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Quantitative evaluation of left ventricular systolic function by Doppler echocardiographic techniques
1Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic, Rochester, MN 55905, USA.
Insights
Doppler echocardiography noninvasively measures blood flow, providing key hemodynamic data for left ventricular systolic function. This accurate, reproducible method should be routine for cardiac disease assessment.
Area of Science:
- Cardiology
- Medical Imaging
- Hemodynamics
Background:
- Assessing left ventricular systolic contractility traditionally required invasive methods like cardiac catheterization.
- Noninvasive techniques for evaluating cardiac function were limited or cumbersome.
- Doppler echocardiography offers a noninvasive alternative for hemodynamic assessment.
Purpose of the Study:
- To demonstrate the utility of Doppler echocardiography in assessing left ventricular systolic contractility.
- To highlight the ability of Doppler echocardiography to derive quantitative hemodynamic information.
- To advocate for the routine integration of Doppler echocardiography in cardiac patient assessment.
Main Methods:
- Utilizing Doppler echocardiography to measure blood flow velocities noninvasively.
- Applying hydraulic principles to calculate volumetric flow rates, stroke volume, and cardiac output.
- Analyzing mitral regurgitation velocity curves to determine the rate of left ventricular pressure rise.
- Measuring acceleration time from ascending aortic velocity for myocardial force indication.
- Obtaining systolic time intervals from standard Doppler tracings.
Main Results:
- Doppler echocardiography accurately measures blood flow velocities, yielding powerful hemodynamic insights.
- Stroke volume and cardiac output can be determined noninvasively using Doppler-derived flow rates.
- Mitral regurgitation velocity curves provide a non-ejection phase index of systolic contractility.
- Acceleration time serves as an indicator of maximum myocardial force.
- Systolic time intervals are quickly and accurately obtainable via Doppler tracings.
Conclusions:
- Doppler echocardiography provides accurate and reproducible quantitative measurements of left ventricular status.
- These measurements offer valuable hemodynamic information previously only available through invasive procedures.
- Routine noninvasive assessment of cardiac disease patients should incorporate these Doppler-derived parameters.
Abstract:
Doppler echocardiography provides the ability to measure blood flow velocities noinvasively. These blood flow velocities can be used to obtain powerful hemodynamic information about systolic contractility of the left ventricle, which in the past could only be determined from invasive cardiac catheterization or cumbersome pulse recordings. Volumetric flow rates can be measured using the hydraulic principle of flow through a rigid tube, providing a measurement of stroke volume and cardiac output. The rate of the left ventricular pressure rise derived from a mitral regurgitation velocity curve provides a nonejection phase index of systolic contractility. Acceleration time can be obtained from an ascending aortic velocity and is an indicator of maximum myocardial force. Systolic time intervals can now be quickly and accurately obtained from the standard Doppler tracings. These quantitative measurements of the status of the left ventricular are accurate, reproducible, and should be incorporated into the routine noninvasive assessment of patients with cardiac disease.