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Treatment Guidelines for ST-segment
Elevation Myocardial Infarction(STEMI) and Non ST-segment Elevation
Myocardial Infarction (NSTEMI)
Brady Helmink
University of Nebraska Medical Center
College of Pharmacy
Class of 2013 Pharm.D. candidate
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Objectives
Understand which conditions classify as Acute
Coronary Syndromes (ACS)
Identify the difference between the presentation ofNSTEMI vs. STEMI
Know how to stratify patients with NSTEMI using the
TIMI risk score
Compare and contrast treatment algorithms for high
and low-risk patients with NSTEMI
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Objectives
Explain how the pathophysiology of STEMI differs
from NSTEMI
Understand the importance of PCI and time torevascularization in both NSTEMI and STEMI
Recognize the significance of fibrinolytic agents and
their place in therapy Discuss similarities and differences between the
treatment of STEMI and NSTEMI
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Acute Coronary Syndrome (ACS)
Refers to anginal symptoms at rest for > 20 minutes;may or may not be relieved by SL NTG
Three categories ST-segment Elevation Myocardial Infarction (STEMI)
Non ST-segment Elevation Myocardial Infarction (NSTEMI)
Unstable Angina (UA)
Management focused on rapid diagnosis, riskstratification, and therapies to restore coronary bloodflow and reduce myocardial ischemia
DiPiro, Joseph T. "Chapter 24. Acute Coronary Syndromes." Pharmacotherapy: A Pathophysiologic Approach. New
York, N.Y: McGraw-Hill Medical, 2011. Access Pharmacy.http://www.accesspharmacy.com/content.aspx?aID=7972196
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Patient Case
BC, a 61 year-old female presents to the Onawa
ER with progressive substernal chest pain radiating
up into her neck and jaw over the past four days Initial EKG showed non-specific T wave changes and
cardiac troponin levels were elevated at 1.3
Coronary arteriography showed 90% stenosis ofthe LAD
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Patient Case (cont.)
Past medical history of DM 2, HTN, HLD, depression
and recurrent bronchitis. Patient is a long-standing
and ongoing tobacco user, and also has a positivefamily history of CAD
Home medications include ASA 81mg daily,
metoprolol XL 25mg daily, HCTZ 12.5mg daily,
lisinopril 20mg daily, cymbalta 60mg daily, apidra
on sliding scale, and lantus 25 units QHS
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NSTEMI
Defined as angina at rest for > 20 min without ST-
segment elevation, but with a rise in cardiac
markers
Pathophysiology
Abrupt in myocardial oxygen supply
Thrombus formation on an atherosclerotic plaque
Management depends on risk stratification
TIMI (Thrombolysis in Myocardial Infarction) risk score
DiPiro, Joseph T. "Chapter 24. Acute Coronary Syndromes." Pharmacotherapy: A Pathophysiologic Approach. New
York, N.Y: McGraw-Hill Medical, 2011. Access Pharmacy.http://www.accesspharmacy.com/content.aspx?aID=7972196
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Risk Stratification for NSTEMI
One point is assigned for each of the following riskfactors1. Age 65 years
2. 3 or more CHD risk factors: smoking, hypercholesterolemia,hypertension, diabetes mellitus, family history of prematureCHD death/events
3. Known CAD (50% stenosis of at least one major coronaryartery on coronary angiogram)
4. Aspirin use within the past 7 days5. 2 or more episodes of chest discomfort within the past 24 hrs
6. ST-segment depression 0.5 mm
7. Positive biochemical marker for infarction
Antman, EM, et al. The TIMI risk score for unstable angina/non-ST elevation MI: A method for prognostication andtherapeutic decision making. JAMA. 2000 Aug 16; 284(7):835-42
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Patient Case
BC, a 61 year-old female presents to the Onawa
ER with progressive substernal chest pain radiating
up into her neck and jaw over the past four daysMultiple episodes of chest pain
Initial EKG showed non-specific T wave changes and
troponin levels were elevated at 1.3Positive
cardiac markers
Coronary arteriography showed 90% stenosis of
the LADKnown CAD
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Patient Case (cont.)
Past medical history of DM 2, HTN, HLD, depressionand recurrent bronchitis. Patient is a long-standingand ongoing tobacco user, and also has a positive
family history of CAD 3 CHD riskequivalents
Home medications include ASA 81mg daily,metoprolol XL 25mg daily, HCTZ 12.5mg daily,lisinopril 20mg daily, cymbalta 60mg daily, apidraon sliding scale, and lantus 25 units QHSASAuse in the past 7 days
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TIMI risk score for NSTEMI
High-risk Medium-risk Low-risk
TIMI risk score TIMI risk Score TIMI risk score
57 points 34 points 02 points
TIMI risk scoreMortality, MI, or severe recurrent ischemic requiring urgent
target vessel revascularization
0/1 4.7%
2 8.3%
3 13.2%
4 19.9%5 26.2%
6/7 40.9%
DiPiro, Joseph T. "Chapter 24. Acute Coronary Syndromes." Pharmacotherapy: A Pathophysiologic Approach. New
York, N.Y: McGraw-Hill Medical, 2011. Access Pharmacy.
http://www.accesspharmacy.com/content.aspx?aID=7972196
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Invasive vs. Conservative strategy
Invasive (high-risk patients)
Antiplatelet and Anticoagulation therapies followed by
revascularization
Percutaneous Coronary Intervention (PCI)OR Coronary Artery Bypass Grafting (CABG)
Conservative (low-risk patients)
Antiplatelet and Anticoagulation therapies followed bywatchful waiting
Hoenig MR, Aroney CN, Scott IA. Early invasive versus conservative strategies for unstable angina and non-ST elevation
myocardial infarction in the stent era. Corchrane Database Syst review 2010; Mar 17; 3:CD004815.
Mahoney M, Jurkovitz CT, Chu H, et al. Cost and cost-effectiveness of an early invasive vs conservative strategy for the
treatment of unstable angina and non-ST-segment elevation myocardial infarction. JAMA2002; 288: 1851
8185.
Kushner FG, Hand M, Smith SC Jr, et al. 2009 Focused Updates: ACC/AHA Guidelines for the Management of Patientswith ST-Elevation Myocardial Infarction and ACC/AHA/SCAI Guidelines on Percutaneous Coronary
Intervention. 2009; 120: 22712306.
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Pharmacologic Management of
NSTEMI
Antiplatelet therapy
Aspirin162-325mg chewed immediately and 81-162mg
continued indefinitely
Clopidogrel600mg load for pts undergoing PCI and 75mgdaily continued for at least 12 months
+/- GP IIb/IIIa inhibitor (only for high risk patients who are
likely to undergo invasive strategy: elevated troponin or ST-
segment depression)o Eptifibatide (Integrilin) Two180mcg/kg boluses 10min apart,
followed by a 2mcg/kg/minute infusion for 72-96 hours
Quantitative comparison of clopidogrel 600 mg, prasugrel and ticagrelor, against clopidogrel 300 mg on major
adverse cardiovascular events and bleeding in coronary stenting: synthesis of CURRENT-OASIS-7, TRITON-
TIMI-38 and PLATO. Int J Cardiol.2012 Jul 12; 158(2): 181-5. Epub 2012 Jan 10.
Giugliano, Robert P. et al. Early versus Delayed, Provisional Eptifibatide in Acute Coronary Syndromes. N Engl J Med
2009; 360: 2176-2190
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Pharmacologic Management of
NSTEMI
Anticoagulation
Heparin60-70 units/kg IV bolus, followed by 12-15units/kg/hr continuous IV infusiono
DC Heparin when going to PCIOR
Enoxaparin1mg/kg Q12hrs
OR
Bivalirudinwith PCI, give 0.75mg/kg IV bolus,followed by continuous IV infusion 1.75mg/kg/hr. DC atend of procedure or continue for up to 4 hours
Enoxaparin vs Unfractionated Heparin in High-Risk Patients With NonST-Segment Elevation Acute Coronary
Syndromes Managed With an Intended Early Invasive Strategy. JAMA. 2004; 292(1): 45-54.
Stone GW, McLaurin BT, Cox DA, et al. Bivalirudin for patients with acute coronary syndromes. N Engl J Med2006;
355: 2203-2216.
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Pharmacologic Management of
NSTEMI
Beta blockers
Metoprolol IV 5mg given over 1-2 minutes Q5min X 3 doses;convert to PO 25-50mg Q6hrs
Nitrates
SL NTG Q5min X 3 doses
IV NTG for pts with refractory angina
o 5-10mcg/min IV; by 10mcg/min Q5min to a max of 100mcg/min
Morphine Sulfate
2-5mg IV Q5-30min PRN pain
DiPiro, Joseph T. "Chapter 24. Acute Coronary Syndromes." Pharmacotherapy: A Pathophysiologic Approach. New
York, N.Y: McGraw-Hill Medical, 2011. Access Pharmacy.http://www.accesspharmacy.com/content.aspx?aID=7972196
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Pharmacologic Management of
NSTEMI
ACE inhibitors
HOPE trialo Attenuates the ventricular remodeling process
o Early administration mortality in AMI patients
Statins
Helps with long-term atherosclerotic plaque stabilizationo High doses most beneficial (treat to LDL < 70 mg/dL)
Effects of an Angiotensin-ConvertingEnzyme Inhibitor, Ramipril, on Cardiovascular Events in High-Risk Patients. N Engl
J Med 2000; 342: 145-153
Daga, Lal C., Upendra Kaul, and Aijaz Mansoor. "Approach to STEMI and NSTEMI." J Assoc Physicians India. 2011
Dec; 59 Suppl: 19-25
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BC received
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Patient Case
Heparin 6000 unit IV bolus (70 units/kg), followed by
1200 units/hr (14 units/kg/hr) continuous IV infusion*
ASA 162mg daily*
Clopidogrel 300mg load, followed by 75mg daily*
Lisinopril 10mg daily
Metoprolol XL 25mg BID
Morphine 2mg IV Q2hrs PRN NTG SL 2 tablets relieved symptoms
NTG IV cont. 250mL bottle titrated to pain free*
Simvastatin 80mg initially, followed by 40mg daily
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Patient Case
Procedure
PCI w/ placement of drug eluting stent in LAD
Medications (given intra-arterial)
Heparin 3000 units
NTG 600mcg initially, 400mcg after 30min
Bivalirudin 65mg, or 13 mL IV bolus (0.75mg/kg),
followed by continuous IV infusion of 30mL/hr
(1.75mg/kg/hr). DCd at end of procedure
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STEMI
Defined as prolonged chest discomfort unrelieved
by SL NTG with ST-segment elevation on EKG and a
rise in cardiac markers
Pathophysiology
Total or near-total thrombotic occlusion of a coronary
artery
Management involves immediate reperfusiontherapy (PCI preferred)
Door-to-balloon time is 90 minutes
DiPiro, Joseph T. "Chapter 24. Acute Coronary Syndromes." Pharmacotherapy: A Pathophysiologic Approach. New
York, N.Y: McGraw-Hill Medical, 2011. Access Pharmacy.http://www.accesspharmacy.com/content.aspx?aID=7972196
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Fibrinolytic therapy in STEMI
If > 90 minutes from nearest cardiac cath lab,fibrinolytic therapy can risk of mortality
Door-to-needle time is 30 minutes
Fibrinolyticsmay be administered if patient presentswithin 12 hrs of symptom onset
t-PA (alteplase)
r-PA (retaplase)
TNK (tenecteplase)
Shown to open occluded artery in 60-90% of pts and mortality by 20%
Single-bolus tenecteplase compared with front-loaded alteplase in acute myocardial infarction: theASSENT-2 double-blind randomised trial. Lancet. 1999 Aug 28; 354(9180): 716-22.
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Pharmacologic Management of
STEMI
Antiplatelet therapy
Aspirin162-325mg chewed immediately and 81-
162mg continued indefinitely Clopidogrel300mg load for pts undergoing PCI or
receiving fibrinolytic and 75mg daily continued for at
least 14 days and up to12 months
Generally do not use GP IIb/IIIa inhibitors in the settingof STEMI due to no improvement in outcomes and an
increased risk of bleeding
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Pharmacologic Management of
NSTEMI
Anticoagulation
With fibrinolytic Heparin60 units/kg IV bolus, followed by 12 units/kg
continuous IV infusion
OR
Enoxaparin30mg IV bolus, followed by 1mg/kg Q12hrs
Without fibrinolytic Heparin60-70 units/kg IV bolus, followed by 12-15
units/kg continuous IV infusion
OR
Enoxaparin1mg/kg Q12hrs
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Pharmacologic Management of
STEMI
Beta blockers
Nitrates
Morphine Sulfate
ACE inhibitors
Statins
Dosing similar to
NSTEMI
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References
1. DiPiro, Joseph T. "Chapter 24. Acute Coronary Syndromes." Pharmacotherapy: APathophysiologic Approach. New York, N.Y: McGraw-Hill Medical, 2011. Access Pharmacy.http://www.accesspharmacy.com/content.aspx?aID=7972196
2. Antman, EM, et al. The TIMI risk score for unstable angina/non-ST elevation MI: A methodfor prognostication and therapeutic decision making. JAMA. 2000 Aug 16; 284(7):835-42.
3. Hoenig MR, Aroney CN, Scott IA. Early invasive versus conservative strategies for unstableangina and non-ST elevation myocardial infarction in the stent era. Corchrane Database Systreview 2010;Mar 17;3:CD004815.
4. Mahoney M, Jurkovitz CT, Chu H, et al. Cost and cost-effectiveness of an early invasive vsconservative strategy for the treatment of unstable angina and non-ST-segment elevationmyocardial infarction. JAMA2002;288:18518185.
5. Kushner FG, Hand M, Smith SC Jr, et al. 2009 Focused Updates: ACC/AHA Guidelines forthe Management of Patients with ST-Elevation Myocardial Infarction and ACC/AHA/SCAIGuidelines on Percutaneous Coronary Intervention. 2009;120:22712306.
6. Quantitative comparison of clopidogrel 600 mg, prasugrel and ticagrelor, againstclopidogrel 300 mg on major adverse cardiovascular events and bleeding in coronarystenting: synthesis of CURRENT-OASIS-7, TRITON-TIMI-38 and PLATO. Int J Cardiol.2012Jul 12;158(2):181-5. Epub 2012 Jan 10.
http://www.accesspharmacy.com/content.aspx?aID=7972196http://www.accesspharmacy.com/content.aspx?aID=7972196http://www.accesspharmacy.com/content.aspx?aID=7972196http://www.accesspharmacy.com/content.aspx?aID=79721968/10/2019 Stemi vs Nstemi
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