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(Stroke. 1995;26:426-429.)
© 1995 American Heart Association, Inc.

Articles

Pain-Related and Electrically Stimulated Somatosensory Evoked Potentials in Patients With Stroke

Masahiko Yamamoto, MD, PhD; Teruhiko Kachi, MD, PhD Akihiro Igata, MD, PhD

From the Departments of Neurology and Clinical Research (M.Y.), Chubu National Hospital, Obu, Japan.

Correspondence to Dr Masahiko Yamamoto, Department of Clinical Research, Chubu National Hospital, 36-3 Gengo, Morioka-cho, Obu 474, Japan.

	Abstract

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Background and Purpose Pain-related somatosensory evoked potentials (SEPs) were applied to study abnormality of pain sensation in stroke, together with electrically stimulated SEPs for deep sensation.

Methods We recorded pain-related SEPs after CO₂ laser stimulation to the dorsum of the hand and electrically stimulated SEPs after median nerve stimulation at the wrist in 12 patients with stroke. We analyzed P340 in pain-related and parietal N20 in electrically stimulated SEPs.

Results In 5 patients with a putaminal lesion, P340 was absent or its latency was delayed, and N20 was absent or reduced in amplitude. In 3 patients with a thalamic lesion, P340 and N20 showed various patterns according to the involved sites. In 4 patients with a lesion in the corona radiata, P340 and N20 were normal.

Conclusions Abnormalities of P340 and N20 in the stroke location were related to impairment of the pain and vibration senses, respectively. Thus, pain-related and electrically stimulated SEPs were useful to investigate the sensory function of each structure in the central nervous system in patients with stroke.

Received July 25, 1994; revision received November 1, 1994; accepted December 16, 1994.

This Article Abstract Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Yamamoto, M. Articles by Igata, A. Search for Related Content PubMed PubMed Citation Articles by Yamamoto, M. Articles by Igata, A.