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Br Heart J. 1984 Jan; 51(1): 54–60.
Abstract
Cardiac output determined by Doppler echocardiography was compared with that determined by thermodilution at rest and during dobutamine infusion in 10 patients (group A) and by the Fick method at rest in 11 patients (group B). All patients had angina pectoris without valvular heart disease. Maximum spatial blood velocity and cross sectional aortic area were estimated by the Doppler technique and echocardiography. Cardiac output was calculated by multiplying blood velocity by aortic area at various levels in the ascending aorta. The best correlation of cardiac output between the invasive and non-invasive methods was obtained when maximum velocity in the aortic root and the aortic orifice area were used in the calculations. Cardiac output was considerably overestimated when area measurements in the aortic root were used.
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Selected References
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Articles from British Heart Journal are provided here courtesy of BMJ Publishing Group
FAQs
For cardiac output measurement, the bias was −0.1 L/min with 95% limits of agreement ranging from +2.2 to −2.4 L/min. Conclusions: Doppler echocardiography may frequently be inaccurate in estimating pulmonary artery pressure and cardiac output in patients being evaluated for PH.
Can echocardiograms be inaccurate? ›
In the study, sonography specialists reviewed cardiologists' interpretations of echo tests and found major errors in 29% of all cases.
What is the most accurate method of measuring cardiac output? ›
Cardiac output is calculated by measuring the cross sectional area of the aortic valve together with the velocity profile in the outflow track. However, it may be very difficult to identify the aortic root in some subjects. In these cases the outflow over the pulmonary valve may be used.
What is the Doppler method for measuring cardiac output? ›
Doppler ultrasound noninvasively measures blood velocity as it exits the heart and can be performed during exhaustive exercise without interference of the subject or need for steady state. From the product of aortic blood velocity and cross-sectional area of the aorta, stroke volume (SV) can be calculated.
What is the disadvantage of Doppler echocardiography? ›
Velocity estimation from conventional Doppler requires knowledge of the beam-to-flow angle (inclination angle) to produce reasonable results for regular flows and does a poor job of estimating complex flow patterns, such as those due to stenosis and/or bifurcation.
How accurate is the Doppler measurement? ›
In vivo and in vitro tests of the accuracy obtained using a number of Doppler flow measuring instruments are then reviewed. It is concluded that the Doppler methods are capable of good absolute accuracy when suitably designed equipment is used in appropriate situations, with systematic errors of 6% of less.
Can echocardiograms be misread? ›
Of the 35 physicians who performed clinical readings of the echocardiograms reviewed in the study, only three were Level 3 specialists within cardiology. Sagar's analysis revealed that 68 of the 235 imaging studies, or 29%, were misread.
Can an echocardiogram be wrong about ejection fraction? ›
Introduction Cardiovascular MRI (CMR) is the gold standard for calculation of left ventricular ejection fraction (LVEF). Echocardiography (echo) has been shown to consistently underestimate LVEF when compared to CMR.
Does echocardiogram underestimate ejection fraction? ›
Compared to the angiographic LVEF of ≤35%, echocardiographic LVEF was underestimated in 22 studies and overestimated in 5 studies. The sensitivity and specificity of detecting moderately to severely reduced angiographic LVEF (LVEF ≤35%) by echocardiography was 81% and 88%, respectively.
What is the gold standard method of measuring cardiac output? ›
Objectives: Cardiac output (CO) measurements employing the direct Fick principle represent the gold standard in right-sided heart catheterization (RHC).
Measurement of CO with a pulmonary artery catheter is done using the thermodilution technique: A known volume of D5W at a temperature that is colder than blood temperature is injected into the right atrial port of the catheter. D5W is used because the molecular weight is incorporated into the cardiac output algorithm.
What is the correct way to calculate cardiac output? ›
Cardiac output (CO) is the volume of blood the heart pumps per minute. Cardiac output is calculated by multiplying the stroke volume by the heart rate. Stroke volume is determined by preload, contractility, and afterload.
What is echocardiography Doppler technique? ›
Doppler echocardiography: use of a graphical display system. On methods for preprocessing direction Doppler signals to allow display of directional blood-velocity waveforms by spectrum analysers. The velocity is displayed on the Y axis (ordinate), and time is shown on the X axis (abscissa).
What can the Doppler method tell us? ›
The Doppler technique is a good method for discovering exoplanets. It uses the Doppler effect to analyze the motion and properties of the star and planet. Both the planet and the star are orbiting a common center of mass.
What does the Doppler method detect? ›
Doppler spectroscopy detects periodic shifts in radial velocity by recording variations in the color of light from the host star. When a star moves towards the Earth, its spectrum is blueshifted, while it is redshifted when it moves away from us.
Can Doppler echo detect heart blockage? ›
Doppler echocardiogram.
These changes are called Doppler signals. This part of the test measures the speed and direction of blood flow within the heart and vessels. It can help show blocked or leaking valves and check blood pressure in the heart arteries.
Can you detect heart defect with Doppler? ›
The overall detection rate of major fetal heart defects including routine use of color Doppler was 67%, and 49% were detected at the routine second trimester scan.
Can you hear heart defects on Doppler? ›
Doppler ultrasound cardiotocography (CTG) is suitable for the assessment of the fetal heart rate and some derived parameters, but it is inadequate for detecting heart murmurs.
Can Doppler detect heart problems? ›
Doppler ultrasound testing allows doctors to clearly see how blood flows through the heart and blood vessels. It also lets them see and measure obstructions in arteries and measure the degree of narrowing or leakage of heart valves. It may be recommended for patients with atherosclerosis or coronary artery disease.
