Disclosures. Set up audience participation. Test question. Outline. Neuromonitoring What and When? IP for monitoring technology licensed to Medtronic
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1 Neuromonitoring What and When? Disclosures IP for monitoring technology licensed to Medtronic Ken Brady, MD Pediatrics, Anesthesia, Critical Care Texas Children s Hospital Baylor College of Medicine Set up audience participation Test question 1. Take out your silenced phone 2. Open a web browser 3. Go to: PollEv.com/kenbrady584 NIRS Fun with Beer Lambert Autoregulation Lassen s curves EEG Fourier Transforms!!! Outline Take your beta blockers and buckle in.
2 Religion, Politics, and Neuromonitoring Cochrane Database Review of Pulse Oximetry we found no evidence that pulse oximetry affects the outcome of anaesthesia for patients. a total of 22,992 participants had been allocated at random to be monitored or not monitored with a pulse oximeter. does not affect a person's cognitive function and does not reduce the risk of complications or of dying after anaesthesia. Pedersen: Pulse oximetry for perioperative monitoring. Cochrane Database of Systematic Reviews 2014 Pascal s Wager and Neuromonitoring
3 Part I: Reflectance NIRS Beer Lambert Law: brains in cuvettes? : Absorbance : light intensity : molar absorption coefficient : light pathlength : concentration ε Singh GP. Near-infrared spectroscopy-current status. J Neuroanaesthesiol Crit Care 2016;3, Suppl S1:66-9 Borrowing from the pulse oximeter CMRO2/CBF: Jugular Sat and NIRS Proprietary algorithms that use multiple wavelengths. Ratio of Oxy to deoxy hemoglobin can be estimated, cancelling unknowns for both. Validation of NIRS monitors has been done against jugular venous oxygen saturation. Pulse oximeter subtracts non pulsatile (venous) signal to report arterial sat. Cerebral oximeter reports all cerebral blood saturation (mostly venous) Ikeda et al. Anesthesia and analgesia What is a low Cerebral Oximetry?
4 Case: Cardiopulmonary Bypass A 70 year old woman is having an aortic valve replacement and 2 vessel CABG for symptomatic valve insufficiency and CAD. She had left unilateral moderate carotid stenosis (<50% occluded). She is monitored with NIRS at initiation of bypass. Baseline NIRS: R 65%; L 68% on 0.21 FiO 2 After starting bypass: R 42%, L 44% ABG: 7.35/37/150; Hb: 7.0; T: 35.9 C Pump flow 100% (2.4 L/m 2 ), ABP: 55 mmhg What is your intervention? What causes low cerebral oximetry? DO 2 = CBF x CaO 2 CBF = (ABP ICP) / CVR CaO 2 = (Hb x 1.39 xsao2) + (PaO2 x 0.003) Low CBF: Hypotension ICP Hypocarbia Low Oxygen Content Hypoxia Anemia High Extraction Hyperthermia Deschamps; Anesthes. 2016;124(4): Part II: The autoregulation curve
5 The goal of autoregulation monitoring The Cambridge Method NIRS Autoregulation Using PRx to find optimal pressure Optimal High Low Validated in animal models, replicated with modifications of NIRS Autoreg monitoring in adult CPB RCCT R01 funded (Charles Hogue PI year 8 of 10) Perfusionist to keep ABP>LLA vs standard Increase flows primary Vasoconstrictors secondary MRI data not yet available
6 Autoreg monitoring in adult CPB Autoreg monitoring in adult CPB Post op delerium Standardized confusion assessment tool 174 subjects 90 autoregulation 84 control 17% reduction p< % redacted 41.4% Safety monitoring data Control (n=140) Autoregulation (n=139) Stroke (in hospital) 4 5 Dialysis* 4 2 Renal Injury* 17 4 Sepsis* 7 0 Prolonged mechanical ventilation* 11 7 MSOF* 5 0 Single inotrope>24 hr Multiple inotrope>48 hr* 9 4 New IABP 12 9 Death (in hospital)* 9 2 Part III: EEG EEG Changes and Ischemia Comparing Anesthetic Depth and Ischemic EEGs Foreman B, Claassen J. Quantitative EEG for the detection of brain ischemia. Critical Care. 2012;16(2):216. doi: /cc Wildes TS, Winter AC, Maybrier HR, et al Protocol for the Electroencephalography Guidance of Anesthesia to Alleviate Geriatric Syndromes (ENGAGES) study: a pragmatic, randomised clinical trial
7 EEG 101: Greek waves The Secret in the Secret Sauce Wave Name Wave Frequency (Hz) Relevance to Anesthesia Slow <1 Increase in Amplitude Delta 1 4 during anesthesia Theta 5 8 Increase in Amplitude Alpha 9 12 during anesthesia Beta Decrease in Amplitude Gamma during anesthesia Unprocessed EEG Spectogram Spectral edge frequency Burst Suppression Ratio Bispectral Coherence Index Narcotrend Entropy Algorithm Requires a knowledge of all of the EEG waves, and how they change during anesthesia Shows waves as power, frequency and time. Shows exact frequencies of dominant waves. Facilitates pattern recognition, but still requires profound knowledge of EEG. The upper 95% frequency boundary of EEG wave power. Spectral edge decreases with Anesthesia The % time (or probability) that EEG activity is silent. Regression methods of selected EEG features correlated to observed states of patient arousal under anesthesia. Uses statistical classification of the awake state against visually categorized EEG recordings. Quantifies the degree of disorder in the EEG: more entropy is more arousal. The EEG spectogram What happens to the EEG under GA? Clinical Electroencephalography for Anesthesiologists:Part I: Background and Basic Signatures Anesthes Clinical Electroencephalography for Anesthesiologists:Part I: Background and Basic Signatures Anesthes Spectral edge decreases with propofol anesthesia Propofol light sedation Propofol deep sedation Clinical Electroencephalography for Anesthesiologists:Part I: Background and Basic Signatures Anesthes. 2015
8 Burst Suppression Ratio Clinical Electroencephalography for Anesthesiologists:Part I: Background and Basic Signatures Anesthes From: Clinical Electroencephalography for Anesthesiologists:Part I: Background and Basic Signatures Anesthes. 2015;123(4): doi: /aln Date of download: 1/22/2018 Copyright 2018 American Society of Anesthesiologists. All rights reserved. BIS and Pediatrics infant child Summary NIRS: take it to church or leave it at home Know how it works and how to respond to it. Autoreg: coming soon to an OR near you Can only do 1 thing: support ABP optimization EEG: a contentious topic Be careful with the confounders teen From: Correlation of bispectral index with end tidal sevoflurane concentration and age in infants and children Br J Anaesth. 2005;95(3): doi: /bja/aei19
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