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Microvascular decompression is the first choice for treating the primary trigeminal neuralgia to provide the most extended duration of pain freedom. However, in microvascular decompression, we found that this kind of operation is only suitable for some patients. It is of great value to objectively judge the function and abnormality of the trigeminal pain conduction pathway in guiding the operation process. This brief report investigates the value of pain evoked potential by electrical stimulation and noceciptive blink reflex in trigeminal neuralgia. We detected the pain evoked potential in 34 patients with trigeminal neuralgia and 48 healthy controls treated by electrical stimulation and blink reflex. We demonstrated no significant differences in the latencies of V 1 , V 2 , V 3 , and R 2 of the affected side and the contralateral side in patients with trigeminal neuralgia. The latencies of those four indicators of the affected side in patients with trigeminal neuralgia were notably decreased compared to those on the same side in healthy controls. The receiver operating characteristic curve analysis showed that the area under curve, sensitivity and specificity of the combined diagnosis of latency and amplitude were significantly higher than the single diagnosis. The latency and amplitude of V 1 were highly sensitive, while those of V 2 was highly specific. Trigeminal neuralgia can be effectively diagnosed by combining pain evoked potential by electrical stimulation and noceciptive blink reflex. The pathogenesis of trigeminal neuralgia should be combined with peripheral pathogenicity and the theory of central pathogenicity.

The diagnostic value of pain evoked potential by electrical stimulation combined with noceciptive blink reflex in trigeminal neuralgia