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Serial evaluation of dilated cardiomyopathy with exercise thallium-201 tomography: correlation with the evolution of
Y Juillière1, P Y Marie, N Danchin
1Department of Cardiology, CHU Nancy-Brabois, Vandoeuvre-les-Nancy, France.
Insights
Exercise thallium-201 tomography cannot predict left ventricular ejection fraction improvement in dilated cardiomyopathy. However, reduced stress myocardial perfusion abnormalities indicate regression of the condition.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Cardiomyopathy Research
Background:
- Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
- Assessing prognosis and treatment response in DCM is crucial.
- Exercise thallium-201 tomography is a non-invasive imaging technique used in cardiac assessment.
Purpose of the Study:
- To correlate initial exercise thallium-201 tomography findings with long-term left ventricular (LV) parameter evolution in DCM patients.
- To evaluate changes in exercise thallium-201 tomography after 1 year in DCM patients.
- To determine if perfusion abnormalities predict LV ejection fraction (LVEF) improvement in DCM.
Main Methods:
- Prospective study of 19 male patients with DCM and normal coronary angiograms.
- Exercise thallium-201 tomography performed at baseline and 1-year follow-up for 14 patients.
- Patients categorized into two groups based on LVEF change: unchanged/decreased (Group 1) and improved (Group 2).
Main Results:
- No statistically significant difference in baseline stress perfusion abnormalities between groups.
- Group 2 showed a significant reduction in abnormal stress segments at follow-up (P < 0.03).
- Neither the presence nor reversibility of perfusion abnormalities predicted LVEF improvement.
Conclusions:
- Exercise thallium-201 tomography cannot predict LVEF improvement in dilated cardiomyopathy.
- Regression of DCM is associated with a decrease in stress myocardial perfusion abnormalities.
- Further research may explore other imaging biomarkers for predicting DCM outcomes.
Abstract:
The purpose of this prospective study was to correlate (1) the initial findings of exercise thallium-201 tomography with the evolution of left ventricular parameters at long term follow-up in patients with dilated cardiomyopathy and (2) the changes of exercise thallium-201 tomography repeated 1 year later. We studied 19 men with dilated cardiomyopathy and normal coronary angiogram. Two patients died and three patients had heart transplantation during follow-up. The other 14 patients were assessed at baseline and 1-year follow-up. Thallium-201 tomograms were divided into 20 segments for each patient. Two groups were defined according to the evolution of left ventricular ejection fraction: group 1 (n = 7) had unchanged or decreased ejection fraction at follow-up (24 +/- 11% at baseline versus 22 +/- 11% at follow-up, ns) and group 2 (n = 7) had improved ejection fraction at follow-up (25 +/- 9% at baseline versus 49 +/- 8% at follow-up, P < 0.03). The number of total abnormal segments at stress were not statistically different at baseline between groups 1 and 2, and in group 1 between baseline and follow-up. Group 2 at follow-up had a reduced number of total abnormal segments (P < 0.03). The percentage of reversibility was similar in both groups at baseline and follow-up. On exercise thallium-201 tomography, neither the presence nor the reversibility of stress myocardial perfusion abnormalities can predict improvement of left ventricular ejection fraction in dilated cardiomyopathy. However, regression of dilated cardiomyopathy is accompanied by a reduction of stress myocardial perfusion abnormalities.