Electric Euro & shy; chromatography (ENG): Implementation
A electroneurography (ENG) requires no special preparation generally. Before performing it is only advisable to evaluate the patient neurologically ..
Use the electroneurography can be identified two types of nerve conduction velocity (NCV): The motor nerve conduction velocities and the sensitive nerve.
To the motor nerves include those who are responsible for the control of movements. To initiate a stimulus that occurs in the brain, for example, to the corresponding muscle.
Not so with the sensory nerves: Forward stimuli that we receive through our senses cells to the brain. So the nerves react as if we touch an object and send information to the brain.
To measure the NLG motor the doctor attached different types of surface electrodes on the skin of the patient, and specifically where the nerve to be examined is located. The distance between two electrodes is measured prior to conducting. Thus, one can determine exactly is the speed at which the electrical stimulus from electrode 1 to the electrode 2 passes. This so-called stimulation electrodes to be inspected of the nerve is stimulated at least twice by a weak short current pulse. The nerve passes the electrical stimulus. The lead-out registers the moment when the stimulus reaches the appropriate muscle. The nerve conduction velocity is calculated from the measured times and the distance between the trigger points - usually elapse between nerve stimulation and muscle contraction just a few thousandths of a second.
In the measurement of NLG sensitive means electroneurography a nerve by surface or needle electrodes is irritated. The lead electrode is located directly above the corresponding nerve so that the nerve conduction velocity is calculated from the measured transmission time and the distance between the two electrodes.