Pain of angina pectoris when there is a pronounced occlusion of an artery in the heart. The pain is often frequent and severe. This may be a forewarning of a possible myocardial infarction stable angina.
Angina which has suddenly become worse.
Angina that has changed to a more frequent and more severe form. It can occur during rest and may be an indication of impending myocardial infarction. Unstable angina is a medical emergency.
There is a form of angina pectoris, a condition marked by chest pain resulting from inadequate blood flow to the heart muscle, which manifests during sleep or arises spontaneously without any specific trigger, such as physical exertion.
A variant of angina pectoris (chest discomfort resulting from insufficient blood flow to the heart muscle) that arises during sleep or without any specific triggers (unlike exercise-induced pain in regular angina). The description “unstable” may also encompass angina that is increasing in frequency or intensity. Unstable angina constitutes a medical urgency due to the heightened potential for a myocardial infarction (heart attack). Medications are administered, and angioplasty might be required.