[Diagnostic criteria and classification of unstable stenocardia and lesions in the coronary bed].

A total of 128 patients with unstable angina pectoris (UAP) have been examined. Personal data of clinical examinations and the literature data enabled the authors to elaborate diagnostic criteria of UAP. Classification of UAP with consideration of its history, the clinical course of the disease and changes in the coronary arteries found with coronarography is offered. Almost half of patients with UAP begin to feel it while in perfect health. In 1/3 of cases only therapeutic treatment made the symptoms regress. It is established that UAP occurs mainly due to the changes in the system of left coronary artery. Very often stenosis of the main branch of this artery is observed.