P-EG007. EEG power asymmetry as predictor of recovery in acute ischemic stroke patients

Introduction. After a stroke, optimal recovery of movement depends on the potential for neuroplasticity which allows surviving brain regions to reorganize into effective capable networks of supporting arm and hand function. There is evidence that reduced lateralized activation reflects the increased activity in the contralesional hemisphere, which reduces the extent of interhemispheric balance as demonstrated in many stroke studies. QEEG provides an objective measure of EEG asymmetry that correlates with clinical status and brain asymmetry seen on MRI. The objective of this study is to know whether EEG power asymmetry in the acute phase of stroke can predict stroke recovery after 90 days using the NIHSS score. Methods. All participants in this study underwent qEEG examination when they were in the acute phase of stroke. There are 4 power asymmetry (delta, theta, alpha, and beta) and ROC analysis are performed to determine the cut off of each band. On the 90th day after stroke onset, NIHSS examination was conducted. The statistical analysis was done by comparing the means of NIHSS score at 90 days in a group with and without asymmetry power of each band in qEEG. Results. Fifty-one subjects have accomplished this study. There are 16 participants with asymmetry and 35 participants without asymmetry result in alpha power. A significant result between alpha band power asymmetry 4+4,27 and symmetry 1,7+2,6 with 90th day of NIHSS (p=0,025) but there is no significant results in delta (p=0,066), theta (p=0,973), and beta asymmetry (p=0,323). Conclusion. Brain asymmetry quantitative EEG can describe the value of NIHSS day 90.