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Unstable angina is a type of angina pectoris [1] that is irregular or more easily provoked. [2] It is classified as a type of acute coronary syndrome. [3] It can be difficult to distinguish unstable angina from non-ST elevation (non-Q wave) myocardial infarction.
CAD symptoms vary from none, to chest pain only when exercising (stable angina), to chest pain even at rest (unstable angina). It can even manifest as a myocardial infarction; if blood flow to the heart is not restored within a few hours, whether spontaneously or by medical intervention, the blood-deprived part of the heart becomes necrotic ...
Angina may be stable or unstable. Unstable angina is most often associated with emergent, acute coronary syndromes. [20] Angina is typically located below the sternum. [4] Individuals experiencing angina characterize the pain in different ways, but the pain is usually described as crushing, squeezing, or burning. [7]
All right, as a quick recap…. Angina pectoris is chest pain caused by reduced blood flow resulting in a lack of oxygen in the heart muscle. There are three types: stable angina, unstable angina, and vasospastic angina. Rest tends to relieve stable angina, but not the other two types, and all three can be treated with nitroglycerin.
Unstable angina (UA) (also "crescendo angina"; this is a form of acute coronary syndrome) is defined as angina pectoris that changes or worsens or begins suddenly at rest. [12] Unstable angina is a medical emergency and requires urgent medical treatment from a doctor. [5] It has at least one of these three features: [13]
In unstable angina, symptoms may appear on rest or on minimal exertion. [6] The symptoms can last longer than those in stable angina, can be resistant to rest or medicine, and can get worse over time. [8] [10] Though ACS is usually associated with coronary thrombosis, it can also be associated with cocaine use. [11]
CAD can cause stable angina, unstable angina, myocardial ischemia, [16] and myocardial infarction. [17] A common symptom is angina, which is chest pain or discomfort which may travel into the shoulder, arm, back, neck, or jaw. [4] Occasionally it may feel like heartburn.
Shorter episodes of occlusion can lead to what is referred to as silent myocardial ischemia due to its asymptomatic nature. [1] These episodes can also be accompanied by arrhythmias. [1] Longer episodes of occlusion can lead to stable or unstable angina, myocardial infarction, and sudden cardiac death. [1]
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