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Usefulness of left ventricular wall thickness-to-diameter ratio in thallium-201 scintigraphy
Insights
The ratio of left ventricular wall thickness to cavity dimension on thallium-201 images effectively predicts left ventricular ejection fraction and volume in coronary artery disease patients. This simple imaging ratio offers a valuable, non-invasive method for assessing cardiac function.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Nuclear Medicine
Background:
- Assessing left ventricular ejection fraction and volume is crucial for managing coronary artery disease (CAD).
- Traditional methods like radionuclide ventriculography can be invasive or resource-intensive.
- A simpler, non-invasive method to estimate these parameters is needed.
Purpose of the Study:
- To evaluate the utility of the left ventricular (LV) wall thickness-to-cavity diameter ratio from thallium-201 images as a predictor of LV ejection fraction and volume.
- To correlate this ratio with ejection fraction and end-systolic volume determined by radionuclide ventriculography.
Main Methods:
- Rest thallium-201 images were acquired in 50 patients with symptomatic coronary artery disease.
- The ratio of LV wall thickness to transverse cavity diameter was measured in the left anterior oblique projection.
- LV ejection fraction and volume were quantified using radionuclide ventriculography.
Main Results:
- A strong positive correlation was observed between the thickness-to-diameter ratio and ejection fraction (r = 0.80).
- A strong negative correlation was found between the ratio and end-systolic volume (r = -0.71).
- Patients with a ratio < 0.70 had significantly lower ejection fractions (22%) and higher volumes compared to those with a ratio >= 1.0 (49%).
Conclusions:
- The LV wall thickness-to-cavity diameter ratio derived from thallium-201 images is a reliable, non-invasive predictor of LV ejection fraction and volume in CAD patients.
- This ratio can aid in the initial assessment and stratification of cardiac function in patients with coronary artery disease.
- Further studies could explore its role in routine clinical practice for CAD management.
Abstract:
The ratio of left ventricular wall thickness to the cavity dimension, as seen on thallium-201 images, was used in this study to predict left ventricular ejection fraction and volume. We obtained rest thallium-201 images in 50 patients with symptomatic coronary artery disease. The thickness of a normal-appearing segment of the left ventricular wall and the transverse diameter of the cavity were measured in the left anterior oblique projection. The left ventricular ejection fraction and volume in these patients were determined by radionuclide ventriculography. There was a good correlation between thickness-to-diameter ratio and ejection fraction (r = 0.80) and end-systolic volume (r = -0.71). In 18 patients with a thickness-to-diameter ratio less than 0.70, the ejection fraction was lower than in the 16 patients with thickness-to-diameter ratio greater than or equal to 1.0 (22 +/- 2% versus 49 +/- 3%, mean +/- SEM, p less than 0.001). Similarly, in patients with a thickness-to-diameter ratio less than 0.70, the end-diastolic and end-systolic volume were higher than in the remaining patients with higher thickness-to-diameter ratios (p less than 0.02, p less than 0.001, respectively). All 18 patients with a thickness-to-diameter ratio less than 0.70 had ejection fractions less than 40%; 14 of 15 patients with a thickness-to-diameter ratio greater than or equal to 1.0 had an ejection fraction greater than 40% (p less than 0.001). The remaining 16 patients with a thickness-to-diameter ratio of 0.7-0.99 had intermediate ejection fractions and volumes.(ABSTRACT TRUNCATED AT 250 WORDS)