8 Questions
What is the primary cause of Stable Angina?
Narrowing of coronary artery by stable, slowly growing atherosclerotic plaque
Which type of ischemia occurs in Unstable Angina?
Supply ischemia
What is the result of myocardial oxygen deprivation in the mechanism of action of heart disease?
Lactate accumulation leading to damaged cell membrane
What is the characteristic ECG finding during a Stress Test in Stable Angina?
ST depression
What is the primary difference between Non-ST elevation MI and ST elevation MI?
Degree of thrombosis
What is the characteristic ECG finding in Non-ST elevation MI?
ST depression
What is the outcome of necrotic cells in the mechanism of action of heart disease?
They are replaced with collagen fibers
What is the characteristic of chest pain in Unstable Angina?
Unrelieved with rest
Study Notes
Types of Angina and Myocardial Infarction
Stable Angina
- Caused by narrowing of coronary artery by stable, slowly growing atherosclerotic plaque, leading to demand ischemia
- Presentation: chest pain, pressure, tightness with activity, relieved with rest
- Diagnostic tests: ST depression during stress test, normal ECG during rest, negative troponins
- Mechanism: reversible ischemia in subendocardial area
Unstable Angina
- Caused by acute onset of rupture of atherosclerotic plaque with thrombosis, leading to supply ischemia and subendocardial ischemia
- Presentation: acute onset of chest pain, pressure, tightness at rest or unrelieved by rest
- Diagnostic tests: ST depression during rest, negative troponins
- Mechanism: reversible ischemia in subendocardial area
Non-ST Elevation Myocardial Infarction (NSTEMI)
- Caused by acute onset of rupture of atherosclerotic plaque with nearly 100% thrombosis
- Presentation: acute onset of chest pain, pressure, tightness at rest or unrelieved by rest
- Diagnostic tests: ST depression, positive troponins
- Mechanism: infarction that is irreversible
ST Elevation Myocardial Infarction (STEMI)
- Caused by acute onset of rupture of atherosclerotic plaque with nearly 100% thrombosis
- Presentation: acute onset of chest pain, pressure, tightness at rest or unrelieved by rest
- Diagnostic tests: ST elevation, positive troponins
- Mechanism: infarction that is irreversible
This quiz covers the causes and differences between stable angina, unstable angina, non-ST elevation myocardial infarction (MI), and ST elevation MI. It explains the role of coronary artery narrowing, atherosclerotic plaque, and thrombosis in each condition.
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