Related Experiment Videos
[Evaluation of left ventricular wall characteristics in ischemic heart disease by cardiac CT examination]
Insights
ECG-gated computed tomography (CT) effectively assesses left ventricular (LV) wall motion and thickness changes in ischemic heart disease patients, correlating well with left ventriculography (LVG) findings for diagnosing myocardial infarction.
Area of Science:
- Cardiology
- Medical Imaging
- Diagnostic Techniques
Background:
- Ischemic heart disease (IHD) significantly impacts left ventricular (LV) function.
- Accurate assessment of LV wall properties is crucial for diagnosing and managing IHD.
- Traditional methods may have limitations in fully characterizing LV wall dynamics.
Purpose of the Study:
- To evaluate the utility of ECG-gated computed tomography (CT) in assessing LV wall properties in patients with IHD.
- To compare CT-derived LV wall motion, thickness changes, and thinning with left ventriculography (LVG) findings.
Main Methods:
- Sixty-one IHD patients underwent ECG-gated CT scans.
- LV slices were analyzed for inner wall motion, wall thickness change during the cardiac cycle, and wall thinning.
- CT findings were compared with angiocardiographic and LVG results.
Main Results:
- CT accurately detected LV inner wall motion abnormalities, correlating with LVG in 82% of segments.
- LV wall thickness changes evaluated by CT correlated with abnormal wall motion in 72% of segments.
- Combined CT assessment of motion and thickness agreed with LVG in 84% of segments; wall thinning correlated with infarction in 87%.
Conclusions:
- ECG-gated CT is a valuable tool for evaluating LV wall motion and thickness changes in IHD.
- CT findings of abnormal motion and thinning correlate strongly with LVG and clinical myocardial infarction.
- CT offers a comprehensive assessment of LV contractility and identifies segments with severe ischemia or infarction.
Abstract:
Sixty-one cases with ischemic heart disease were examined with ECG-gated computed tomography (CT), and left ventricular (LV) wall properties were evaluated by the end-diastolic and end-systolic images of LV slices in terms of LV inner wall motion, LV wall thickness change in cardiac cycle and LV wall thinning. 1) Inner wall motion abnormalities of LV were detected by superimposing ED and ES images, and these coincided with angiocardiographic findings in 82% of LV segments, while assessment was difficult in the septal side because of its poor wall motion even in normal cases. In CT examination, both "hypokinesis" and "dyskinesis" in left ventriculography (LVG) were likely to be expressed as "akinesis" due to poor time resolution, causing difficulty in assessing the severity of abnormality. 2) In CT examination, changes in LV wall thickness during cardiac cycle were easily evaluated, especially in the septal segments. LV segments of a poor thickness change were well correlated with those of the abnormal wall motion assessed by LVG in 72% of LV segments. 3) In CT, LV wall contractility was finally evaluated by the combination of inner wall motion and wall thickness change, and the final assessments agreed with those observed in LVG in 84% of LV segments. 4) LV segments of abnormal motion evaluated by both inner wall motion and wall thickness change in CT image were well correlated with those observed by LVG (75%), and were thought to imply severe myocardial ischemia. 5) A great part of LV segments with wall thinning corresponded to the severely impaired wall motion observed in LVG (83%) and clinically identified myocardial infarction (87%). Wall thinning was well correlated with infarction.