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Liu T, Wu G, Wang W, Qi H, Zhao S, Zhang J, Wang R, Yuan T, Xiao L, Luo Z, Yang W, Wang F, Wang G, Yan L. Utility of somatosensory- and motor-evoked potential change thresholds in surgical treatment for thoracic spinal stenosis based on different pathologies. Spine J 2024:S1529-9430(24)00198-0. [PMID: 38685275 DOI: 10.1016/j.spinee.2024.04.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 03/26/2024] [Accepted: 04/23/2024] [Indexed: 05/02/2024]
Abstract
BACKGROUND CONTEXT Thoracic spinal stenosis (TSS) is secondary to different pathologies that differ in clinical characteristics and surgical outcomes. PURPOSE This study aimed to determine the optimal warning thresholds for combined somatosensory-evoked potentials (SSEP) and motor-evoked potentials (MEP) for predicting postoperative neurological deterioration in surgical treatment for TSS based on different pathologies. Additionally, we explored the correlation between SSEP/MEP monitoring and postoperative spinal neurological function. STUDY SETTING Retrospective study. PATIENT SAMPLE Two hundred and five patients. OUTCOME MEASURES We obtained perioperative modified Japanese Orthopedic Association (mJOA) scores to assess spinal neurological function. METHODS The data collected in this study included demographic data, intraoperative neurophysiological monitoring (IONM) signals, and perioperative neurological function assessments. To determine the optimal IONM warning threshold, a receiver operating characteristic (ROC) curve was used. Additionally, Pearson correlation analysis was conducted to determine the correlation between IONM signals and clinical neurological conditions. RESULTS A total of 205 consecutive patients were eligible. Forty-one patients had thoracic disc herniation (TDH), 14 had ossification of the posterior longitudinal ligament (OPLL), 124 had ossification of the ligamentum flavum (OLF), and 26 had OPLL+OLF. The mean mJOA scores before surgery and 3 months after surgery were 7.0 and 7.9, respectively, resulting in a mean mJOA recovery rate (RR) of 23.1%. The average postoperative mJOA RRs for patients with TDH, OPLL, OLF, and OPLL+OLF were 24.8%, 10.4%, 26.8%, and 11.2%, respectively. Patients with OPLL+OLF exhibited a more stringent threshold for IONM changes. This included a lower amplitude cutoff value (a decrease of 49.0% in the SSEP amplitude and 57.5% in the MEP amplitude for short-term prediction) and a shorter duration of waveform change (19.5 minutes for SSEP and 22.5 minutes for MEP for short-term prediction). On the other hand, patients with TDH had more lenient IONM warning criteria (a decrease of 49.0% in SSEP amplitude and 77.5% in MEP amplitude for short-term prediction; durations of change of 25.5 minutes for SSEP and 32.5 minutes for MEP). However, OPLL patients or OLF patients had moderate and similar IONM warning thresholds. Additionally, there was a stronger correlation between the SSEP amplitude variability ratio and the JOA RR in OPLL+OLF patients, while the correlation was stronger between the MEP amplitude variability ratio and the JOA RR for the other three TSS pathologies. CONCLUSIONS Optimal IONM change criteria for prediction vary depending on different TSS pathologies. The optimal monitoring strategy for prediction varies depending on TSS pathologies.
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Affiliation(s)
- Tun Liu
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Gang Wu
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Wentao Wang
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Huaguang Qi
- Department of Functional Inspection Section, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Songchuan Zhao
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Jitao Zhang
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Ruiguo Wang
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Tao Yuan
- Department of Functional Inspection Section, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Li Xiao
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Zhenguo Luo
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Weizhou Yang
- Department of Spine Surgery, the first affiliated hospital of Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Fei Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Gang Wang
- The Key Laboratory of Biomedical Information Engineering, Ministry of Education, Institute of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - Liang Yan
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China.
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Nunn KP, Velazquez AA, Bebawy JF, Ma K, Sinedino BE, Goel A, Pereira SM. Perioperative Methadone for Spine Surgery: A Scoping Review. J Neurosurg Anesthesiol 2024:00008506-990000000-00106. [PMID: 38624227 DOI: 10.1097/ana.0000000000000966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 03/08/2024] [Indexed: 04/17/2024]
Abstract
Complex spine surgery is associated with significant acute postoperative pain. Methadone possesses pharmacological properties that make it an attractive analgesic modality for major surgeries. This scoping review aimed to summarize the evidence for the perioperative use of methadone in adults undergoing complex spine surgery. The review was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR). A search was performed using MEDLINE, CINAHL, Cochrane Library, Scopus, Embase, and Joanna Briggs between January 1946 and April 2023. The initial search identified 317 citations, of which 12 met the criteria for inclusion in the review. There was significant heterogeneity in the doses, routes of administration, and timing of perioperative methadone administration in the included studies. On the basis of the available literature, methadone has been associated with reduced postoperative pain scores and reduced postoperative opioid consumption. Though safety concerns have been raised by observational studies, these have not been confirmed by prospective randomized studies. Further research is required to explore optimal methadone dosing regimens, the potential synergistic relationships between methadone and other pharmacological adjuncts, as well as the potential long-term antinociceptive benefits of perioperative methadone administration.
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Affiliation(s)
- Kieran P Nunn
- Department of Anesthesiology and Pain Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada
| | - Ahida A Velazquez
- Department of Anesthesiology and Pain Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada
| | - John F Bebawy
- Anesthesiology & Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL
| | - Kan Ma
- Department of Anesthesiology and Pain Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada
| | - Bruno Erick Sinedino
- Discipline of Anesthesiology, Department of Surgery, Faculty of Medicine, University of São Paulo, São Paulo, Brazil
| | - Akash Goel
- Department of Anesthesiology and Pain Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada
| | - Sergio M Pereira
- Department of Anesthesiology and Pain Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada
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Liu T, Qin Y, Qi H, Luo Z, Yan L, Yu P, Dong B, Zhao S, Wu X, Chang Z, Liu Z, Liu X, Yuan T, Li H, Xiao L, Wang G. A Loading Dose of Dexmedetomidine With Constant Infusion Inhibits Intraoperative Neuromonitoring During Thoracic Spinal Decompression Surgery: A Randomized Prospective Study. Front Pharmacol 2022; 13:840320. [PMID: 35330828 PMCID: PMC8940210 DOI: 10.3389/fphar.2022.840320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 01/27/2022] [Indexed: 11/13/2022] Open
Abstract
Background: The effect of a bolus dose of dexmedetomidine on intraoperative neuromonitoring (IONM) parameters during spinal surgeries has been variably reported and remains a debated topic. Methods: A randomized, double-blinded, placebo-controlled study was performed to assess the effect of dexmedetomidine (1 μg/kg in 10 min) followed by a constant infusion rate on IONM during thoracic spinal decompression surgery (TSDS). A total of 165 patients were enrolled and randomized into three groups. One group received propofol- and remifentanil-based total intravenous anesthesia (TIVA) (T group), one group received TIVA combined with dexmedetomidine at a constant infusion rate (0.5 μg kg−1 h−1) (D1 group), and one group received TIVA combined with dexmedetomidine delivered in a loading dose (1 μg kg−1 in 10 min) followed by a constant infusion rate (0.5 μg kg−1 h−1) (D2 group). The IONM data recorded before test drug administration was defined as the baseline value. We aimed at comparing the parameters of IONM. Results: In the D2 group, within-group analysis showed suppressive effects on IONM parameters compared with baseline value after a bolus dose of dexmedetomidine. Furthermore, the D2 group also showed inhibitory effects on IONM recordings compared with both the D1 group and the T group, including a statistically significant decrease in SSEP amplitude and MEP amplitude, and an increase in SSEP latency. No significance was found in IONM parameters between the T group and the D1 group. Conclusion: Dexmedetomidine delivered in a loading dose can significantly inhibit IONM parameters in TSDS. Special attention should be paid to the timing of a bolus dose of dexmedetomidine under IONM. However, dexmedetomidine delivered at a constant speed does not exert inhibitory effects on IONM data.
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Affiliation(s)
- Tun Liu
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Yue Qin
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Huaguang Qi
- Department of Functional Inspection Section, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Zhenguo Luo
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Liang Yan
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Pengfei Yu
- Department of Gastrointestinal Surgery, Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Buhuai Dong
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Songchuan Zhao
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Xucai Wu
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Zhen Chang
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Zhian Liu
- The Key Laboratory of Biomedical Information Engineering, Ministry of Education, School of Life Science and Technology, Institute of Biomedical Engineering, Xi'an Jiaotong University, Xi'an, China
| | - Xuemei Liu
- Department of Functional Inspection Section, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Tao Yuan
- Department of Functional Inspection Section, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Houkun Li
- Department of Spine Surgery, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Li Xiao
- Department of Anesthesiology, Xi'an Honghui Hospital, Xi'an Jiaotong University Health Science Center, Xi'an, China
| | - Gang Wang
- The Key Laboratory of Biomedical Information Engineering, Ministry of Education, School of Life Science and Technology, Institute of Biomedical Engineering, Xi'an Jiaotong University, Xi'an, China
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The effect of dexmedetomidine on motor-evoked potentials during pediatric posterior spinal fusion surgery: a retrospective case-control study. Can J Anaesth 2020; 67:1341-1348. [PMID: 32700209 DOI: 10.1007/s12630-020-01758-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 04/18/2020] [Accepted: 04/19/2020] [Indexed: 10/23/2022] Open
Abstract
PURPOSE Motor-evoked potentials (MEPs) are frequently used in pediatric posterior spinal fusion surgery (PSFS) to detect spinal cord ischemia. Dexmedetomidine is increasingly being used as an adjunct to total intravenous anesthesia, but its effect on MEP amplitude has been variably reported. The purpose of this study was to evaluate the effect of an infusion of dexmedetomidine on the amplitude of MEPs. METHODS We performed a retrospective case-control study of 30 pediatric patients who received a 0.5 µg·kg-1·hr-1 infusion of dexmedetomidine, ten patients who received 0.3 µg·kg-1·hr-1 dexmedetomidine, and 30 control patients who did not receive dexmedetomidine during PSFS. Two neurophysiologists reviewed the MEP amplitudes in six muscle groups at three time points: when the patient was turned prone (baseline; T1), one hour after incision (T2), and after exposure of the spine but before insertion of the first screw (T3). RESULTS In all muscles tested, the mean MEP amplitude was reduced by T3 when dexmedetomidine was infused at 0.5 µg·kg-1·hr-1. The greatest reduction from baseline MEP amplitude was 829 µV (95% confidence interval, 352 to 1230; P < 0.001) seen in first right dorsus interosseous. When dexmedetomidine was infused at 0.3 µg·kg-1·hr-1, there was a significant reduction in MEP amplitude in four of the six muscles tested at T3 compared with the control group. CONCLUSIONS Dexmedetomidine at commonly used infusion rates of 0.3 µg·kg-1·hr-1 or 0.5 µg·kg-1·hr-1 causes a significant decrease in MEP amplitude during pediatric PSFS. We suggest that dexmedetomidine should be avoided in children undergoing PSFS so as not to confuse the interpretation of this important neurophysiological monitor.
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Aldana E, Álvarez López-Herrero N, Benito H, Colomina MJ, Fernández-Candil J, García-Orellana M, Guzmán B, Ingelmo I, Iturri F, Martín Huerta B, León A, Pérez-Lorensu PJ, Valencia L, Valverde JL. Consensus document for multimodal intraoperatory neurophisiological monitoring in neurosurgical procedures. Basic fundamentals. ACTA ACUST UNITED AC 2020; 68:82-98. [PMID: 32624233 DOI: 10.1016/j.redar.2020.02.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 02/04/2020] [Accepted: 02/18/2020] [Indexed: 01/27/2023]
Abstract
The present work aims to establish a guide to action, agreed by anaesthesiologists and neurophysiologists alike, to perform effective intraoperative neurophysiological monitoring for procedures presenting a risk of functional neurological injury, and neurosurgical procedures. The first section discusses the main techniques currently used for intraoperative neurophysiological monitoring. The second exposes the anaesthetic and non-anaesthetic factors that are likely to affect the electrical records of the nervous system structures. This section is followed by an analysis detailing the adverse effects associated with the most common techniques and their use. Finally, the last section describes a series of guidelines to be followed upon the various intraoperative clinical events.
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Affiliation(s)
- E Aldana
- Anestesiología y Reanimación, Hospital Vithas Xanit Internacional, Benalmádena, Málaga, España
| | - N Álvarez López-Herrero
- Neurofisiología, Servicio de Neurocirugía, Hospital de la Santa Creu i Sant Pau, Barcelona, España
| | - H Benito
- Anestesiología y Reanimación, Hospital Clínico Universitario Lozano Blesa, Zaragoza, España
| | - M J Colomina
- Anestesiología y Reanimación, Hospital Universitari Bellvitge, L'Hospitalet de Llobregat, Universitat de Barcelona, Barcelona, España
| | | | - M García-Orellana
- Anestesiología y Reanimación, Hospital Clínic de Barcelona, Barcelona, España
| | - B Guzmán
- Neurofisiología clínica, Hospital Clínico Universitario Lozano de Blesa, Zaragoza, España
| | - I Ingelmo
- Anestesiología y Reanimación, Hospital Universitario Ramón y Cajal, Madrid, España
| | - F Iturri
- Anestesiología y Reanimación, Hospital Universitario de Cruces, Baracaldo, Vizcaya, España
| | - B Martín Huerta
- Anestesiología y Reanimación, Hospital de la Santa Creu i Sant Pau, Barcelona, España
| | - A León
- Neurofisiología, Servicio de Neurología, Parc de Salut Mar, Barcelona, España
| | - P J Pérez-Lorensu
- Neurofisiología Clínica, Unidad de Monitorización Neurofisiológica Intraoperatoria, Hospital Universitario de Canarias, Tenerife, España
| | - L Valencia
- Anestesiología y Reanimación, Hospital Universitario de Gran Canaria Dr. Negrín, Las Palmas de Gran Canaria, España
| | - J L Valverde
- Anestesiología y Reanimación, Hospital Vithas Xanit Internacional, Benalmádena, Málaga, España
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Hasan MS, Tan JK, Chan CYW, Kwan MK, Karim FSA, Goh KJ. Comparison between effect of desflurane/remifentanil and propofol/remifentanil anesthesia on somatosensory evoked potential monitoring during scoliosis surgery-A randomized controlled trial. J Orthop Surg (Hong Kong) 2019; 26:2309499018789529. [PMID: 30058437 DOI: 10.1177/2309499018789529] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Drugs used in anesthesia can affect somatosensory evoked potential (SSEP) monitoring, which is used routinely for intraoperative monitoring of spinal cord integrity during spinal surgery. OBJECTIVE The objective of this study was to determine whether combined total intravenous anesthesia (TIVA) technique with propofol/remifentanil is associated with less SSEP suppression when compared to combined volatile agent desflurane/remifentanil anesthesia during corrective scoliosis surgery at a comparable depth of anesthesia. DESIGN It is a randomized controlled trial. SETTING The study was conducted at the Single tertiary University Hospital during October 2014 to June 2015. PATIENTS Patients who required SSEP and had no neurological deficits, and were of American Society of Anesthesiologist I and II physical status, were included. Patients who had sensory or motor deficits preoperatively and significant cardiovascular and respiratory disease were excluded. A total of 72 patients were screened, and 67 patients were randomized and allocated to two groups: 34 in desflurane/remifentanil group and 33 in TIVA group. Four patients from desflurane/remifentanil group and three from TIVA group were withdrawn due to decrease in SSEP amplitude to <0.3 µV after induction of anesthesia. Thirty patients from each group were analyzed. INTERVENTIONS Sixty-seven patients were randomized to receive TIVA or desflurane/remifentanil anesthesia. MAIN OUTCOME MEASURES The measurements taken were the amplitude and latency of SSEP monitoring at five different time points during surgery: before and after the induction of anesthesia, at skin incision, at pedicle screw insertion, and at rod insertion. RESULTS Both anesthesia techniques, TIVA and desflurane/remifentanil, resulted in decreased amplitude and increased latencies of both cervical and cortical peaks. The desflurane/remifentanil group had a significantly greater reduction in the amplitude ( p = 0.004) and an increase in latency ( p = 0.002) of P40 compared with the TIVA group. However, there were no differences in both amplitude ( p = 0.214) and latency ( p = 0.16) in cervical SSEP between the two groups. CONCLUSIONS Compared with TIVA technique, desflurane/remifentanil anesthesia caused more suppression in cortical SSEP, but not in cervical SSEP, at a comparable depth of anesthesia.
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Affiliation(s)
- M Shahnaz Hasan
- 1 Department of Anesthesiology, University of Malaya, Kuala Lumpur, Malaysia
| | - Jin-Keat Tan
- 1 Department of Anesthesiology, University of Malaya, Kuala Lumpur, Malaysia
| | - Chris Yin Wei Chan
- 2 Department of Orthopaedic Surgery, University of Malaya, Kuala Lumpur, Malaysia
| | - Mun Keong Kwan
- 2 Department of Orthopaedic Surgery, University of Malaya, Kuala Lumpur, Malaysia
| | | | - Khean-Jin Goh
- 3 Division of Neurology, University of Malaya, Kuala Lumpur, Malaysia
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The Intraoperative Effect of Methadone on Somatosensory Evoked Potentials. J Neurosurg Anesthesiol 2017; 29:168-174. [DOI: 10.1097/ana.0000000000000265] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Li Y, Meng L, Peng Y, Qiao H, Guo L, Han R, Gelb AW. Effects of Dexmedetomidine on motor- and somatosensory-evoked potentials in patients with thoracic spinal cord tumor: a randomized controlled trial. BMC Anesthesiol 2016; 16:51. [PMID: 27484701 PMCID: PMC4970285 DOI: 10.1186/s12871-016-0217-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2015] [Accepted: 07/21/2016] [Indexed: 12/14/2022] Open
Abstract
Background We hypothesized that the addition of dexmedetomidine in a clinically relevant dose to propofol-remifentanil anesthesia regimen does not exert an adverse effect on motor-evoked potentials (MEP) and somatosensory-evoked potentials (SSEP) in adult patients undergoing thoracic spinal cord tumor resection. Methods Seventy-one adult patients were randomized into three groups. Propofol group (n = 25): propofol-remifentanil regimenand the dosage was adjusted to maintain the bispectral index (BIS) between 40 and 50. DP adjusted group (n = 23): Dexmedetomidine (0.5 μg/kg loading dose infused over 10 min followed by a constant infusion of 0.5 μg/kg/h) was added to the propofol-remifentanil regimen and propofol was adjusted to maintain BIS between 40 and 50. DP unadjusted group (n = 23): Dexmedetomidine (administer as DP adjusted group) was added to the propofol-remifentanil regimen and propofol was not adjusted. All patients received MEP, SSEP and BIS monitoring. Results There were no significant changes in the amplitude and latency of MEP and SSEP among different groups (P > 0.05). The estimated propofol plasma concentration in DP adjusted group (2.7 ± 0.3 μg/ml) was significantly lower than in propofol group (3.1 ± 0.2 μg/ml) and DP unadjusted group (3.1 ± 0.2 μg/ml) (P = 0.000). BIS in DP unadjusted group (35 ± 5) was significantly lower than in propofol group (44 ± 3) (P = 0.000). Conclusions The addition of dexmedetomidine to propofol-remifentanil regimen does not exert an adverse effect on MEP and SSEP monitoring in adult patients undergoing thoracic spinal cord tumor resection. Trial registration The study was registered with the Chinese Clinical Trial Registry on January 31st, 2014. The reference number was ChiCTR-TRC-14004229.
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Affiliation(s)
- Yan Li
- Department of Anesthesiology, Beijing Tiantan Hospital, Capital Medical University, No. 6 Tiantan Xili, Dongcheng District, Beijing, China, 100050
| | - Lingzhong Meng
- Departments of Anesthesia and Perioperative Care, University of California San Francisco, San Francisco, CA, USA
| | - Yuming Peng
- Department of Anesthesiology, Beijing Tiantan Hospital, Capital Medical University, No. 6 Tiantan Xili, Dongcheng District, Beijing, China, 100050
| | - Hui Qiao
- Neurophysiological Monitoring, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Lanjun Guo
- Neurosurgery/Neurophysiological Monitoring Service, University of California San Francisco, San Francisco, CA, USA
| | - Ruquan Han
- Department of Anesthesiology, Beijing Tiantan Hospital, Capital Medical University, No. 6 Tiantan Xili, Dongcheng District, Beijing, China, 100050.
| | - Adrian W Gelb
- Departments of Anesthesia and Perioperative Care, University of California San Francisco, San Francisco, CA, USA
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Banoczi W. Update on Anesthetic and Metabolic Effects During Intraoperative Neurophysiological Monitoring (IONM). ACTA ACUST UNITED AC 2015. [DOI: 10.1080/1086508x.2005.11079540] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Walt Banoczi
- Neurodiagnostic Technology Program Orange Coast College Costa Mesa, California
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Subramanian A, Wanta BT, Fogelson JL, Curry TB, Hannon JD. Time to extubation during propofol anesthesia for spine surgery with sufentanil compared with fentanyl: a retrospective cohort study. Spine (Phila Pa 1976) 2014; 39:1758-64. [PMID: 25010093 DOI: 10.1097/brs.0000000000000509] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Retrospective cohort study. OBJECTIVE This study compares time to extubation between major spine surgery patients anesthetized with fentanyl versus sufentanil infusions in combination with propofol. SUMMARY OF BACKGROUND DATA In patients undergoing spinal fusion with intraoperative electrophysiological monitoring of the spinal cord, total intravenous anesthesia with a propofol/opioid combination results in better electrophysiological signals compared with volatile anesthetics. Pharmacokinetic data suggest that total intravenous anesthesia with sufentanil should lead to more rapid emergence from anesthesia than with fentanyl. However, this has never been tested in the spine surgery patient population. METHODS With institutional review board approval, all major spine patients receiving a propofol-based total intravenous anesthesia with fentanyl were compared with those receiving sufentanil. Time to extubation, defined as the time from surgical closure to tracheal extubation, was the study outcome. Relevant demographic, anthropomorphic, anesthetic, and surgical data were collected. Association between type of opioid and time to extubation was tested for statistical significance. Multiple linear regression analysis was used to control for confounders. RESULTS A total of 167 patients met inclusion criteria (fentanyl = 72, sufentanil = 95). There was no statistically significant difference between the 2 groups in terms of baseline characteristics. Time from surgical closure to extubation in the fentanyl versus sufentanil groups was not statistically different (mean [SD]: 40.2 [26.7] min vs. 45.0 [36.9] min; P = 0.36). On multivariate analysis, total dose of propofol and male sex were associated with increased time to extubation. CONCLUSION The use of sufentanil may not reduce time to extubation compared with fentanyl despite its favorable pharmacokinetic profile. Higher doses of propofol and male sex were associated with longer time to extubation and seem to play a greater role than choice of opioid. LEVEL OF EVIDENCE 3.
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Affiliation(s)
- Arun Subramanian
- Departments of *Anesthesiology and †Neurosurgery, Mayo Clinic Rochester, Rochester, MN
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Hadi BA, Al Ramadani R, Daas R, Naylor I, Zelko R, Saleh M. The influence of anaesthetic drug selection for scoliosis surgery on the management of intraoperative haemodynamic stability and postoperative pain—pharmaceutical care programme. SOUTHERN AFRICAN JOURNAL OF ANAESTHESIA AND ANALGESIA 2014. [DOI: 10.1080/22201173.2009.10872617] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abstract
During the last 30 years intraoperative electrophysiological monitoring (IOEM) has gained increasing importance in monitoring the function of neuronal structures and the intraoperative detection of impending new neurological deficits. The use of IOEM could reduce the incidence of postoperative neurological deficits after various surgical procedures. Motor evoked potentials (MEP) seem to be superior to other methods for many indications regarding monitoring of the central nervous system. During the application of IOEM general anesthesia should be provided by total intravenous anesthesia with propofol with an emphasis on a continuous high opioid dosage. When intraoperative MEP or electromyography guidance is planned, muscle relaxation must be either completely omitted or maintained in a titrated dose range in a steady state. The IOEM can be performed by surgeons, neurologists and neurophysiologists or increasingly more by anesthesiologists. However, to guarantee a safe application and interpretation, sufficient knowledge of the effects of the surgical procedure and pharmacological and physiological influences on the neurophysiological findings are indispensable.
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13
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Krayenbühl N, Sarnthein J, Oinas M, Erdem E, Krisht AF. MRI-validation of SEP monitoring for ischemic events during microsurgical clipping of intracranial aneurysms. Clin Neurophysiol 2011; 122:1878-82. [PMID: 21377924 DOI: 10.1016/j.clinph.2011.02.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Revised: 12/20/2010] [Accepted: 02/08/2011] [Indexed: 11/28/2022]
Abstract
OBJECTIVE During surgical clipping of intracranial aneurysms, reduction in SEP amplitude is thought to indicate cortical ischemia and subsequent neurological deficits. Since the sensitivity of SEP is questioned, we investigated SEP with respect to post-operative ischemia. METHODS In 36 patients with 51 intracranial aneurysms, clinical evaluation and diffusion-weighted MRI (DWI) was performed before and within 24h after surgery. During surgery, time of temporary occlusion was recorded. MRI images were reviewed for signs of ischemia. RESULTS For 43 clip applications (84%), we observed neither pathologic SEP events nor ischemia in MRI. In two cases where reduction lasted >10 min after clip release, SEP events correlated with ischemia in the MRI. Only one of the ischemic patients was symptomatic and developed a transient hemiparesis. CONCLUSIONS While pathologic SEP events correlated with visible ischemia in MRI only in two cases with late SEP recovery, ischemia in MRI may have been transient or may not have reached detection threshold in the other cases, in agreement with the absence of permanent neurological deficits. SIGNIFICANCE In complex aneurysm cases, where prolonged temporary occlusion is expected, SEP should be used to detect ischemia at a reversible stage to improve the safety of aneurysm clipping.
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Affiliation(s)
- Niklaus Krayenbühl
- Department of Neurosurgery, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
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14
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Abdel Hamid AM, Abo Shady AF, Abdel Azeem ES. Remifentanil infusion as a modality for opioid-based anaesthesia in paediatric practice. Indian J Anaesth 2010; 54:318-23. [PMID: 20882174 PMCID: PMC2943701 DOI: 10.4103/0019-5049.68375] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
This study was designed to compare the intra-operative and post-operative analgesic requirements and side effects of using fentanyl infusion versus remifentanil infusion during short-duration surgical procedures in children. The study comprised of 40 children randomly allocated into two equal groups: fentanyl (F-group) or remifentanil (R-group). Both were administered a continuous intravenous (i.v.) infusion. Anaesthetic recovery was assessed using the Brussels sedation scale every 5 min from the time of entry till discharge from recovery room. Post-operative analgesia was assessed throughout the first three post-operative (PO) hours using observational pain–discomfort scale (OPS) and adverse events were recorded. Haemodynamic variables showed a non-significant difference between both the groups. Patients who received remifentanil showed significantly shorter time to spontaneous respiration, eye opening, extubation and verbalization compared to those who received fentanyl. Discharge time was significantly shorter in R-group, and 18 patients fulfilled criteria for recovery-room discharge at ≤25 min with a significant difference in favour of remifentanil. Fentanyl provided significantly better PO analgesia than remifentanil and children in F-group showed a significantly lower mean cumulative OPS record than those in R-group; however, the number of patients requiring rescue analgesia did not show a significant difference between both the groups. Two cases in F-group and one in R-group had bradycardia, one case in R-group had mild hypotension and PO vomiting had occurred in three patients in the F-group and two patients in the R-group. In conclusion, remifentanil is appropriate for opioid-based anaesthesia for paediatric patients as it provides haemodynamic stability and rapid recovery with minimal post-operative side effects.
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15
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Asouhidou I, Katsaridis V, Vaidis G, Ioannou P, Givissis P, Christodoulou A, Georgiadis G. Somatosensory Evoked Potentials suppression due to remifentanil during spinal operations; a prospective clinical study. SCOLIOSIS 2010; 5:8. [PMID: 20462433 PMCID: PMC2876141 DOI: 10.1186/1748-7161-5-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2010] [Accepted: 05/12/2010] [Indexed: 11/10/2022]
Abstract
BACKGROUND Somatosensory evoked potentials (SSEP) are being used for the investigation and monitoring of the integrity of neural pathways during surgical procedures. Intraoperative neurophysiologic monitoring is affected by the type of anesthetic agents. Remifentanil is supposed to produce minimal or no changes in SSEP amplitude and latency. This study aims to investigate whether high doses of remifentanil influence the SSEP during spinal surgery under total intravenous anesthesia. METHODS Ten patients underwent spinal surgery. Anesthesia was induced with propofol (2 mg/Kg), fentanyl (2 mcg/Kg) and a single dose of cis-atracurium (0.15 mg/Kg), followed by infusion of 0.8 mcg/kg/min of remifentanil and propofol (30-50 mcg/kg/min). The depth of anesthesia was monitored by Bispectral Index (BIS) and an adequate level (40-50) of anesthesia was maintained. Somatosensory evoked potentials (SSEPs) were recorded intraoperatively from the tibial nerve (P37) 15 min before initiation of remifentanil infusion. Data were analysed over that period. RESULTS Remifentanil induced prolongation of the tibial SSEP latency which however was not significant (p > 0.05). The suppression of the amplitude was significant (p < 0.001), varying from 20-80% with this decrease being time related. CONCLUSION Remifentanil in high doses induces significant changes in SSEP components that should be taken under consideration during intraoperative neuromonitoring.
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Affiliation(s)
- Irene Asouhidou
- 2nd Department of Anesthesiology "G,Papanikolaou" General Hospital, Exohi Thessaloniki, Greece.
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16
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Fung NY, Hu Y, Irwin MG, Chow BFM, Yuen MY. Comparison between Sevoflurane/Remifentanil and Propofol/Remifentanil Anaesthesia in Providing Conditions for Somatosensory Evoked Potential Monitoring during Scoliosis Corrective Surgery. Anaesth Intensive Care 2008; 36:779-85. [DOI: 10.1177/0310057x0803600605] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Somatosensory evoked potential (SSEP) monitoring is an important tool in spinal corrective surgery. Anaesthesia has a significant influence on SSEP monitoring and a technique which has the least and shortest suppressant effect on SSEP while facilitating a fast recovery from anaesthesia is ideal. We compared the effect of sevoflurane/remifentanil and propofol/remifentanil anaesthesia on SSEPs during scoliosis corrective surgery and assessed patients’ clinical recovery profiles. Twenty patients with idiopathic scoliosis receiving surgical correction with intraoperative SSEP monitoring were prospectively randomised to receive sevoflurane/remifentanil anaesthesia or propofol/remifentanil anaesthesia. During surgery, changes in anaesthesia dose and physiological variables were recorded, while SSEP was continuously monitored. A simulated ‘wake-up’ test was performed postoperatively to assess speed and quality of recovery from anaesthesia. The effects of propofol and sevoflurane resulted in SSEP amplitude variability between 18.0% ± 3.5% to 28.7% ± 5.9% and SSEP latency variability within 1.3% ± 0.4% to 2.6% ± 1.2%. Patients receiving sevoflurane had faster suppression and faster recovery of SSEP amplitude compared to propofol (P <0.05), although propofol anaesthesia showed less within-patient variability in Cz amplitude and latency (P <0.05). On cessation of anaesthesia, time to eye-opening (5.2 vs. 16.5 minutes) and toe movement (5.4 vs. 17.4 minutes) was shorter following sevoflurane (all P <0.05). These findings indicate that propofol produces a better SSEP signal than sevoflurane. However, adjustments in sevoflurane concentration result in faster changes in the SSEP signal than propofol. Assessment of neurological function was facilitated more rapidly after sevoflurane anaesthesia.
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Affiliation(s)
| | - Y. Hu
- Department of Orthopaedics and Traumatology
| | - M. G. Irwin
- Department of Anaesthesiology, The University of Hong Kong
| | | | - M. Y. Yuen
- Department of Anaesthesiology, Queen Mary Hospital
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17
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Hermanns H, Lipfert P, Meier S, Jetzek-Zader M, Krauspe R, Stevens MF. Cortical somatosensory-evoked potentials during spine surgery in patients with neuromuscular and idiopathic scoliosis under propofol–remifentanil anaesthesia. Br J Anaesth 2007; 98:362-5. [PMID: 17237215 DOI: 10.1093/bja/ael365] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Intraoperative monitoring of the spinal cord via cortical somatosensory-evoked potentials (SSEP) is a routine during spinal surgery. However, especially in neuromuscular scoliosis, the reliability of cortical SSEP has been questioned. Therefore, we compared the feasibility of cortical SSEP in idiopathic and neuromuscular scoliosis using anaesthetics known to have only minimal effect on SSEP recordings. METHODS Total intravenous anaesthesia with propofol and remifentanil as continuous infusion was standardized for all the patients. Median and tibial nerve cortical SSEP were monitored in 54 patients who underwent surgery for spinal deformity. Twenty-seven had idiopathic scoliosis and 27 had neuromuscular scoliosis. The portion of reproducible results and intraoperative changes were compared between the groups. RESULTS In both groups, cortical SSEP could be monitored with sufficient reliability. Only in two patients with idiopathic and four patients with neuromuscular scoliosis no reproducible traces could be obtained. The amplitudes in patients with neuromuscular scoliosis were lower than in those with idiopathic scoliosis, but not statistically significant. There were no postoperative neurological deficits. The number of false positive and true positive did not differ between the groups. CONCLUSIONS Assessment of cortical SSEP during spine surgery was equally effective and reliable in patients with neuromuscular scoliosis and in patients with idiopathic scoliosis, possibly as a result of propofol-remifentanil anaesthesia.
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Affiliation(s)
- H Hermanns
- Department of Anaesthesiology, University of Duesseldorf, Duesseldorf, Germany.
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18
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DiCindio S, Schwartz DM. Anesthetic Management for Pediatric Spinal Fusion: Implications of Advances in Spinal Cord Monitoring. ACTA ACUST UNITED AC 2005; 23:765-87, x. [PMID: 16310663 DOI: 10.1016/j.atc.2005.08.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Currently, the detection of emerging injury through intraoperative neurologic monitoring is the best way to prevent neurologic injury. This requires a team approach that includes the anesthesiologist, neurophysiologist, and surgeon. The monitoring modalities available for the patient must be considered in planning the anesthetic management. In addition, intraoperative care for the patient requires an ongoing attention to how the anesthetic drugs affect spinal cord monitoring.
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Affiliation(s)
- Sabina DiCindio
- Department of Anesthesiology, Alfred I. duPont Hospital for Children, Wilmington, DE 19899, USA.
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19
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Clapcich AJ, Emerson RG, Roye DP, Xie H, Gallo EJ, Dowling KC, Ramnath B, Heyer EJ. The effects of propofol, small-dose isoflurane, and nitrous oxide on cortical somatosensory evoked potential and bispectral index monitoring in adolescents undergoing spinal fusion. Anesth Analg 2004; 99:1334-1340. [PMID: 15502027 PMCID: PMC2435242 DOI: 10.1213/01.ane.0000134807.73615.5c] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In this study we compared the effects of propofol, small-dose isoflurane, and nitrous oxide (N(2)O) on cortical somatosensory evoked potentials (SSEP) and bispectral index (BIS) monitoring in adolescents undergoing spinal fusion. Twelve patients received the following anesthetic maintenance combinations in a randomly determined order: treatment #1: isoflurane 0.4% + N(2)O 70% + O(2) 30%; treatment #2: isoflurane 0.6% + N(2)O 70% + O(2) 30%; treatment #3: isoflurane 0.6% + air + O(2) 30%; treatment #4: propofol 120 microg . kg(-1) . min(-1) + air + O(2) 30%. Cortical SSEP amplitudes measured during anesthesia maintenance with treatment #3 (isoflurane 0.6%/air) were more than those measured during maintenance with treatment #1 (isoflurane 0.4%/N(2)O 70%) (P < 0.0001) and treatment #2 (isoflurane 0.6%/N(2)O 70%) (P < 0.0052). Cortical SSEP amplitudes measured during treatment #4 (propofol 120 microg . kg(-1) . min(-1)/air) were more than treatment #1 (isoflurane 0.4%/N(2)O 70%) (P < 0.0001), treatment #2 (Iso 0.6%/N(2)O 70%) (P < 0.0007), and treatment #3 (isoflurane 0.6%/air) (P < 0.0191). In addition, average BIS values measured during treatments 1, 2, 3 and 4 were 62, 62, 61, and 44 respectively. Only treatment #4 (propofol 120 microg . kg(-1) . min(-1)/air) uniformly maintained BIS values less than 60. Our study demonstrates that propofol better preserves cortical SSEP amplitude measurement and provides a deeper level of hypnosis as measured by BIS values than combinations of small-dose isoflurane/N(2)O or small-dose isoflurane alone.
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Affiliation(s)
- Anthony J. Clapcich
- Department of Anesthesiology, Children’s Hospital of New York, New York-Presbyterian Hospital, New York, New York
| | - Ronald G. Emerson
- Department of Neurology, Children’s Hospital of New York, New York-Presbyterian Hospital, New York, New York
| | - David P. Roye
- Department of Orthopaedics, Children’s Hospital of New York, New York-Presbyterian Hospital, New York, New York
| | - Hui Xie
- Department of Biostatistics, Children’s Hospital of New York, New York-Presbyterian Hospital, New York, New York
| | - Edward J. Gallo
- Department of Neurology, Children’s Hospital of New York, New York-Presbyterian Hospital, New York, New York
| | - Kathy C. Dowling
- Department of Neurology, Children’s Hospital of New York, New York-Presbyterian Hospital, New York, New York
| | - Brian Ramnath
- Department of Neurology, Children’s Hospital of New York, New York-Presbyterian Hospital, New York, New York
| | - Eric J. Heyer
- Department of Anesthesiology, Children’s Hospital of New York, New York-Presbyterian Hospital, New York, New York
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20
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Abstract
The spectrum of spinal surgery in adult life is considerable. Anaesthesia for major spinal surgery, such as spinal stabilization following trauma or neoplastic disease, or for correction of scoliosis, presents a number of challenges. The type of patients who would have been declined surgery 20 yr ago for medical reasons, are now being offered extensive procedures. They commonly have preoperative co-morbid conditions such as serious cardiovascular and respiratory impairment. Airway management may be difficult. Surgery imposes further stresses of significant blood loss, prolonged anaesthesia, and problematical postoperative pain management. The perioperative management of these patients is discussed. The advent of techniques to monitor spinal cord function has reduced postoperative neurological morbidity in these patients. The anaesthetist has an important role in facilitating these methods of monitoring.
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Affiliation(s)
- D A Raw
- University Department Anaesthesia, The Duncan Building, Daulby Street, Liverpool, L69 3GA, UK.
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21
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Logginidou HG, Li BH, Li DP, Lohmann JS, Schuler HG, DiVittore NA, Kreiser S, Cronin AJ. Propofol Suppresses the Cortical Somatosensory Evoked Potential in Rats. Anesth Analg 2003; 97:1784-1788. [PMID: 14633560 DOI: 10.1213/01.ane.0000090318.16879.a8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
UNLABELLED The dose-response curve for the effect of volatile anesthetics on the somatosensory evoked potential (SEP) is well described, but for propofol, the large dose segment of the curve is undefined. We describe the effect of increasing plasma concentrations of propofol on cortical SEPs in 18 rats. After surgical preparation under ketamine anesthesia, a remifentanil infusion was begun at 2.5, 5, or 10 microg x kg(-1) x min(-1). After 20 min, the propofol infusion was initiated at 20 mg x kg(-1) x h(-1) and was increased to 40, 60, and 80 mg x kg(-1) x h(-1) at 20-min intervals. SEP was recorded before remifentanil infusion, before propofol infusion rate changes, and 30 min after discontinuing propofol infusion. In six additional rats, the plasma concentrations of propofol after each 20-min infusion were measured using gas chromatography. Remifentanil did not have a significant effect, but propofol significantly depressed the SEP amplitude and prolonged the latency at infusion rates of 40 mg x kg(-1) x h(-1) and more. Propofol's effect was dose-dependent, but even at 80 mg x kg(-1) x h(-1) with an estimated plasma concentration of 31.6 +/- 3.4 microg/mL (10.8 50% effective concentration), a measurable response was present in 44.5% of rats. These results suggest that even at large doses, propofol and remifentanil provide adequate conditions for SEP monitoring. IMPLICATIONS Rats demonstrate dose-dependent somatosensory evoked potential (SEP) suppression with propofol but not with remifentanil. However, SEP suppression by 50% occurred only at large (1.5 EC(50)) concentrations of propofol, and a measurable SEP was present in 8 of 18 rats, even at 10.8 EC(50).
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Affiliation(s)
- Helene G Logginidou
- Department of Anesthesiology, Pennsylvania State University College of Medicine, Milton S. Hershey Medical Center
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22
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Li BH, Lohmann JS, Schuler HG, Cronin AJ. Preservation of the cortical somatosensory-evoked potential during dexmedetomidine infusion in rats. Anesth Analg 2003; 96:1155-1160. [PMID: 12651676 DOI: 10.1213/01.ane.0000053239.62623.32] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
UNLABELLED Successful somatosensory-evoked potential (SEP) monitoring has been performed during the administration of dexmedetomidine to patients, but a systematic investigation of the dose response of the SEP to dexmedetomidine has not been reported. In this study, we evaluated the effect of a range of dexmedetomidine doses on the cortical SEP in rats. Twelve rats were initially anesthetized with ketamine and the lungs were mechanically ventilated. Femoral arterial and venous catheters were placed. Anesthesia was maintained with constant infusions of remifentanil (5-15 microg. kg(-1). min(-1)) and vecuronium (56 microg. kg(-1). min(-1)). Dexmedetomidine was infused at 0.1, 0.25, 0.5, 1.0, and 2.0 microg. kg(-1). min(-1) in a stepwise manner with 10-min infusion periods at each step. In eight rats, an additional large-dose infusion of dexmedetomidine at 10 microg. kg(-1). min(-1) was administered for 30 min. The cortical SEPs were recorded after stimulation of the tibial nerve. At all infusion rates, there was a statistically insignificant increase in the SEP amplitude. Dexmedetomidine consistently increased the SEP latency, but these increases were not statistically significant. These data demonstrate that dexmedetomidine maintains technically adequate conditions for SEP monitoring in rats and provides support for future studies of the effect of dexmedetomidine on SEP monitoring in humans. IMPLICATIONS In rats, the administration of a wide range of infusion rates of dexmedetomidine did not significantly affect the somatosensory-evoked potential. These results suggest that dexmedetomidine might be a useful adjunctive drug in patients undergoing intraoperative somatosensory-evoked potential monitoring.
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Affiliation(s)
- Bai-Han Li
- Department of Anesthesiology, Pennsylvania State University College of Medicine, Milton S. Hershey Medical Center
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23
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Lentschener C, Ghimouz A, Bonnichon P, Pépion C, Gomola A, Ozier Y. Remifentanil-propofol vs. sufentanil-propofol: optimal combinations in clinical anesthesia. Acta Anaesthesiol Scand 2003; 47:84-9. [PMID: 12492803 DOI: 10.1034/j.1399-6576.2003.470115.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Two opioid regimens, computer-simulated to provide optimal general anesthesia in combination with propofol, were compared using clinical criteria. METHODS Fifty patients undergoing thyroid surgery were blindly, prospectively and randomly allocated to receive either (a) i.v. remifentanil (1.5 micro g kg-1, followed by 0.2 micro g kg-1 min-1) or (b) i.v. sufentanil (0.2 micro g kg-1 followed by 0.2 micro g kg-1 h-1). Remifentanil infusion was stopped at the last skin suture. Sufentanil infusion was stopped 30 min before the end of surgery. Intravenous propofol was titrated to keep BIS at 50+/-5. Remifentanil and sufentanil groups were compared with regards to (a) propofol delivery, (b) hemodynamic and recovery variables, and (c) effect-site propofol levels during a steady-state period for effect-site remifentanil and sufentanil levels. P<0.05 was significant. RESULTS Groups were similar in demographic data; types and durations of surgery; total propofol consumption; and response, extubation and emergence times. During the steady-state period for the opioid delivery, the remifentanil and sufentanil effect-site levels were 5.3 ng ml-1 and 0.18 ng ml-1, respectively (potency ratio=30). In both opioid groups, in accordance with previous computer-simulations, the effect-site propofol concentrations remained (a) within a narrow range unaffected by surgical stimuli, (b) significantly smaller in the remifentanil group than in the sufentanil group, but (c) smaller than expected from previous computer-simulations. More patients required ephedrine following induction of anesthesia in the remifentanil compared with the sufentanil group. CONCLUSIONS The present clinical trial conducted in thyroid surgery is consistent with previous computer-simulated opioid-propofol combinations with respect to intraoperative and recovery variables. Effect-site propofol ranges were, however, lower than expected.
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Affiliation(s)
- C Lentschener
- Department of Anesthesia and Intensive Care, Hôpital Cochin, Université René Descartes, Paris.
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24
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Debailleul AM, Bortlein ML, Touzet G, Krivosic-Horber R. [Anesthetic particularities of stereotaxic neurosurgery]. ANNALES FRANCAISES D'ANESTHESIE ET DE REANIMATION 2002; 21:170-8. [PMID: 11915477 DOI: 10.1016/s0750-7658(01)00504-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Functional neurosurgery procedures are long and specific. Cooperation of the patient may be necessary during surgery. The interference of anaesthetic agents with electrophysiological monitoring should be as little as possible. Local anaesthesia combined with intravenous sedation is often used, but general anaesthesia is more comfortable and secure. Since awakening during the procedure is generally planed, it has to be quick, reliable and of excellent quality. These requirements are fulfilled by the association of propofol by target-controlled infusion (TCI) and a continuous infusion of remifentanil.
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Affiliation(s)
- A M Debailleul
- Département d'anesthésie-réanimation chirurgicale 1, hôpital Roger Salengro, CHRU Lille, rue E. Laine, 59037 Lille, France.
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