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[Evaluation of transient dilation of the left ventricle on exercise thallium-201 scintigraphy]
Insights
Transient left ventricular dilation on exercise Tl scintigraphy, quantified by the Transient Dilation Index (TDI), correlates with the number of stenotic coronary vessels. This simple index aids in detecting multi-vessel coronary artery disease.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Diagnostic Imaging
Background:
- Ischemic heart disease can manifest as transient left ventricular dilation post-exercise.
- The correlation between this dilation and coronary artery disease severity requires further investigation.
Purpose of the Study:
- To assess the relationship between transient left ventricular dilation and coronary arteriographic findings.
- To evaluate the utility of the Transient Dilation Index (TDI) in identifying multi-vessel coronary stenosis.
Main Methods:
- Quantitative analysis of short-axis tomographic images from exercise Tl scintigraphy in 32 ischemic heart disease patients and 15 controls.
- Calculation of the Transient Dilation Index (TDI) by comparing immediate post-exercise and delayed 3-hour redistribution images.
- Correlation of TDI with coronary arteriographic findings, specifically the number of stenotic vessels.
Main Results:
- Patients with two-vessel and three-vessel coronary artery disease exhibited significantly higher TDI compared to controls.
- No significant difference in TDI was observed between patients with single-vessel disease and controls.
- Transient left ventricular dilation appears linked to the extent of coronary artery stenosis.
Conclusions:
- The Transient Dilation Index (TDI) is a valuable, simple quantitative measure for detecting multi-vessel coronary artery stenosis.
- Exercise Tl scintigraphy with TDI assessment can aid in non-invasively evaluating coronary artery disease severity.
Abstract:
We have noted that some patients with ischemic heart disease have a pattern of transient dilation of the left ventricle on the immediate post exercise images as compared with 3 hour redistribution images. We assessed correlation between transient dilation of the left ventricle and coronary arteriographic findings in 32 patients with ischemic heart disease and 15 controls. Initial and delayed conventional short axis tomographic images were obtained after reconstruction of 20 projections acquired over 180 degrees. Thirty six radii by every 10 degrees were generated from the center of the middle myocardial images of the short axis. An area surrounded by thirty six points of maximal count on each radius was calculated in initial and delayed images. Transient Dilation Index (TDI) as an index of dilation was determined by dividing an area in initial image by an area in delayed image. There was no difference in TDI between patients with 1 vessel disease and controls, but TDI in patients with two vessel disease and patients with three vessel disease was larger than that in controls. Thus, transient dilation of the left ventricle on exercise Tl scintigraphy was likely to be related to number of stenotic vessel. We concluded that TDI as a simple quantitative index of transient dilation of the left ventricle was useful for detecting multi vessel stenosis.