Tibial nerve somatosensory evoked potentials during EEG suppression in sevoflurane anaesthesia

Rytky, Seppo; Huotari, Ari-Matti; Alahuhta, Seppo; Remes, Raija; Suominen, Kalervo; Jäntti, V.

doi:10.1016/s1388-2457(99)00129-7

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…Despite the association between BS and deep anaesthesia, the cortex remains responsive to stimuli during BS induced by volatile anaesthetic agents (Porkkala et al 1997, Hartikainen & Rorarius 1999, Huotari et al 2004. Somatosensory and auditory stimuli cause evoked potentials and trigger bursts during EEG suppression with isoflurane or sevoflurane (Porkkala et al 1997, Hartikainen & Rorarius 1999, Rytky et al 1999. These studies indicate that the brain retains the ability to respond to external stimuli during deep anaesthesia.…”

Section: Discussionmentioning

confidence: 99%

Comparative effects of halothane, isoflurane, sevoflurane and desflurane on the electroencephalogram of the rat

2008

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SummaryInhalant anaesthetic agents are commonly used in studies investigating the electroencephalographic (EEG) effects of noxious stimuli in animals. Halothane causes less EEG depression than isoflurane, however, the EEG effects of halothane, isoflurane, sevoflurane and desflurane have not been compared in the same model. This study aimed to compare the EEG effects of these inhalational agents in the rat.Forty male Sprague-Dawley rats were assigned to four groups and anaesthetized with halothane, isoflurane, sevoflurane or desflurane. EEG was recorded from the left and right somatosensory cortices for 5 min at three different multiples of minimal alveolar concentration (MAC) (1.25, 1.5 and 1.75). Median, 95% spectral edge frequency and total power were derived and a single mean value for each was calculated for the first 60 s of each recording period. When the raw EEG contained burst suppression (BS), the BS ratio (BSR) over 60 s was calculated. No BS was found in EEG recorded from the halothane group at any concentration. BS was present at all concentrations with the other anaesthetic agents. BS was almost complete at all concentrations of isoflurane, whereas BSR increased significantly with increasing concentrations of sevoflurane and desflurane. No significant differences were found between the BSR due to the 1.75 MAC multiple of isoflurane, sevoflurane or desflurane. Halothane causes significantly less depression of cortical activity than the newer inhalant agents at equivalent multiples of MAC. These data support the hypothesis that halothane has a fundamentally different mechanism of action than the other inhalant agents.

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Section: Discussionmentioning

confidence: 99%

Comparative effects of halothane, isoflurane, sevoflurane and desflurane on the electroencephalogram of the rat

2008

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“…More recent studies indicated that these SSEPs could also trigger bursts, thus altering the spontaneous BS patterns, a phenomenon referred to as reactivity (Hartikainen et al, 1995b). Although anesthetic BS patterns were found to be reactive even to subliminal, nonnociceptive stimuli (Kroeger and Amzica, 2007;Yli-Hankala et al, 1993), with stimulus repetition, not all stimuli were able to evoke bursts (Jantti et al, 1998;Kroeger and Amzica, 2007) even at nociceptive stimulation intensity (Huotari et al, 2004;Rytky et al, 1999). The reactive behavior of BS patterns remains poorly understood, and the level of somatosensory input is typically not accounted for in BSR monitoring.…”

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confidence: 99%

Intraoperative Somatosensory Evoked Potential Monitoring Decreases EEG Burst Suppression Ratio During Deep General Anesthesia

Călin

Kumaraswamy

Braver

et al. 2014

Journal of Clinical Neurophysiology

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“…- Somatosensory-evoked potentials (SEPs): SEPs have been recorded during isoflurane-, sevoflurane- and propofol-induced BSP (Joutsen et al, 2009; Jäntti et al, 1998; MacDonald, Al Zayed, & Stigsby, 2005; Porkkala, Kaukinen, Häkkinen, & Jäntti, 1997; Rytky et al, 1999). Due to the low levels of noise in the SEPs frequency bands during suppression phases of BSP, and because of the enhancement of the first cortical components of the SEPs, SEPs are more easily identified in this stage than during the rest of BSP (Joutsen et al, 2009; Jäntti et al, 1998; Rytky et al, 1999). The major source of BSP noise in SEP recordings is the mixed frequency activity of the slow waves of bursts that occur during propofol anesthesia.…”

Section: Stimulus-related Effectsmentioning

confidence: 99%

Brain burst suppression activity.

Urrego

Greene

Rojas

2014

Psychology & Neuroscience

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There is robust clinical and experimental evidence in humans and in animals of an electroencephalographic pattern known as burst suppression (BSP); this is characterized by epochs of very low amplitude followed by bursts of high amplitude. Such a feature is observed on the electroencephalogram trace from individuals under various pathological but also physiological conditions; thus, several studies have searched for the physiological meaning and neuronal generator of the BSP. In this review we summarize the knowledge obtained worldwide on this topic, which provides important insights for sleep, anesthesia, and neuroscience research.

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Tibial nerve somatosensory evoked potentials during EEG suppression in sevoflurane anaesthesia

Cited by 15 publications

References 12 publications

Comparative effects of halothane, isoflurane, sevoflurane and desflurane on the electroencephalogram of the rat

Comparative effects of halothane, isoflurane, sevoflurane and desflurane on the electroencephalogram of the rat

Intraoperative Somatosensory Evoked Potential Monitoring Decreases EEG Burst Suppression Ratio During Deep General Anesthesia

Brain burst suppression activity.

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