Electroneurography index based on nerve conduction study data: Method and findings in control subjects

We developed a summary score of data obtained from nerve conduction studies (NCS). The principle of such approach is that when a nonrandom trend to lower amplitudes or conduction velocities is present, it may be revealed by a summary nerve conduction score. In a group of normal subjects, peroneal, s...

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Bibliographic Details
Published in:Muscle & nerve 2004-01, Vol.29 (1), p.89-96
Main Authors: Tacconi, Paolo, Manca, Davide, Tamburini, Giorgio, Ferrigno, Paola, Cossu, Gianni, Cannas, Antonino, Giagheddu, Marcello
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Biological and medical sciences
conduction velocity
Data Interpretation, Statistical
Electrodiagnosis. Electric activity recording
electroneurography
Electrophysiology - instrumentation
Electrophysiology - methods
Female
Humans
Investigative techniques, diagnostic techniques (general aspects)
Male
Medical sciences
Middle Aged
nerve conduction studies
Nervous system
Neural Conduction - physiology
peripheral nerves
Peripheral Nerves - physiopathology
Polyneuropathies - diagnosis
Polyneuropathies - physiopathology
polyneuropathy
Predictive Value of Tests
Reference Values
Regression Analysis
Reproducibility of Results
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Summary:We developed a summary score of data obtained from nerve conduction studies (NCS). The principle of such approach is that when a nonrandom trend to lower amplitudes or conduction velocities is present, it may be revealed by a summary nerve conduction score. In a group of normal subjects, peroneal, sural, ulnar, and superficial radial nerves were studied; age‐ and height‐related F‐wave and soleus H‐reflex latencies were also examined. Z‐scores of distal latencies, amplitudes, conduction velocities, F‐wave latencies, and H‐index were averaged in order to obtain three electroneurography (ENG) indices: a simple arithmetic (ENG index 1) and two weighted means (index 2 and index 3), assigning a double or triple weight to lower limb z‐scores. Reference limits were established using multiple regression equations of ENG indices against age and height. This technique could be useful in providing a better cut‐off between normal and diseased populations and in improving test–retest variability of NCS when follow‐up studies are required. Muscle Nerve 29: 89–96, 2004
ISSN:0148-639X
1097-4598
DOI:10.1002/mus.10523