Lauren McClure, PharmD November 5, 2019 - Wild Apricot · Lauren McClure, PharmD PGY2 Emergency...
Transcript of Lauren McClure, PharmD November 5, 2019 - Wild Apricot · Lauren McClure, PharmD PGY2 Emergency...
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Lauren McClure, PharmD November 5, 2019
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Getting High on Mountain Rescue: Pharmacologic considerations in
emergency medicine and transitions of care
Lauren McClure, PharmD PGY2 Emergency Medicine Pharmacy Resident
University of Utah Health
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Disclosure
RelevantFinancialConflictsofInterest◦ CEPresenter,LaurenMcClure,PharmD:◦ None◦ CEmentor,ColganSloan,PharmD,BCPS:◦ None
Off-LabelUsesofMedications◦ Acetazolamide,dexamethasone,ketamine,tranexamicacid,gentamicin,cefazolin,ceftriaxone
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Learning Objectives: Pharmacists
• Recognizeacutemountainsicknessandpotentialsequelae
• Examinetheutilityoftranexamicacidinapatientcase
• Designaprophylacticantibioticregimenforopenfracturesgivenapatientcase
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Learning Objectives: Technicians
• Describethetransitionsofcareinvolvedinremoterescueoperations
• ExplaintheriskfactorsfordevelopingAcuteMountainSickness
• Distinguishappropriateketaminevialconcentrationsbasedonpatientcarearea
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JackandDianearehikingKingsPeakoverLaborDayWeekendonvacationfromAustin,Texas.TheyarriveinSaltLakeCityonSaturdaymorninganddriveouttotheUintastocampatthetrailheadbeforemakingtheirascent.
Patient Case
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Wilderness Medicine 7
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• Jackstartsfeelinglight-headed,decreasedappetite,withincreasingweakness
• Astheyreachthepeak,symptomsprogress:• Occasionalvomiting• Moderateheadache• Mildweakness/fatigue• Dizziness
Patient Case
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• A) Relax, take a break– this is no big deal • B) Recognize moderate acute mountain sickness and move to lower elevation immediately • C) Recognize mild acute mountain sickness - take acetazolamide and keep going • D) Take a magnesium supplement
What is going on? What is the first thing he should do?
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• >2,500 m (8,200 feet) • Within 5 days • Potentially deadly consequences • High-altitude pulmonary edema (HAPE) • High-altitude cerebral edema (HACE)
Acute Mountain Sickness (AMS)
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ProgCardiovascDis.2010May-Jun;52(6):467-84
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é Elevation
ê BarometricPressure
ê PartialPressureofOxygen
HypobaricHypoxia
Pathophysiology of AMS
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ProgCardiovascDis.2010May-Jun;52(6):467-84
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• Speed of ascent • Elevation reached
• Altitude naïve • Prior AMS *Sea-level fitness is NOT protective
Risk Factors
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ProgCardiovascDis.2010May-Jun;52(6):467-84
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2018 Lake Louise AMS Score Symptom Severity Points
Headache NoneMildModerateSevere,incapacitating
0123
Gastrointestinalsymptoms
GoodappetitePoorappetite/nauseaModeratenausea/vomitingSeveren/v,incapacitating
0123
Fatigue/weakness NoneMildModerateSevere,incapacitating
0123
Dizziness/light-headedness
NoneMildModerateSevere,incapacitating
0123
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HighAltMedBiol.2018Mar;19(1):4-6
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• AMS • Mild = 3-5 • Moderate = 6-9 • Severe = 10-12
• Progress to life threatening complications
Identification
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ProgCardiovascDis.2010May-Jun;52(6):467-84
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• AMS + pulmonary signs • Cough • Chest tightness • Congestion
• Incidence 0.01-5%
High Altitude Pulmonary Edema (HAPE)
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ProgCardiovascDis.2010May-Jun;52(6):467-84
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• AMS + mental status change • Ataxia • Drowsiness • Stupor
• Incidence 0.5-1% • Potentially fatal
High Altitude Cerebral Edema (HACE)
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ProgCardiovascDis.2010May-Jun;52(6):467-84
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Recommended• Gradualascent• Acetazolamide• Dexamethasone
Notrecommended• Inhaledbudesonide• Ginkgobiloba• Acetaminophen
AMS Prevention
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WildernessEnvironMed.2019Jun24.pii:S1080-6032(19)30090-0.
2019WildernessMedicineSocietyPracticeGuidelines
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Carbonicanhydraseinhibitor
Increasesbicarbonatesecretion
Inducesmetabolicacidosis
Stimulatesventilation
Acetazolamide
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BMJ2012;345:e6779AnnInternMed.1992;116(6):461-465
Facilitatesacclimatization
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Acetazolamide for AMS Prevention
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BMJ2012;345:e6779
• 2012: BMJ Meta Analysis • 11 randomized, placebo controlled trials • Acetazolamide 750mg, 500mg, 250mg daily • Lowest effective dose: 125mg BID • 4 trials • OR 0.36 (95% CI 0.28 – 0.46) • NNT = 6
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Acetazolamide for AMS Prevention
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WildernessEnvironMed.2019Mar;30(1):12-21
• 2019: RADICAL Trial • Prospective, double blind, randomized, non-inferiority
trial • 73 Trekkers to Everest Base Camp • Compared acetazolamide 62.5mg BID vs standard
125mg BID • Reduced-dose is non-inferior
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Dexamethasone for AMS Prevention
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• Exact mechanism of action in AMS is uncertain • Does not facilitate acclimatization • Recommended dose: 4 mg q12h • Limited data • Ellsworth, et al 1987 – effective prevention (25% vs 77% incidence) of AMS at 4,392m
WestJMed.1991Mar;154(3):289–293.
NEnglJMed1989;321:1707-1713AmJMed.1987Dec;83(6):1024-30
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Non-pharmacologic• Earlyrecognition• Descentof>300m• Supplementaloxygen
Pharmacologic• Dexamethasone• Acetazolamide
Treatment
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WildernessEnvironMed.2019Jun24.pii:S1080-6032(19)30090-0.
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Dexamethasone
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WestJMed.1991Mar;154(3):289–293BrMedJ(ClinResEd).1987May30;294(6584):1380-2
NEnglJMed1989;321:1707-1713
• Standard of care • Dose: 8mg IV, IM, or PO x1 then 4mg q6h • Ferrazzini, 1987 • 35 patients in Alps Valais at 4560m • Randomized, double blind, placebo controlled • 77% symptom reduction
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Acetazolamide for AMS Treatment
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CochraneDatabaseSystRev.2018Jun30;6:CD009567
• 2018Meta-Analysis:• 2randomizedcontroltrials• 25totalpatients• Acetazolamide250mgBID• Nocleareffectonsymptomreduction
• Standardmeandifference-1.15(95%CI-2.56–0.27)
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What is going on? What is the first thing he should do? A) Relax, take a break– this is no big deal B) Recognize moderate Acute Mountain Sickness and move to lower elevation immediately C) Recognize mild Acute Mountain Sickness - take acetazolamide and keep going D) Take a magnesium supplement
28 YO M climbing at ~4000 m, with new onset dizziness, weakness, moderate headache, vomiting
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What risk factors did Jack have for developing Acute Mountain Sickness?
What risk factors did Jack have for developing Acute Mountain Sickness?
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• Diane decides they should move to a lower elevation • Take the shortcut between Anderson Pass and Gunsight Pass • Jack slips on the loose rocks and falls • Diane can see bone sticking out of his leg à calls for help
Moving along…
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Pre-hospital Emergency Transport ChemicalRestraints
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• WhileattemptingtoestablishIVaccess,Jackstartsshoutingandthrashingaround,tryingtoexitthehelicopter
• Flightcrewisstrugglingtoholdhimdown
• Howdoyouwanttohandlethis?
Patient Case
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Howdoyouchoosetochemicallyrestrainthepatient?
A)AdministerFentanyl100mcgthroughanIOline
B)AdministerKetamine4mg/kgIM
C)AdministerKetamine4mg/kgIV
D)Administer“B52”ofdiphenhydramine25mg+Lorazepam5mg+haloperidol5mgIM
28 YO M, altered mental status, combative, with open fracture but no known past medical history
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• Dissociativeanesthetic• Uniquesedativeandanalgesicproperties• NoncompetitiveantagonistatNMDAreceptors
Ketamine
FrontHumNeurosci2016;10:612
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Pros Cons
Emergencereactions
Laryngospasm Tachyarrthmias
XPregnancy
SedationPain
Maintainairway
Stablehemodynamics
Ketamine for Agitation – Balancing Act
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RapidonsetWorsenpsychosis Hypersalivation
FrontHumNeurosci.2016;10:612.
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Intravenous Intramuscular
UsualDose 1-2mg/kg 2-4mg/kg
Onset <1min <5min
Duration 5-10min 20-30min
Ketamine – Dosing Basics in Agitation
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• Typical dose ranges from 2-4 mg/kg IM • Pre-hospital studies report intubation rates of 39-63% • Rates increase with increasing doses
• Noincreaseinsedationabovedissociationthreshold• NotwellestablishedinIMadministration• 1-1.5mg/kgIV• Bioavailability:93%
Ketamine for Agitation
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ClinToxicol(Phila).2019Jul23:1-5.
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• CaseSeriesbyO’Brienetal.2019• Efficacyandsafetyofketamine2mg/kgIMintheEmergencyDept• Successfulsedationoftheagitatedpatient• Results:
• 13/15(87%)hadadequatesedationwithoutneedingintubation• Mediantotaldoseof157.5mg,2mg/kg• 11/15(73%)receivedIMketamineasasecond-lineagent
Why not reduce the dose?
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ClinToxicol(Phila).2019Jul23:1-5.
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Howdoyouchoosetochemicallyrestrainthepatient?
A)AdministerFentanyl100mcgthroughanIOline
B)AdministerKetamine4mg/kgIM
C)AdministerKetamine4mg/kgIV
D)Administer“B52”ofdiphenhydramine25mg+Lorazepam5mg+haloperidol5mgIM
28 YO M, 80 kg, altered mental status, combative, with open fracture but no known past medical history
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• Ketamineusuallypurchasedas3standardconcentrations• 10mg/mLas20mLvial• 50mg/mLas10mLvial• 100mg/mLas5mLvial
What concentration of ketamine do you want to stock in the helicopter?
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• Ketamineusuallypurchasedas3standardconcentrations• 10mg/mLas20mLvial• 50mg/mLas10mLvial• 100mg/mLas5mLvial
YoudecidetoadministerKetamine4mg/kg(320mg)IM• 10mg/mLà32mL• 100mg/mLà3.2mL
What concentration of ketamine do you want to stock in the helicopter?
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Pre-hospital Emergency Transport UncontrolledBleeding
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• Patienthascalmeddown–butisincreasinglyhypotensiveandtheteamisconcernedforinternalbleeding
Patient Case
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• Recombinant Factor VII à no survival benefit in trauma setting • Plasma à COMBAT trial terminated early for futility • Antifibrinolytic agents
• Aprotinin à withdrawn from market in 2007 • ε-aminocaproeic acid à did not reduce transfusions in initial studies • Tranexamic acid (TXA) à perioperative studies reduced need for
blood transfusion
Remote Damage Control Resuscitation
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https://clinicaltrials.gov/ct2/show/NCT01838863JTraumaAcuteCareSurg.2015Jun;78(6Suppl1):S70-5
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Inhibitsactivationofplasminogenàplasmin
Hindersfibrinolysis
Strengthensclots
Reduces
bleeding
Tranexamic Acid (TXA)
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Lysine derivative
JTraumaAcuteCareSurg.2015Jun;78(6Suppl1):S70-5
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Doubleblind,randomized,placebocontrolledtrial
EvaluatedTXAin20,211traumapatients
Intervention:◦ TXA1gIVover10min+1gIVover8hours◦ Placebo
Outcomes◦ Primary:deathinhospitalwithin4weeksofinjury◦ Describedbleeding,vascularocclusion,multiorganfailure,headinjury
CRASH-2
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TheLancet.2010.376(9734):23-32.
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CRASH-2
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• Deathinhospitalwithin4weeks:• TXA:14.5%• Placebo:16.0%• RR0.91,95%CI0.85-0.97,P=0.0035
SecondaryOutcome TXA Placebo Pvalue
Vascularocclusiveevents(MI,CVA,PE,DVT)
1.7% 2.0% 0.084
Surgicalinterventions 47.9% 48.0% 0.79
Bloodtransfusion 50.4% 51.3% 0.21
Lancet.2010.376(9734):23-32.
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CRASH-2
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EarlyadministrationofTXAreducesriskofdeathfrombleeding• <1hourfrominjury
• RR0.68(0.54-0.86• 1-3hoursfrominjury
• RR0.79(0.60-1.04)• >3hoursfrominjury
• RR1.44(1.04-1.99)• Composite–within8hours
• RR0.85(0.76-0.96)
Lancet.2010.376(9734):23-32.
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• Initial concern for futility in TBI patients, potential risk of increased thrombotic stroke • Systematic review and meta-analysis (March 2019) • Pooled 5 RCTs for 917 total patients • TXA reduced rate of hematoma expansion
• RR 0.77, CI 0.61-0.98, p=0.03
• No difference in pooled clinical outcomes of surgery, mortality, neurologic outcome
• No difference in thrombotic event rate
Traumatic Brain Injury (TBI)
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WorldNeurosurg.2019Mar;123:128-135
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Ongoing TXA Trials
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Trial Purpose Outcome
CRASH-3TXAwithin8hoursofTBI
MortalityDisability
PATCH-Trauma Pre-hospitalTXAMortalityFunctionalrecovery
STAAMP Pre-hospitalTXAMortalityClinicaloutcomes
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Whatdoyourecommendforthispatient?
A)Startnorepinephrinegttat0.5mcg/kg/min
B)GiveTXA1gIVbolus
C)Administer1unitofplasma
D)Giveanother1LbolusofNS
28 YO M, s/p traumatic injury, now with BP 86/60, concern for bleeding, has received 2L of normal saline
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Pt condition is tenuous, but not worsening. Paramedic team calls report to the University of Utah Emergency Department’s charge nurse, and prepares for hospital arrival
Patient Case
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Trauma Activation **Picturesincludedinthissectionmaybegraphictosomeviewers**
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Neuro: GCS 14 (E4, V5, M5) Cardiac: BP 89/65, HR 110 Respiratory: Airway intact, SpO2: 94% MSK: Type 3 open fracture of R femur, multiple lacerations FAST exam: Negative Chest XR: mild pulmonary edema What medications do you want to administer before patient goes to the OR?
Patient Case
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Bone fragments exposed to the outside environment
Open Fractures
https://coreem.net/core/open-fractures/
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Gustilo-Anderson Classification
KanakarisNK,GiannoudisPV.“OpenFractures.”TraumaandOrthopaedicClassifications:AComprehensiveOverview.2014;487-493
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Eastern Association for the Surgery of Trauma (EAST) Guidelines
HoffWS,etal.JTrauma2011;70(3):751-754
Gustilo-AndersonType Recommendedantibiotic
Type1and2 Firstgenerationcephalosporin
Type3Firstgenerationcephalosporin
+Oncedailyaminoglycoside
PotentialClostridialcontamination=addpenicillin
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Concerns with Aminoglycosides
• Hypermetabolictraumapatients• Barlettaetal:subtherapeuticin21%• Toschlongetal:subtherapeuticin58.2%
• Nephrotoxicityandacutekidneyinjury(AKI)• 5-15%incidencewithaminoglycosideuse• Highriskofdosingerrors• TraumapatientsatincreasedriskofAKI
JTrauma.2000;49:869-872JTrauma.2003;55:255-262
CurrOpinCritCare.2017;23(6):447-456
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Velmahos et al. • Design:prospectivenonrandomizedstudy
• Population:PatientsadmittedtoasurgicalICU
• Groups:>1antibioticfor>24hvs.1antibioticfor24h• Results:prolongedprophylaxiswithmultipleagentsisanindependentriskfactorfordevelopmentofresistantinfections• (OR2.13,95%CI1.22-3.74,p=0.008
• Nodifferenceinsepsis,organfailure,death
ArchSurg.2002;137:537-542.
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Velmahos et al. • Design:prospectivenonrandomizedstudy
• Population:PatientsadmittedtoasurgicalICU
• Groups:>1antibioticfor>24hvs.1antibioticfor24h• Results:prolongedprophylaxiswithmultipleagentsisanindependentriskfactorfordevelopmentofresistantinfections• (OR2.13,95%CI1.22-3.74,p=0.008
• Nodifferenceinsepsis,organfailure,death
ArchSurg.2002;137:537-542.
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• Singlecenterretrospectivecohortstudy• Implementedanewopenfractureprotocol
• Type1or2:Cefazolin• Type3:Ceftriaxone• Removedaminoglycosides,vancomycin,andpenicillin
• Outcomes• Aminoglycosideandglycopeptideuse• Rateofsurgicalsiteinfections(SSI)
Rodriguez et al.
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Rodriguez,etal.JTraumaAcuteCareSurg.2013;77(3):400-408
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Rodriguez et al.
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Pre-Protocol
(perfractureevent)
Post-Protocol
(perfractureevent)Pvalue
Aminoglycoside/glycopeptide
use53.5%(54/101) 16.4%(12/73) 0.0001
SSIRate 20.8%(21/101) 24.7%(18/73) 0.58
ByGustilloClass
Type1 29.4%(5/17) 6.7%(1/15) 0.09
Type2 8%(2/25) 20%(4/20) 0.24
Type3 29.7%(11/37) 40%(8/20) 0.62
Notgraded 13.6(3/22) 27.8%(5/18) 0.09
Rodriguez,etal.JTraumaAcuteCareSurg.2013;77(3):400-408
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Rodriguez et al.
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Pre-Protocol
(perfractureevent)
Post-Protocol
(perfractureevent)Pvalue
Aminoglycoside/glycopeptide
use53.5%(54/101) 16.4%(12/73) 0.0001
SSIRate 20.8%(21/101) 24.7%(18/73) 0.58
ByGustilloClass
Type1 29.4%(5/17) 6.7%(1/15) 0.09
Type2 8%(2/25) 20%(4/20) 0.24
Type3 29.7%(11/37) 40%(8/20) 0.62
Notgraded 13.6(3/22) 27.8%(5/18) 0.09
Rodriguez,etal.JTraumaAcuteCareSurg.2013;77(3):400-408
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28 YO M, 80 kg, NKDA, Type 3 open fracture of R femur
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What prophylactic antibiotic regimen would be LEAST appropriate for this patient? • A) Cefazolin 2g IV • B) Cefazolin 2g IV + Gentamicin 320 mg • C) Ceftriaxone 2g IV • D) Ciprofloxacin 400 mg IV
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Let’s Review 69
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Self-aid
Firstaidkits
Limitedresources
Limitedaccess
Pre-hospitalcomplications
Moresupplies,knowledge
Limitedoptions
Choosemostappropriateofthesuppliesonhand
TraumaBay
Mostspecializedcare
Patientfactors
Transitions of Care
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Instructions:
Review questions and answers with attendees in whichever format you prefer. If you have multiple-choice questions, please use the Audience Response Cards that will be provided to attendees.
You MUST provide the correct answers to the attendees at this time. This is an ACPE requirement.
Test Questions
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1) Initial Self-Care / Wilderness aid 2) Pre-hospital transport
A) Ground transport B) Air transport
3) Hospital intake A) Trauma bay B) Emergency department
4) Inpatient A) Operating room B) Intensive Care C) Wards
What transitions of care could a mountain rescue patient experience?
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What is going on? What is the first thing he should do? A) Relax, take a break– this is no big deal B) Recognize moderate Acute Mountain Sickness and move to lower elevation immediately C) Recognize mild Acute Mountain Sickness - take acetazolamide and keep going D) Take a magnesium supplement
28 YO M climbing at ~4000 m, with new onset dizziness, confusion, moderate headache, vomiting
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What is going on? What is the first thing he should do? A) Relax, take a break– this is no big deal B) Recognize moderate Acute Mountain Sickness and move to lower elevation immediately C) Recognize mild Acute Mountain Sickness - take acetazolamide and keep going D) Take a magnesium supplement
28 YO M climbing at ~4000 m, with new onset dizziness, confusion, moderate headache, vomiting
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What risk factors did Jack have for developing Acute Mountain Sickness?
What risk factors did Jack have for developing Acute Mountain Sickness?
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• Climbing at elevation > 2,500 m • Summit of King’s Peak is 4125 m
• Non-acclimatized, altitude naïve • Austin, TX is 400m
• Symptoms started within 5 days of arrival to altitude • LLSS of 6 = moderate AMS
What risk factors did Jack have for developing Acute Mountain Sickness?
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Howdoyouchoosetochemicallyrestrainthepatient?
A)AdministerFentanyl100mcgthroughanIOline
B)AdministerKetamine4mg/kgIM
C)AdministerKetamine4mg/kgIV
D)Administer“B52”ofdiphenhydramine25mg+Lorazepam5mg+haloperidol5mgIM
28 YO M, 80 kg, altered mental status, combative, with open fracture but no known past medical history
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Howdoyouchoosetochemicallyrestrainthepatient?
A)AdministerFentanyl100mcgthroughanIOline
B)AdministerKetamine4mg/kgIM
C)AdministerKetamine4mg/kgIV
D)Administer“B52”ofdiphenhydramine25mg+Lorazepam5mg+haloperidol5mgIM
28 YO M, 80 kg, altered mental status, combative, with open fracture but no known past medical history
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Ketamineusuallypurchasedas3standardconcentrations• 10mg/mLas20mLvial• 50mg/mLas10mLvial• 100mg/mLas5mLvial
YoudecidetoadministerKetamine4mg/kg(320mg)IM• 10mg/mLà32mL• 100mg/mLà3.2mL
What concentration of ketamine do you want to stock in the helicopter?
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• Ketamineusuallypurchasedas3standardconcentrations• 10mg/mLas20mLvial• 50mg/mLas10mLvial• 100mg/mLas5mLvial
YoudecidetoadministerKetamine4mg/kg(320mg)IM• 10mg/mLà32mL• 100mg/mL!3.2mL
What concentration of ketamine do you want to stock in the helicopter?
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Whatdoyourecommendforthispatient?
A)Startnorepinephrinegttat0.5mcg/kg/min
B)GiveTXA1gIVbolus
C)Administer1unitofplasma
D)Giveanother1LbolusofNS
28 YO M, s/p traumatic injury, now with BP 86/60, concern for bleeding, has received 2L of normal saline
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Whatdoyourecommendforthispatient?
A)Startnorepinephrinegttat0.5mcg/kg/min
B)GiveTXA1gIVbolus
C)Administer1unitofplasma
D)Giveanother1LbolusofNS
28 YO M, s/p traumatic injury, now with BP 86/60, concern for bleeding, has received 2L of normal saline
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28 YO M, 80 kg, NKDA, Type 3 open fracture of R femur
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What prophylactic antibiotic regimen would be LEAST appropriate for this patient? A) Cefazolin 2g IV B) Cefazolin 2g IV + Gentamicin 320 mg C) Ceftriaxone 2g IV D) Ciprofloxacin 400 mg IV
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28 YO M, 80 kg, NKDA, Type 3 open fracture of R femur
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What prophylactic antibiotic regimen would be LEAST appropriate for this patient? A) Cefazolin 2g IV B) Cefazolin 2g IV + Gentamicin 320 mg C) Ceftriaxone 2g IV D) Ciprofloxacin 400 mg IV
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Lauren McClure, PharmD November 5, 2019