Therapeutics I Exam V (CAD + HF) Flashcards
Acute coronary syndrome, chronic coronary syndrome, Ischemic Heart disease, HFrEF, and HFpEF (293 cards)
What is a STEMI?
This is an ST-elevated myocardial infarction
What are the two ways in which revascularization is performed in acute coronary syndrome?
- Cardiac catheterization with PCI
- Coronary artery bypass grafting (CABG)
What is the goal of a stress test?
The goal of a stress test via both exercise and pharmacologic intervention is to increase heart rate and see if there are any EKG changes.
Which cardiac tests allows for an estimation of left ventricular ejection fraction?
Echocardiogram
Define coronary artery disease (CAD)?
CAD is a condition where the arteries that supply blood to the heart become narrowed or blocked. This change is typically due to plaque accumulation.
What are the three disease states are encompassed into coronary artery disease (CAD)?
Ischemic heart disease
Stable/ chronic coronary artery disease
Unstable/acute coronary artery disease
What is acute coronary syndrome (ACS)?
A spectrum of clinical syndromes associated with the rupture of an atherosclerotic plaque and/or partial or complete thrombosis of a coronary artery.
Acute coronary syndrome (ACS) presents clinically as what 3 different things?
Unstable angina, NSTEMI, and STEMI
T or F: Acute coronary syndrome is a medical emergency.
True!
What is angina?
Angina is pain, discomfort, or pressure localized in the chest that is caused by ischemia to the heart muscle.
Are STEMIs or NSTEMIs more prevelant?
NSTEMIs are more prevalent (70%)
For unstable angina in acute coronary syndrome, what biomarkers are present?
No biomarkers will be positive if unstable angina is the diagnosis. Only STEMI and NSTEMI have positive biomarkers.
Myocardial oxygen demand is affected by what 3 things?
Heart rate, contractility, and intra-myocardial wall tension during systole.
Adenosine is a potent _______________.
Vasodilator
The endothelium of blood vessels secretes _________ and ___________.
Nitric oxide and Prostacyclins
Carbon dioxide is a vaso___________.
Vasodilator
What is the difference between stable and unstable plaque?
Stable plaques are characterized by a thick fibrous cap and a low lipid content, while unstable plaques, also known as vulnerable plaques, have a thin fibrous cap and a high lipid content.
Once a plaque ruptures, what happens to that floating plaque?
A thrombus will form on top of the ruptured plaque and exposure to collagen and tissue factor promotes platelet adhesion to the plaque.
_______% of acute coronary syndrome cases are due to plaque rupture.
90%
What are modifiable risk factors for plaque rupture leading to an acute coronary event?
Smoking, high cholesterol, and diabetes
What are non-modifiable risk factors for plaque rupture leading to an acute coronary event?
Cap fatigue, atheromatous core size, cap thickness, cap inflammation, homocysteine, impaired fibrinolysis, and fibrinogen.
What is a myocardial infarction?
An MI is impairment of blood flow due to a coronary occlusion. The coronary occlusion arises from a ruptured atherosclerotic plaque that becomes a thrombosis.
What are the biochemical damages that occur to the heart with a myocardial infarction?
- loss of mitochondrial ATP
- Increase in anaerobic glycolysis accumulating H+ and lactate
- Tissue acidosis
What are the functional damages that occur to the heart with a myocardial infarction?
- rapid loss of contractile function in affected area
- electrical abnormalities that may result in arrhythmias following repurfusion
- myocardial cell death