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Rest-redistribution thallium-201 and rest technetium-99m-sestamibi SPECT in patients with stable coronary artery
C Marcassa1, M Galli, A Cuocolo
1S. Maugeri Foundation IRCCS, Veruno, Italy.
Insights
Resting sestamibi uptake closely parallels thallium-201 (201Tl) redistribution in normal and fixed-defect segments. However, sestamibi uptake is significantly lower in reversible 201Tl defect segments.
Area of Science:
- Cardiology
- Nuclear Medicine
- Diagnostic Imaging
Background:
- Ischemic heart disease diagnosis relies on accurate myocardial perfusion imaging.
- Thallium-201 (201Tl) rest-redistribution imaging is a standard, but sestamibi offers potential advantages.
Purpose of the Study:
- To compare resting sestamibi uptake with 201Tl rest-redistribution uptake in patients with ischemic heart disease.
- To evaluate tracer uptake in normal, fixed, and reversible defect segments.
Main Methods:
- 48 patients with ischemic heart disease underwent both 201Tl rest-redistribution and resting sestamibi SPECT on separate days.
- Segmental tracer uptake was quantitatively analyzed.
- Wall motion was assessed by echocardiography in 17 patients.
Main Results:
- Quantitative analysis showed comparable tracer uptake in normal segments and segments with fixed 201Tl defects.
- Sestamibi uptake was significantly lower than 201Tl redistribution uptake in segments with reversible 201Tl defects.
- This finding held true regardless of regional asynergy in reversible defect segments.
Conclusions:
- Resting sestamibi uptake accurately reflects 201Tl redistribution in normal and fixed-defect segments.
- Sestamibi underestimates perfusion in segments with reversible 201Tl defects.
- Quantified sestamibi activity may not fully capture the extent of reversible ischemia compared to 201Tl redistribution.
Unlabelled:
Resting sestamibi uptake was compared with 201Tl rest-redistribution uptake in 48 patients with ischemic heart disease and regional ventricular asynergies.
Methods:
In 48 patients, rest/4-hr redistribution 201Tl and resting sestamibi tomography were closely performed on separate days. Segmental tracer uptake was quantified. Wall motion in corresponding segments was also assessed by two-dimensional echocardiography in 17 patients.
Results:
Quantitative analysis indicates that the uptake of the two tracers was comparable in normal segments as well as in segments with fixed 201Tl defects. In contrast, in segments with reversible 201Tl defects, sestamibi uptake was significantly lower than redistribution 201Tl uptake.
Conclusion:
In patients with chronic ischemic heart disease and regional asynergies, quantified sestamibi activity parallels 201Tl redistribution activity in normal segments and in those with fixed 201Tl defects. In segments showing reversible 201Tl defects, whether or not dysfunctioning, sestamibi uptake is significantly lower than 201Tl redistribution.