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Functional neuroimaging suggests that similar brain regions are involved in the processing of pain in healthy subjects and in patients with chronic neuropathic central pain. We present a patient with chronic neuropathic central pain due to a unique lesion to the trigeminal and spinothalamic pathway who had persistent pain relief after repeated IV lidocaine infusions. Positron emission tomography scan results showed a relative hypoactivity of the left posterolateral thalamus before treatment which disappeared after therapy. This case may suggest a stereo-selective analgesic effect of lidocaine accompanied by regional cerebral blood flow changes in the thalamus, indicating that sodium channels could, in fact, be highly expressed or modified in the thalamus after thalamic deafferentation.

The Long-Term Effect of Repeated Intravenous Lidocaine on Central Pain and Possible Correlation in Positron Emission Tomography Measurements