Abstract

Background: Dilated cardiomyopathy is a disease of the heart muscle, characterized by dilatation     of the heart chamber and a dysfunction of the left or both ventricles. It often leads to progressive heart failure, and is the leading cause of heart transplant among all cardiomyopathy. The annual rate of sudden cardiac death in dilated cardiomyopathy is 2 - 4%, with sudden death accounting for half of all deaths    [9]. Echocardiography is an evaluation of a patient with dilated cardiomyopathy. There have been many studies on dilated cardiomyopathy in the world. However, there are still few studies evaluating diastolic function in patients with dilated cardiomyopathy using cardiac Doppler echocardiography. Experts around the world have made many recommendations in assessing left ventricular diastolic function, most recently is the recommendation ASE/EACVI 2016. Comparing with the 2009 EAE/ASE recommendation, the recommendation ASE/EACVI 2016 for assessment of left ventricular diastolic function has fewer parameters, so it is easier to implement and more convenient in clinical practice.

Objective: Surveying left ventricular diastolic function according to the recommendation ASE/EACVI 2016 in patients with dilated cardiomyopathy by echocardiography and investigating the relationship between left ventricular diastolic function with left ventricular dilatation, heart failure NYHA, left ventricular ejection fraction, left ventricle fractional shortening.

Methods: Research was designed as a cross - sectional descriptive study. Studied on 56 patients with primary dilated cardiomyopathy were hospitalized and treated at Hue Central Hospital.

Results: The results showed:

The mean end - diastolic and end - systolic left ventricular diameters were 66,11 ± 7,3 mm and 57,7 ± 8,02 mm. The mean left atrial diameter was 40,61 ± 7,65 mm. The mean left ventricular ejection fraction was 24,68 ± 5,97%. The mean fractional shortening of left ventricular contraction was 12,91 ± 4,55%. All patients in the study group had left ventricular diastolic dysfunction. The highest proportion is diastolic dysfunction grade II (44,6%), followed by diastolic dysfunction grade III (35,8%) and diastolic dysfunction grade I is 19,6%. There was no statistically significant relationship between the classification of left ventricular diastolic dysfunction and left ventricular systolic and diastolic diameter (p > 0.05). There is       a relationship between left ventricular diastolic dysfunction and parameters of ejection fraction EF and contraction fraction FS (p < 0.005). There is a moderate positive correlation between the classification of left ventricular diastolic dysfunction and the heart failure rating according to NYHA (r = 0,445, p < 0,001).

Conclusion: All patients in the study group had left ventricular diastolic dysfunction, mostly grade II and grade III diastolic dysfunction. This disorder is clearly demonstrated by the change in the parameters of the left ventricular diastolic function assessment on echocardiography according to the 2016 ASE/ EACVI recommendations, a new recommendation introduced to approach the assessment of diastolic functionmore convenient and easier way.

Key words: Dilated cardiomyopathy, left ventricular diastolic dysfunction, the recommendation ASE / EACVI 2016.