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Alternative sensor montage for Index based EEG monitoring. A systematic review

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Abstract

The main objective of this systematic review is to assess the reliability of alternative positions of processed electroencephalogram sensors for depth of anesthesia monitoring and its applicability in clinical practice. A systematic search was conducted in PubMed, Embase, Cochrane Library, Clinical trial.gov in accordance with reporting guidelines of PRISMA statement together with the following sources: Google and Google Scholar. We considered eligible prospective studies, written in the English language. The last search was run on the August 2023. Risk of bias and quality assessment were performed. Data extraction was performed by two authors and results were synthesized narratively owing to the heterogeneity of the included studies. Thirteen prospective observational studies (438 patients) were included in the systematic review after the final assessment, with significant diversity in study design. Most studies had a low risk of bias but due to lack of information in one key domain of bias (Bias due to missing data) the overall judgement would be No Information. However, there is no clear indication that the studies are at serious or critical risk of bias. Bearing in mind, the heterogeneity and small sample size of the included studies, current evidence suggests that the alternative infraorbital sensor position is the most comparable for clinical use when the standard sensor position in the forehead is not possible.

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References

  1. Shafer SL, Stanski DR. Defining depth of anesthesia. Handb Exp Pharmacol. 2008;182:409–23. https://doi.org/10.1007/978-3-540-74806-9_19.

    Article  CAS  Google Scholar 

  2. Sleigh JW. Depth of anesthesia: perhaps the patient isn’t a submarine. Anesthesiology. 2011;115(6):1149–50. https://doi.org/10.1097/aln.0b013e3182390396.

    Article  PubMed  Google Scholar 

  3. Shander A, Lobel GP, Mathews DM. Brain monitoring and the depth of anesthesia: another goldilocks dilemma. Anesth Analg. 2018;126(2):705–9. https://doi.org/10.1213/ANE.0000000000002383.

    Article  PubMed  Google Scholar 

  4. Lobo FA, Shander A. Modern anesthetic noninvasive monitoring: a deep look into perioperative care. J Cardiothorac Vasc Anesth. 2019;33(Suppl 1):S1–2. https://doi.org/10.1053/j.jvca.2019.03.037.

    Article  PubMed  Google Scholar 

  5. Li Y, Bohringer C, Liu H. Double standard: why electrocardiogram is standard care while electroencephalogram is not? Curr Opin Anaesthesiol. 2020;33(5):626–32. https://doi.org/10.1097/ACO.0000000000000902.

    Article  PubMed  Google Scholar 

  6. Sepúlveda PO, Vera R, Fernández MS, Lobo FA. Linear thinking does not reflect the newer 21st-century anesthesia concepts. A narrative review. J Clin Monit Comput. 2023;37(5):1133–44. https://doi.org/10.1007/s10877-023-01021-5.

    Article  PubMed  Google Scholar 

  7. Zanner R, Pilge S, Kochs EF, Kreuzer M, Schneider G. Time delay of electroencephalogram index calculation: analysis of cerebral state, bispectral, and Narcotrend indices using perioperatively recorded electroencephalographic signals. Br J Anaesth. 2009;103(3):394–9. https://doi.org/10.1093/bja/aep198.

    Article  CAS  PubMed  Google Scholar 

  8. Dahaba AA. Different conditions could result in the bispectral index indicating an incorrect hypnotic state. Anesth Analg. 2005;101(3):765–73. https://doi.org/10.1213/01.ane.0000167269.62966.af.

    Article  PubMed  Google Scholar 

  9. Lobo FA, Schraag S. Limitations of anaesthesia depth monitoring. Curr Opin Anaesthesiol. 2011;24(6):657–64. https://doi.org/10.1097/ACO.0b013e32834c7aba.

    Article  PubMed  Google Scholar 

  10. Buzsáki G, Anastassiou CA, Koch C. The origin of extracellular fields and currents–EEG, ECoG. LFP and spikes Nat Rev Neurosci. 2012;13(6):407–20. https://doi.org/10.1038/nrn3241.

    Article  CAS  PubMed  Google Scholar 

  11. Blum, Rutkove SB. The clinical neurophysiology primer edited by Andrew S. Blum, Seward B. Rutkove. Humana. 2007. https://doi.org/10.1007/978-1-59745-271-7

  12. Fisch BJ. Fisch and Spehlmann EEG primer: basic principles of digital and analog EEG. 3rd ed. Elsevier Science B.V. 1999.

  13. Page MJ, McKenzie JE, Bossuyt PM, Boutron I, Hoffmann TC, et al. The PRISMA 2020 statement: an updated guideline for reporting systematic reviews. BMJ. 2021;372:n71. https://doi.org/10.1136/bmj.n71.

    Article  PubMed  PubMed Central  Google Scholar 

  14. International prospective register of systematic reviews, PROSPERO, Available from https://www.crd.york.ac.uk/prospero/. Accessed 6 July 2022.

  15. Sterne JAC, Hernán MA, Reeves BC, Savović J, Berkman ND, et al. ROBINS-I: a tool for assessing risk of bias in non-randomized studies of interventions. BMJ. 2016;355:4919. https://doi.org/10.1136/bmj.i4919.

    Article  Google Scholar 

  16. Moola S, Munn Z, Tufanaru C, Aromataris E, Sears K, et al. Chapter 7: Systematic reviews of etiology and risk. In: Aromataris E, Munn Z, editors. Joanna Briggs Institute Reviewer’s Manual. The Joanna Briggs Institute. 2017. Available from https://reviewersmanual.joannabriggs.org/. Accessed 6 July 2022.

  17. Gagnier JJ, Kienle G, Altman DG, Moher D, Sox H, Riley D. The CARE guidelines: consensus-based clinical case reporting guideline development. Headache: J Head Face Pain. 2013;53(10):1541–7.

    Article  Google Scholar 

  18. Kim YS, Lim BG, Lee IO. False elevation of bispectral index with a mandibular position in a patient undergoing craniotomy. J Neurosurg Anesthesiol. 2014;26(3):265–7. https://doi.org/10.1097/ANA.0000000000000011.

    Article  PubMed  Google Scholar 

  19. Ayub A, Balakrishnan I, Lalwani P, Rath GP. Index of consciousness monitoring is possible with placement of electrodes in the occipital region J Neuroanaesth. Crit Care. 2014;01(02):153–4. https://doi.org/10.4103/2348-0548.130413.

    Article  Google Scholar 

  20. Sinha PK, Suneel PR, Unnikrishnan KP, Smita V, Rathod RC. An alternative site for entropy sensor placement. Anesth Analg. 2006;102(4):1291.

    Article  PubMed  Google Scholar 

  21. Hemmerling TM, Deschamps S, Michaud G, Trager G. An unusual site for BIS monitoring. Anesth Analg. 2004;99(4):1264–5. https://doi.org/10.1213/01.ANE.0000133945.35317.4B.

    Article  PubMed  Google Scholar 

  22. Dubey JK, Goel N, Chawla R, Gupta M, Bhardwaj M. Supralabial site: an alternative site for bispectral index monitoring: a cross-sectional study. J Neuroanaesthesiol Crit Care. 2022;9(3):149–54. https://doi.org/10.1055/s-0042-1756430.

    Article  Google Scholar 

  23. Tufegdzic B, Lamperti M, Khozenko A, Achi E, Jayaprakasam S, St John TL. Validation of a nasal SedLine® sensor placement: Going beyond the forehead when depth of anesthesia is important. Interdiscip Neurosurg. 2021;26:101310. https://doi.org/10.1016/j.inat.2021.101310.

    Article  Google Scholar 

  24. Romito JW, Folefac DA, Manjunath A, Yang A, Romito BT, et al. Comparison of bispectral index monitor data between standard frontal-temporal position and alternative nasal dorsum position in the intensive care unit: a pilot study. J Neurosci Nurs. 2022;54(1):30–4. https://doi.org/10.1097/JNN.0000000000000635.

    Article  PubMed  Google Scholar 

  25. Hajiyeva K, Meco BC, Guclu CY, Yorukoglu D, Doganay B, et al. Comparison of nasal and frontal BIS monitoring in neurosurgery: does the site of sensor placement affect the BIS values? Int J Clin Med. 2021;12:108–14. https://doi.org/10.4236/ijcm.2021.123012.

    Article  Google Scholar 

  26. Vachnadze DI, Akselrod BA, Guskov DA, Goncharova AV. Anesthesia depth monitoring using alternative placement of entropy sensors: a prospective study. J Clin Monit Comput. 2019;33(5):871–6. https://doi.org/10.1007/s10877-018-00238-z.

    Article  PubMed  Google Scholar 

  27. Puente-Barbas JA, Navarro-Suay R, Gutiérrez-Ortega C, Gilsanz-Rodríguez F. Comparative study of concordance between bispectral index recordings obtained from the standard frontal and infra-orbital sensor position. Eur J Anaesthesiol. 2018;35(9):714–6. https://doi.org/10.1097/EJA.0000000000000795.

    Article  PubMed  Google Scholar 

  28. Akavipat P, Hungsawanich N, Jansin R. Alternative placement of bispectral index electrode for monitoring depth of anesthesia during neurosurgery. Acta Med Okayama. 2014;68(3):151–5. https://doi.org/10.18926/AMO/52655.

    Article  PubMed  Google Scholar 

  29. Brigid JB. The acceptability of auricular versus frontal Bispectral Index Values. BJA: British J Anaesthesia 113(eLetters Supplement): No Pagination Specified. https://doi.org/10.1093/bja/el_11327

  30. Lee SY, Kim YS, Lim BG, Kim H, Kong MH, Lee IO. Comparison of bispectral index scores from the standard frontal sensor position with those from an alternative mandibular position. Korean J Anesthesiol. 2014;66(4):267–73. https://doi.org/10.4097/kjae.2014.66.4.267.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  31. Nelson P, Nelson JA, Chen AJ, Kofke WA. An alternative position for the BIS-Vista montage in frontal approach neurosurgical cases. J Neurosurg Anesthesiol. 2013;25(2):135–42. https://doi.org/10.1097/ANA.0b013e31826ca3a0.

    Article  PubMed  Google Scholar 

  32. Dahaba AA, Xue JX, Zhao GG, Liu QH, Xu GX, et al. BIS-vista occipital montage in patients undergoing neurosurgical procedures during propofol-remifentanil anesthesia. Anesthesiology. 2010;112(3):645–51. https://doi.org/10.1097/ALN.0b013e3181cf4111.

    Article  CAS  PubMed  Google Scholar 

  33. Horiuchi T, Kawaguchi M, Kurita N, Inoue S, Furuya H. The validity of bispectral index values from a dislocated sensor: a comparison with values from a sensor located in the commercially recommended position. Anesth Analg. 2007;104(4):857–9. https://doi.org/10.1213/01.ane.0000258764.37968.bb.

    Article  PubMed  Google Scholar 

  34. Shiraishi T, Uchino H, Sagara T, Ishii N. A comparison of frontal and occipital bispectral index values obtained during neurosurgical procedures. Anesth Analg. 2004;98(6):1773–5. https://doi.org/10.1213/01.ANE.0000121344.69058.09.

    Article  PubMed  Google Scholar 

  35. McGuinness LA, Higgins JPT. Risk-of-bias VISualization (robvis): An R package and Shiny web app for visualizing risk-of-bias assessments. Res Syn Meth. 2020;12:1–7. https://doi.org/10.1002/jrsm.1411.

    Article  Google Scholar 

  36. Seeck M, Koessler L, Bast T, Leijten F, Michel C, et al. The standardized EEG electrode array of the IFCN. Clin Neurophysiol. 2017;128(10):2070–7. https://doi.org/10.1016/j.clinph.2017.06.254.

    Article  PubMed  Google Scholar 

  37. Kochs E, Bischoff P, Pichlmeier U, Schulte am Esch J. Surgical stimulation induces changes in brain electrical activity during isoflurane/nitrous oxide anesthesia A topographic electroencephalographic analysis. Anesthesiology. 1994;80(5):1026–34. https://doi.org/10.1097/00000542-199405000-00012.

    Article  CAS  PubMed  Google Scholar 

  38. Bruhn J, Bouillon TW, Shafer SL. Electromyographic activity falsely elevates the bispectral index. Anesthesiology. 2000;92(5):1485–7. https://doi.org/10.1097/00000542-200005000-00042.

    Article  CAS  PubMed  Google Scholar 

  39. Schuller PJ, Newell S, Strickland PA, Barry JJ. Response of bispectral index to neuromuscular block in awake volunteers. British J Anaesthesia. 2015;115(1):95–103. https://doi.org/10.1093/bja/aev072.

    Article  Google Scholar 

  40. Zanner R, Pilge S, Kochs EF, Kreuzer M, Schneider G. Time delay of electroencephalogram index calculation: analysis of cerebral state, bispectral, and Narcotrend indices using perioperatively recorded electroencephalographic signals. Br J Anaesth. 2009;103(3):394–9. https://doi.org/10.1093/bja/aep198.

    Article  CAS  PubMed  Google Scholar 

  41. Abdelrahman AMF, Elbadry AA, Omara AF. Comparison of post-auricular and frontal bispectral index values obtained during renal surgeries. BMC Anesthesiol. 2023;23(1):417. https://doi.org/10.1186/s12871-023-02372-x.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  42. Isik OG, Chauhan V, Ahmed MT, Chang BA, Cassim TZ, et al. Alternate electrode placements to facilitate frontal electroencephalography monitoring in anesthetized and critically Ill patients. J Neurosurg Anesthesiol. 2024. ahead of print. https://doi.org/10.1097/ANA.0000000000000955

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Acknowledgements

The authors acknowledge Philip Anderson for his contribution to the grammar and spelling revision of the manuscript.

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Author contributions to the study and manuscript preparation include the following. Conception and design: all authors; Drafting the article: all authors; Data collection: Saba Motta; Critically revising the article: all authors; Reviewed submitted version of manuscript: all authors; Approved the final version of the manuscript on behalf of all authors: Boris Tufegdzic; Study supervision: Boris Tufegdzic.

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Correspondence to Boris Tufegdzic.

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The proposed systematic review does not require ethical approval, as it is conducted at the study level and does not involve individual patient-level data. Results will be disseminated by data sharing via academically established means, presentation at local and national scientific meetings and publication as a peer-reviewed manuscript.

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Tufegdzic, B., Lobo, F., Achi, E. et al. Alternative sensor montage for Index based EEG monitoring. A systematic review. J Clin Monit Comput (2024). https://doi.org/10.1007/s10877-024-01162-1

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