Please use this identifier to cite or link to this item: https://doi.org/10.1053/j.jvca.2005.05.006
Title: Monitoring oxygenator expiratory isoflurane concentrations and the bispectral index to guide isoflurane requirements during cardiopulmonary bypass
Authors: Liu, E.H.C. 
Dhara, S.S.
Keywords: Anesthetic depth
Bispectral index
Cardiopulmonary bypass
Isoflurane
Monitoring
Issue Date: Aug-2005
Citation: Liu, E.H.C., Dhara, S.S. (2005-08). Monitoring oxygenator expiratory isoflurane concentrations and the bispectral index to guide isoflurane requirements during cardiopulmonary bypass. Journal of Cardiothoracic and Vascular Anesthesia 19 (4) : 485-487. ScholarBank@NUS Repository. https://doi.org/10.1053/j.jvca.2005.05.006
Abstract: Objective: The purpose of this study was to measure the changes in isoflurane requirements during the rewarming phase of cardiopulmonary bypass with moderate hypothermia. Design: An observational study. Setting: University hospital, single center. Participants: Forty patients undergoing elective coronary artery bypass surgery with cardiopulmonary bypass. Interventions: Isoflurane requirements were quantified by measuring the concentrations in the oxygenator expiratory gas. Anesthesia was guided by bispectral index monitoring. Measurements and Main Results: Isoflurane concentrations required to maintain the bispectral index between 40 and 50 during the rewarming phase of cardiopulmonary bypass were measured. There was a progressive increase in expiratory isoflurane requirements during rewarming from 30°C to 37°C, with a Pearson correlation coefficient of 0.78. There was a significant difference in the concentration required at 30°C (0.41% ± 0.14%) compared with 37°C (1.00% ± 0.12%). Conclusion: Isoflurane requirements are reduced during hypothermic cardiopulmonary bypass. Monitoring anesthetic concentrations in the oxygenator expiratory gas may be a useful adjunct to monitoring the depth of anesthesia. © 2005 Elsevier Inc. All rights reserved.
Source Title: Journal of Cardiothoracic and Vascular Anesthesia
URI: http://scholarbank.nus.edu.sg/handle/10635/130882
ISSN: 10530770
DOI: 10.1053/j.jvca.2005.05.006
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