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[Left ventricular function in patients with dilated cardiomyopathy]
Insights
Dilated cardiomyopathy significantly impairs left ventricle function, affecting both systolic and diastolic performance. Effective treatment requires addressing these dual dysfunctions for improved patient outcomes.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Dilated cardiomyopathy (DCM) is a complex heart condition characterized by left ventricular enlargement and impaired pumping function.
- Understanding the specific functional deficits in DCM is crucial for developing targeted therapeutic strategies.
Purpose of the Study:
- To comprehensively assess the systolic and diastolic functional state of the left ventricle in patients with dilated cardiomyopathy.
- To identify the extent of regional contractility abnormalities and diastolic dysfunction in this patient cohort.
Main Methods:
- Echocardiographic evaluation of left ventricular global systolic function, including ejection fraction, stroke volume, and cardiac index.
- Analysis of regional left ventricular contractility across multiple myocardial segments.
- Assessment of diastolic function parameters, such as isovolumetric relaxation time and ventricular compliance.
Main Results:
- Patients exhibited significantly reduced ejection fraction, stroke volume, and cardiac index.
- Increased end-diastolic and end-systolic volumes, with decreased ejection rate indices.
- Widespread regional contractility impairment (96.3% of segments) and significant diastolic dysfunction, including impaired relaxation and reduced compliance.
Conclusions:
- Dilated cardiomyopathy results in profound global and regional systolic dysfunction of the left ventricle.
- Diastolic dysfunction, encompassing relaxation abnormalities and altered filling dynamics, is a key feature of DCM.
- Therapeutic approaches for dilated cardiomyopathy must integrate management strategies for both systolic and diastolic left ventricular dysfunction.
Abstract:
Functional state of left ventricle was studied in 43 patients with dilated cardiomyopathy. All the patients showed pronouncedly reduced total ejection, stroke volume and cardiac index, increased final diastolic and final systolic volumes, decreased ejection rate indices. Analysis of regional contractility of left ventricle allowed to detect significant fall of ejection fraction in 96.3% of segments. Diastolic dysfunction was characterized by disorders of isovolumetric relaxation, changes in hemodynamical structure and contribution of atrial systole to ventricular filling, decrease of volumetric compliance of left ventricle. The data obtained give a reason to consider that appropriate therapy of dilated cardiomyopathy should be carried out with taking into account both systolic and diastolic left ventricle dysfunction.