Abstract
Unstable angina is part of the acute coronary syndrome (ACS) spectrum; it is related to non-Q-wave myocardial infarction and slightly more distantly related to Q-wave myocardial infarction. The diversity of conditions leading to unstable angina as well as the varying symptoms upon presentation have made the definition and classification of unstable angina difficult (1). The Global Unstable Angina Registry and Treatment Evaluation (GUARANTEE) study reported that one-third of hospitalized patients with cardiac chest pain had new or accelerated symptoms associated with exertion, whereas two-thirds had rest angina (2). This distinction is important, since patients with exertional angina may have a gradual worsening of an underlying atherosclerotic coronary arterial narrowing, as opposed to those with rest angina, who have an abrupt reduction in myocardial perfusion owing to a ruptured plaque (see Chapter 1). Angina at rest is often associated with electrocardiographic changes of ischemia and shares a similar underlying mechanism with threatened vessel closure following percutaneous coronary angioplasty, i.e., plaque disruption. Whether spontaneous or as a result of angioplasty, plaque rupture leads to exposure of the coronary arterial subendothelial components, platelet activation, and thrombus formation.
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Moliterno, D.J. (2003). Unstable Angina Trials. In: Lincoff, A.M. (eds) Platelet Glycoprotein IIb/IIIa Inhibitors in Cardiovascular Disease. Contemporary Cardiology. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-376-7_10
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DOI: https://doi.org/10.1007/978-1-59259-376-7_10
Publisher Name: Humana Press, Totowa, NJ
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