ECG dispersion mapping parameters during the treadmill test in patients with coronary heart disease

Material and methods: The main group included 143 CHD patients with Functional Class I-III angina (99 men and 44 women; mean age 50,6±4,6 years). The control group included 37 healthy individuals (mean age 44,3±4,8 years). Patients with heart failure signs and symptoms were excluded. All participants underwent the graduated physical stress test.Aim: The aim of the study was the complex analysis of the ECG-12 and ECG dispersion mapping (DM) parameters during the physical stress test in patients with coronary heart disease (CHD).Results: Two variants of the ECG changes were observed, with normal and abnormal reaction of ECG DM parameters. The latter group was characterised by the following: ratio of heart rate and myocardial micro-alternation index (HRmax/MMImax) <3,5; ΔHRmax/ΔMMImax-min <2,0; and MMI >30% at the peak HR.Conclusion: Using the ECG DM method during the treadmill test is a feasible and useful approach to gain additional diagnostic information on the myocardial electro-physiological status and, therefore, to select the patients who need further examination and treatment.