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									Neurophysiological examination · Neurological examination · Diagnostics                                          C 04

 Electromyography (EGG) is a method of testing the activity potential of muscle tissue by electrical stimulation.

                                                                                                                        Spine Surgery Information Portal · Prof. Dr. Jürgen Harms · www.harms-spinesurgery.com
 The resting activity and active activity of the muscle at various levels of contraction are measured, revealing
 indications of potential diseases of the nerve or muscle cells.

 This method is used to measure the velocity of nerve conduction - in a healthy nerve approx.
 60m/s. This velocity is lower in a diseased nerve.

 Evoked potentials
 The	cerebral	cortex	is	painlessly	stimulated	with	magnetic	fields.	Electrodes	can	be	used	to	record	whether	and	
 how a muscle reacts to this stimulus. This method is used to measure the velocity of nerve conduction in the
 spinal cord.

 Intraoperative monitoring
 Monitoring of the functionality of the spinal cord during spinal surgery is very important.
 The evoked potentials method can be used to monitor the velocity of nerve conduction in the centripetal and
 centrifugal	spinal	cord	fibers,	significantly	reducing	the	risk	of	surgical	damage	to	the	spinal	cord.

 Doppler ultrasonography
 This examination method can be used for the imaging of blood vessels (arteries and veins), which is particularly
 important for cervical spine operations.

           Prof. Dr. med. Jürgen Harms · Klinikum Karlsbad-Langensteinbach · Guttmannstraße 1 · 76307 Karlsbad
                                  © www.harms-spinesurgery.com 2007. All rights reserved.

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