Investigations in syringomyelia

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  • Needle electrode inserted through the skin into the muscle. The electrical activity detected by this electrode is displayed on a screen. Then patient is asked to contract muscle . size, and shape of the wave form produced on the oscilloscope provide information about the ability of the muscle to respond to nervous stimulation
  • Investigations in syringomyelia

    1. 1. Investigations in Syringomyelia • EMG • MRI
    2. 2. EMG What is it ? Test that checks the health of the muscles and the nerves that control the muscles. How is it done ? - Nerve Conduction Study - EMG/ Muscle test
    3. 3. Nerve Conduction Study - Test ability of ( motor + sensory) nerves to conduct electricity. - Differentiate between ( True nerve disorders) and ( Nerve injury ) - How is it preformed ? - V = t/d
    4. 4. Nerve Conduction Study Abnormal results mean : • Demyelination • Conduction block • Axonopathy • Any peripheral neuropathy • Damage to the spinal cord and disk herniation with nerve root compression. Common disorders Peripheral neuropathy Carpal tunnel syndrome Ulnar neuropathy Guillain-Barré syndrome
    5. 5. Nerve Conduction Study Motor NCS Stimulation of peripheral nerve , record from the muscle stimulated -Latency -Amplitude Sensory NCS Stimulation of a peripheral nerve record from a purely-sensory portion of the nerve, such as on a finger F-wave study Evaluates conduction velocity of nerves between the limb and spine H-reflex study Evaluates conduction velocity of nerves between the limb and spine
    6. 6. EMG - Differentiate primary muscle conditions from muscle weakness caused by neurological disorders - How is it done ?
    7. 7. Muscle Response Test Test to measure muscle response to nervous stimulation Somatosensory Evoked Potentials (SEPs) Investigation of Multiple Sclerosis, Brachial Plexus and Spinal Cord injuries, Coma, Brain Death Single Fiber EMG (SFEMG) Single Fiber EMG can be used to estimate the density of fibers belonging to a single motor unit Single Fiber Jitter (SFJ) Used for assessing transmission at the motor end plate Motor Unit Action Potentials (MUAPs) Myopathies lead to a decrease in duration and amplitude of MUAPs, whereas neuropathies cause an increase in duration and amplitude
    8. 8. MRI

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