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A new, simple and accurate method for determining ejection fraction by Doppler echocardiography
J G Dumesnil1, D Dion, K Yvorchuk
1Quebec Heart Institute.
The Canadian Journal of Cardiology
|December 1, 1995
Summary
A new Doppler echocardiography method accurately measures ejection fraction, even with left ventricular geometry distortions from myocardial infarction. This simple technique offers a feasible and reproducible alternative for routine cardiac assessments.
Area of Science:
- Cardiology
- Medical Imaging
- Diagnostic Techniques
Background:
- Left ventricular (LV) geometry distortions from myocardial infarction can affect ejection fraction (EF) measurements.
- Accurate EF assessment is crucial for diagnosing and managing heart conditions.
Purpose of the Study:
- To evaluate a novel, simple Doppler echocardiography method for EF determination.
- To assess the feasibility, accuracy, and reproducibility of this new method, particularly in patients with regional asynergy.
Main Methods:
- A new Doppler-derived method calculating EF by dividing stroke volume in the LV outflow tract by LV end-diastolic volume (Teichholz's formula).
- Evaluated in 114 patients across two centers, comparing results with radionuclide angiography (RNA).
- Assessed feasibility, accuracy (correlation with RNA), and interobserver variability, including in patients with regional asynergy.
Main Results:
- High feasibility rates (97% Quebec, 100% Ottawa).
- Excellent correlation with RNA (r=0.92 in Quebec, r=0.84 in Ottawa).
- Demonstrated high accuracy and reproducibility, outperforming traditional methods, especially in patients with regional asynergy (r=0.90 Quebec, r=0.75 Ottawa).
Conclusions:
- The new Doppler echocardiography method is feasible, accurate, and reproducible for EF assessment.
- It is particularly valuable in patients with regional asynergy due to myocardial infarction.
- Offers a time-saving alternative for routine EF evaluation, provided no significant mitral regurgitation exists.