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Radionuclide angiocardiography, a noninvasive method for evaluating left ventricular ejection fraction and regional
Insights
Gated synchronous acquisition (GSA) noninvasively assesses left ventricular function. This nuclear medicine technique accurately measures ejection fraction and regional wall motion, showing high correlation with traditional angiography.
Area of Science:
- Nuclear Medicine
- Cardiovascular Imaging
- Diagnostic Cardiology
Background:
- Assessing left ventricular function is crucial for diagnosing and managing cardiac diseases.
- Contrast left ventricular angiography is an invasive standard for evaluating ejection fraction and wall motion.
- Noninvasive methods are sought to provide accurate and reproducible cardiac assessments.
Purpose of the Study:
- To evaluate the efficacy of gated synchronous acquisition (GSA) for assessing left ventricular function.
- To compare GSA-derived ejection fraction and regional wall motion with contrast left ventricular angiography.
Main Methods:
- Gated synchronous acquisition (GSA) utilized cardiac blood pool labeling and electrocardiogram R-wave gating.
- Radionuclide data were recorded on-line to create cardiac blood pool images throughout the cardiac cycle.
- Left ventricular ejection fraction was calculated from time-activity curves, corrected for background activity.
Main Results:
- GSA-derived ejection fractions correlated well with contrast left ventricular angiography (r = 0.87).
- Results demonstrated high reproducibility (r = 0.97) for ejection fraction measurements.
- Left ventricular wall motion analysis showed similar results between GSA and contrast angiography in 26 of 31 patients.
Conclusions:
- Gated synchronous acquisition (GSA) is a simple and safe noninvasive method for evaluating left ventricular ejection fraction.
- GSA provides accurate assessment of regional left ventricular wall motion.
- This nuclear imaging technique offers a reliable alternative to invasive angiography for cardiac function assessment.
Abstract:
The efficacy of gated synchronous acquisition (GSA) after cardiac blood pool labelling in assessing left ventricular function (ejection fraction and regional wall motion) was evaluated in 31 patients within 24 hours of contrast left ventricular angiography. With the R-wave of the electrocardiogram as a physiologic marker, radionuclide data recorded into an on-line computer allowed construction of cardiac blood pool images during sequential periods of the cardiac cycle. The images, of high count density, have good spatial resolution and can be viewed repetitively in real time in a cine mode. The ejection fractions calculated from the left ventricular time-activity curves corrected for background activity correlated well with the ejection fractions determined from dimension analysis of the contrast left ventricular angiograms (r = 0.87). The results were highly reproducible (r = 0.97). Results of analysis of left ventricular wall motion were similar with the two types of angiograms in 26 of the 31 subjects. GSA is a simple, safe means of evaluating left ventricular ejection fraction and regional wall motion noninvasively.