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Electrodiagnosis
electrodiagnosis[i¦lek·trō‚dī·əg′nō·səs] (medicine) Diagnosis of disease states by recording the spontaneous electrical activity of tissue or organs, or by the response to stimulation of electrically excitable tissue. Electrodiagnosis a method of investigating the conductivity of motor nerves and the excitability of muscles by stimulation with an electric current. Electrodiagnosis is used to detect diseases or injuries to peripheral nerves and muscles. Both alternating and direct current are used. There are certain points on the surface of the body that correspond to the most electrically excitable points on each nerve and muscle. An active electrode in the form of a rod is attached to these points, and a passive electrode in the form of a wide lead plate is placed on the sternum or lower back. The threshold of excitability is determined from the minimum current intensity capable of inducing visible muscle contraction first on the healthy side and then on the affected side; quantitative changes are subsequently noted. The absence of a muscle reaction to strong stimulation implies that the nerve or muscle is dead. Nerve regeneration after an injury is judged from the restoration of excitability. Electrodiagnosis permits early detection of tetanus, myasthenia, myotonia, and other diseases. Chronaximetry is a means of electrodiagnosis whereby the electroconductivity of tissues is measured, taking into account the type and duration of current needed to evoke a response. In poliomyelitis, for example, considerable time is required to provoke a muscle response to stimulation. Electrodiagnosis is also used to diagnose some ear, eye, and internal disorders. Electro-odontodiagnosis is a method of examining sensory nerves of teeth by stimulating them with an electric current. It is used in dentistry to diagnose painful changes in the pulp or periodontium. electrodiagnosis
e·lec·tro·di·ag·no·sis (ē-lek'trō-dī'ag-nō'sis), 1. The use of electronic devices for diagnostic purposes. 2. By convention, the studies performed in the EMG laboratory, that is, nerve conduction studies and needle electrode examination (EMG proper). Synonym(s): electroneurographyelectrodiagnosis Alternative medicine
The use of an electric device to evaluate an internal organ by measuring its “electromagnetic energy balance”. For example, the “Accupath-100”, a computerised galvanometer, is used to allegedly help select and prepare homeopathic remedies and “probe” the patient’s acupuncture points on the hands, interpreting values that appear on a computer monitor. The FDA regards all such electrodiagnostic devices it has evaluated as ineffective.e·lec·tro·di·ag·no·sis (ĕ-lek'trō-dī-ăg-nō'sis) 1. The use of electronic devices for diagnostic purposes. 2. By convention, the studies performed in the electromyographic laboratory, i.e., nerve conduction studies and needle electrode examination (electromyography proper).
Synonym(s): electroneurography. 3. Determination of the nature of a disease through observation of changes in electrical activity.
Synonym(s): evoked electromyography. electrodiagnosis The general term for a wide range of diagnostic methods involving the pickup, amplification, recording and display of any of the electrical events of the body. It includes ELECTROCARDIOGRAPHY, ELECTROENCEPHALOGRAPHY, ELECTROMYOGRAPHY and ELECTRONYSTAGMOGRAPHY.e·lec·tro·di·ag·no·sis (ĕ-lek'trō-dī-ăg-nō'sis) 1. Use of electronic devices for diagnostic purposes. 2. By convention, studies performed in the electromyographic (EMG) laboratory, i.e., nerve conduction studies and needle electrode examination (EMG proper). |