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Focus diagnosis of epilepsy using near-infrared spectroscopy
Eiju Watanabe1, Yukihiro Nagahori, Yoshiaki Mayanagi
1Department of Neurosurgery, Tokyo Metropolitan Police Hospital, Tokyo, Japan. eiju-ind@umin.ac.jp
Purpose:
We sought to establish a noninvasive method for focus diagnosis of epilepsy.
Methods:
We examined the use of multichannel near-infrared spectroscopy (NIRS). It is known as a noninvasive method of functional brain mapping. We monitored cerebral blood volume change with NIRS during long-term EEG monitoring of epilepsy in 32 cases with intractable epilepsies to diagnose the epileptogenic focus.
Results:
In 96% of cases, NIRS showed significant hyperperfusion in the side of seizure foci, whereas ictal SPECT showed hyperperfusion in 69% of cases.
Conclusions:
Ictal NIRS is a reliable method to evaluate the focus side in epilepsy, especially when it is coupled with ictal SPECT.