VIMA. (Volatile Induction and Maintenance Anesthesia) How and Why. James H. Philip M.E.(E), M.D.
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1 VIMA (Volatile Induction and Maintenance Anesthesia) How and Why James H. Philip M.E.(E), M.D. Copyright , James H Philip, all rights reserved
2 VIMA (Volatile Induction and Maintenance Anesthesia) How and Why James H. Philip, M.E.(E.), M.D. Anesthesiologist and Director of Bioengineering, Brigham and Women's Hospital Associate Professor of Anaesthesia, Harvard Medical School Medical Liaison, Partners Biomedical Engineering
3 I will use Gas Man Info: gasmanweb.com
4 Three unique uses for Sevoflurane Almost unique Sevoflurane Sedation Sevoflurane for a difficult airway Sevoflurane Vital Capacity Induction
5 Sevoflurane Sedation 2 L/min FGF Sevoflurane 2% PO Oral Ibuprofen (Advil, Motrin) $0.50
6 Why do VCI? It works No need for other drugs IV Induction agent (Pent/Prop) Opioid Muscle relaxant (any NMB) Reversal agents for NMB
7 No relaxants No Propofol
8 No relaxants No Propofol No use
9 No relaxants No Propofol No use No waste
10 Why do VIMA? Inexpensive Satisfying to Patient Anesthesiologist Surgeon
11 How to do Volatile Induction
12 Premedication None, typically Anything, as required Try talking, first
13 Sedation possibility Propofol 10 mg BWH Pharmacy makes 10 ml syringes 2 ml syringes would be better
14 Volatile Induction Fast* Volatile agent alone, with or without nitrous oxide Deep breath 51 ± 4 seconds, 1-4 breaths 39 ± 3 seconds, if 1 breath * Philip BK, Lombard L, Calalang I, Philip J. Sevoflurane Vital Capacity Induction Compared with Propofol Intravenous Induction for Adult Ambulatory Anesthesia. Anesth & Analg 87:623-7, 1999.
15 2 minute Preparation Volatile Prime for anesthesia circuit Oxygen Prime for lungs Mental Prime for patient
16 Volatile Prime Goal Prime the circuit with 8% Sevoflurane 66-75% N 2 O
17 Semi-Closed Circuit Volatile Prime 8% Sevoflurane 1 L / min O 2 3 L / min N 2 O Prime for 2 minutes Same time as pre-oxygenation
18 Volatile Prime Required to provide sudden, large, controlled increase in inspired anesthetic concentration Inspired Control by any means is OK New machines and techniques may make this easier
19 How to do Volatile Prime
20 Volatile Prime Empty the circuit FGF = 0 - flows all off Open relief (APL, pop-off) valve Squeeze bag to empty circuit Attach mask Seal mask Glove, stopper, cork, plug, other
21 One way - seal mask with glove
22 Another way - seal mask and circuit with tightfiting occluder
23 Prime the Circuit Empty the circuit first FGF=0 Attach mask Seal mask Open APL valve fully Empty reservoir bag through APL
24 Prime the Circuit Empty the circuit first FGF=0 Attach mask Seal mask with glove Open APL valve fully Empty reservoir bag through APL Let reservoir bag fill
25 Normal flow in breathing circuit Flow goes forward In the direction of the valves Emptying and filling reservoir bag and lungs, alternately
26 Normal flow in the breathing circuit - Inspiration Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
27 Normal flow in the breathing circuit - Expiration Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
28 Priming the Circuit Flow goes backwards Blocked by each valve Filling the reservoir
29 Back-fill the breathing circuit (#1) Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
30 Back-fill the breathing circuit (#1) Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
31 Back-fill the breathing circuit (#1) Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
32 Empty the reservoir bag (#1) Exhaust Squeeze CO 2 Absorbant Sampled 200 ml/min Fresh
33 Fill the reservoir bag again (#2) Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
34 Empty the reservoir bag (#2) Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
35 Fill the reservoir bag again (#3) Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
36 Close the Exhaust Valve Exhaust CO 2 Absorbant Sampled 200 ml/min Fresh
37 Empty reservoir bag (#3) and fill the inspired limb Closed Exhaust CO 2 Squeeze Absorbant Sampled 200 ml/min Fresh
38 Empty reservoir bag (#3) and fill the inspired limb Closed Exhaust CO 2 Squeeze Absorbant Sampled 200 ml/min Fresh
39 Empty reservoir bag (#3) and fill the inspired limb Closed Exhaust CO 2 Squeeze Absorbant Sampled 200 ml/min Fresh
40 Empty reservoir bag (#3) and fill the inspired limb Closed Exhaust CO 2 Squeeze Absorbant Sampled 200 ml/min Fresh
41 Empty reservoir bag (#3) and fill the inspired limb Closed Exhaust CO 2 Squeeze Absorbant Sampled 200 ml/min Fresh
42 Open the Exhaust - Fill the Expired Limb (#3) CO 2 Release Absorbant Sampled 200 ml/min Fresh
43 Open the Exhaust - Fill the Expired Limb (#3) CO 2 Release Absorbant Sampled 200 ml/min Fresh
44 Remove Glove, Apply mask to patient (#4) Exhaust CO 2 Release Absorbant Sampled 200 ml/min Fresh Patient
45 Circuit is ready Gas Monitor shows Circuit is Ready
46 Circuit is ready Gas Monitor shows Circuit is Ready After third bag-fill
47 Sample to gas monitor Here is how to test when ckt is ready
48 Bag # Sample from Reservoir Bag Attachment
49 2 minute Preparation Volatile Prime for anesthesia circuit Oxygen Prime for lungs Mental Prime for patient
50 While priming circuit Preoxygenate
51 Simple Circuit
52 Simple parts
53 Simple parts Oxygen source Reservoir bag (with cut end) 15-22mm adapter Sampling (oxygenating) Elbow Mask
54 Option in some countries: SiBI Connector Facilitates pre-oxygenation during circuit prime We have some at BWH Skip the next 4 slides to skip this section
55 SiBI(TM) Connector
56 SiBI Close-up
57 November 4, 2001 SiBI
58 South Lake Regional Hosp Ont 01/22/02
59 Peak Inspired Agent Monitoring Some monitors report Inspired = Peak Inspired This is a problem if Mean and Peak differ Mean is representative of what affects uptake GE-Datex-Ohmeda ADU puts FGF after Insp Valve This makes Mean and Peak differ greatly
60 Normal Breathing Circuit FGF path CO 2 Absorbant E Most ADS I
61 GE ADU FGF path CO 2 Absorbant I,E ADU
62 GE ADU wave data
63 Exp SiBI -> Ckt Insp Exp Insp
64 Exp SiBI -> Ckt Mean Inspired = 2%, different from 7.1% peak Insp Exp Insp
65 Anesthetizes like 2%, not 7%
66 2 minute Preparation Volatile Prime for anesthesia circuit Oxygen Prime for lungs Mental Prime for patient
67 Mental Prime Patient Instruct and practice VC VC = Vital Capacity breath Breathe all the way out Take a deep breath in Hold it in Maintain positive verbal contact Create positive experience through words and actions
68 2 minute Preparation is done Volatile Prime for anesthesia circuit Oxygen Prime for lungs Mental Prime for patient Ready for Volatile Induction
69 VI - Volatile Induction Say and Do Say: Exhale Do: Switch to Sevoflurane mask Say: Inhale and hold inspiration Do: Maintain positive verbal contact Maintain high (7%) inspired sevoflurane conc.
70 > One Breath Induction If patient breathes out Instruct patient to take another deep breath and hold it Take another deep breath and hold it Take another deep breath and hold it
71 Data from BWH First Series 18 patients with perfect data for analysis In first 20 seconds after VCI Sevoflurane %M SD Inspired = Expired = Nitrous Oxide Mean = Most lost lash reflex in 1 breath Some required 2 breaths Few required 3 breaths
72 Anesthetize and Oxygenate together VCI Sevo 8% in Oxygen Slightly slower No Second Gas Effect No additional effect of N2O Always quite adequate Allows same settings from VCI to airway securement (Tracheal Tube, LMA)
73 Volatile Induction Phase Two Deepen Inhalation Anesthesia After loss of consciousness in 1 min Continue induction with 8% Sevo Assist or control ventilation Prepare to secure airway if desired O 2 + Sevo Secure airway LMA OK in 2 minutes ETT OK in 3-5 minutes (no relaxant)
74 Produce apnea before removing mask Hyperventilate to apnea Avoid losing anesthetic from lungs blood brain
75 Or, keep anesthesia light Natural airway or Minor airway interventions Oropharyngeal airway Nasopharyngeal airway Deepen anesthesia before incision
76 Monitor Carefully Often BP q 1 minute (for a while) Always automatic
77 Induction is complete Maintenance begins
78 VM - Volatile Maintenance Anesthesia We have always done this Maintain desired anesthetic depth Decrease fresh gas flows to save cost Increase vaporizer setting Maintain previous expired anesthetic conc. Maintain previous anesthetic depth Increase and decrease depth as required React or anticipate
79 VM - Volatile Maintenance Anesthesia Depth = Constant + Adjust as required Three anesthetic conditions Constant Increase Decrease
80 VM - Volatile Maintenance Anesthesia Depth = Constant + Adjust as required Three anesthetic conditions Constant Increase Vaporizer to Max = 8% Decrease Vaporizer off = 0% Increase FGF if required Readjust vaporizer to near prior setting Overpressure Underpressure
81 -30 Up and down using Overpressure and Underpressure -20 time (minutes) I E
82 For short cases, remember Awakening begins just after induction Don t be afraid to turn the vaporizer off Bring expired concentration down to 1.3 MAC Keep expired at 0.7 MAC near the very end
83 Prepare for recovery - always Recovery begins with wake up Recovery ends with patient back to normal Normal means normal - Patient is satisfied Anesthesiologist is satisfied Surgeon is satisfied
84
85 Volatile Emergence Volatile emergence is smooth Create and maintain zero (0.0) inspired agent concentration Empty the Reservoir Bag, Flush O 2, High FGF Ventilate anesthetic out of lungs Minute ventilation > 4 L/min p ET CO 2 around 36 mmhg
86 FGF is low Problems occur with wake up if FGF or Ventilation is low Poor circuit Increase FGF wash out; FGF too low
87 Problems occur Ventilation with wake up if FGF is or Ventilation low is low Poor lung wash out. Ventilation is too low
88 Better wake up w experience Usually, wake up is better Low inspired Low expired
89 1.0 A/I.8 Volatile Induction Zerothane Des 0.88 Sev Iso Hal F E F I.2 Data from Yasuda & Eger, Minutes of administration 30
90 1.0 0 Minutes of discontinuation 30.8 Volatile Emergence.6 After a long anesthetic Hal F E F E0.4 Iso A/I Sev Des Zerothane Alveolar response to inspired =
91 1.0 0 Minutes of discontinuation 30.8 Volatile Emergence.6 After a long anesthetic Hal F E F E0.4 Iso MAC Awake.2 A/I Sev Des Zerothane Alveolar response to inspired =
92 1.0 0 Minutes of discontinuation 30.8 Volatile Emergence.6 After a long anesthetic Hal F E F E0.4 Iso MAC Awake 0.20 A/I Sev Des Zerothane MAC climb to strether (approx) Alveolar response to inspired =
93 Clinical Benefits of VIMA No need for IV Induction agent Opioid Muscle relaxant (NMB) Reversal agents for NMB Other drugs Complications Avoid Side Effects Avoid Costs
94 VIMA provides Deep anesthesia from beginning to end No additional drugs for intubation No additional drugs for intra-op pain Rapid awakening and return to normal Post-op pain requires local anesthesia infiltration anesthesia and post-op analgesic
95 How to avoid slow wake ups
96 FGF is low Problems occur with wake up if FGF or Ventilation is low Poor circuit Increase FGF wash out; FGF too low
97 Problems occur Ventilation with wake up if FGF is or Ventilation low is low Poor lung wash out. Ventilation is too low
98 Better wake up w experience Usually, wake up is better
99 Better wake up w experience Usually, wake up is better Low inspired Low expired
100 Summary VIMA is Volatile Induction and Maintenance Anesthesia. VIMA is an acceptable equivalent alternative to IV plus Volatile combinations. VIMA preparation requires 2 minutes for circuit anesthetic prime, lung oxygen prime, and brain psychological prime. VIMA Sevoflurane induction is faster than IV Propofol (51 ± 4 sec vs. 81 ± 12 sec). VIMA wake up is as fast and uncomplicated as Propofol induction and VM anesthesia.
101 Thank you
102
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