カフ圧による上肢虚血時の手の大きさの急激な知覚変化

概要

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The authors examined which nerve fiber contributes to alternation of the magnitude of the phantom hand. While we blocked participants' upper arm with cuff-inflation, we assessed the perceived size of the their hand as well as changes in thermal and touch sensation. Perceived size was estimated by selection of a simple two-demensional outline or template of the hand which best matched its `size'. Prior to matching templates of the hand, in addition to the same sensory assessment of tactile sensation with a cotton swab, temperature sensation was tested with warm, cold and heat metal rods applied to the skin surface. Selection of matching templates of the hand showed that perceived area gradually increased and then reached to a 34% increase at 35 min after the inflation. Although heat pain threshold did not change during the inflation, cool threshold steeply decreased from 15 min after the inflation. The touch sensation in thumb was abolished until 20 min after the inflation, in wrist until 28 min and in the elbow until 32 min. Perceptual distortion of body size was associated with paralysis of both small and large myelinated diameter nerves.