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One-year effect of myocardial revascularization on resting left ventricular function and regional thallium uptake in
A Cuocolo1, E Nicolai, M Petretta
1Nuclear Medicine Center of the National Council of Research (CNR), Department of Biomorphological and Functional Sciences, University Federico II, Naples, Italy.
Insights
Successful revascularization in chronic coronary artery disease (CAD) patients leads to lasting improvements in myocardial perfusion and left ventricular (LV) function. Thallium imaging accurately predicts functional recovery after revascularization.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Cardiovascular Imaging
Background:
- Chronic coronary artery disease (CAD) poses challenges regarding the long-term efficacy of revascularization on myocardial perfusion and left ventricular (LV) function.
- Assessing the persistence of functional improvements post-revascularization is crucial for patient management.
Purpose of the Study:
- To evaluate the 1-year effects of successful revascularization on myocardial perfusion and LV function in patients with CAD.
- To determine the accuracy of thallium imaging in predicting functional recovery one year after revascularization.
Main Methods:
- A prospective study involving 38 revascularized CAD patients (experimental group) and 29 non-revascularized controls.
- Utilized 201Tl tomography, echocardiography, and radionuclide angiography before and after a 1-year follow-up.
- Quantified regional thallium activity and assessed LV systolic function and wall motion.
Main Results:
- In the experimental group, 75% of initially dysfunctional-viable segments showed functional recovery after revascularization, while 81% of nonviable segments did not.
- LV ejection fraction significantly improved and remained stable at 1-year post-revascularization.
- The control group showed no significant changes in myocardial perfusion or LV function over the follow-up period.
Conclusions:
- Successful coronary revascularization provides stable, long-term improvements in myocardial perfusion and LV function in CAD patients.
- Preserved thallium uptake in dysfunctional myocardial regions is a reliable predictor of functional recovery post-revascularization.
Unlabelled:
It is still unclear whether in patients with chronic coronary artery disease (CAD) the improvements in myocardial perfusion and left ventricular (LV) function induced by revascularization persist in the long run. This study was planned to evaluate the 1-yr effects of successful revascularization on myocardial perfusion and LV function in patients with CAD and to assess the accuracy of thallium imaging in the prediction of functional recovery 1 yr after revascularization.
Methods:
Thirty-eight patients with chronic CAD who were revascularized (experimental group) underwent, while off drugs, 201Tl tomography, two-dimensional echocardiography and radionuclide angiography before and after a 1-yr follow-up. Twenty-nine patients with similar characteristics who were not revascularized (control group) and completed the 1-yr follow-up were also studied. Regional thallium activity was quantitatively measured in 13 segments per patient. Systolic function was assessed by echocardiography in corresponding segments.
Results:
In the experimental group, at baseline, on the basis of regional LV function and thallium uptake, 276 segments were normal, 169 dysfunctional-viable and 49 nonviable. After revascularization, the majority (75%) of the dysfunctional-viable segments at baseline showed functional recovery at follow-up, whereas the majority (81%) of the nonviable segments at baseline did not. Simultaneously, LV ejection fraction increased 4 wk after revascularization (from 39% +/- 9% to 42% +/- 10%, p < 0.01) and remained unchanged after 1-yr (43% +/- 8%, p < 0.01 versus baseline study). LV wall-motion score index after 1 yr was reduced (from 1.68 +/- 0.4 to 1.42 +/- 0.3, p < 0.001) as compared with baseline. On the contrary, in the control group, no change in myocardial perfusion and LV function was detected after the 1-yr follow-up.
Conclusion:
In patients with chronic CAD, successful coronary revascularization induces a stable improvement in myocardial perfusion and LV function, which is still detectable after a 1-yr follow-up. Furthermore, preserved thallium uptake in dysfunctional regions is predictive of functional recovery after revascularization.