Pearls and Pitfalls in the Use of Electromyography and Nerve Conduction Studies

ABSTRACT

This review aims to remind you of some of the fallibility of electromyography (EMG) and nerve conduction studies, as well as their usefulness. Areas covered will include designing the nerve conduction and EMG study, variables that effect the test including aging and temperature, how extensive a study needs to be, the importance of patient cooperation, interpretation of spontaneous discharges, types of electrical interference, and the importance of looking at the waveforms themselves from nerve conduction studies.

KEYWORDS

EMG - nerve conduction studies - EMG variables - electrical interference

REFERENCES

• 1 Wilbourn A. Thoracic outlet syndromes.  Neurol Clin . 1999;  17 477-497
• 2 Kimura J. Principles and variations of nerve conduction studies. In: Kimura J, ed. Electrodiagnosis in Diseases of Nerve and Muscle: Principles and Practice 3rd ed. New York: Oxford University Press 2001: 109-111
• 3 Wang A K, Raynor E M, Blum A S, Rutkove S B. Heat sensitivity of sensory fibers in carpal tunnel syndrome.  Muscle Nerve . 1999;  22 37-42
• 4 Denys E H. The influence of temperature in clinical neurophysiology: AAEM minimonograph #14.  Muscle Nerve . 1991;  14 795-811
• 5 Rutkove S B. The effects of temperature in neuromuscular electrophysiology: AAEM minimonograph #14.  Muscle Nerve . 2001;  24 867-882
• 6 Jones H R. Pediatric electromyography. In: Brown WF, Bolton CF, eds. Clinical Electromyography 2nd Ed. Stoneham, MA: Butterworth-Heinemann 1993: 693-794