Abstract
Physiological functions of the spinothalamic tract (STT) and the posterior column (PC) were studied in 19 Japanese patients with HTLV-I-associated myelopathy (HAM). The former was evaluated by pain-related somatosensory evoked potentials (SEPs) following CO 2 laser stimulation, and the latter by conventional SEPs following electrical stimulation. Conduction velocity of STT and PC was significantly decreased in 9 and 14 patients, respectively, and more than half of them showed no clinical impairment of sensations (subclinical abnormality).
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