Heart Rate and Conductivity Disorders Features in Men Under 60 Years Old With Myocardial Infarction and Recurrent Ischemia

Abstract

Relevance. Heart arrhythmia in early postinfarction angina and recurrent myocardial infarction is negatively affected the prognosis of the disease. Aim. To evaluate the peculiarities of heart rhythm and conduction disturbances and electrocardiographic (ECG) changes in men under 60 years old with early postinfarction angina and recurrent myocardial infarction for improve prevention and outcomes. Material and methods. The study included men aged 19-60 years old with myocardial infarction type I. Patients were divided into two age-comparable groups: I - study group with recurrent episodes of ischemia (early postinfarction angina pectoris and / or recurrent MI) - 110 patients; II - control, without them - 555 patients. A comparative assessment of heart arrhythmias and electrocardiographic changes observation frequency in the selected groups was performed. Results. In the patients of the study group more often than among all other patients, ventricular fibrillation was observed (8.5 and 3.9%, respectively; p = 0.04), paroxysmal supraventricular tachycardia (5.7 and 1.8%; p = 0.02) and electrocardiographic signs of the right atrium enlargement (9.4 and 1.6%; p ˂ 0.0001). In group I, among the deceased, electrocardiographic signs of left ventricular hypertrophy were more often detected (93.3 and 57.9%; p = 0.02). Arrhythmias that started in the subacute period of myocardial infarction were recorded with the same frequency in both groups of patients (1.4 and 1.6%; p = 0.9). Conclusions. Men under 60 years old with recurrent episodes of ischemia in myocardial infarction are characterized by potentially curable ventricular fibrillation and supraventricular tachycardias. Electrocardiographic signs of left ventricular enlargement were an additional marker of a poor prognosis for these patients. The frequency of occurrence of "late" arrhythmias in this pathology is 1.4%, and the methods of their possible correction require clarification depending on the mechanism of their development.