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[Left ventricular diastolic flow dynamics in dilated cardiomyopathy: a color flow imaging and pulsed Doppler
T Mikami1, T Kudo, M Hashimoto
1Department of Cardiovascular Medicine, Hokkaido University School of Medicine, Sapporo.
Insights
Patients with dilated cardiomyopathy (DCM) show delayed left ventricular (LV) filling flow timing. This delay occurs within the LV, not just at the mitral valve, indicating altered diastolic function in DCM.
Area of Science:
- Cardiology
- Medical Imaging
- Physiology
Background:
- Dilated cardiomyopathy (DCM) affects left ventricular (LV) function.
- Understanding diastolic filling patterns is crucial for diagnosing and managing cardiac conditions.
Purpose of the Study:
- To investigate left ventricular (LV) filling flow dynamics in patients with dilated cardiomyopathy (DCM) compared to healthy individuals.
- To differentiate between mitral inflow patterns and intraventricular flow propagation in DCM.
Main Methods:
- Utilized color flow imaging and pulsed Doppler echocardiography with an apical approach.
- Analyzed diastolic filling flow at the mitral orifice and within the LV (3 cm below).
- Compared flow velocity patterns, timing, and spatial characteristics between DCM patients and normal subjects.
Main Results:
- Color flow imaging revealed slower inflow signal propagation toward the apex in DCM.
- Pulsed Doppler showed a significantly greater delay in peak velocity timing within the LV in DCM.
- Mitral inflow velocity, filling flow width, and velocity reduction rates did not differ significantly between groups.
Conclusions:
- In DCM, there is a distinct delay in left ventricular (LV) filling flow timing relative to the mitral orifice.
- This intraventricular delay cannot be solely attributed to altered mitral flow velocity patterns.
- Findings suggest intrinsic abnormalities in LV diastolic function and flow propagation in DCM.
Abstract:
Left ventricular filling flow was evaluated at the mitral orifice and in the left ventricle (LV) using color flow imaging and pulsed Doppler echocardiography in seven patients with dilated cardiomyopathy (DCM) and 10 normal subjects. Using the apical approach, filling flow in early and late diastole was observed by two-dimensional color and M-mode color flow imaging, and flow velocity patterns at the mitral orifice and in the LV, 3 cm below the orifice, were analyzed by pulsed Doppler echocardiography. Color flow imaging disclosed slower movement of the inflow signals toward the apex in DCM than in the normal. With pulsed Doppler echocardiography, the delay in timing of peak velocity in the LV was distinctly greater in DCM than in the normal, although the mitral inflow velocity did not differ between DCM and the normal. The width of the filling flow, the rate of velocity reduction and the flow velocity in the LV did not differ between DCM and the normal. Thus, in DCM, the timing of filling flow in the LV is clearly delayed compared to the timing at the mitral orifice, and this cannot be explained solely by the mitral flow velocity pattern.