| Revue: | Brazilian journal of medical and biological research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000346891 |
| ISSN: | 0100-879X |
| Autores: | Infantosi, A.F.C1 Melges, D.B1 Tierra-Criollo, C.J2 |
| Instituciones: | 1Universidade Federal do Rio de Janeiro, Programa de Engenharia Biomedica, Rio de Janeiro. Brasil 2Universidade Federal de Minas Gerais, Escola de Engenharia, Belo Horizonte, Minas Gerais. Brasil |
| Año: | 2006 |
| Periodo: | Dic |
| Volumen: | 39 |
| Número: | 12 |
| Paginación: | 1593-1603 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | The present study proposes to apply magnitude-squared coherence (MSC) to the somatosensory evoked potential for identifying the maximum driving response band. EEG signals, leads [Fpz'-Cz'] and [C3'-C4'], were collected from two groups of normal volunteers, stimulated at the rate of 4.91 (G1: 26 volunteers) and 5.13 Hz (G2: 18 volunteers). About 1400 stimuli were applied to the right tibial nerve at the motor threshold level. After applying the anti-aliasing filter, the signals were digitized and then further low-pass filtered (200 Hz, 6th order Butterworth and zero-phase). Based on the rejection of the null hypothesis of response absence (MSC(f) > 0.0060 with 500 epochs and the level of significance set at a = 0.05), the beta and gamma bands, 15-66 Hz, were identified as the maximum driving response band. Taking both leads together ("logical-OR detector", with a false-alarm rate of a = 0.05, and hence a = 0.0253 for each derivation), the detection exceeded 70% for all multiples of the stimulation frequency within this range. Similar performance was achieved for MSC of both leads but at 15, 25, 35, and 40 Hz. Moreover, the response was detected in [C3'-C4'] at 35.9 Hz and in [Fpz'-Cz'] at 46.2 Hz for all members of G2. Using the "logical-OR detector" procedure, the response was detected at the 7th multiple of the stimulation frequency for the series as a whole (considering both groups). Based on these findings, the MSC technique may be used for monitoring purposes |
| Disciplinas: | Medicina |
| Palabras clave: | Diagnóstico, Neurología, Potenciales evocados, Respuesta somatosensorial, Valor pronóstico, Nervio tibial, Oscilaciones gamma |
| Keyword: | Medicine, Diagnosis, Neurology, Evoked potentials, Somatosensorial response, Prognostic value, Tibial nerve, Gamma oscillations |
| Texte intégral: | Texto completo (Ver HTML) |
