There are a number of characteristics that are representative of patients with chronic unstable angina. Patients with this condition are typically male (though not always), under the age of 70, and have a history of coronary artery disease for a number of years. In addition, patients may have a history of myocardial infarctions and previous revascularization procedures. Risk factors include hypertension, coronary artery disease, smoking, and diabetes. If you suffer from many of these conditions, and you are still experiencing frequent episodes of pain despite extensive angina treatments, then you may have chronic unstable angina.

Reference

DeJongste MJL, Tio RA, Foreman RD. Chronic therapeutically refractory angina pectoris. Heart 2004;90:225-30.