Unstable Angina:
Progressive increase in the number, severity, or duration of chest pain episodes or a new episode that is brought on by physical activity or that occurs at rest; frightening and disabling condition that can lead to a heart attack; type of chest pain that is more intense, lasts longer, is brought on by less effort, occurs at rest, or is a combination of these factors and is triggered by decreased blood flow to an area of the heart due to a change in a lesion. Unstable angina requires hospitalization and treatment because approximately one-third of patients will suffer a heart attack within three months of an episode.
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