pharmacotherapy management in patients with extracorporeal ... ecls... · pharmacotherapy...
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Pharmacotherapy Management in Patients with Extracorporeal Membrane Oxygenation
Ayesha Ather, PharmD, BCPS, BCCPProgram Director, PGY2 Cardiology Pharmacy Residency
Assistant Adjunct Professor, College of PharmacyUniversity of Kentucky
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Faculty Disclosure
• I have no conflicts of interest to disclose.
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• Gap = Lack of treatment guidelines and published research often leave providers with no clear way to optimally treat patients
• Need = Our learners need strategies to manage patients on extracorporeal membrane oxygenation (ECMO)
Educational Need/Practice Gap
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Upon completion of this educational activity, you will be able to:
1. Identify alterations in pharmacokinetics (PK) associated with ECMO
2. Review dose adjustments and monitoring of analgesics, sedatives, and antimicrobials in critically ill patients on ECMO
3. Evaluate the anticoagulation management and monitoring practices in patients on ECMO
Objectives
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• What is the desired change/result in practice resulting from this educational intervention?
• As a result of the information/tools provided in this activity, learners should be better able to utilize appropriate pharmacologic therapies to manage patients on ECMO
Expected Outcome
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ECLS Registry Report: International Summary 2019
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Pharmacokinetic Alterations
Drug Factors Disease Factors
Extracorporeal Factors
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Critical Illness
Augmented Cardiac Output
Leaky Capillaries/Volume
Resuscitation
Altered Protein Binding
End-organ Dysfunction
Increased Clearance Increased Volume of Distribution
Decreased Plasma
Concentrations
Decreased Clearance
Increased Plasma
Concentrations
Dzierba et al. Crit Care. 2017:21;21(1):66
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Extracorporeal Membrane Oxygenation
Augmented Cardiac Output Hemodilution Drug Sequestration End-organ
Dysfunction
Increased Clearance Increased Volume of Distribution
Decreased Plasma
Concentrations
Decreased Clearance
Increased Plasma
Concentrations
Dzierba et al. Crit Care. 2017:21;21(1):66
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• ECMO Circuit• Tubing type• Oxygenator membrane• Priming solution• Age of the circuit
Extracorporeal Membrane Oxygenation
A: Tubing/PumpB: OxygenatorC: Priming solution
A
BC
Preston et al. J Extra Corpor Technol 2010 S;42(3):199-202Shekar et al. J Crit Care 2012; 27(6): 741.e9-18
Wildschut et al. Intensive Care Med 2010; 36(12): 2109-2116
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Drug Factors - Analgesics and Sedatives
Dzierba AL et al. Pharmacotherapy 2019 Mar;39(3):355-368
Lipophilicity (log p value) and protein-binding properties of common opioids and sedatives
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Analgesics and Sedatives
0
20
40
60
80
100
120
Morphine Midazolam Fentanyl Propofol
Perc
enta
ge
Simulated Adult ECMO Circuit
0 Minutes1440 Minutes
Shekar et al. Crit Care. 2012;16(5):R194Lemaitre et al. Critical Care. 2015;19:40
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How to Manage Pain and Sedation
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Routine assessment of pain, agitation and delirium
Pain should be treated before sedation
Target light sedation (vs deep sedation)
Propofol or dexmedetomidine preferred over benzodiazepines for sedation
Performing rehabilitation or mobilization
Key Guideline Concepts
Barr J, et al. Crit Care Med 2013;41(1):263-306Devlin JW, et al. Crit Care Med 2018;46(9):e825-e873
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48-hrs post VV ECMO
initiation(n=45)
Deeply sedated, n (%) 43 (96)Continuous infusion sedative, n (%) 43 (96)Continuous infusion opioid, n (%) 44 (98)Daily propofol dose in mg, median (IQR)
3,380 (1,105–4,110)
Daily midazolam equivalents dose in mg, median (IQR)
202 (103–247)
Daily fentanyl equivalents dose in mcg, median (IQR)
4,800 (3,000–5,820)
Application of Guidelines
24-hrs before VV ECMO
discontinuation(n=35) 8 (23)
16 (46)24 (69)1,760
(960–2,960)32
(14–81)1,625
(610–3,345)
48-hrs post VV ECMO
discontinuation (n=30)1 (3)
8 (27)12 (40)
660 (540–2,220)
32 (10–122)
720 (150–1,660)
DeBacker J, et al. ASAIO J 2018;64:544-551
IQR: interquartile range
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Initial Preferred Opioid n=221 (%)
Fentanyl 171 (77)
Hydromorphone 36 (16)
Morphine 10 (5)
Current Practice and PerceptionsSecond Preferred
Opioid n=221 (%)
Hydromorphone 106 (48)
Morphine 48 (21)
Fentanyl 38 (17)
Initial Preferred Sedative for Deep
Sedationn=221 (%)
Propofol 155 (70)
Benzodiazepines 54 (24)
Dexmedetomidine 9 (4)
Ketamine 2 (1)
Initial Preferred Sedative for Light
Sedationn=221 (%)
Dexmedetomidine 100 (45)
Propofol 85 (39)
Benzodiazepine infusion 16 (7)
Benzodiazepine prn 9 (4)
Second Preferred Sedative for Deep
Sedationn=221 (%)
Benzodiazepines 90 (41)
Dexmedetomidine 52 (23)
Propofol 41 (19)
Ketamine 27 (12)
Second Preferred Sedative for Light
Sedationn=221 (%)
Dexmedetomidine 81 (37)
Benzodiazepine prn 49 (22)
Propofol 45 (20)
Ketamine 12 (5)
Perception that opioid dosing is higher with VV-ECMO = 121 (55)Perception that sedation dosing is higher with VV-ECMO = 131 (59)
Dzierba et al. J Crit Care. 2019 Oct;53:98-106
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• Drug dosing recommendations are unlikely to be evidence-based
• Use published pharmacokinetic data in critically ill patients to make dosage adjustments
• Set daily sedation goals and consider daily interruption of sedatives
• Lipophilicity and protein binding appear to be important factors affecting pharmacokinetics
Analgesia and Sedation Considerations
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• Therapeutic failure
• Potential emergence of resistant microorganisms
• Toxicity
Antimicrobial Dosing Considerations
HA et al. Pharmacotherapy. 2017;37(2):221-235
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Drug Factors - Antimicrobials
Lipophilicity (log p value) and protein-binding properties of common antimicrobials
Dzierba AL et al. Pharmacotherapy 2019 Mar;39(3):355-368
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VancomycinPatients Endpoints
11 ECMO11 Controls No difference in
clearance or volume of distribution
20 ECMO60 Controls11 ECMO11 Controls
Antimicrobials and ECMO
AmikacinPatients Endpoints
50 ECMO50 Controls
No difference in Cmax and Cmin
Cmax <60 mg/mL = 26% (ECMO) vs. 34% (Controls)7 ECMO50 Controls
Patients receiving ECMO had a higher Vd and lower Cl
106 ECMO Cmax <60 mg/mL = 39%Cmax = peak serum concentrations; Cmin = trough serum concentrations; Vd = volume of distribution; Cl = clearance
Gélisse et al. Intensive Care Med. 2016;42(5):946-948Ruiz-Ramos et al. ASAIO J. 2018;64(5):686-688
Touchard et al. Crit Care. 2018;22(1):199Park SJ et al. PLoS One. 2015;10(11):e0141016
Wu CC et al. J Formos Med Assoc. 2016;115(7):560-570Donadello K et al. Crit Care. 2014;18(6):632
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• Case control cohort: Total of 41 therapeutic drug monitoring (TDM) results
β-Lactam Pharmacokinetics in ECMO
Meropenem(n=27)
Piperacillin/Tazobactam(n=14)
ECMO Control ECMO ControlVolume of Distribution (L/kg) 0.46 (0.26–0.92) 0.60 (0.42–0.90) 0.33 (0.26–0.46) 0.31 (0.21–0.41)
Elimination half life (h) 3.0 (2.1–4.8) 2.9 (2.4–3.7) 2.0 (1.1–4.2) 1.6 (1.0–4.7)
Total drug clearance (mL/min) 125 (63–198) 144 (97–218) 156 (91–213) 134 (47–179)
Donadello et al. Int J Antimicrob Agents. 2015;45(3):278-82
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β-Lactam Pharmacokinetics in ECMO
Donadello et al. Int J Antimicrob Agents. 2015;45(3):278-82
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Drug Protein Binding Log p Volume of
DistributionExpected
EffectDose
Adjustment
Ceftriaxone 85-90% -0.01 5.78–13.5 L Moderate sequestration Not required
Vancomycin 50% -4.4 28–70 L Minimal sequestration Not required
Levofloxacin 24–38% 0.65 88.9 LMinimal to moderate
sequestrationNot required
Gentamicin/Tobramycin/Amikacin
< 30% < 0.0 14–21 L Minimal sequestration Not required
Voriconazole 58% 2.56 322 L Moderate to high sequestration Yes
Dose Adjustments for Select Agents
HA et al. Pharmacotherapy. 2017;37(2):221-235
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• PK data in adult patients on ECMO are sparse
• Consider loading dose for drugs with moderate to high
sequestration
• Dose guided by therapeutic drug monitoring when applicable
• Monitor for signs of infections
Antimicrobial Dosing Considerations
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Bleeding and Thrombosis Complications
• Meta-analysis: 12 studies (1763) patients
• Any bleeding (33%)
• Hemolysis (18%)
• Venous thrombosis (10%)
• Gastrointestinal bleeding (7%)
• Disseminated intravascular coagulation (5%)
Zangrillo et al. Crit Care Resusc. 2013;15(3):172-178
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The Clinical Challenge
ThrombosisBleedingWhich
Anticoagulant?
Zangrillo et al. Crit Care Resusc. 2013;15(3):172-178
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Guidelines
“These guidelines describe useful and safe practice, but these are not necessarily consensus recommendations. These guidelines are not
intended as a standard of care, and are revised at regular intervals as new information, devices, medications, and techniques become available.”
• Heparin bolus (50-100 units/kg) at time of cannulation, continuous infusion during ECLS
• Direct thrombin inhibitors• Monitor ACT, aPTT, or anti-Xa
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GoalsACT 180-200 secMedian antithrombin 70%Anti-Xa 0.3-0.7 IU/mL
Transfusion TriggersPlatelets <100kFibrinogen <145mg/dL
Monitoring FrequencyAPTT q6-8hCBC q6-8hFibrinogen >12hFree hemoglobin >12hAntithrombin q13-24hAnti-Xa q13-24h
Practice Survey of 121 ECMO Centers
Bembea et al. Pediatr Crit Care Med 2013;14(2): e77
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Predictable dose response Stable dosing Quick onset Reliable monitoring ReversibilityWithout adverse drug reactions Effectively prevent thrombosis Minimal bleeding risk
Ideal Parenteral Anticoagulant
Pharmacokinetics (PK)Pharmacodynamics (PD)
Usability
Outcomes
Garcia et al. Chest. 2012;141(2 Suppl):e24S-e43S
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Bivalirudin
Proteolytic Metabolism +
Renal EliminationDirect Thrombin
Binding
PK and PD
Predictable Onset of Action & EliminationPredictable Dose Adjustments
aPTT Stability
Heparin
Plasma Protein Binding
ATIII Dependence
Unpredictable Onset of Action & EliminationNonlinear Dose Adjustments
aPTT Instability & Heparin Resistance
Thomas et al. Semin Thromb Hemost. 2018;44(1):20-29Coughlin et al. ASAIO J. 2015;61(6):652-655
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Heparin
Monitoring ACT, aPTT, anti-Xa, TEG/ROTEM
Reversal ProtamineHalf life 90 min
ADR HIT, thrombocytopenia
Bivalirudin
Monitoring ACT, aPTT, TT, TEG/ROTRM
Reversal No antidoteHalf life 25 min
ADR Minimal
Heparin vs Bivalirudin
Thomas et al. Semin Thromb Hemost. 2018;44(1):20-29Coughlin et al. ASAIO J. 2015;61(6):652-655
ACT: activated clotting time; aPTT: activated partial thromboplastin time; TEG or ROTEM, thromboelastography or rotational thromboelastometry; TT: thrombin time; ADR: adverse drug reaction
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Study Design Subjects Bivalirudin Outcomes
Ranucci, 2011 Retrospective21 (11 adults) PostcardiotomyVA-ECMO
n=13ACT 160-180 secaPTT 50-80 sec
Blood product use: FFP, plateletsBlood loss
Pieri, 2013 Retrospective 20 adultsVA-ECMO 10
n=10aPTT 45-60 sec
Major/Minor bleeding = NDThrombosis = ND
Berei, 2017 Retrospective 72 adultsVA-ECMO 66
n=44aPTT 45-65 sec or 60-80 sec
Major/Minor bleeding = NDThrombosis = ND
Heparin vs Bivalirudin
ND: No difference
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Bivalirudin
Heparin
Heparin
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• Most data in pediatric population
• Center specific protocols
• Heparin is the drug of choice???
• Variable monitoring strategies
• UK primarily uses bivalirudin and monitors aPTT
Anticoagulation Considerations
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Pharmacotherapy Management in Patients with Extracorporeal Membrane Oxygenation
Ayesha Ather, PharmD, BCPS, BCCPProgram Director, PGY2 Cardiology Pharmacy Residency
Assistant Adjunct Professor, College of PharmacyUniversity of Kentucky