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Collision technique

Physiologic block of nerve impulses in studies of motor nerve conduction velocity

From the Division of Clinical Electrophysiology, Department of Neurology and the Neurosensory Center, College of Medicine, University of Iowa, Iowa City, Iowa.

Commonly encountered yet not widely appreciated sources of error in the study of motor nerve conduction velocities of the median and ulnar nerves include (1) spread of stimulating current to the nerve not under study, (2) recording a volume conducted potential from distant muscles, and (3) presence of anomalous crossover in the forearm between the median and ulnar nerves. Under these circumstances, it is desirable to block impulses in one nerve without affecting those in the other. This can be achieved simply by collision if a second stimulus is delivered distally to the nerve not being tested.

Dr. Kimura's address is Division of Clinical Electrophysiology, Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City, IA 52242.

The Neurosensory Center is supported by NINCDS Program Project Grant No. NS-03354. This investigation was supported in part by a grant from the National Multiple Sclerosis Society.

Received for publication September 22, 1975.

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