Study of normal standard of adult population through quantitative electroencephalography

STUDY OF NORMAL STANDARD OF ADULT POPULATION THROUGH QUANTITATIVE ELECTROENCEPHALOGRAPHY (ABSTRACT)^*. DISSERTATION. SÃO PAULO, 1998.

RENATO ANGHINAH^**

We studied the electric brain activity during wakefulness in 72 adult people, between 20 and 45 years old, through digital EEG and spectral analysis in order to propose a standardization for Brazilian adult population. All this group is healthy with laboratory examinations and clinical evaluation normal .

After Fourier fast transformation (FFT) calculation, we analyzed the behavior of most usual artifacts displayed in cartographic presentation, in order to obtain only exams free of artifacts, and 32 EEGs were excluded of initial group. We found in the other 40 EEGs a histogram display with monomodal distribution, with higher values in alpha band.

Analyzing the average of these results, different standards from the analogical traditional EEG were found, as the distribution of alpha band frontal and presence of delta activity during awake. The beta 2 and beta 3 behavior showed a diffuse distribution, that are not the usual. By the other hand, other findings are congruent to the analogical EEG as the alpha posterior predominance and the bigger presence of theta activity at the central regions.

The rhythm distribution in three age subgroups (20-29; 30-39 and 40-45 years old) showed an average of 10.0 Hz for the predominant rhythm for the three subgroups. We found a linear distribution for the delta and theta activities inversely proportional of age.

KEY WORDS: quantitative electroencephalography, reference standard, adult.

**Address: Rua Itacolomi 333 / 83, 01239-020 São Paulo SP, Brasil.Email: [e-mail]

*

Estudo do padrão normal por eletrencefalografia quantitativa para uma população adulta.(Resumo). Dissertação de Mestrado, Hospital do Servidor Público do Estado de São Paulo ¾ IAMSPE (Área Clínica Médica). Orientador: Antônio Carlos de Paiva Melo.

Publication Dates

• Publication in this collection
  03 Apr 2000
• Date of issue
  Dec 1999