making the case for implementing goal directed...
TRANSCRIPT
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Making the case for implementing goal directed
therapy Bobbi Leeper RN or Kathryn Von Rueden RN
Senior Education Consultants Edwards Lifesciences
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What is the Problem?
• Traditional end-points of resuscitation are often misleading and inadequate.
• Poor outcomes are due to inability to meet oxygen demands and development of oxygen debt.
• Targeting specific hemodynamic and oxygenation goals improve outcomes.
• Challenges exist to implement goal directed therapy despite known benefits.
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MAP maintained with 15 - 18% blood loss
• Pressure is determined by resistance and flow. P = R x F
• Pressure is not a good indicator of flow.
• Up to approximately 15 -18 % of blood volume may be lost and pressure will be maintained by an increase in resistance.
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CVP and PAOP: Poor Predictors of Fluid Status
• Kumar et al. CCM 2004• Pressure based indices did not correlate to volume or change
in stroke volume after a fluid bolus.
Pre-fluid bolus Post fluid bolus Pre-fluid bolus Post fluid bolus
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Dynamic vs. Static Parameters
Predicting SVI changes >= 5%, CI > 15%Cannesson 2009 & Michard 1999
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Cardiorespiratory Monitoring:
• Optimize the balance between oxygen supply and demand
• Maximize delivery to enhance oxygen utilization• Protect against tissue hypoxia
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Cardiorespiratory System: 3 Step Process
• Pulmonary Gas Exchange– Ventilation
• Oxygen Delivery– Perfusion
• Systemic Gas Exchange– Oxygen Utilization
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The Balance
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Compensatory Mechanisms
• Maintain Balance between Oxygen Delivery and Demand– 1. Increase cardiac output: Heart rate first – 2. Redistribution of blood flow– 3. Increase oxygen extraction
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Cardiorespiratory Assessment Oxygen Delivery: DO2 = CO x CaO2 x 10 = 950 - 1150 ml/minDO2I = 400 – 500 ml/min/m2
[ CO2 = (1.38 x Hgb x SO2) + (0.0031 x PO2)]
Oxygen Consumption: VO2 = CO x (CaO2 – CvO2) x 10 =
200 - 250 ml/minVO2I = 120 – 160 ml/min/m2
Indexed values are multiplied by CI
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VO2/ DO2 Relationship:
DO2 = CaO2 x CO x 10 = 1000 ml/min
VO2 = CO x (CaO2 - CvO2) x 10 = 250 ml/min
O2ER = VO2/DO2 = (250/1000)= .25
O2ER = Oxygen extraction ratio
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Conceptual VO2 / DO2 Relationship
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Implications of Oxygen Debt:Factors Influencing accumulation of Oxygen Debt: O2 Demand > O2 Consumed = O2 Debt Decreased oxygen delivery Decreased cellular extraction Increased demands
VO2
TIME
O2
Pay back Interest150
ml/min Debt
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Timing or Targets?
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Rivers Calls for EGDT
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EGDT: The Targets
CVP
MAP
ScvO2
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Surviving Sepsis Campaign Results (CCM 2010;38(2))
252 sites, 18 countries, n=15,775165 sites used (excluded sites with < 20 pts)
Final n=15,022
2 year follow up Mortality reductions:
7 % Absolute Risk Reduction 37% to 30.8% p=.0015.4 % Risk Adjusted Decrease
1st 6 hr bundle compliance increased10.9% to 30.1%
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Impact of SSC protocols on LOS & mortality in septic shock
N= 384 septic patients vs. historical control
• Compliance with 6 hr bundle associated with reduced mortality
• Achievement of ScvO2/SvO2 >70% associated with improved mortality
Ortega et al: CCM 2010;38:1036-1043
No Bundle
With Bundle
Mortality 57.3 % 37.5 %
Hospital LOS
41 d 36.2 d
ICU LOS 11 d 8.4 d
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Barochia AV, et al: Bundled care for severe sepsis: Analysis of clinical trials CCM 2010;38(2)668-678
Bundled care for severe sepsis
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Timing or Targets or BOTH?
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O2ER in High Risk Surgery • Conclusions: Early
treatment directed to maintain O2ER at < 27% reduces organ failures (27 failures vs. 9 failures, p < 0.001) and hospital stay (11.3 3.8 days vs. 13.4 6.1 days, p < 0.05) of high-risk surgical patients.
• A prospective, randomized, controlled multi-center trial.
• 135 high-risk major abdominal surgery.
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O2ER as a target
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Does timing matter?
• Critical illness increases metabolic demand
• Cardiovascular system must meet demand to avoid tissue hypoxia
• Development of tissue hypoxia correlates with survival rate
VO2
TIME
O2 Debt
Pay back Interest
150 ml/min
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Kern & Shoemaker CCM 2002 21 Studies Reviewed
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Impact of GDT on MortalityHamilton, Cecconi, Rhodes , Anesth Analg 2010: accessed on-line 3/17/2011 2010
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Goal-directed therapy in high-risk surgicalpatients: a 15-year follow-up study
• Alive at 15 yrs:11(20.7%) EGDT pts vs. 4 (7.5%) control (p=0.09)
• Median survival EGDTgroup was increased by 1,107 days (>3yrs)(1,781 vs. 674 days, p=0.005)
• LT survival associated w/ age, no post-op cardiac complications, EGDT
Rhodes, A. et al: Intens Care Med. 2010
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Lees CC 2009 HRS Algorithm (modified)
SurgeryInstitute flow monitoring and goal-directed fluid therapy pre-op and intra-op if possible
Ensure optimum management of chronic disease and acute physiology Refer to AHA/ACC Guidelines
Identify high-risk surgical patientShoemaker/Boyd criteria, POSSUM Establish functional capacity
Maintain monitoring and goalsFor up to 8 hours
Target oxygen delivery/tissue perfusion goalsDO2I > 600ml/min/M2, CI > 4.5l/min/M2 Fluid until not fluid responsive, add
inodilator if goals not achieved
Admit to ICU post-opInstitute flow monitoring Ensure adequate oxygenation and hct
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Making the case for implementing goal directed therapy
CAUTION: Federal (United States) law restricts this device to sale by or on the order of a physician. See instructions for use for full prescribing information, including indications, contraindications, warnings, precautions and adverse events.
Bobbi Leeper and Kathryn Von Rueden are paid consultants of Edwards Lifesciences. Any quotes used in this material are taken from independent third-party publications and are not intended to imply that such third party received or endorsed any of the products of Edwards Lifesciences.
As a member of the Advanced Medical Technology Association ("AdvaMed"), Edwards Lifesciences strictly adheres to the requirements of the AdvaMed Code of Ethics regarding interactions with health care professionals. Edwards Lifesciences wishes to disclose that all speakers, instructors and panel members will receive compensation and reimbursement of reasonable travel expenses from Edwards Lifesciences for their services in full compliance with all applicable laws, rules and regulations, including the AdvaMed Code of Ethics.
Edwards, Edwards Lifesciences, the stylized E logo, FloTrac, Vigileo and PreSep are trademarks of Edwards Lifesciences Corporation. All other trademarks are the property of their respective owners. ©2011 Edwards Lifesciences Corporation. All rights reserved. AR06158
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