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NEUROLOGY 1986;36:1451
© 1986 American Academy of Neurology

Far-field recording of the junctional potential generated by median nerve volleys at the wrist

Jun Kimura, MD, Tetsuro Ishida, MD, Shoji Suzuki, MD, Yutaka Kudo, MD, Hiroo Matsuoka, MD and Thoru Yamada, MD

Division of Clinical Electrophysiology, University of Iowa Hospitals and Clinics, Iowa City, IA.

In 20 arms from 10 healthy subjects, the orthodromic median sensory volleys crossing the wrist gave rise to a stationary, biphasic potential rendering the forearm initially positive (Pw) and subsequently negative (Nw) compared with the hand. A pair of electrodes located on each side of the wrist best detected the junctional potential, PW-NW, that developed across the partition. Here the hand and the forearm each, in effect, acted as a lead, connecting any points within the respective compartment to the voltage source. Thus, nearly the same potential difference appeared across the wrist regardless of the inter-electrode distance, allowing the detection of the voltage step in far-field derivation. Our data verify that not only positive but also negative peaks of scalp-recorded evoked responses could represent junctional potentials generated along the course of the conduction medium in the absence of fixed neural discharges.

Address correspondence and reprint requests to Dr. Kimura. Division of Clinical Electrophysiology. University of Iowa Hospitals and Clinics, Iowa City, IA 52242.

Presented in part at the thirty-eighth annual meeting of the American Academy of Neurology, New Orleans, LA, April 1986.

Accepted for publication March 19, 1986.






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