Angina 1 Flashcards

1
Q

what is angina?

A

a clinical syndrome characterized by discomfort in the chest, jaw, shoulder, back and or arm

1) typically aggravated by exertion or emotional stress
2) relieved by nitroglycerin

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2
Q

what is the drug that can be used as an alternative to aspirin?

A
  1. ticlopidine
  2. clopidogrel
  3. prasugrel
  4. ticagrelor
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3
Q

what are the 4 characteristics of ticlopidine?

A
  1. thienopyridine derivative that inhibits platelet aggregation induced by adenosine diphophate
  2. also reduces blood viscosity by decreasing plasma fibrinogen and increases red cell deformability
  3. has no shown a decrease in adverse events in pts with stable angina
  4. induces neutropenia and rarely TTP
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4
Q

how is clopidogrel different from ticlopidine?

A

has greater antithrombotic effect than ticlopidine

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5
Q

what is the mech of ticlopidine?

A

selectively and irreversible inhibits the binding of adenosine diphosphate to its platelet receptors
–> this blocks adenosine diphosphate - dependent activation of the glycoprotein IIb/IIIa complex

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6
Q

what is the mech of prasugrel?

A

irreversibley binds to the P2Y12 receptor –> it is a G protein coupled chemoreceptor for ADP

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7
Q

what is ticagrelor?

A
  1. similar in structure to adenosine, like the thienopyridiens, it blocks ADP receptors
    - -> its binding site is different from ADP, it is a reversible blockade
  2. does NOT require hepatic activation thus can be used for pt with liver failure
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8
Q

what is dipyridamole?

A

a pyrimido-pyrimidine derivative that increases intracellular platelet cyclic AMP

1) inhibits phosphodiesterase
2) activates adenylate cyclase
3) inhibits uptake of adenosine from vascular endothelium and RBCs

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9
Q

what caution is needed when dipyridamole?

A

use is limited b/c it vasodilates coronary arteries which can enhance exercise induced ischemia

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10
Q

what is cilostazol?

A

a quinolinone derivative that inhibits cellular phosphodiesterase
–> increase cAMP –> inhibits platelet aggregation

  • also causes vasodilation which is felt to be the cause of the increased morbidity and mortality seen in heart failure patients
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11
Q

what are the metabolic effects of ishcemia?

A

elevated extracellular potassium is the most important contributor to the electrophysiologic changes of ischemia

  • -> increased cell membrane permeability to potassium during the plateau phase of the action potential results in the increased K+ leak outwards
  • -> lactate and phosphate follow the potassium out
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12
Q

what are the 3 metabolic effects of ischemia?

A
  1. sympathetic activation (triggered by myocardial ischemia) increases circulating free fatty acids
  2. liposomal phospholipase is activated breaking down membrane phospholipids
  3. long-chain fatty acids accumulate in the intracellular space
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