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From the Department of Neurology (Drs. Swanson, Hammeke, Spanaki, and Binder, and D.S. Sabsevitz and E.T. Possing) and the Comprehensive Epilepsy Center, Medical College of Wisconsin, Milwaukee; Department of Psychology (D.S. Sabsevitz), Finch University of Health Sciences/Chicago Medical School, North Chicago, IL; Neuroscience Center (Dr. Morris), St. Luke’s Hospital, Milwaukee, WI; and Department of Neurosurgery (Dr. Mueller), Medical College of Wisconsin.
Address correspondence and reprint requests to Dr. Jeffrey R. Binder, Department of Neurology, Medical College of Wisconsin, 9200 W. Wisconsin Ave., Milwaukee, WI 53226; e-mail: jbinder{at}mcw.edu
Background: Left anterior temporal lobectomy (L-ATL) may be complicated by confrontation naming deficits.
Objective: To determine whether preoperative fMRI predicts such deficits in patients with epilepsy undergoing L-ATL.
Methods: Twenty-four patients with L-ATL underwent preoperative language mapping with fMRI, preoperative intracarotid amobarbital (Wada) testing for language dominance, and pre- and postoperative neuropsychological testing. fMRI laterality indexes (LIs), reflecting the interhemispheric difference between activated volumes in left and right homologous regions of interest, were calculated for each patient. Relationships between the fMRI LI, Wada language dominance, and naming outcome were examined.
Results: Both the fMRI LI (p < 0.001) and the Wada test (p < 0.05) were predictive of naming outcome. fMRI showed 100% sensitivity and 73% specificity in predicting significant naming decline. Both fMRI and the Wada test were more predictive than age at seizure onset or preoperative naming performance.
Conclusions: Preoperative fMRI predicted naming decline in patients undergoing left anterior temporal lobectomy surgery.
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