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July 16, 1960


JAMA. 1960;173(11):1272. doi:10.1001/jama.1960.03020290098030

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To the Editor:—  I should like to call attention to an incorrect statement in the article by Johnson and Olsen, "Clinical Value of Motor Nerve Conduction Velocity Determination," in The Journal, April 30, page 2030. On page 2034, the authors make the following statement. "Frequently it is difficult to differentiate virus encephalomyelitis from poliomyelitis. However, measuring the nerve conduction velocity provides a very useful objective method for making the diagnosis, since the conduction velocity is normal in poliomyelitis and reduced in virus encephalomyelitis."The authors quoted one of my papers on the technique of measuring nerve conduction velocity and changes incident to traumatic damage to the nerve, but they apparently missed my subsequent work bearing directly on the sentences quoted above. I showed in a series of 26 patients that the conduction velocity in patients with poliomyelitis is indeed slower than in normal persons and, further, that the degree of

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