vasopressors in shock diane j lum, pharmd, bcacp stony brook university hospital 9/30/15 1
TRANSCRIPT
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1Vasopressors in shockDiane J Lum, PharmD, BCACP
Stony Brook University Hospital
9/30/15
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2 Objectives
Review the different types of shock (septic, cardiogenic, and neurogenic)
Describe the mechanism of action of vasopressors
Discuss guideline recommendations and literature on septic, cardiogenic, and neurogenic shock
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3 Patient case
AB is a 80 year old M who presents to ED with AMS
Vitals: Temp: 38.8°C, HR 104, RR 23, BP 84/60
Labs: WBC 20, Scr 2.2
Cultures: pending
Home medications: Amlodipine 10 mg, zolpidem 10 mg, metformin 500 mg
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4 Patient Case
Patient given Normal Saline 30 mL/kg
BP 84/65
MAP 55
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5 Patient case
What is the vasopressor of choice in septic shock in a patient not responding to fluids?
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6 Septic Shock
10th leading cause of death in the United States Mortality rates 28 to 50%
Defined as sepsis induced hypotension despite adequate fluid resuscitation
Mean arterial pressure (MAP) goal >65
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7 Vasopressors
Drug Receptors Dosing Side effects
Phenylephrine α1 0.5 to 6 mcg/kg/min Reflex bradycardia, decrease stroke volume
Norepinephrine α1, β1 > β2 0.1 to 3 mcg/kg/min Urinary retention
Epinephrine α1, β1, β2 Infusion: 1 to 20 mcg/minBolus: 1 mg IV q3 to 5 minIM: (1:1000): 0.1 to 0.5 mg
Tachyarrhythmia
Dopamine (low dose) D, β1 5 to 15 mcg/kg/min Tachyarrhythmia
Dopamine (high dose)
D, α1, β1 > β2
>15 mcg/kg/min
Vasopressin V1, V2 0.03 units/min Splanchnic vasoconstriction
Overgaard C, et al. Circulation. 2008;118:1047-1056Micromedex. Micromedexsolutions.com
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8 Septic Shock Treatment Guidelines
First line: Norepinephrine
Adjunct/add on therapy: Epinephrine, vasopressin, phenylephrine
Dopamine alternative to norepinephrine in highly selective patients
Dellinger R et al. Surviving Sepsis Campaign 2012. DOI: 10.1097/CCM.0b013e31827e83af
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9 Norepinephrine
α-adrenergic agonist and β1 agonist
Onset: 1 to 2 min, Duration of action: 5 to 10 min
Dosing: Initial: 0.1 to 0.5 mcg/kg/min and increase by 1 to 2 mcg/min every 3 to 5 min until MAP goal
Max dose: Not well defined, some studies go up to 3 mcg/kg/min
Overgaard C, et al. Circulation. 2008;118:1047-1056Micromedex. Micromedexsolutions.com
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10 Dopamine
Receptor agonist is dose dependent
Low dose (<5 mcg/kg/min): Dopaminergic receptors activated vasodilation of splanchic and renal blood flow
Medium dose (5 to 10 mcg/kg/min): β1 stimulation increase CO and HR
High dose (>10 mcg/kg/min): αlpha effects vasoconstriction
Clinical significance of renal dose is controversial
Dellinger R et al. Surviving Sepsis Campaign 2012. DOI: 10.1097/CCM.0b013e31827e83afIntensive Care Med. 2013;39(2):165-228
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11 Dopamine
Onset: 5 minutes
Duration of action: <10 min
Adverse effects: tachyarrhythmia
Cost: $13.67 for 400 mg IVPB
Dellinger R et al. Surviving Sepsis Campaign 2012. DOI: 10.1097/CCM.0b013e31827e83afIntensive Care Med. 2013;39(2):165-228
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12 Norepinephrine versus Dopamine
Multicenter RCT in patients with septic shock to receive norepinephrine or dopamine
Primary outcome: Rate of death at 28 days: Dopamine (52%) v. norepinephrine (48%), P=0.10
Secondary outcome: Arrhythmic events: Dopamine (24.1%) v. norepinephrine (12.4%), P<0.001
DeBacker et al. 2010. N Engl J Med;362:779-89
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13 Patient Case
AB is a 80 year old M who presents to ED with AMS
Vitals: Temp: 38.8°C, HR 104, RR 23, BP 84/60, MAP 55, weight 50 kg
Labs: WBC 20, Scr 2.2, BG 450, Lactic Acid 5.5
Patient is on norepinephrine 35 mcg/min
Which vasopressor would you add onto norepinephrine?
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14 Epinephrine
Effects α1, β1, β2
β adrenergic > at low doses (< 10 mcg/min)
α1 adrenergic > at high doses
Doses > 20 mcg/min pure alpha effects
Dellinger R et al. Surviving Sepsis Campaign 2012. DOI: 10.1097/CCM.0b013e31827e83afIntensive Care Med. 2013;39(2):165-228
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15 Epinephrine
Duration of action: <5 min
Excretion: Renal
Adverse effect: Increase serum lactate, decrease splanchnic flow tachyarrhythmia
Dellinger R et al. Surviving Sepsis Campaign 2012. DOI: 10.1097/CCM.0b013e31827e83afIntensive Care Med. 2013;39(2):165-228
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16 Epinephrine Indications
Second line vasopressor in septic shock in addition to norepinephrine
Cardiac arrest: epinephrine 1:10,000 1 mg q3 to 5 min
Anaphylaxis: epinephrine 1:1000
0.1 to 0.5 mg IM q5 to 10 min PRN
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17 Phenylephrine
α1 adrenergic agonist
Increases systemic vascular resistance (SVR) and BP
Rapid bolus for immediate correction of severe hypotension
Dose for push dose pressor: 50 to 100 mcg
Dose for continuous infusion: 0.5 to 6 mcg/kg/min or 100 to 180 mcg/min
Overgaard C, et al. Circulation. 2008;118:1047-1056Micromedex. Micromedexsolutions.com
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18 Phenylephrine
Onset: within a minutes
Duration of action: 1 to 2 hours
Excretion: Primarily kidneys
Cost: $33.58 for one 50 mg vial
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19 Vasopressin
Stored in posterior pituitary gland released after increase in plasma osmolality or hypotension
V1 stimulation causes vasoconstriction in vascular smooth muscle
V2 (renal collecting ducts) mediate water reabsorption
Dose: 0.03 units/min in septic shock
Dellinger R et al. Surviving Sepsis Campaign 2012. DOI: 10.1097/CCM.0b013e31827e83afIntensive Care Med. 2013;39(2):165-228
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20 Vasopressin
Onset: Rapid, peak effect within 15 min
Duration: 20 min
Metabolism: both kidneys and liver
Cost: $116 for one 20 units/mL vial
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21 Vasopressin
Adjunct for septic shock
Augments adrenergic vasopressors effects
Pressor effects of vasopressin relatively preserved during acidic conditions
Dellinger R et al. Surviving Sepsis Campaign 2012. DOI: 10.1097/CCM.0b013e31827e83afIntensive Care Med. 2013;39(2):165-228
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22 Administration of vasopressors
Central versus peripheral line
Systematic review showed complications occurred from peripheral line administration with infusions running >4 hours
Treatment: Phentolamine
Loubani et al. J Crit Care, 2015;30(3):653e9-e17Ricard et al. Crit Care Med, 2013;41:2108-15
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23 Patient Case
BB is a 55 year old M who presents to ED with SOB and CP
PMH: MI, dyslipidemia, diabetes, HTN
Vitals: Temp 37°C, HR 100, BP 96/68
Patient given morphine for CP
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24 Patient Case
BP dropped to 68/42
Diagnosis: Cardiogenic shock secondary to ACS
What vasopressor would you start?
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25 Cardiogenic shock
Occurs in 5 to 8% of patients hospitalized for STEMI
Diagnosis: SBP <90 mm Hg for 30 min, MAP <65 mm Hg for 30 min, or
vasopressors required to achieve SBP >90 mm Hg
Pulmonary congestion or elevated left ventricular filling pressures
Signs of impaired organ perfusion (AMS, cold clammy skin, oliguria, increased serum lactate)
Reynolds et al. 2008. Circulation;117:686-697
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26 Cardiogenic shock and low cardiac output
Antman et al. 2004. ACC/AHA Practice Guidelines
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27 Cardiogenic Shock
De Backer et al. cohort study showed mortality reduction with norepinephrine versus dopamine
Norepinephrine and dopamine have inotropic properties
Epinephrine alternative to norepinephrine
Levy et al. Annals of Intensive Care.2015;5:17
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28 Patient Case
DJ is a 40 year old male who presents to the ED with spinal injury from MVA
DJ was intubated by EMS
Vitals: Temp: 37°C, HR 45, BP 70/55
Diagnosis: neurogenic shock
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29 Patient Case
Which vasopressor would you give this patient?
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30 Neurogenic Shock
Defined: Reduced BP from neurologic causes
Must exclude other causes of hypotension first
Bradycardia common symptom of neurogenic shock
First ensure intravascular volume is restored
J Spinal Cord Med. 2008; 31(4)
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31 Neurogenic Shock
Dopamine, norepinephrine, or phenylephrine can treat hypotension
Norepinephrine may increase BP and HR due to alpha and beta properties
Dopamine may be favored over phenylephrine in bradycardic patients
Phenylephrine pure alpha1 agonist and increase peripheral tone
J Spinal Cord Med. 2008; 31(4)
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32 Summary
Norepinephrine is first line treatment for septic shock
Norepinephrine has lower incidence of arrhythmias compared to dopamine
Dopamine and norepinephrine have inotropic properties and are used for cardiogenic shock
First line treatment for neurogenic shock unclear
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33Vasopressors in shockDiane J Lum, PharmD, BCACP
Stony Brook University Hospital
9/30/15