Myocardial Infarction (MI) and Angina Pectoris
Myocardial Infarction (MI) and Angina Pectoris ( 41 Questions)
This choice is incorrect because vasospasm of the coronary arteries, known as variant (Prinzmetal) angina, is a type of angina pectoris but not the primary cause of MI. Vasospasms may contribute to the development of unstable angina but are not the primary mechanism leading to MI.
This choice is correct. The formation of atherosclerotic plaques within the coronary arteries is the primary cause of MI. Atherosclerosis is a gradual process of plaque buildup, narrowing the coronary arteries, and reducing blood flow to the heart muscle. If a plaque ruptures, it can lead to the formation of a blood clot that completely obstructs the artery, causing MI.
This choice is incorrect because inflammation of the heart muscle, known as myocarditis, is a separate condition and not the primary cause of MI.
This choice is incorrect because increased heart rate and contractility can be associated with certain conditions but are not the primary cause of MI. MI is primarily caused by atherosclerotic plaque formation and subsequent thrombus formation in the coronary arteries.
A) This choice is incorrect because vasospasm of the coronary arteries, known as variant (Prinzmetal) angina, is a type of angina pectoris but not the primary cause of MI. Vasospasms may contribute to the development of unstable angina but are not the primary mechanism leading to MI.
B) This choice is correct. The formation of atherosclerotic plaques within the coronary arteries is the primary cause of MI. Atherosclerosis is a gradual process of plaque buildup, narrowing the coronary arteries, and reducing blood flow to the heart muscle. If a plaque ruptures, it can lead to the formation of a blood clot that completely obstructs the artery, causing MI.
C) This choice is incorrect because inflammation of the heart muscle, known as myocarditis, is a separate condition and not the primary cause of MI.
D) This choice is incorrect because increased heart rate and contractility can be associated with certain conditions but are not the primary cause of MI. MI is primarily caused by atherosclerotic plaque formation and subsequent thrombus formation in the coronary arteries.