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Sequential multivessel coronary angioplasty assessed by thallium-201 tomography
E G DePuey1, G S Roubin, E E DePasquale
1Department of Radiology, Emory University School of Medicine, Atlanta, GA 30322.
Insights
Sequential percutaneous transluminal coronary angioplasty significantly improved myocardial perfusion in patients with multivessel coronary artery disease. Thallium-201 SPECT imaging demonstrated progressive enhancement in blood flow after each angioplasty procedure.
Area of Science:
- Cardiology
- Nuclear Medicine
- Interventional Cardiology
Background:
- Multivessel coronary artery disease (CAD) poses significant risks.
- Percutaneous transluminal coronary angioplasty (PTCA) is a common treatment for CAD.
- Assessing the impact of PTCA on myocardial perfusion is crucial.
Purpose of the Study:
- To evaluate the effectiveness of staged PTCA in improving myocardial perfusion.
- To quantify changes in myocardial perfusion using Thallium-201 SPECT.
- To assess the correlation between successful revascularization and perfusion improvement.
Main Methods:
- 11 patients with multivessel CAD underwent two sequential PTCA procedures.
- Thallium-201 SPECT imaging was performed before and after each PTCA.
- Quantitative analysis of SPECT data yielded an ischemic score.
- Staged PTCA strategy focused on dilating the most severe lesion first.
Main Results:
- Successful PTCA significantly reduced diameter stenosis in treated vessels.
- Mean Thallium-201 ischemic scores decreased significantly after each PTCA (P < .001).
- Nine out of ten patients with abnormal baseline SPECT showed improvement after the first PTCA, with seven showing further improvement after the second.
Conclusions:
- Staged PTCA effectively improves myocardial perfusion in patients with multivessel CAD.
- Thallium-201 SPECT is a valuable tool for documenting perfusion improvements post-PTCA.
- A strategy of addressing the most severe lesions first in staged PTCA leads to progressive perfusion enhancement.
Abstract:
In 11 patients with multivessel coronary artery disease, SPECT thallium-201 imaging was performed prior to and within 3 days after each of two sequential percutaneous transluminal coronary angioplasties on separate days designed to achieve total revascularization. Thallium-201 SPECT was analyzed quantitatively, and an ischemic score for the vascular bed(s) supplied by the dilated vessel(s) was derived. For the vessels dilated during the first procedure the mean diameter stenosis was 80 +/- 8%, reduced to 27 +/- 9%. For the second procedure mean stenosis was reduced from 67 +/- 10% to 26 +/- 6%. For the two procedures, the mean thallium scores decreased from 298 +/- 225 to 115 +/- 130 (P less than .001) and from 135 +/- 129 to 46 +/- 60 (P less than .001), respectively. Of 10 patients with abnormal thallium-201 SPECT prior to angioplasty, nine improved after the first procedure, and seven improved further following the second procedure. Thus, utilizing staged angioplasty with a strategy of dilating the most severe lesion first, thallium-201 SPECT documented progressive improvement in myocardial perfusion.