P 93 TMS recruitment curve and cortical silent period analysis: a sensitive tool to detect imminent motor deficits in brain tumor patients

One of the challenges in surgery of tumors in motor eloquent areas is the individual risk assessment for postoperative motor disorder. Previously, we developed a predictive model that allows for objective evaluation of this risk prior to surgery based on topographical and neurophysiologial data derived from investigation with nTMS (navigated Transcranial Magnetic Stimulation). The input variables of the model are: (1) presence of infiltration of the primary motor cortex by the tumor, (2) the minimal distance of the tumor to the corticalspinal tract and (3) the ratio of the bihemispheric resting motor threshold (RMT).

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