Clinical Pharmacology of Acute Coronary Syndrome Flashcards

1
Q

Are acute coronary syndromes stable or unstable?

A

Unstable

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2
Q

Describe unstable angina.

A

Unpredictable
No trigger

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3
Q

What is NSTEMI?

A

Non-ST elevated myocardial infarction

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4
Q

What is STEMI?

A

ST- elevated myocardial infarction

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5
Q

Which is a clincial emergency- STEMI or NSTEMI?

A

STEMI

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6
Q

Why does unstable angina occur?

A

A plaque has ruptured causing partial occlusion of the vessel.

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7
Q

Describe pain felt in unstable angina patients.

A

Pain can occur at rest
Can progress rapidly over a short period of time

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8
Q

What happens during a NSTEMI?

A

The plaque ruptures and thrombus formation causes partial occlusion of the vessel.
This results in injury an infarct to the subendocardial myocardium.

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9
Q

What happens during a STEMI?

A

Complete occlusion to a vessel.
Results in transmural injury and infarction to the myocardium

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10
Q

What is a STEMI reflected by?

A

An elevated ST segment
Rise in troponin

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11
Q

What are the goals of therapy for unstable angina and NSTEMI?

A

Increase myocardial oxygen supply
Decrease myocardial oxygen demand

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12
Q

How can therapy increase myocardial oxygen supply?

A

Coronary vasodilation
Correct hypoxaemia
Stop platelet aggregation

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13
Q

How can therapy decrease myocardial oxygen demand?

A

Reduce heart rate
Reduce blood pressure (afterload)
Reduce preload
Reduce contractility and wall stress

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14
Q

What is the pneumonic for remembering the drugs involved t=in the treatment of unstable angina/ NSTEMI?

A

M - Morphine
O – Oxygen
N - Nitrates
A - Aspirin
C/T/P - Clopidogrel/Ticagrelor/Prasugrel
+ Fondaparinux (OASIS-6 trial)

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15
Q

Which drugs can decrease myocardial oxygen demand.

A

Bisoprolol (beta blocker)
Nitrates (not calcium channel blockers)
Ramipril (ace inhibitor)
Atorvastatin

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16
Q

What are the three key antiplatelet drugs?

A

Aspirin
Clopidogrel/Ticagrelor/Prasugrel
Fondaparinux

17
Q

What does aspirin do?

A

Thromboxane-A2 inhibitor
Inhibit platelet activation and recruitment

18
Q

What do Clopidogrel/Ticagrelor/Prasugrel do?

A

Inhibits ADP activation of P2Y12 receptor

19
Q

What does fondaparinux do?

A

Reduces clots

20
Q

What is the goal of STEMI therapy?

A

To unclog the artery

21
Q

What are the two ways to unlock an artery when it comes to STEMI?

A

Emergency angioplasty
Thrombolysis

22
Q

RECAP- when should thrombolysis be used instead of angioplasty?

A

If you cannot get angioplasty in the next two hours.

23
Q

Which thrombolytic agent is often used?

A

Recombinant tissue plasminogen activator (rtPA)

24
Q

How does recombinant tissue plasminogen activator (rtPA) work?

A

Converting plasminogen to plasmin

25
Q

What does plasmin do?

A

Plasmin lyses clot by breaking down fibrinogen and fibrin within a clot

26
Q

What do fibrin specific agents do?

A

Catalyse conversion of plasminogen to plasmin in absence of fibrin

27
Q

Name two fibrin specific agents.

A

Alteplase
Tenecteplase

28
Q

Give an example of a non-fibrin specific agent.

A

Streptokinase

29
Q

What do non-fibrin specific agents do?

A

Catalyse systemic fibrinolysis

30
Q

What would contradict doing thrombolysis?

A

Prior intracranial haemorrhage
Known intracranial lesion
Ischaemic stroke within 3 months
Suspected aortic dissection
Active bleeding
Significant closed head trauma (<3 months)