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The most common cardiovascular disease with numerous complications in Ukraine and around the world, despite some significant progress in the study of pathogenesis, clinics, diagnostics and treatment remains the coronary heart disease, which is unfortunately 2-3 times higherin Ukraine than in Europe. The most lethal option for coronary heart disease is myocardial infarction, however, in the first hours of the disease it is not always possible to diagnose and to predict a scenario of subsequent events, so the concept of acute coronary syndrome was formulated as a group of symptoms and signs that allow suspecting acute myocardial infarction or ustable angina 1 . There is an acute coronary syndrome with persistent ST segment elevation on the ECG and without it. The first, in most cases, is transformed into acute MI with a Q wave on the ECG, the second in a sharp MI without a Q wave or unstable angina. ACS without ST segment elevation is observed more often than with ST segment elevation andthe annual incidence is approximately 3 cases per 1000 inhabitants 2 . The risk of death in patients with MI with ST-segment elevation is higher than in patients without ST elevation, however, after 6 months, the probability of death from cardiovascular causes is aligned in both categories of patients and is 12,0 and 13,0% respectively 3 . During recording a normal ECG, the rhythm disturbance in patients is not always possible to record and during the Holter monitoring of the ECG it is possible to estimate the daily number of events to reveal their relationship

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CHARACTERISTICS OF INDICATORS OF HOLTER ECG MONITORING, INDICATORS OF HEART RATE VARIABILITY AND THEIR RELATIONSHIP WITH THE DURATION OF QT INTERVAL IN PATIENTS WITH ACUTE CORONARY SYNDROME