NEUROPHYSIOLOGICAL EVALUATION OF THE EFFECTIVENESS OF EARLY CAROTID ENDARTERECTOMY IN ATHEROTHROMBOTIC STROKE

Abstract

INTRODUCTION. At present, the advantages of surgical treatment over conservative methods in patients with hemodynamically significant stenosis of the carotid arteries are actively discussed. Nowadays, the main discussion issues are the time from the beginning of the stroke to the operation and the criteria for selecting patients for surgical intervention. In recent years, neurophysiological methods for studying spontaneous and evoked brain activity, which are able to identify functional disorders that have important prognostic significance, have become the most relevant.OBJECTIVE. To study the dynamics of spectral-coherent parameters of EEG and somatosensory evoked potentials in patients with ischemic atherothrombotic stroke of different severity, who were performed carotid endarterectomy on the heart attack side in an acute period.METHODS AND MATERIALS. We examined 105 patients with ischemic stroke who underwent carotid endarterectomy in the acute period, analyzed the dynamics of spectral, coherent characteristics of EEG and amplitude-latency parameters of somatosensory evoked potentials in the postoperative period.RESULTS. The dynamics of power spectra, intra-hemispheric EEG, latency and amplitude of somatosensory evoked potentials and clinical parameters were compared.CONCLUSION. It is shown that significant suppression of alpha activity power on the side of both hemispheres, decrease of intra-hemispheric coherence and amplitude of N20-P23 on the side of clinically intact hemisphere in the period up to 3 weeks after surgery determines a longer recovery of neurological deficit in the postoperative period.

Keywords

• ischemic stroke
• electroencephalography
• carotid endarterectomy
• power spectra
• coherence
• somatosensory evoked potentials