caa a22 4500 465826156 CHVBK 20180323112149.0 cr unu---uuuuu 170327e19900401xx s 000 0 eng 10.1007/BF02828281 doi (NATIONALLICENCE)springer-10.1007/BF02828281 The prognostic value of somatosensory evoked potential monitoring and tumor data in supratentorial tumor removal [Elektronische Daten] [Alfred Witzmann, Helmut Beran, Hildegard Böhm-Jurkovic, Walter Löffler] The aim of this study was to find appropriate somatosensory evoked potential (SSEP) and tumor data that would predict immediate postoperative outcome. Seventeen patients were evaluated, all with supratentorial mass lesions. Intraoperative SSEP monitoring was carried out, and central conduction time, N20 amplitude, and N20 to N13 amplitude ratio were recorded throughout the operation. The differences between the end and the start of the procedure and between the end of the operation and the most substantial changes during tumor removal were calculated for statistical evaluation. Tumor location and extent were carefully determined and calculated by computed tomographic reconstructions in the axial and sagittal planes. Several tumor parameters were measured: the distances from the midpoint of the tumor to the central sulcus, midline, and base of the skull and the longitudinal and cross-sectional diameters. The electrophysiologic and tumor data sets were correlated with the immediate postoperative neurologic deterioration. For this purpose, patients were divided into two groups: group 1 = no neurologic deterioration after operation (13 patients); group 2 = neurologic deterioration after operation (4 patients). The difference in central conduction times between the end and the start of the procedure was the only variable that exhibited a significant influence on the immediate postoperative condition (P = 0.007), as determined by analysis of variance. The other electrophysiologic data as well as the tumor data failed the significance threshold ofP = 0.05. Discriminant analysis was applied to test the classification capacity of the measured variables. Involving all measured variables (electrophysiologic and tumor data), discriminant analysis allowed a correct classification of all 17 patients to their proper neurologic deterioration group. Discriminant analysis for SSEP data alone led to 15 correct classifications. Tumor data, used alone for discriminating procedures, revealed 14 correct classifications. When each variable was analyzed separately, only the difference in central conduction times between the end and the start of the procedure gave significant predictions, namely, 15 correct classifications. This was the same number as achieved by all electrophysiologic variables together. No other variable could on its own yield any valid prognosis for assessment of immediate postoperative neurologic deterioration. The data confirm the importance of central conduction time recovery before the end of the operation on the patient's immediate postoperative neurologic condition. Little, Brown and Company, 1990 Somatosensory evoked potentials nationallicence Surgery: tumor resection nationallicence Witzmann Alfred Department of Neurosurgery, Johannes Kepler University, Linz, Austria aut Beran Helmut Institute of Systems Science, Department of Statistics, Johannes Kepler University, Linz, Austria aut Böhm-Jurkovic Hildegard Department of Neuroradiology, Johannes Kepler University, Linz, Austria aut Löffler Walter Anesthesiology and Intensive Care Medicine, Wagner Jauregg Krankenhaus, Johannes Kepler University, Linz, Austria aut Journal of Clinical Monitoring Springer Netherlands 6/2(1990-04-01), 75-84 0748-1977 6:2<75 1990 6 10877 https://doi.org/10.1007/BF02828281 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02828281 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Witzmann Alfred Department of Neurosurgery, Johannes Kepler University, Linz, Austria aut NATIONALLICENCE 700 1- Beran Helmut Institute of Systems Science, Department of Statistics, Johannes Kepler University, Linz, Austria aut NATIONALLICENCE 700 1- Böhm-Jurkovic Hildegard Department of Neuroradiology, Johannes Kepler University, Linz, Austria aut NATIONALLICENCE 700 1- Löffler Walter Anesthesiology and Intensive Care Medicine, Wagner Jauregg Krankenhaus, Johannes Kepler University, Linz, Austria aut NATIONALLICENCE 773 0- Journal of Clinical Monitoring Springer Netherlands 6/2(1990-04-01), 75-84 0748-1977 6:2<75 1990 6 10877 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer