Hyperventilation revisited: Physiological effects and efficacy on focal seizure activation in the era of video-EEG monitoring

Hyperventilation revisited: Physiological effects and efficacy on focal seizure activation in the era of video-EEG monitoring

Autor Guaranha, Mirian SB Google Scholar
Garzon, Eliana Autor UNIFESP Google Scholar
Buchpiguel, Carlos A. Google Scholar
Tazima, Sergio Google Scholar
Yacubian, Elza MT Autor UNIFESP Google Scholar
Sakamoto, Américo C. Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Resumo Purpose: Hyperventilation is an activation method that provokes physiological slowing of brain rhythms, interictal discharges, and seizures, especially in generalized idiopathic epilepsies. in this study we assessed its effectiveness in inducing focal seizures during video-EEG monitoring.Methods: We analyzed the effects of hyperventilation (HV) during video-EEG monitoring (video-EEG) of patients with medically intractable focal epilepsies. We excluded children younger than 10 years, mentally retarded patients, and individuals with frequent seizures.Results: We analyzed 97 patients; 24 had positive seizure activation (PSA), and 73 had negative seizure activation (NSA). No differences were found between groups regarding sex, age, age at epilepsy onset, duration of epilepsy, frequency of seizures, and etiology. Temporal lobe epilepsies were significantly more activated than frontal lobe epilepsies. Spontaneous and activated seizures did not differ in terms of their clinical characteristics, and the activation did not affect the performance of ictal single-photon emission computed tomography (SPECT).Conclusions: HV is a safe and effective method of seizure activation during monitoring. It does not modify any of the characteristics of the seizures and allows the obtaining of valuable ictal SPECTs. This observation is clinically relevant and suggests the effectiveness and the potential of HV in shortening the presurgical evaluation, especially of temporal lobe epilepsy patients, consequently reducing its costs and increasing the number of candidates for epilepsy surgery.
Palavra-chave EEG
video-EEG
hyperventilation
seizure activation
monitoring
Idioma Inglês
Data de publicação 2005-01-01
Publicado em Epilepsia. Malden: Blackwell Publishing Inc, v. 46, n. 1, p. 69-75, 2005.
ISSN 0013-9580 (Sherpa/Romeo, fator de impacto)
Publicador Blackwell Publishing Inc
Extensão 69-75
Fonte http://dx.doi.org/10.1111/j.0013-9580.2005.11104.x
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000226810000009
Endereço permanente http://repositorio.unifesp.br/handle/11600/28056

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