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Journal of the Korean Academy of Rehabilitation Medicine 1994;18(1):2.
Study on the Anodal Block in Clinical Electrodiagnosis
Hee-Kyu Kwon, M.D., , Hang-Jae M.D.*
Department of Rehabilitation Medicine, Korea University College of Medicine, Department of Physical Medicine and Rehabilitation, UMD-New Jersey Medical School*
임상 전기진단에서 양극차단에 관한 연구
권희규, 이항재*
고려대학교 의과대학 재활의학교실 및 뉴저지 의과대학 재활의학과*

Anodal block, a local block of nerve conduction caused by hyperpolarization of the nerve cell membrane under the anode, has been described when the anode is inadvertently placed between the cathode and recording electrode. This phenomenon has been documented in animal studies but not in humans.

In this investigation, the measured latencies and amplitudes in median nerve motor and sensory conduction, and the H-reflex studies were not significantly different when the anode placed proximally or distally to the cathode. However, when orthodromic sensory conduction studies were performed with anode-active recording electrode and gradually increasing intensities of stimulation, prolonged latencies were observed with low intensities. Furthermore, moderate stimuli intensities led to double peak potentials, most prominently displayed with a 4 cm anode-cathode separation. With further increases in intensity of the stimulation, the double peak potentials disappeared and the latencies shorten.

Key Words: Anodal block, Anodal stimulation, Hyperpolarization, Nerve conduction
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