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Mathur R, Meyfroidt G, Robba C, Stevens RD. Neuromonitoring in the ICU - what, how and why? Curr Opin Crit Care 2024; 30:99-105. [PMID: 38441121 DOI: 10.1097/mcc.0000000000001138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
PURPOSE OF REVIEW We selectively review emerging noninvasive neuromonitoring techniques and the evidence that supports their use in the ICU setting. The focus is on neuromonitoring research in patients with acute brain injury. RECENT FINDINGS Noninvasive intracranial pressure evaluation with optic nerve sheath diameter measurements, transcranial Doppler waveform analysis, or skull mechanical extensometer waveform recordings have potential safety and resource-intensity advantages when compared to standard invasive monitors, however each of these techniques has limitations. Quantitative electroencephalography can be applied for detection of cerebral ischemia and states of covert consciousness. Near-infrared spectroscopy may be leveraged for cerebral oxygenation and autoregulation computation. Automated quantitative pupillometry and heart rate variability analysis have been shown to have diagnostic and/or prognostic significance in selected subtypes of acute brain injury. Finally, artificial intelligence is likely to transform interpretation and deployment of neuromonitoring paradigms individually and when integrated in multimodal paradigms. SUMMARY The ability to detect brain dysfunction and injury in critically ill patients is being enriched thanks to remarkable advances in neuromonitoring data acquisition and analysis. Studies are needed to validate the accuracy and reliability of these new approaches, and their feasibility and implementation within existing intensive care workflows.
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Affiliation(s)
- Rohan Mathur
- Department of Anesthesiology & Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Geert Meyfroidt
- Department of Intensive Care Medicine, University Hospitals Leuven, Belgium and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Belgium
| | - Chiara Robba
- IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Dipartimento di Scienze Chirurgiche e Diagnostiche Integrate, Università degli Studi di Genova, Genova, Italy
| | - Robert D Stevens
- Department of Anesthesiology & Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore MD, USA
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Isik OG, Chauhan V, Ahmed MT, Chang BA, Cassim TZ, Graves MC, Rajan S, Garcia PS. Alternate Electrode Placements to Facilitate Frontal Electroencephalography Monitoring in Anesthetized and Critically Ill Patients. J Neurosurg Anesthesiol 2024:00008506-990000000-00098. [PMID: 38466565 DOI: 10.1097/ana.0000000000000955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Accepted: 12/19/2023] [Indexed: 03/13/2024]
Abstract
BACKGROUND Frontal electroencephalography (EEG) monitoring can be useful in guiding the titration of anesthetics, but it is not always feasible to place electrodes in the standard configuration in some circumstances, including during neurosurgery. This study compares 5 alternate configurations of the Masimo Sedline Sensor. METHODS Ten stably sedated patients in the intensive care unit were recruited. Frontal EEG was monitored in the standard configuration (bifrontal upright) and 5 alternate configurations: bifrontal inverse, infraorbital, lateral upright, lateral inverse, and semilateral. Average power spectral densities (PSDs) with 95% CIs in the alternate configurations were compared to PSDs in the standard configuration. Two-one-sided-testing with Wilcoxon signed-rank tests assessed equivalence in the spectral edge frequency (SEF-95), EEG power, and relative delta (0.5 to 3.5 Hz), alpha (8 to 12 Hz), and beta (20 to 30 Hz) power between each alternate and standard configurations. RESULTS After the removal of unanalyzable tracings, 7 patients were included for analysis in the infraorbital configuration and 9 in all other configurations. In the lateral upright and lateral inverse configurations, PSDs significantly differed from the standard configuration within the 15 to 20 Hz band. The greatest decrease in EEG power was in the lateral inverse configuration (median: -97 dB; IQR: -130, -62 dB). The largest change in frequency distribution of EEG power was in the infraorbital configuration; median SEF-95 change of -1.4 Hz (IQR: -2.8, 0.7 Hz), median relative delta power change of +7.3% (IQR: 1.4%, 7.9%), and median relative alpha power change of -0.6% (IQR: -5.7%, 0.0%). CONCLUSIONS These 5 alternate Sedline electrode configurations are suitable options for monitoring frontal EEG when the standard configuration is not possible.
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Affiliation(s)
- Oliver G Isik
- Department of Anesthesiology, Columbia University Vagelos College of Physicians & Surgeons, New York, NY
| | - Vikas Chauhan
- Department of Anesthesiology, Columbia University Vagelos College of Physicians & Surgeons, New York, NY
| | - Meah T Ahmed
- Medical School, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Brian A Chang
- Department of Anesthesiology, Columbia University Vagelos College of Physicians & Surgeons, New York, NY
| | - Tuan Z Cassim
- Department of Psychology, School of Social and Behavioral Science, University of Utah, Salt Lake City, UT
| | - Morgan C Graves
- Department of Anesthesiology, Columbia University Vagelos College of Physicians & Surgeons, New York, NY
| | - Shobana Rajan
- Department of Anesthesiology, Cleveland Clinic, Cleveland, OH
| | - Paul S Garcia
- Department of Anesthesiology, Columbia University Vagelos College of Physicians & Surgeons, New York, NY
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Sonneville R, Dangayach NS, Newcombe V. Neurological complications of critically ill COVID-19 patients. Curr Opin Crit Care 2023; 29:61-67. [PMID: 36880556 DOI: 10.1097/mcc.0000000000001029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
PURPOSE OF REVIEW COVID-19 and systemic critical illness are both associated with neurological complications. We provide an update on the diagnosis and critical care management of adult patients with neurological complications of COVID-19. RECENT FINDINGS Large prospective multicentre studies conducted in the adult population over the last 18 months improved current knowledge on severe neurological complications of COVID-19. In COVID-19 patients presenting with neurological symptoms, a multimodal diagnostic workup (including CSF analysis, brain MRI, and EEG) may identify different syndromes associated with distinct trajectories and outcomes. Acute encephalopathy, which represents the most common neurological presentation of COVID-19, is associated with hypoxemia, toxic/metabolic derangements, and systemic inflammation. Other less frequent complications include cerebrovascular events, acute inflammatory syndromes, and seizures, which may be linked to more complex pathophysiological processes. Neuroimaging findings include infarction, haemorrhagic stroke, encephalitis, microhaemorrhages and leukoencephalopathy. In the absence of structural brain injury, prolonged unconsciousness is usually fully reversible, warranting a cautious approach for prognostication. Advanced quantitative MRI may provide useful insights into the extent and pathophysiology of the consequences of COVID-19 infection including atrophy and functional imaging changes in the chronic phase. SUMMARY Our review highlights the importance of a multimodal approach for the accurate diagnosis and management of complications of COVID-19, both at the acute phase and in the long-term.
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Affiliation(s)
- Romain Sonneville
- Université Paris Cité, IAME, INSERM UMR1137
- AP-HP, Hôpital Bichat - Claude Bernard, Department of Intensive Care Medicine, F-75018 Paris, France
| | - Neha S Dangayach
- Neurocritical Care Division, Departments of Neurosurgery and Neurology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Virginia Newcombe
- University Division of Anaesthesia, Department of Medicine, University of Cambridge, United Kingdom
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Tobar E, Farías JI, Rojas V, Penna A, Egaña JI, Ponce D, Bravo D, Maldonado F, Gajardo A, Gutiérrez R. Electroencephalography spectral edge frequency and suppression rate-guided sedation in patients with COVID-19: A randomized controlled trial. Front Med (Lausanne) 2022; 9:1013430. [DOI: 10.3389/fmed.2022.1013430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Accepted: 10/07/2022] [Indexed: 11/06/2022] Open
Abstract
BackgroundSedation in coronavirus disease 2019 (COVID-19) patients has been identified as a major challenge. We aimed to investigate whether the use of a multiparameter electroencephalogram (EEG) protocol to guide sedation in COVID-19 patients would increase the 30-day mechanical ventilation-free days (VFD).MethodsWe conducted a double-blind randomized clinical trial. We included patients with severe pneumonia due to COVID-19 who required mechanical ventilation (MV) and deep sedation. We randomized to the control (n = 25) or multiparameter group (n = 25). Sedation in the intervention group was administered following the standard institutional protocols together with a flow chart designed to reduce the propofol administration dose if the EEG suppression rate was over 2% or the spectral edge frequency 95 (SEF95) was below 10 Hz. We performed an intention-to-treat analysis to evaluate our primary outcome (30-day VFD).ResultsThere was no difference in VFD at day 30 (median: 11 [IQR 0–20] days in the control group vs. 0 [IQR 0–21] days in the BIS multiparameter group, p = 0.87). Among secondary outcomes, we documented a 17% reduction in the total adjusted propofol administered during the first 5 days of the protocol [median: 2.3 (IQR 1.9–2.8) mg/k/h in the control group vs. 1.9(IQR 1.5–2.2) mg/k/h in the MP group, p = 0.005]. This was accompanied by a higher average BIS value in the intervention group throughout the treatment period.ConclusionA sedation protocol guided by multivariate EEG-derived parameters did not increase the 30-day VFD. However, the intervention led to a reduction in total propofol administration.
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Flinspach AN, Zinn S, Zacharowski K, Balaban Ü, Herrmann E, Adam EH. Electroencephalogram-Based Evaluation of Impaired Sedation in Patients with Moderate to Severe COVID-19 ARDS. J Clin Med 2022; 11:jcm11123494. [PMID: 35743572 PMCID: PMC9224742 DOI: 10.3390/jcm11123494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 06/02/2022] [Accepted: 06/10/2022] [Indexed: 02/01/2023] Open
Abstract
The sedation management of patients with severe COVID-19 is challenging. Processed electroencephalography (pEEG) has already been used for sedation management before COVID-19 in critical care, but its applicability in COVID-19 has not yet been investigated. We performed this prospective observational study to evaluate whether the patient sedation index (PSI) obtained via pEEG may adequately reflect sedation in ventilated COVID-19 patients. Statistical analysis was performed by linear regression analysis with mixed effects. We included data from 49 consecutive patients. None of the patients received neuromuscular blocking agents by the time of the measurement. The mean value of the PSI was 20 (±23). The suppression rate was determined to be 14% (±24%). A deep sedation equivalent to the Richmond Agitation and Sedation Scale of −3 to −4 (correlation expected PSI 25−50) in bedside examination was noted in 79.4% of the recordings. Linear regression analysis revealed a significant correlation between the sedative dosages of propofol, midazolam, clonidine, and sufentanil (p < 0.01) and the sedation index. Our results showed a distinct discrepancy between the RASS and the determined PSI. However, it remains unclear to what extent any discrepancy is due to the electrophysiological effects of neuroinflammation in terms of pEEG alteration, to the misinterpretation of spinal or vegetative reflexes during bedside evaluation, or to other causes.
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Affiliation(s)
- Armin Niklas Flinspach
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Goethe-University Frankfurt, Theodor-Stern Kai 7, 60590 Frankfurt, Germany; (S.Z.); (K.Z.); (E.H.A.)
- Correspondence: ; Tel.: +49-69-6301-5868
| | - Sebastian Zinn
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Goethe-University Frankfurt, Theodor-Stern Kai 7, 60590 Frankfurt, Germany; (S.Z.); (K.Z.); (E.H.A.)
| | - Kai Zacharowski
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Goethe-University Frankfurt, Theodor-Stern Kai 7, 60590 Frankfurt, Germany; (S.Z.); (K.Z.); (E.H.A.)
| | - Ümniye Balaban
- Department of Biostatistics and Mathematical Modelling, Goethe-University Frankfurt, Theodor-Stern Kai 7, 60590 Frankfurt, Germany; (Ü.B.); (E.H.)
| | - Eva Herrmann
- Department of Biostatistics and Mathematical Modelling, Goethe-University Frankfurt, Theodor-Stern Kai 7, 60590 Frankfurt, Germany; (Ü.B.); (E.H.)
| | - Elisabeth Hannah Adam
- Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Goethe-University Frankfurt, Theodor-Stern Kai 7, 60590 Frankfurt, Germany; (S.Z.); (K.Z.); (E.H.A.)
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Hanidziar D, Westover MB. Monitoring of sedation in mechanically ventilated patients using remote technology. Curr Opin Crit Care 2022; 28:360-366. [PMID: 35653256 PMCID: PMC9434805 DOI: 10.1097/mcc.0000000000000940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
PURPOSE OF REVIEW Two years of coronavirus disease 2019 (COVID-19) pandemic highlighted that excessive sedation in the ICU leading to coma and other adverse outcomes remains pervasive. There is a need to improve monitoring and management of sedation in mechanically ventilated patients. Remote technologies that are based on automated analysis of electroencephalogram (EEG) could enhance standard care and alert clinicians real-time when severe EEG suppression or other abnormal brain states are detected. RECENT FINDINGS High rates of drug-induced coma as well as delirium were found in several large cohorts of mechanically ventilated patients with COVID-19 pneumonia. In patients with acute respiratory distress syndrome, high doses of sedatives comparable to general anesthesia have been commonly administered without defined EEG endpoints. Continuous limited-channel EEG can reveal pathologic brain states such as burst suppression, that cannot be diagnosed by neurological examination alone. Recent studies documented that machine learning-based analysis of continuous EEG signal is feasible and that this approach can identify burst suppression as well as delirium with high specificity. SUMMARY Preventing oversedation in the ICU remains a challenge. Continuous monitoring of EEG activity, automated EEG analysis, and generation of alerts to clinicians may reduce drug-induced coma and potentially improve patient outcomes.
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Affiliation(s)
- Dusan Hanidziar
- Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Boston, MA
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Davey Z, Gupta PB, Li DR, Nayak RU, Govindarajan P. Rapid Response EEG: Current State and Future Directions. Curr Neurol Neurosci Rep 2022; 22:839-846. [PMID: 36434488 PMCID: PMC9702853 DOI: 10.1007/s11910-022-01243-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2022] [Indexed: 11/27/2022]
Abstract
PURPOSE OF REVIEW To critically appraise the literature on the application, methods, and advances in emergency electroencephalography (EEG). RECENT FINDINGS The development of rapid EEG (rEEG) technologies and other reduced montage approaches, along with advances in machine learning over the past decade, has increased the rate and access to EEG acquisition. These achievements have made EEG in the emergency setting a practical diagnostic technique for detecting seizures, suspected nonconvulsive status epilepticus (NCSE), altered mental status, stroke, and in the setting of sedation. Growing evidence supports using EEG to expedite medical decision-making in the setting of suspected acute neurological injury. This review covers approaches to acquiring EEG in the emergency setting in the adult and pediatric populations. We also cover the clinical impact of this data, the time associated with emergency EEG, and the costs of acquiring EEG in these settings. Finally, we discuss the advances in artificial intelligence for rapid electrophysiological interpretation.
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Affiliation(s)
- Zachary Davey
- grid.414467.40000 0001 0560 6544Department of Neurology, Walter Reed National Military Medical Center, Bethesda, MD USA
| | - Pranjal Bodh Gupta
- grid.240952.80000000087342732Department of Emergency Medicine, Stanford Medicine, Palo Alto, CA USA
| | - David R. Li
- grid.240952.80000000087342732Department of Emergency Medicine, Stanford Medicine, Palo Alto, CA USA
| | - Rahul Uday Nayak
- grid.240952.80000000087342732Department of Emergency Medicine, Stanford Medicine, Palo Alto, CA USA
| | - Prasanthi Govindarajan
- grid.240952.80000000087342732Department of Emergency Medicine, Stanford Medicine, Palo Alto, CA USA
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