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Sestamibi single photon emission computed tomography immediately after primary percutaneous coronary intervention
Anne Kaltoft1, Morten Bøttcher, Niels Peter Sand
1Department of Cardiology, Aarhus University Hospital, Skejby, Denmark.
Insights
Myocardial perfusion imaging (MPI) after primary percutaneous coronary intervention (PCI) effectively identifies patients at risk for large infarcts, even with successful TIMI 3 flow, enabling targeted interventions.
Area of Science:
- Cardiology
- Interventional Cardiology
- Nuclear Cardiology
Background:
- Primary percutaneous coronary intervention (PCI) for ST-elevation myocardial infarction (STEMI) often achieves TIMI 3 flow.
- Despite successful PCI, some STEMI patients experience inadequate tissue perfusion and large infarcts.
- Early identification of at-risk patients is crucial for timely interventions to improve perfusion.
Purpose of the Study:
- To evaluate the efficacy of corrected TIMI frame count (CTFC), myocardial blush grade (MBG), ST-segment resolution, and myocardial perfusion imaging (MPI) in identifying STEMI patients at risk for large infarcts post-primary PCI.
- To determine if these acute assessment techniques predict final infarct size.
Main Methods:
- Sixty-one STEMI patients with TIMI 3 flow post-primary PCI underwent assessment of CTFC, MBG, ST-segment resolution, and quantitative MPI (technetium Tc 99m sestamibi SPECT) immediately after PCI.
- Infarct size was subsequently assessed using peak lactate dehydrogenase (LDH) and MPI at 3 months.
Main Results:
- MPI accurately predicted infarct size (rho = 0.88, P < .001), as did peak LDH (rho = 0.77, P < .001).
- An acute perfusion defect on MPI was the sole significant predictor of infarct size in multivariate analysis.
- CTFC and MBG showed no significant correlation with infarct size, while ST-segment resolution correlated weakly.
Conclusions:
- Myocardial perfusion imaging (MPI) performed immediately after successful primary PCI is a valuable tool for identifying STEMI patients at risk for large infarcts.
- Acute MPI can detect inadequate tissue-level perfusion despite achieved epicardial TIMI 3 flow.
- This early identification facilitates targeted interventions to enhance myocardial perfusion in high-risk patients.
Background:
Primary percutaneous coronary intervention (PCI) for ST-elevation myocardial infarction results in TIMI 3 flow in most patients. However, despite TIMI 3 flow, some patients do not achieve adequate tissue perfusion and have large infarctions. Techniques that, in the acute setting, could identify these patients at increased risk would potentially enable specific interventions to enhance perfusion. The object of the present study was to test whether corrected TIMI frame count (CTFC), myocardial blush grade (MBG), ST-segment resolution, and myocardial perfusion imaging (MPI) can identify those patients who, despite successful treatment with primary PCI for ST-elevation myocardial infarction, are at risk for large infarcts.
Methods:
In 61 patients with TIMI 3 flow after primary PCI, CTFC, MBG, ST-segment resolution, and quantitative MPI by technetium Tc 99m sestamibi single photon emission computed tomography were estimated immediately after primary PCI. Infarct size was assessed by peak lactate dehydrogenase (LDH) and by MPI after 3 months.
Results:
Infarct size by MPI was 12% (4, 23), and peak LDH was 1410 U/L (870, 2220); these measures correlated (rho = 0.80, P < .001). The acute perfusion defect predicted infarct size using either method (MPI rho = 0.88, P < .001; LDH rho = 0.77, P < .001); ST-segment residual correlated weakly to infarct size, whereas CTFC and MBG did not. In multivariate analysis, the acute perfusion defect was the only significant predictor of infarct size.
Conclusion:
Myocardial perfusion imaging performed immediately after successful PCI can identify patients at increased risk for large infarcts due to impaired tissue perfusion. Acute MPI might serve as a tool for early identification of patients, who, despite epicardial TIMI 3 flow, have inadequate tissue level perfusion.
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