Filterability and stroke: Correlations with quantitative EEG

Abstract

The purpose of this work is to estimate the value of blood filtration time (BFT) and a simplified method of quantitative EEG (Q-EEG) in the evolution of stroke and prognostic determination. BFT is determined by the Reid & Dormandy method. EEG is known by recent studies to be related to the cerebral metabolic activity, however, in current practice: (i) visual analysis of standard EEG is time-consuming and unaccurate; (ii) Present-day methods of quantification of EEG are sophisticated and expensive; (iii) we have chosen a ‘two-channel Berg Fourier analyser’ which gives the data in the form of comprehensible compressing pictures and number sequences. Clinical state of patients is evaluated by a chart of criteria considering consciousness, motility, sensitivity, and higher functions. This work is the study of: (i) 10 patients with hemispheric stroke, having had 2 series of examination; (ii) 4 patients who died before a second examination; (iii) 6 right-handed control subjects. Results showed: (a) BFT and clinical evolution correlation is not always significant; (b) Findings of Q-EEG suggest importance of α and β frequencies.

Key Words:

• blood filtration time
• EEG (spectrum analysis)
• stroke