAP (shape and amplitude) is critical also for diagnosis. Amplitude instability implies immaturity of a reinnervating MU.