Electromyographic Activity Falsely Elevates the Bispectral Index

Bruhn, Joergen; Bouillon, Thomas; Shafer, Steven L.

doi:10.1097/00000542-200005000-00042

Cited by 182 publications

(118 citation statements)

References 0 publications

Supporting

Mentioning

107

Contrasting

Unclassified

Order By: Relevance

“…However, it has been reported that BIS elevation due to this activity disappears when paralysis occurs. 17 In summary, this study suggests that SBP changes after induction of anesthesia could be more sensitive than BIS values in predicting movement in response to laryngoscopy/ intubation.…”

Section: Méthodementioning

confidence: 68%

Systolic blood pressure, not BIS, is associated with movement during laryngoscopy and intubation

Slavov

Motamed

Massou

et al. 2002

Can J Anesth/J Can Anesth

View full text Add to dashboard Cite

O Ob bj je ec ct ti iv ve e: : To compare bispectral index (BIS) values to hemodynamic variations, in order to evaluate adequacy of anesthesia during orotracheal intubation with muscle relaxants.M Me et th ho od ds s: : Forty-one patients ASA I-II, scheduled for elective peripheral surgery under general anesthesia with tracheal intubation were enrolled in the study. Fentanyl/thiopental followed by vecuronium were used for induction. Onset of relaxation was monitored at the orbicularis occuli (OO) muscle using train-of-four stimulation. Intubation was performed when no response at the OO was detected visually. Intubating conditions were noted. The "isolated forearm" technique was used to detect movement during laryngoscopy/intubation. BIS values, pulse rate (PR), and systolic pressure were recorded before induction, during laryngoscopy/intubation and 60 sec after intubation.

show abstract

Section: Méthodementioning

confidence: 68%

Systolic blood pressure, not BIS, is associated with movement during laryngoscopy and intubation

Slavov

Motamed

Massou

et al. 2002

Can J Anesth/J Can Anesth

View full text Add to dashboard Cite

show abstract

“…These results demonstrated more reliable BIS values, corroborating the following authors: Guerrero (2003), who used SQI values above 90, EMG below 30, and SR of 0; Lopes et al (2008a), who obtained EMG values below 43 and SQI above 92; and Lopes et al (2008b), who recorded SQI means above 84 and EMG below 40. These parameters are important because there is a reported increase in BIS values, due to high eletromiographic activity, which was confirmed by high EMG values (Bruhn et al, 2000). According to Hatschbach et al (2006), there is a correlation between EMG and BIS values.…”

Section: Discussionmentioning

confidence: 92%

Bispectral index in dogs with high intracranial pressure, anesthetized with propofol and submitted to two levels of FiO2

Lopes

Nunes

Dias

et al. 2011

Arq. Bras. Med. Vet. Zootec.

View full text Add to dashboard Cite

The effects of inspired oxygen fractions (FiO2) of 1 and 0.6 on bispectral index (BIS) in dogs with high intracranial pressure, submitted to a continuous rate infusion of propofol were evaluated. Eight dogs were anesthetized on two occasions, receiving, during controlled ventilation, an FiO2 = 1 (G100) or an FiO2 = 0.6 (G60). Propofol was used for induction (10mg.kg-1, IV), followed by a continuous rate infusion (0.6mg.kg-1.minute-1). After 20 minutes, a fiber-optic catheter was implanted on the surface of the right cerebral cortex to monitor the intracranial pressure, the baseline measurements of BIS values, signal quality index, suppression ratio number, electromyogram indicator, end-tidal carbon dioxide partial pressure, mean arterial pressure, intracranial pressure and cerebral perfusion pressure were taken. Then, the blood flow from the right jugular vein was interrupted in order to increase intracranial pressure and after 20 minutes additional recordings were performed at 15-minute intervals (T0, T15, T30, T45 and T60). The arterial oxygen partial pressure varied according to the changes in oxygen. For the other parameters, no significant differences were recorded. The BIS monitoring was not influenced by different FiO2.

show abstract

“…Il peut s'agir d'une éléva-tion isolée du BIS pour les raisons que nous avons déjà soulignées. 12,13 Le BIS peut rester stable alors qu'il existe des perturbations hémodynamiques comme dans le cas d'une analgésie insuffisante. Enfin il peut s'agir d'une baisse isolée du BIS qui fait alors évoquer un état de souffrance cérébrale.…”

Section: Discussionunclassified

“…Ajuster l'administration des hypnotiques ou des antalgiques employés pour l'anesthésie générale uniquement sur la mesure du BIS expose alors au risque d'une anesthésie excessive. 12,13 Des cas cliniques ont été rapportés dans la littéra-ture illustrant des modifications du BIS alors que l'anesthésie des patients était à priori stable. Il peut s'agir d'une élévation du BIS comme dans le cas de modifications induites par une activité musculaire ou par des interférences liées à des appareils médicaux.…”

unclassified