カフ圧による上肢虚血時の身体イメージの急激な変化

概要

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The authors examined effects of the joint position before the ischaemia on alternation of the joint angle of a phantom limb. We further investigated which nerve fiber contributes to the alternation. While we first blocked participants'upper arm with cuff?inflation, we assessed changes in the perceived joint angles as well as in sensory test. In the second block of their upper arm, we further assessed changes in the perceived joint angles when the position of the hand was changed immediately before the inflation. These experiments showed that whereas the proximal and distal interphalangeal, metacarpophalangeal and wrist joints of the phantom limb steeply changed from extended position to flexed position at the start of extended position from 10 to 25 min after the start of the inflation, the four joints changed to the opposite direction at the start of flexed position. These findings revealed that perceived joint angles of a phantom hand were changed by the position of the hand immediately before the inflation. On the other hand, while threshold of von Frey test in the thumb was changed until mean 16 min after the start of the inflation, the touch sensation in the thumb was abolished until mean 19 min. From the results of two experiments, acute perceptual distortions of joint angle thus corresponded with paralysis of the large myelinated diameter nerve.