ACS Flashcards
Clopidogrel
Plavix®
Prasugrel
Effient®
Ticagrelor
Brilinta
Unfractionated Heparin
UFH
Fondaparinux
Arixtra®
Bivalirudin
Angiomax®
Tirofiban
Aggrastat®
Eptifibatide
Integrilin®
Abciximab
Reopro®
Ticlopidine
Ticlid®
Omeprazole
Prilosec®
Metoprolol tartrate
Lopressor®
Metoprolol succinate
Toprol XL®
Atenolol
Tenormin®
Carvedilol
Coreg®
Ischemia
Reduction of blood supply or increase in oxygen demand of myocardium
Infarction
Interruption of blood flow that leads to necrosis of myocardium
What is ACS?
Spectrum of conditions that result from myocardial ischemia and/or infarction
Atherothrombosis
- Disruption of an atherosclerotic plaque
- Results in thrombosis
- Reduced myocardial perfusion → infarction (death
STEMI
Complete artery occlusion by the thrombus
UA/NSTEMI
Incomplete artery occlusion by the thrombus
Risk factors of ACS: Modifiable
Physical Inactivity
Obesity - (especially abdominal)
Smoking- counsel
HTN
Hyperlipidemia
Risk Factors for ACS: Non-modifiable
Age
Male gender <55
Family history of premature CHD
History of CAD, including MI
DM
Clinical Presentation: Classic
- Chest discomfort, squeezing sensation
- Chest pressure can radiate to shoulder, left arm, back or jaw
Clinical Presentation: Rest
occurs at rest and lasts > 20 min
Clinical Presentation: New-onset
severe (marked limitation of physical activity)
Clinical Presentation: Increasing
more frequent, longer in duration or higher intensity
Clinical Presentation: Atypical
Epigastric pain Nausea and vomiting Diaphoresis Shortness of breath Light-headedness, syncope Weakness
Atypical sx more common in women, elderly (≥ 75 yo) & pts with DM, CKD, dementia
Diagnosis: ACS
Electrocardiogram changes (EKG, ECG)
Positive cardiac biomarkers (measured x 3)
- > Creatinine Kinase (CK)
- > Creatinine Kinase – MB isoenzyme (CK-MB)
- > Troponin I/T – Biomarker of CHOICE
Diagnosis: ACS : Gold standard
Cardiac Catheterization
–>Gold standard for diagnosis
Diagnosis: ACS: Biomarker of choice
Troponin I/T
measured x 3
Classification of ACS: STEMI
No different in the extent of symptoms- Chest Pain or Severe Chest Paint.
Symptoms: Present
EKG Change: ST Elevation
Biomarkers: High
Classification of ACS: NSTEMI
No different in the extent of symptoms- Chest Pain or Severe Chest Paint.
Symptoms: Present
EKG Changes:
ST segment depression or T wave inversion
Biomarkers Medium
Classification of ACS: UA
No different in the extent of symptoms- Chest Pain or Severe Chest Paint.
Symptoms: Present
EKG Changes: ST segment depression or T wave inversion
Biomarkers: No Elevation
Initial Therapy: STEMI
Aspirin Nitroglycerin UFH/LMWH \+/-Beta-blocker (IV) \+/-Morphine
Initial Therapy: STEMI
acronym
M – Morphine (+/-) O – Oxygen (+/-) N – Nitroglycerin A – Aspirin A - Anticoagulant
Initial Therapy: Asprin
First dose 162-325 mg chewed
Not EC
Initial Therapy: Nitroglycerin (NTG)
Outside Hospital
Call EMS if angina not relieved 5 min after 1 dose (0.4 mg sublingual)
Initial Therapy: Nitroglycerin (NTG)
In Hoptial
EVERYONE GETS AN ORDER FOR NTG AND RX
Sublingual NTG can be repeated q 5 min x 3 doses
Consider IV NTG if angina not relieved
Initial Therapy: Anticoagulation
Unfractionated heparin (UFH) – preferred
Enoxaparin as alternative to UFH
Reperfusion Therapy
Goal: re-open partially or completely occluded coronary artery
Re-establish blood flow
Improve perfusion to the affected myocardial tissue
Initial Therapy: Beta-blocker (+/-)
IV beta-blockers upon presentation in pts who are hypertensive or ongoing ischemia and do NOT have:
- Signs of HF
- PR interval > 0.24 seconds
- Heart block
- Active asthma/COPD
Initial Therapy: Morphine (+/-)
Dosing and indication
For continued chest pain***
Dose: 2-4 mg IV repeated q 5-15 min prn
Reperfusion Therapy: Non-Pharmacologic
Percutaneous Coronary Intervention (PCI)
- -Invasive procedure – NOT surgery
- -Mechanical revascularization - dilation of the coronary artery – “stenting”
Reperfusion Therapy: Pharmacologic
Fibrinolytic Therapy—NON PREFERRED - BREAK CLOT
Timing of Reperfusion Therapy: Door to Balloon Time
Door to Balloon Time”: < 90 min
Target time from hospital presentation to PCI
HAVE 90MIN TO GET THEM TO CATH LAB
Timing of Reperfusion Therapy: Door to Needle Time
Door to Needle Time”: < 30 min
Target time from hospital presentation to fibrinolytic
WHY PCI preferred over fibrinolytics?
↓ Mortality rate
↓ Risk of stroke (ICH) & major bleeding
Fibrinolytic Therapy
STEPTOKINANCE IS NOT FIBRIN SPECIFIT—INCREASES SYSTEMIC BLEEDING
Fibrinolytic Therapy: Indications
STEMI patients with:
Symptom onset within 12 hrs AND
ST-elevation in at least 2 contiguous EKG leads
Indicated for STEMI patients at non-PCI hospitals
Age < 75 (controversial)
When shouldn’t Fibrinolytic therapy be used?
Fibrinolytic therapy NOT recommended in UA/NSTEMI patients!!
Absolute Contraindications – to Fibrinolytic therapy
Previous intracranial hemorrhage (at ANY time)***
Ischemic stroke within 3 months**
Relative Contraindications – more than one Relative ContraIND is Absolute—Risk for Intracranial Hemorrhage
Fibrinolytic therapy
Uncontrolled HTN (SBP > 180 or DBP >110 mmHg)
History of stroke > 3 months
Current use of anticoagulants
Age > 75
Fibrin-Specific Agents
Alteplase (tPA): Activase ®
Reteplase (rPA): Retavase ®
Tenecteplase (TNK-tPA):TNKase ®
Alteplase (tPA): Activase ®
Dosage*****
15 mg IV bolus followed by
0.75 mg/kg (max 50 mg) IV infusion over 30 min followed by 0.5 mg/kg (max 35 mg) IV over 1 hr (100 mg TOTAL)
Choice of Fibrinolytic Agent
Fibrin-specific agents more effective
Alteplase, reteplase, tenecteplase
—Preferred agents as per ACC/AHA guidelines
Fibrinolytic Agent: Risk of bleeding
ICH risk higher with fibrin-specific agents
Systemic bleeding higher with streptokinase
Fibrinolytic Agent : ADR or Side Effects
SE:
Bleeding: Intracranial hemorrhage (ICH): largest risk
Reperfusion arrhythmia: usually self limiting
Antiplatelet Therapy with Fibrinolytics:
Loading Dose
Aspirin 162-325 mg X 1 AND
Clopidogrel
Pts ≤ 75 yo: 300 mg x 1
Pts > 75 yo: no LD, give 75 mg
Antiplatelet Therapy with Fibrinolytics:
Maintenance Dose
Aspirin 81 to 325 mg po daily indefinitely
–>81 mg dose preferred ( hiegher doses are not more effective)
Clopidogrel 75 mg po daily for at least 14 days and up to 1 year
Anticoagulation with Fibrinolytics: Indications
Anticoagulant tx for a min of 48 hrs and preferably for the duration of hospitalization or up to 8 days
If anticoagulant tx continued > 48 hrs, therapies other than UFH recommended due to risk of HIT**
Enoxaparin is preferred anticoagulant in patients receiving fibrinolytic therapy**
Anticoagulation with Fibrinolytics
Enoxaparin (Lovenox®)
Unfractionated heparin
(UFH)
Fondaparinux (Arixtra®)
Enoxaparin (Lovenox®)- Preferred
Dosing for anticoagulation
30 mg IV bolus followed immediately by 1 mg/kg sub cut q12h***
Age ≥ 75 yo, no bolus, 0.75 mg/kg subcut q12h
CrCl < 30 ml/min: 1 mg/kg subcut q24h- when to RENAL DOSE
Unfractionated heparin
(UFH)
Dosing for anticoagulation
60 units/kg IV bolus (max 4000 Units) followed by 12 units/kg/hr (max 1000 Units/hr)
Adjusted to maintain aPTT 1.5 - 2 X control
Fondaparinux (Arixtra®)
2.5 mg IV, then 2.5 mg subcut daily in 24 hrs
Contraindicated if CrCl < 30 ml/min– Can give in HISTORY OF HIT
Stenting “PCI”
Bare metal stent (BMS)
Drug-eluting stents (DES)
- Paclitaxel
- Sirolimus
- Everolimus
- Zotarolimus
Restenosis
blood vessel grow over the stent and cause a blockage.
PCI indications
Don’t know
Primary PCI:
Decreases Chance of Intracranial hemorrhage.
PCI timing
should be performed if immediately available (within 90 min of hospital presentation)
Should be performed within 12 hrs of symptom onset
Complications of PCI:
Contrast - Induced nephropathy
PCI = IV dye administration
High risk patients:
- Advanced age >75 years!!!
- Chronic kidney disease (CKD)
- DM
- Heart failure
How to prevent In-stent restenosis & rethrombosis?
Prevent with dual antiplatelet therapy (DAPT)
Prevention of Contrast-induced Nephropathy
- Risk stratification & monitoring
BUN/SrCr daily after PCI - Hydration (NSS) pre- and post-procedure (#1 way to prevent contrast neuropathy)
+/- N-acetylcysteine (Mucomyst®)
+/- Sodium bicarbonate
- Concomitant medication assessment
- >Hold metformin at time of PCI, then x 48 hrs
- >Nephrotoxic drugs (ACE-I, ARBS, diuretics