Relevance: According to modern concepts to the syndrome include VDS prolapse heart valves, atrial septal aneurysm and sinuses, ectopic fastened chord mitral valve, and many others. Mitral valve prolapse (MVP) is the most frequent variant of valvular heart disease and is found in many young people. According to some authors, its frequency in the population is between 1.8 and 38%. However, its true prevalence, frequency combination valve disease among themselves and with other VDS, the most frequently detected phenomena electrocardiographic and hemodynamic parameters, the issues of forecasting and developing therapies to date are still poorly understood. Another important aspect — the social nature of the problem, since the PLA is often diagnosed in young adults, that is, in the main, and conscription of child-bearing age. Objective: To investigate the prevalence of PMK, clinical features, to identify the most frequent electrocardiographic phenomena and rhythm disorders and examine the status of intracardiac hemodynamics in patients with PMC, depending on the degree of mitral valve prolapse and the presence of regurgitation. Practical significance: This study will help in the diagnosis of the disease, prognosis and assessment of the course and in patients with MVP. The study involved 62 patients 2 RCH cardiology department with mitral valve prolapse. Of these, 56 were men (90.3%), 6 women (9.6%). The average age of the patients was 22.8 years. Besides general clinical methods we used non-invasive methods of investigation of the cardiovascular system, which included electrocardiography (ECG) and echocardiography (M-mode). Hemodynamically significant mitral valve prolapse with regurgitation was detected in 41 men. In evaluating the data of electrocardiography in 56.1% of the surveyed group they had identified a variety of cardiac arrhythmias. PMK is often accompanied by the following electrocardiographic phenomena: blockade of the right and left bundle-branch block (41.1%), syndrome W-P-W (14.7%), sinus tachycardia (11.7%), sinus bradycardia (26.4%), supraventricular and ventricular ectopic beats (14.7%), left ventricular hypertrophy (29.4%), paroxysmal supraventricular tachycardia (2.4%), and complete AV-block (2.4%). Conclusions: PMK is quite frequent pathologies among young people and is not echo phenomenon. The average age of the patients was 22.8 years. Patients diagnosed with MVP regardless of the degree of regurgitation are recommended with ECG monitoring and exercise testing (bicycle ergometry) to identify LDCs. The combination of PMC with myxomatous degeneration of the valves worsens prognosis, intracardiac hemodynamics and is a predictor of arrhythmias. This revealed the greatest changes in intracardiac hemodynamics in patients with PMC registered with LDCs. The most pronounced hemodynamic changes are marked by complications PMK II–III degree of regurgitation with various LDCs. The presence of cardiac arrhythmias in patients with mitral valve prolapse is associated with an increase in end-diastolic volume of the left ventricle and the volume of the left atrium, the mitral regurgitate volume as compared with the healthy subjects. By echocardiography in patients with MVP is marked diastolic dysfunction. The increase in severity over time, IBC and the degree of mitral valve regurgitation can lead to a progressive disruption of intracardiac hemodynamics.