Clinical Pharmacology of Acute Coronary Syndrome Flashcards
Are acute coronary syndromes stable or unstable?
Unstable
Describe unstable angina.
Unpredictable
No trigger
What is NSTEMI?
Non-ST elevated myocardial infarction
What is STEMI?
ST- elevated myocardial infarction
Which is a clincial emergency- STEMI or NSTEMI?
STEMI
Why does unstable angina occur?
A plaque has ruptured causing partial occlusion of the vessel.
Describe pain felt in unstable angina patients.
Pain can occur at rest
Can progress rapidly over a short period of time
What happens during a NSTEMI?
The plaque ruptures and thrombus formation causes partial occlusion of the vessel.
This results in injury an infarct to the subendocardial myocardium.
What happens during a STEMI?
Complete occlusion to a vessel.
Results in transmural injury and infarction to the myocardium
What is a STEMI reflected by?
An elevated ST segment
Rise in troponin
What are the goals of therapy for unstable angina and NSTEMI?
Increase myocardial oxygen supply
Decrease myocardial oxygen demand
How can therapy increase myocardial oxygen supply?
Coronary vasodilation
Correct hypoxaemia
Stop platelet aggregation
How can therapy decrease myocardial oxygen demand?
Reduce heart rate
Reduce blood pressure (afterload)
Reduce preload
Reduce contractility and wall stress
What is the pneumonic for remembering the drugs involved t=in the treatment of unstable angina/ NSTEMI?
M - Morphine
O – Oxygen
N - Nitrates
A - Aspirin
C/T/P - Clopidogrel/Ticagrelor/Prasugrel
+ Fondaparinux (OASIS-6 trial)
Which drugs can decrease myocardial oxygen demand.
Bisoprolol (beta blocker)
Nitrates (not calcium channel blockers)
Ramipril (ace inhibitor)
Atorvastatin