Related Experiment Videos
[Heart function in patients with and without wall dyskinesia. Echocardiographic-cineangiographic comparative study]
Insights
Mean velocity of circumferential fiber shortening (VCF) effectively assesses left ventricular contractility. This parameter remains stable despite preload changes, simplifying cardiac function evaluation.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Imaging
Background:
- Left ventricular contractility is crucial for cardiac function assessment.
- Evaluating contractility requires reliable and stable parameters.
- Existing methods may be complex or sensitive to physiological variations.
Purpose of the Study:
- To evaluate the mean velocity of circumferential fiber shortening (VCF) as a parameter for assessing basal left ventricular contractility.
- To determine the stability of VCF under varying preload conditions.
- To simplify the calculation of VCF by assuming a rotational ellipsoid model for the heart.
Main Methods:
- Utilized echocardiography and angiography techniques.
- Calculated mean VCF assuming a rotational ellipsoid model of the heart.
- Investigated five patient groups with normal and abnormal cardiac function.
Main Results:
- Mean VCF is a reliable indicator of basal left ventricular contractility.
- VCF remains relatively constant during acute and chronic preload changes (compensated volume overload).
- An inverse relationship between VCF and afterload is maintained.
Conclusions:
- Mean VCF is a valuable and stable parameter for assessing left ventricular contractility.
- The simplified calculation method (rotational ellipsoid) is effective.
- This parameter aids in differentiating normal and abnormal cardiac function.
Abstract:
The mean velocity of circumferential fibre shortening determined by echo and angiography is a good parameter for the assessment of the basal left ventricular contractility. It remains relatively constant in acute and chronic changes in preload i.e. compensated volume overload, though the inverse relation to afterload is still maintained. For the calculation of mean VCF we assumed the heart to be a rotational ellipsoid. Models and extrapolation of curve are not necessary for the calculation of this parameter. On the basis of these considerations we investigated with the echographic and angiographic technique 5 patient groups having normal cardiac function (group I, IV) and abnormal function (group II, III and V).