Therapeutics of Coronary Artery Disease Flashcards
pathophysiology and diagnosis of a STEMI
- Total Occlusion of Coronary Artery -> Unstable plaque causing infarction
- EKG Manifestations: ST segment elevation, NEW left bundle branch block (LBBB)
- Signs/Symptoms: Chest pain, Intense sweating, N/V
- Presence of biomarkers
patients who are candidates for PCI
- First medical contact device time ≤ 90
- Superior to fibrinolytic therapy if availability of skilled interventional cardiology department
- High Risk of Mortality: Cardiogenic shock or severe HF must get PCI right away
- High Bleed risk
- Diagnosis of STEMI in doubt
patients who are candidates for Fibrinolytics
- Administer within 30 min of arrival if first medical contact device time > 120 min
- More appropriate option in institutions with lack of availability of skilled interventional cardiology department
- Low bleed risk
pharmacotherapeutics for PCI
- antiplatelet
- anticoagulation
What are the antiplatelets for PCI?
- ASA (if not already given)
- P2Y12 receptor inhibitor
- GP IIb/IIIa Inhibitors
P2Y12 receptor inhibitors for PCI
- Clopidogrel
- Prasugrel
- Ticagrelor
- Cangrelor
Clopidogrel dose for PCI
600 mg LD
Prasugrel dose for PCI
60 mg
Ticagrelor dose for PCI
180 mg
Cangrelor dose for PCI
30 mcg/kg IV bolus prior to PCI followed immediately by an infusion of 4 mcg/kg/minute continued for at least 2 hours or for the duration of the PCI
What are the anticoag therapies for PCI?
- UFH
- Enoxaparin
- Fondaparinux
- Argatroban
- Bivalirudin
UFH dose for PCI and Fibrinolysis
- After PCI, a weight-adjusted, continuous, IV infusion is administed for 48 hours or until revascularization
- 12 U/kg/hour (maximum 1000 U/hour)
- aPTT of 1.5 to 2.0 times control
- Drug of choice when renal function is unknown
Enoxaparin dose for PCI and Fibrinolysis
- IV bolus, followed in 15 minutes by SQ injection for the duration of hospitalization, up to 8 days or until revascularization
- If age < 75 years: 30-mg IV bolus, followed in 15 min by 1 mg/kg SQ every 12 hours (maximum 100 mg for the first 2 doses)
- If age ≥ 75 years: no bolus, 0.75 mg/kg SQ every 12 hours (maximum 75 mg for the first 2 doses)
- Regardless of age, if CrCl < 30 mL/min: 1 mg/kg SQ every 24 hours
- Consider using this in pts who has history of HITT
Fondaparinux dose for PCI and Fibrinolysis
- NOT recommended as sole anticoagulant for PCI
- Increased risk of catheter thrombosis when used as monotherapy
- Contraindicated in patients with CrCl < 30 mL/min
- Consider using this in pts who has history of HITT
Argatroban use for PCI and Fibrinolysis
- Useful when anticoagulation needs to be extended past PCI
- Dose adjust in hepatic dysfunction
- Useful option in patients with renal dysfunction
Bivalirudin dose for PCI and Fibrinolysis
- Monotherapy anticoagulation in preference to the combination of UFH and a GP IIb/IIIa receptor antagonist
- Monotherapy anticoagulation
- 0.75-mg/kg IV bolus, then 1.75–mg/kg/hour IV infusion
- if CrCl < 30 ml/min = 1 mg/kg/hour
- Consider using this in pts who has history of HITT
When to use Glycoprotein IIb/IIIa Receptor Antagonists in PCI?
- begin treatment with an IV GP IIb/IIIa receptor antagonist at the time of primary PCI in selected patients with STEMI who are receiving unfractionated heparin (UFH)
- Used in special cases: Thrombectomy, High-troponin, Complex lesions, Large thrombi, “Bail-out” Therapy
What are the Glycoprotein IIb/IIIa Receptor Antagonists for PCI?
- Abciximab
- Tirofiban
- Eptifibatide
Abciximab dose for PCI
0.25 mg/kg IV bolus, then 0.125 mcg/kg/min (maximum 10 mcg/min) x 12 hours
Tirofiban dose for PCI
- 25 mcg/kg IV bolus, then 0.15 mcg/kg/min x 18-24 hours
- In patients with CrCl ≤ 60 mL/min, reduce maintenance dose by 50% x 18 hours
- Contraindicated in patients on hemodialysis
Eptifibatide dose for PCI
- 180 mcg/kg IV bolus [max: 22.6 mg] (repeat 10 minutes later), then 2 mcg/kg/min (max: 15 mg/hour) x 18-24 hours
- n patients with CrCl < 50 mL/min, reduce maintenance dose by 50%
- Contraindicated in patients on hemodialysis
Therapy for fibrinolysis
- fibrinolytics
- antiplatelets
- anticoags
fibrinolytics
- Alteplase
- Reteplase
- Tenecteplase
What are the antiplatelet therapies for PCI?
- ASA
- P2Y12 Receptor Antagonist
ASA for fibrinolysis
325mg before fibrinolytics and then ASA 81mg once daily thereafter
P2Y12 Receptor Antagonist for fibrinolysis
Clopidogrel
Clopidogrel dose for fibrinolysis
- 300 mg loading dose for patients ≤75 years of age
- 75 mg dose for patients >75 years of age (don’t get a loading dose because it increases risk for bleeding)
GP IIb/IIIa Antagonists in fibrinolysis
not recommended -> Combination of IIb/IIIa antagonist and fibrinolysis associated with high rates of bleeding and ICH
Anticoagulation During Fibrinolysis
- UFH
- Enoxaparin
- If history of HITT -> Fondaparinux, Bivalirudin
- Patients with STEMI undergoing reperfusion with fibrinolytics therapy should receive anticoagulant therapy for a minimum of 48 hours, and preferably for the duration of hospitalization, up to 8 days or until revascularization if performed.
TIMI Flow Grade
- 0: No perfusion (no antegrade flow beyond occlusion)
- 1: Penetration without perfusion (contrast material passes beyond the area obstruction but fails to opacify the entire coronary bed distal to obstruction)
- 2: Partial reperfusion (delayed flow with complete filling of distal area)
- 3: Complete perfusion
TIMI Risk Score: factors
- for NSTE-ACS
- ≥65 y of age
- ≥3 risk factors for CAD
- Prior coronary stenosis ≥50%
- ST deviation on ECG
- ≥2 angina events in prior 24 hours
- Use of aspirin in prior 7 days
- Elevated cardiac biomarkers
TIMI Risk Score: percentages
- 0-1: 4.7%
- 2: 8.3%
- 3: 13.2%
- 4: 19.9%
- 5: 26.2%
- 6-7: 40.9%
Relative contraindications for fibrinolytic therapy
- History of chronic, severe, poorly controlled HTN
- Severe uncontrolled HTN on presentation: SBP > 180 mm Hg; DBP > 110 mm Hg
- Traumatic or prolonged (> 10 min) CPR
- Major surgery ( < 3 weeks)
- Recent internal bleeding (within 2-4 weeks)
- Prior ischemic stroke in > 3 months
- Dementia or any known intracranial pathology not covered in absolute contraindications
- Non-compressible vascular punctures
- Pregnancy
- Active peptic ulcer disease (PUD)
- Current use of anticoagulants (Higher INR = Higher risk)
Absolute contraindications for fibrinolytic therapy
- Active bleeding or bleeding diathesis (Excluding menses)
- Any prior intracranial hemorrhage (ICH)
- Ischemic stroke within 3 months (EXCEPT acute ischemic stroke within 4.5 hours)
- Structural cerebrovascular lesion
- Presence of malignant intracranial neoplasm
- Significant closed head or facial trauma within last 3 months
- Intracranial or intraspinal surgery within 2 months
- Severe uncontrolled HTN that is unresponsive to emergency therapy
- Aortic dissection
Monitoring of Perfusion After Fibrinolysis
- Monitor over 1 - 3 hours after initiation of fibrinolytic therapy
- Pattern of ST elevation
- Cardiac rhythm
- Clinical symptoms
for Fibrinolysis, what are we looking for in pattern of ST elevation?
reduction of at least 50% of the initial ST-segment elevation injury pattern on a follow-up ECG
for Fibrinolysis, what are we looking for in cardiac rhythm?
Maintenance or restoration of hemodynamic and/or electrical stability
for Fibrinolysis, what clinical symptoms are we looking for?
- want to monitor for Intracranial Hemorrhage (ICH)
- Usually occurs within first 24 hours of therapy
- Fibrinolytic, antiplatelet, and anticoagulant therapies should be discontinued until brain imaging scan shows no evidence of ICH
What are the presenting features of ICH?
- Acute change in level of consciousness
- Focal neurological deficits
- New/severe headache
- Nausea/vomiting
- Seizures
- Acute hypertension
- Drowsiness
- Coma
What is NSTE-ACS?
- Partial thrombus occlusion of coronary vasculature
- Plaque stability dictates whether patient will have ischemic or infarction
What falls under NSTE-ACS?
- Unstable Angina (UA)
- Non ST segment Elevation MI (NSTEMI)
Unstable Angina (UA)
- ST segment depression
- Absence of ST segment elevation
- Absence of Biomarkers
Non ST segment Elevation MI (NSTEMI)
- ST segment depression
- Absence of ST segment elevation
- Presence of Biomarkers
Ischemia-Guided Strategy
- Patients receive optimal anti-ischemic/anti-thrombotic medical therapy
- Not getting angiography
- Criteria: Low TIMI risk score (0-1), Low risk Tn (-) patients
- MONA-BAAS
- Maximize angina treatment
- In patients with NSTE-ACS (i.e., without ST elevation), IV fibrinolytic therapy should not be used!!!!!
Antiplatelet for Ischemia-Guided Strategy
- Clopidogrel: 300-600 mg LD
- Ticagrelor: 180 mg LD
Anticoag for Ischemia-Guided Strategy
- UFH
- Enoxaparin
- Dalteparin
- Fondaparinux
UFH dose for Ischemia-Guided Strategy
- Initial loading dose 60 IU/kg (max 4,000 IU) with initial infusion 12 IU/kg/hour (max 1,000 IU/hour)
- Use for 48 hours or until PCI is performed; aPTT of 1.5 to 2.0 times control
Enoxaparin dose for Ischemia-Guided Strategy
- IV bolus, followed by SQ injection for the duration of hospitalization, up to 8 days or until PCI performed
- 30-mg IV bolus then 1 mg/kg SQ every 12 hours
- Regardless of age, if CrCl < 30 mL/min -> 1 mg/kg SQ every 24 hours
Dalteparin dose for Ischemia-Guided Strategy
120 units/kg body weight SQ (maximum dose: 10,000 units) every 12 hours for up to 5-8 days
Fondaparinux dose for Ischemia-Guided Strategy
- Initial dose 2.5 mg IV, then 2.5 mg SQ daily starting the following day, for the durations of hospitalization, up to 8 days or until revascularization
- not recommended for monotherapy
- CI with CrCl < 30 mL/min
Early Invasive Strategy
MONA-BAAS