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Transcript of Capnography Could Make You a Rock Star! Mike McEvoy, PhD, RN, CCRN, NRP Staff RN – CTICU and...
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Capnography Could MakeYou a Rock Star!
Mike McEvoy, PhD, RN, CCRN, NRPStaff RN – CTICU and Resuscitation Committee ChairAlbany Medical Center, New YorkEMS Coordinator – Saratoga County, New YorkEMS Editor – Fire Engineering magazine
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Learning Objectives
Upon completion of the presentation the participant will Explain the physiology of capnography Discuss the clinical value of capnography in improving
patient outcomes Recall the role of capnography in the Guidelines for Emergency
Cardiac Care and CPR
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What is Capnography?
Available for spontaneously breathing and for intubated patients
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Uses Circuit Plugged into Monitor
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Produces Waveform
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Capnography
“Capnos” = Greek for smoke From the “fire of life” metabolism CO2 = the waste product of metabolism
Carbon Dioxide is a compound molecule 2 oxygen + 1 carbon 0.03% concentration in room air Odorless; heavier than air Green plants scavenge excess CO2
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Oxygen Lungs alveoli blood
Muscles + Organs
Oxygen
Cells
Oxygen
Oxygen+
Glucose
ENERGY
CO2
Blood
Lungs
CO2
Breath
CO2
Physiology of Metabolism
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SpO2 versus EtCO2
Oxygenation (Pulse Ox) O2 for metabolism SpO2 measures
% of O2 in RBCs Changes within 5 minutes
Ventilation (Capnography) CO2 from metabolism EtCO2 measures exhaled CO2
at point of exit Changes within 10 seconds
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Oxygen Lungs alveoli blood
Muscles + Organs
Oxygen
Cells
Oxygen
Oxygen+
Glucose
ENERGY
CO2
Blood
Lungs
CO2
Breath
CO2
Physiology of Metabolism
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Normal Capnography Waveform
Normal range is 35-45 mmHg Height = total CO2 Length = time/rate
45
0
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Capnography Waveforms
45
0
45
0Hypoventilation
Normal
Hyperventilation
45
0
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Capnogram Phases
Inhale
End-tidal
A B
CD
E
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Capnogram Phases
End-tidal
Begin Exhale (dead space)
A B
CD
E
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Capnogram Phases
End-tidal
End Exhale (plateau)
A B
CD
E
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Capnogram Phases
End-tidal
End of the Wave of Exhalation
A B
CD
E
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98
Sp02
The tube came out!
What about the Pulse Ox?
What Happened?
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Waveform Shape
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Bronchospasm (Asthma)
Mild Moderate
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TestCapnography waveforms
Normal
Hyperventilation
Hypoventilation
Bronchospasm
45
0
45
0
45
0
45
0
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Guidelines 2000
EtCO2 can be useful as a non-invasive indicator of cardiac output generated during CPR
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Carbon Dioxide (CO2) Production
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What If…
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But, with High-Quality CPR…
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Meet Howard Snitzer
54-years old, collapsed Jan 5, 2011 outside Don’s Foods in Goodhue, MN (pop. 900)
2 dozens rescuers took turns providing CPR for 96 minutes
6 shocks with first responder AED, 6 more shocks by Mayo Clinic Air Flight Medics
Transported to Mayo Clinic Cardiac Cath Lab
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Why Not Quit?
Thrombectomy and stent to LAD
10 days in Mayo Clinic “The capnography
told us not to give up” EtCO2 averaged 35
(range 32 – 37)
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Decision to Call the Code
120 prehospital patients in non-traumatic cardiac arrest EtCO2 had 90% sensitivity in predicting ROSC Maximal level of <10mmHg during the first 20 minutes
after intubation was never associated with ROSC
*Source: Canitneau J. P. 1996. End-tidal carbon dioxide during cardiopulmonary resuscitation in humans presenting mostly with asystole, Critical Care Medicine 24: 791-796
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So What’s the Goal During CPR?
Try to maintain a minimum EtCO2 of 10
Push HARD (> 2”)FAST (at least 100)
Change rescuerEvery 2 minutes
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AHA Hospital Guidelines – just released (2013)
Pre, Intra, Post arrest recommendations:1.Real time feedback at the point of care2.Shock early, don’t interrupt CPR, avoid hyperventilation, optimize depth3.BENCHMARK
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AHA Hospital Guidelines – just released (2013)
Pre, Intra, Post arrest recommendations:1.Real time feedback at the point of care2.Shock early, don’t interrupt CPR, avoid hyperventilation, optimize depth3.BENCHMARK
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AHA Guidelines – just released (2013)
Pre, Intra, Post arrest recommendations:1.Real time feedback at the point of care2.Shock early, don’t interrupt CPR, avoid hyperventilation, optimize depth3.BENCHMARK
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AHA Guidelines – just released (2013)
Pre, Intra, Post arrest recommendations:1.Real time feedback at the point of care2.Shock early, don’t interrupt CPR, avoid hyperventilation, optimize depth3.BENCHMARK
![Page 32: Capnography Could Make You a Rock Star! Mike McEvoy, PhD, RN, CCRN, NRP Staff RN – CTICU and Resuscitation Committee Chair Albany Medical Center, New York.](https://reader038.fdocuments.us/reader038/viewer/2022102908/56649e535503460f94b49a24/html5/thumbnails/32.jpg)
AHA Guidelines – just released (2013)
Pre, Intra, Post arrest recommendations:1.Real time feedback at the point of care2.Shock early, don’t interrupt CPR, avoid hyperventilation, optimize depth3.BENCHMARK
![Page 33: Capnography Could Make You a Rock Star! Mike McEvoy, PhD, RN, CCRN, NRP Staff RN – CTICU and Resuscitation Committee Chair Albany Medical Center, New York.](https://reader038.fdocuments.us/reader038/viewer/2022102908/56649e535503460f94b49a24/html5/thumbnails/33.jpg)
Anesthesia
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What Should Happen
Lungs (Good)
$tomach (Bad, Very Bad)
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Anesthesia Litigation
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Respiratory Damaging Events
American Society for Anesthesiologists: Closed Claims Project Database, 2010
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The Answer? Capnography
Oct 1986 – American Society of Anesthesiology (ASA)
Capnography = basic standard of care for intra-operative monitoring
Colorimetric Capnometry Waveform Capnography
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Recent Need for EtCO2
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Guidelines 2005
EtCO2 recommended to confirm ET tube placement
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Capnography Detects ROSC
Indications of Return of Spontaneous Circulation Sudden, sustained rise in EtCO2 from baseline Can occur before pulse or blood pressure are palpable
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EtCO2 to Detect ROSC
90 pre-hospital intubated arrest patients 16 survivors 13 survivors: Rapid rise in exhaled CO2 was the earliest
indicator of ROSC Before pulse or blood pressure were palpable
Wayne MA, Levine RL, Miller CC. “Use of End-tidal Carbon Dioxide to Predict Outcome in Prehospital Cardiac Arrest” . Annals of Emergency Medicine. 1995; 25(6):762-767. Levine RL., Wayne MA., Miller CC. “End-tidal carbon dioxide and outcome of out-of-hospital cardiac arrest.” New England Journal of Medicine. 1997;337(5):301-306.
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Guidelines 2010
Continuous quantitative waveform capnography recommended for intubated patients throughout peri-arrest period
In adults:1. Confirm ETT placement2. Monitor CPR quality
3. Detect ROSC with EtCO2 values
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Guidelines 2010Evidence
Capnography Classes and Levels of Evidence1.Confirm ETT placement: Class I, LOE A2.Monitor CPR quality: Class IIb, LOE C3.Detect ROSC with EtCO2 values: Class IIa, LOE B
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Definition of Classes and Levels of Evidence Used in AHA Recommendations
Class I Conditions for which there is evidence for and/or general agreement that the procedure or treatment is useful and effective.Class II Conditions for which there is conflicting evidence and/or a divergence of opinion about the usefulness/efficacy of a procedure
or treatment. Class IIa The weight of evidence or opinion is in favor of the procedure or treatment.Class IIb Usefulness/efficacy is less well established by evidence or opinion.Class III Conditions for which there is evidence and/or general agreement that the procedure or treatment is not useful/effective and in
some cases may be harmful.Therapeutic Recommendations
Level of Evidence A Data derived from multiple randomized clinical trials or meta-analysesLevel of Evidence B Data derived from a single randomized trial or nonrandomized studiesLevel of Evidence C Consensus opinion of experts, case studies, or standard of care
Diagnostic RecommendationsLevel of Evidence A Data derived from multiple prospective cohort studies using a reference standard applied by a masked evaluatorLevel of Evidence B Data derived from a single grade A study, or one or more case-control studies, or studies using a reference
standard applied by an unmasked evaluatorLevel of Evidence C Consensus opinion of experts
©2010 American Heart Association, Inc. All rights reserved. Goldstein et al. Published online in Stroke Dec. 2, 2010
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Classes of Evidence
I. Standard of care: Just do it!
II. Conflicting evidence: Maybe, maybe notIIa. Evidence favors benefit – Do itIIb. Evidence not so favorable – Think first
III. Not useful, maybe harmful: Don’t do it
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Levels of EvidenceProof
A. A whole lotta proof: Best!
B. Some proof: Better than nothing
C. No proof: But some like the idea
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Guidelines 2010Evidence
Capnography Classes and Levels of Evidence
1. Confirm ETT placement: Class I, LOE AJust do it, best proof
2. Monitor CPR quality: Class IIb, LOE CThink first, some like the idea
3. Detect ROSC with EtCO2 values: Class IIa, LOE BDo it, better than nothin’
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Must We Follow Evidence?
BMJ, Dec 2003 Published cases of survivors falling
from airplanes No published evidence parachutes
actually work
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Guidelines 2010Evidence
Capnography Classes and Levels of Evidence
1. Confirm ETT placement: Class I, LOE AJust do it, best proof
2. Monitor CPR quality: Class IIb, LOE CThink first, some like the idea
3. Detect ROSC with EtCO2 values: Class IIa, LOE BDo it, better than nothin’
?
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TrueCPR®
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Questions?