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Yang L, Xiong R, Chen X, Wang S, Yu D. The influence of dexmedetomidine added to ropivacaine for transversus abdominis plane block on perioperative neurocognitive disorders after radical colorectal cancer surgery: randomized, double-blind, controlled trial. BMC Anesthesiol 2024; 24:186. [PMID: 38796412 PMCID: PMC11127451 DOI: 10.1186/s12871-024-02569-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 05/17/2024] [Indexed: 05/28/2024] Open
Abstract
OBJECTIVE Perioperative Neurocognitive Disorders (PND) is a common neurological complication after radical colorectal cancer surgery, which increases adverse outcomes. So, our objective is to explore the influence of dexmedetomidine added to ropivacaine for transversus abdominis plane block (TAPB) on perioperative neurocognitive disorders, and to provide a new way to reduce the incidence of PND. METHODS One hundred and eighty patients submitted to radical laparoscopic colorectal cancer surgery were randomly divided into Control group and Dex group. Ultrasound guided TAPB was performed after anesthesia induction: 0.5% ropivacaine 20 ml was injected into each transversus abdominis plane in Control group, 0.5% ropivacaine + 1 μg/kg dexmedetomidine (amounting to 20 ml) in Dex group. We observed the incidence of PND within 30 days after surgery. RESULTS One hundred and sixty-nine cases were finally analyzed, including 84 cases in Control group and 85 cases in Dex group. Compared with Control group, there was no significant difference in terms of the incidence of PND on the 3rd day and the 7th day (P > 0.05), but the incidence significantly decreased at the 6th hour, at the 24th hour and on the 30th day after surgery (P < 0.05) in Dex group. CONCLUSION Dexmedetomidine added to ropivacaine for TAPB can reduce the incidence of PND in the first 24 h after surgery and on the 30th postoperative day, which may be related to reduce the consumption of general anesthetics and provide satisfactory postoperative analgesia. TRIAL REGISTRATION 29 /05/ 2021, ChiCTR2100046876.
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Affiliation(s)
- Li Yang
- Department of Anesthesiology, The Second People's Hospital of Yibin, Yibin, China
- Clinical Research and Translational Center, Second People's Hospital of Yibin City-West China Yibin Hospital, Sichuan University, Yibin, China
| | - RongFei Xiong
- Department of Rehabilitation Medicine, The Second People's Hospital of Yibin, Yibin, China
| | - XingQu Chen
- Department of Anesthesiology, The Second People's Hospital of Yibin, Yibin, China
- Clinical Research and Translational Center, Second People's Hospital of Yibin City-West China Yibin Hospital, Sichuan University, Yibin, China
| | - Shu Wang
- Department of Anesthesiology, The Second People's Hospital of Yibin, Yibin, China
- Clinical Research and Translational Center, Second People's Hospital of Yibin City-West China Yibin Hospital, Sichuan University, Yibin, China
| | - DeShui Yu
- Department of Anesthesiology, The Second People's Hospital of Yibin, Yibin, China.
- Clinical Research and Translational Center, Second People's Hospital of Yibin City-West China Yibin Hospital, Sichuan University, Yibin, China.
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Nam S, Yoo S, Park SK, Kim Y, Kim JT. Relationship between preinduction electroencephalogram patterns and propofol sensitivity in adult patients. J Clin Monit Comput 2024:10.1007/s10877-024-01149-y. [PMID: 38561555 DOI: 10.1007/s10877-024-01149-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 03/05/2024] [Indexed: 04/04/2024]
Abstract
PURPOSE To determine the precise induction dose, an objective assessment of individual propofol sensitivity is necessary. This study aimed to investigate whether preinduction electroencephalogram (EEG) data are useful in determining the optimal propofol dose for the induction of general anesthesia in healthy adult patients. METHODS Seventy healthy adult patients underwent total intravenous anesthesia (TIVA), and the effect-site target concentration of propofol was observed to measure each individual's propofol requirements for loss of responsiveness. We analyzed preinduction EEG data to assess its relationship with propofol requirements and conducted multiple regression analyses considering various patient-related factors. RESULTS Patients with higher relative delta power (ρ = 0.47, p < 0.01) and higher absolute delta power (ρ = 0.34, p = 0.01) required a greater amount of propofol for anesthesia induction. In contrast, patients with higher relative beta power (ρ = -0.33, p < 0.01) required less propofol to achieve unresponsiveness. Multiple regression analysis revealed an independent association between relative delta power and propofol requirements. CONCLUSION Preinduction EEG, particularly relative delta power, is associated with propofol requirements during the induction of general anesthesia. The utilization of preinduction EEG data may improve the precision of induction dose selection for individuals.
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Affiliation(s)
- Seungpyo Nam
- Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seokha Yoo
- Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Sun-Kyung Park
- Department of Anesthesiology and Pain Medicine and Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Youngwon Kim
- Department of Anesthesiology and Pain Medicine and Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Jin-Tae Kim
- Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea.
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Lin HT, Lin CM, Wu YY, Chang WH, Wei KC, Chen YC, Chen PY, Liu FC, Chen KT. Predictors for delayed awakening in adult glioma patients receiving awake craniotomy under monitored anesthesia care. J Neurooncol 2023; 165:361-372. [PMID: 37917280 PMCID: PMC10689299 DOI: 10.1007/s11060-023-04494-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 10/30/2023] [Indexed: 11/04/2023]
Abstract
PURPOSE Delayed awakening after anesthetic discontinuation during awake craniotomy is associated with somnolence during functional brain mapping. However, predictors of delayed awakening in patients receiving monitored anesthesia care for awake craniotomy are unknown. METHODS This retrospective cohort study analyzed 117 adult patients with supratentorial glioma in or near eloquent areas who received monitored anesthesia care for awake craniotomy between July 2020 and January 2023 at Linkou Chang Gung Memorial Hospital. These patients were divided into two groups according to their time to awakening (ability to speak their names) after propofol cessation: longer or shorter than 20 min (median duration). Because propofol was solely used anesthetic from skin incision to dural opening, parameters in Schnider model for propofol target-controlled infusion, such as age, sex, and BMI, were adjusted or propensity-matched to compare their anesthetic, surgical, and histopathological profiles. RESULTS After propensity-matched comparisons of age and BMI, significant predictors of delayed awakening included IDH1 wild-type tumors and repeated craniotomies. Subgroup analysis revealed that older age and larger T2 volume were predictors in patients undergoing the first craniotomy, while lower preoperative Karnofsky performance scale scores and depression were predictors in repeated craniotomy cases. Delayed awakening was also associated with somnolence and a lower gross total resection rate. CONCLUSION Our retrospective analysis of patients receiving monitored anesthesia care for awake craniotomy revealed that delayed awakening after propofol discontinuation occurred more often in patients with IDH1 wild-type tumors and repeated craniotomies. Also, delayed awakening was associated with somnolence during functional mapping and a lower gross total resection rate.
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Affiliation(s)
- Huan-Tang Lin
- Department of Anesthesiology, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan, 333, Taiwan
| | - Chun-Ming Lin
- Department of Anesthesiology, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
| | - Yah-Yuan Wu
- Department of Neurology, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
| | - Wei-Han Chang
- Department of Physical Medicine & Rehabilitation, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
| | - Kuo-Chen Wei
- Department of Neurosurgery, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, 5 Fu-Shin Street, Kwei-Shan, Taoyuan, 333, Taiwan
- Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan
| | - Yi-Chun Chen
- Department of Neurology, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
| | - Pin-Yuan Chen
- Department of Neurosurgery, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, 5 Fu-Shin Street, Kwei-Shan, Taoyuan, 333, Taiwan
| | - Fu-Chao Liu
- Department of Anesthesiology, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
| | - Ko-Ting Chen
- Department of Neurosurgery, College of Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University, 5 Fu-Shin Street, Kwei-Shan, Taoyuan, 333, Taiwan.
- Neuroscience Research Center, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan.
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Linassi F, Kreuzer M, Kratzer S, Olivieri S, Zanatta P, Schneider G, Carron M. Unwanted spontaneous responsiveness and burst suppression in patients undergoing entropy-guided total intravenous anesthesia with target-controlled infusion: An observational prospective trial. J Clin Anesth 2023; 86:111045. [PMID: 36680980 DOI: 10.1016/j.jclinane.2022.111045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 11/14/2022] [Accepted: 12/19/2022] [Indexed: 01/21/2023]
Abstract
STUDY OBJECTIVE To estimate the incidence of unwanted spontaneous responsiveness and burst suppression (BSupp) in patients undergoing state entropy (SE) and surgical pleth index (SPI)-guided total intravenous anesthesia (TIVA) with target-controlled infusion (TCI). DESIGN Observational, prospective, single-center study. SETTINGS Operating room. PATIENTS 107 adult (<65 years) and elderly (≥65 years) women undergoing breast surgery. INTERVENTIONS Propofol-remifentanil TIVA-TCI-guided by SE for depth of anesthesia monitoring (target value 40-60) and SPI for antinociception monitoring (target value 20-50) without neuromuscular blockade. MEASUREMENTS Age; body mass index; American Society of Anesthesiologists physical status classification; concentration at the effect site of propofol (CeP) and remifentanil (CeR) at loss of responsiveness (LoR), median during anesthesia maintenance (MdM), and at return of responsiveness (RoR); propofol infusion duration; incidence of postoperative delirium (POD) with Confusing Assessment Method for the Intensive Care Unit. MAIN RESULTS During SE-SPI-guided TIVA-TCI, 13.1% of patients showed unwanted spontaneous responsiveness, whereas 45.8% showed BSupp. Unwanted spontaneous responsiveness was observed mainly in adults (p < 0.05), and higher CeP RoR (p < 0.05) was registered. BSupp was observed mainly in patients showing a lower CeP MdM (p < 0.01) and CeP RoR (p < 0.05). Unwanted spontaneous responsiveness and BSupp were not associated with significant differences in CeRs. An age-related hysteresis effect was observed, resulting in higher CeP LoR than CeP RoR (p < 0.001). 12.2% of patients showed POD. Only preoperative serum albumin was associated with increased likelihood of POD (p = 0.046). CONCLUSIONS The SE-SPI-guided TIVA-TCI did not prevent unwanted spontaneous responsiveness and BSupp. CeP RoR may be used as a proxy for anesthetic sensitivity.
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Affiliation(s)
- Federico Linassi
- Department of Pharmaceutical and Pharmacological Sciences, Università degli Studi di Padova, via Marzolo 5, 35131, Padova, Italy; Department of Anesthesiology and Critical Care, Treviso Regional Hospital AULSS 2 Marca Trevigiana, Piazzale Ospedale 1, Treviso 31100, Italy.
| | - Matthias Kreuzer
- Department of Anesthesiology and Intensive Care, Klinikum rechts der Isar, Technical University of Munich, School of Medicine, Ismaninger Str. 22, München 81675, Germany
| | - Stephan Kratzer
- Department of Anesthesiology and Intensive Care, Klinikum rechts der Isar, Technical University of Munich, School of Medicine, Ismaninger Str. 22, München 81675, Germany
| | - Sara Olivieri
- Department of Anesthesiology and Critical Care, Treviso Regional Hospital AULSS 2 Marca Trevigiana, Piazzale Ospedale 1, Treviso 31100, Italy
| | - Paolo Zanatta
- Department of Anesthesia and Intensive Care, Integrated University Hospital of Verona, Piazzale Aristide Stefani 1, Verona 37121, Italy
| | - Gerhard Schneider
- Department of Anesthesiology and Intensive Care, Klinikum rechts der Isar, Technical University of Munich, School of Medicine, Ismaninger Str. 22, München 81675, Germany
| | - Michele Carron
- Department of Medicine-DIMED, Section of Anesthesiology and Intensive Care, University of Padova, Padova, Italy
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Touchard C, Cartailler J, Levé C, Serrano J, Sabbagh D, Manquat E, Joachim J, Mateo J, Gayat E, Engemann D, Vallée F. Propofol Requirement and EEG Alpha Band Power During General Anesthesia Provide Complementary Views on Preoperative Cognitive Decline. Front Aging Neurosci 2020; 12:593320. [PMID: 33328973 PMCID: PMC7729157 DOI: 10.3389/fnagi.2020.593320] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 11/05/2020] [Indexed: 11/15/2022] Open
Abstract
Background: Although cognitive decline (CD) is associated with increased post-operative morbidity and mortality, routinely screening patients remains difficult. The main objective of this prospective study is to use the EEG response to a Propofol-based general anesthesia (GA) to reveal CD. Methods: 42 patients with collected EEG and Propofol target concentration infusion (TCI) during GA had a preoperative cognitive assessment using MoCA. We evaluated the performance of three variables to detect CD (MoCA < 25 points): age, Propofol requirement to induce unconsciousness (TCI at SEF95: 8–13 Hz) and the frontal alpha band power (AP at SEF95: 8–13 Hz). Results: The 17 patients (40%) with CD were significantly older (p < 0.001), had lower TCI (p < 0.001), and AP (p < 0.001). We found using logistic models that TCI and AP were the best set of variables associated with CD (AUC: 0.89) and performed better than age (p < 0.05). Propofol TCI had a greater impact on CD probability compared to AP, although both were complementary in detecting CD. Conclusion: TCI and AP contribute additively to reveal patient with preoperative cognitive decline. Further research on post-operative cognitive trajectory are necessary to confirm the interest of intra operative variables in addition or as a substitute to cognitive evaluation.
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Affiliation(s)
- Cyril Touchard
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France
| | - Jérôme Cartailler
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France.,Inserm, UMRS-942, Paris Diderot University, Paris, France
| | - Charlotte Levé
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France
| | - José Serrano
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France
| | - David Sabbagh
- Université Paris-Saclay, Inria, CEA Palaiseau, France
| | - Elsa Manquat
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France
| | - Jona Joachim
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France
| | - Joaquim Mateo
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France
| | - Etienne Gayat
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France.,Inserm, UMRS-942, Paris Diderot University, Paris, France
| | - Denis Engemann
- Université Paris-Saclay, Inria, CEA Palaiseau, France.,Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
| | - Fabrice Vallée
- Department of Anesthesiology and Intensive Care, Lariboisière - Saint Louis Hospitals, Paris, France.,Inserm, UMRS-942, Paris Diderot University, Paris, France.,Université Paris-Saclay, Inria, CEA Palaiseau, France
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Zhang Y, Wang Y, Yan F, Song D, Wang H, Wang Q, Huang L. Influence of pre-anesthesia dynamic frontal-parietal communication on individual susceptibility to propofol. Clin Neurophysiol 2020; 131:2566-2577. [PMID: 32927212 DOI: 10.1016/j.clinph.2020.07.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 06/16/2020] [Accepted: 07/09/2020] [Indexed: 12/21/2022]
Abstract
OBJECTIVE We investigated whether pre-anesthesia dynamic frontal-parietal functional connectivity was correlated with the observed interindividual differences in propofol susceptibility. METHODS Three resting-state EEG datasets were used in the study (N = 29, N = 21 and N = 20). We estimated the pre-anesthesia strength and fluctuations of frontal-parietal functional connectivity by using sliding-window analysis. Propofol served as the sole anesthetic drug, and it was administered by using a target-controlled infusion system. Individual susceptibility to propofol was assessed by the induction time, from infusion onset until a bispectral index value of 60 was reached, for subjects in dataset-1 and dataset-2, and susceptibility was assessed by behavioral data for subjects in the external dataset. RESULTS We observed in the three datasets that subjects with high susceptibility to propofol had lower pre-anesthesia strength and lower fluctuation of frontal-parietal functional connectivity than the low-susceptibility group at alpha band. Moreover, the induction time was significantly correlated with the estimated pre-anesthesia frontal-parietal functional connectivity measures. We also validated the robustness of these findings by using different window lengths in sliding-window analysis. CONCLUSIONS Subjects with weaker pre-anesthesia dynamic frontal-parietal communication are more likely to be anesthetized. SIGNIFICANCE These observations suggest that the titration procedure for propofol should consider the pre-anesthesia brain functional state.
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Affiliation(s)
- Yun Zhang
- School of Life Science and Technology, Xidian University, Xi'an, China
| | - Yubo Wang
- School of Life Science and Technology, Xidian University, Xi'an, China
| | - Fei Yan
- Department of Anesthesiology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Dawei Song
- Department of Anesthesiology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Haidong Wang
- School of Life Science and Technology, Xidian University, Xi'an, China
| | - Qiang Wang
- Department of Anesthesiology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
| | - Liyu Huang
- School of Life Science and Technology, Xidian University, Xi'an, China.
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Age progression from vicenarians (20-29 year) to nonagenarians (90-99 year) among a population pharmacokinetic/pharmacodynamic (PopPk-PD) covariate analysis of propofol-bispectral index (BIS) electroencephalography. J Pharmacokinet Pharmacodyn 2020; 47:145-161. [PMID: 32100175 DOI: 10.1007/s10928-020-09678-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 02/03/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND Pharmacokinetic/pharmacodynamic (PK/PD) modeling has made an enormous contribution to intravenous anesthesia. Because of their altered physiological, pharmacological and pathological aspects, titrating general anesthesia in the elderly is a challenging task. METHODS Eighty patients were consecutively enrolled divided by decades from vicenarians (20-29 year) to nonagenarians (90-99 year) into eight groups. Using target controlled infusion (TCI) and electroencephalographic (EEG)-derived bispectral index (BIS) we set propofol plasma concentration (Cp) to gradually reach 3.5 μg mL-1 over 3.5-min. In each patient, we constructed a PK/PD model and conducted a population PK/PD (PopPK-PD) covariate analysis. RESULTS Age was significant covariate for baseline BIS effect (E0), inhibitory propofol concentration at 50% BIS decline (IC50) and maximum BIS decline (Emax). First-order rate constant Ke0 of 0.47 min-1 in vicenarians (20-29 year) gradually increased with age-progression to 1.85 min-1 in nonagenarians (90-99 year). Simulation modelling showed that clinically recommended Cp of 3.5 μg mL-1 for 20-29 year BIS 50 should be reduced to 3.0 for 30-49 year, 2.5 for 50-69 year and 2.0 for 80-89 year. CONCLUSION We quantified and graded EEG-BIS age-progression among different age groups divided by decades. We demonstrated deeper BIS values with decades' age progression. Our data has important implications for propofol dosing. The practical information for physicians in their daily clinical practice is using propofol Cp of 3.5 μg mL-1 might not yield BIS value of 50 in elderly patients. Our simulations showed that the recommended regimen of Cp 3.5 μg mL-1 for 20-29 year should be gradually decreased to 2.0 μg mL-1 for 80-89 year. CLINICAL TRIAL REGISTRY NUMBERS European Community Clinical Trials Database EudraCT (http://eudract.emea.eu) initial trial registration number: 2011-002847-81, and subsequently registered at www.clinicaltrials.gov; trial registration number: NCT02585284. Xijing Hospital of Fourth Military Medical University ethics committee approval number 20110707-4.
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[Intern(euron)al affairs : The role of specific neocortical interneuron classes in the interaction between acetylcholine and GABAergic anesthetics]. Anaesthesist 2016; 65:609-14. [PMID: 27380048 DOI: 10.1007/s00101-016-0197-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Acetylcholine is a neuromodulator which is released throughout the central nervous system and plays an essential role in consciousness and cognitive processes including attention and learning. Due to its 'activating' effect on the neuronal and behavioral level its interaction with anesthetics has long been of interest to anesthesiologists. It is widely held that a reduction of the release of acetylcholine by general anesthetics constitutes part of the anesthetic effect. This notion is backed by numerous human and animal studies, but is also in seeming contradiction to findings that acetylcholine activates specific classes of inhibitory neurons: if acetylcholine excites elements within the neuronal network responsible for the release of the inhibitory neurotransmitter γ-aminobutyric acid (GABA), its withdrawal should diminish, not enhance, the effect of anesthetics.Focusing on cortical circuits, we present an overview of recent advances in cellular neurophysiology, particularly the interactions between inhibitory neuron classes, which provide insights on the interaction between acetylcholine and GABA.
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Depth of anesthesia causality dilemmas: the next generation. Can J Anaesth 2015; 63:142-7. [DOI: 10.1007/s12630-015-0489-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 09/10/2015] [Indexed: 10/23/2022] Open
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Stuart-Smith K. Hemiarthroplasty performed under transversus abdominis plane block in a patient with severe cardiorespiratory disease. Anaesthesia 2012; 68:417-20. [DOI: 10.1111/anae.12108] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/05/2012] [Indexed: 11/30/2022]
Affiliation(s)
- K. Stuart-Smith
- Department of Anaesthesia; Christchurch Hospital; Christchurch New Zealand
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Sepúlveda Voullieme PO, Abadía LL. [Total intravenous anaesthesia in geriatrics: the example of propofol]. REVISTA ESPANOLA DE ANESTESIOLOGIA Y REANIMACION 2012; 60:327-35. [PMID: 23218760 DOI: 10.1016/j.redar.2012.09.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Accepted: 09/20/2012] [Indexed: 02/05/2023]
Abstract
The aim of this review is to analyse the changes in the pharmacology of the elderly patient using, as examples, the existing pharmacokinetics and pharmacodynamics models of propofol and data provided in the literature.
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Affiliation(s)
- P O Sepúlveda Voullieme
- Servicio de Anestesiología, Facultad de Medicina, Clínica Alemana-Universidad del Desarrollo, Santiago, Chile.
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Sepúlveda PO, Mora X. [Reevaluation of the time course of the effect of propofol described with the Schnider pharmacokinetic model]. ACTA ACUST UNITED AC 2012; 59:542-8. [PMID: 23040653 DOI: 10.1016/j.redar.2012.07.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Accepted: 07/24/2012] [Indexed: 11/18/2022]
Abstract
BACKGROUND The first order plasma-effect-site equilibration rate constant (k(e0)) links the pharmacokinetics (PK) and pharmacodynamics (PD) of a given drug. This constant, calculated for each specific PK drug model, allowed us to predict the course of the effect in a target controlled infusion (TCI). The PK-PD model of propofol, published by Schnider et al., calculated a k(e0) value of 0.456min(-1) and a corresponding time to peak effect (t peak) of 1.6min. The aim of this study was to reevaluate the k(e0) value for the predicted Schnider model of propofol, with data from a complete effect curve obtained by monitoring the bispectral index (BIS). METHODS The study included 35 healthy adult patients (18-90 years) scheduled for elective surgery with standard monitoring and using the BIS XP(®) (Aspect), and who received a propofol infusion to reach a plasma target of 12 μg/ml in 4min. The infusion was then stopped, obtaining a complete effect curve when the patient woke up. The Anestfusor™ (University of Chile) software was used to control the infusion pumps, calculate the plasma concentration plotted by Schnider PK model, and to store the BIS data every second. Loss (LOC) and recovery (ROC) of consciousness was assessed and recorded. Using a traditional parametric method using the "k(e0) Objective function" of the PK-PD tools for Excel, the individual and population k(e0) was calculated. Predictive Smith tests (Pk) and Student t test were used for statistical analysis. A P<.05 indicated significance. RESULTS The evaluation included 21 male and 14 female patients (18 to 90 years). We obtained 1,001 (±182) EEG data and the corresponding calculated plasma concentration for each case. The population k(e0) obtained was 0.144min(-1) (SD±0.048), very different from the original model (P<.001). This value corresponds with a t peak of 2.45min. The predictive performance (Pk) for the new model was 0.9 (SD±0.03), but only 0.78 (SD±0.06) for the original (P<.001). With a baseline BIS of 95.8 (SD±2.34), the BIS at LOC was 77.48 (SD±9.6) and 74.65(SD±6.3) at ROC (P=.027). The calculated Ce in the original model at LOC and ROC were 5.9 (SD±1.35)/1.08 μg/ml (SD±0.32) (P<.001), respectively, and 2.3 (SD±0.63)/2.0 μg/ml (SD±0.65) (NS) for the new model. The values between LOC/ROC were significantly different between the 2 models (P<.001). No differences in k(e0) value were found between males and females, but in the new model the k(e0) was affected by age as a covariable (0.26-[age×0.0022]) (P<.05). CONCLUSIONS The dynamic relationship between propofol plasma concentrations predicted by Schnider's pharmacokinetic model and its hypnotic effect measured with BIS was better characterized with a smaller k(e0) value (slower t½k(e0)) than that present in the original model, with an age effect also not described before.
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Affiliation(s)
- P O Sepúlveda
- Universidad del Desarrollo, Santiago de Chile, Chile.
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[Postoperative cognitive dysfunction (POCD): strategy of prevention, assessment and management]. ACTA ACUST UNITED AC 2011; 30:e49-53. [PMID: 21945705 DOI: 10.1016/j.annfar.2011.08.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The femoral neck fracture is a major cause of morbidity and mortality in the elderly. The etiology of cognitive impairment observed in this population of aged patient seems to be multifactorial. In the strategy of prevention, elderly patient must have the clearer information dealing with the postoperative cognitive dysfunction. This would reduce the incidence of POCD and some cognitive complaints, which often reflect the anxiety of the elderly patient facing the possibility of cognitive impairment. During the anaesthesia consultation, it seems important to assess the cognitive function of this elderly patient (like using neuropsycholgical scale as the MMSE) and to identify associated risk factors of cognitive dysfunction. The management of cognitive disorders should be multidisciplinary, the anesthesiologist being the main referent, in collaboration with the geriatrician and the surgeon. In the clinical setting of femoral neck fracture in the elderly, this multimodal management (pain, nutrition, functional rehabilitation to make these patients autonomous as quickly as possible), seems to improve the functional prognosis and to have the observed POCD decreased.
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