THE CHANGES OF TOUCH THRESHOLD ON THE FACE OF PATIENT WITH TRIGEMINAL NEURALGIA

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Gamma knife surgery (GKS) has reported to be an effective and safety method for trigeminal neuralgia (TN). However, it has reported that after having received GKS, several percent of patients has felt numbness on the face. Then we measured the touch threshold on the facial skin to search the detail of them. Five patients diagnosed with TN of second branch were irradiated a maximum dose of 90 Gy at retro Gasserian after the target area were coordinated with MRI and CT. All patients were investigated the touch threshold on the lateral of nasal wing, subocular region and ear anterior parts using Semmes-Weinstein monofilaments before and 1, 3, 6, and 12 months after GKS. We compared with thresholds between healthy side and disease side. Though they had severe pain on the lateral area of nasal wing at first visiting, amblyaphia was assessed at the three areas, which showed individual characteristic. Touch threshold of totally 3 areas on the disease side was significant higher than that on the healthy side before and 1,3 months after GKS. This result suggested that the amblyaphia might be cognized on the wide area of face, which resulted from severe pain of TN and radiation.

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