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Prognostic Value of Cadmium-Zinc-Telluride Dedicated Cardiac SPECT Dynamic Myocardial Perfusion Quantitative Imaging
Linlin Li1,2,3, Zekun Pang4, Jianming Li4
1Department of Molecular Imaging and Nuclear Medicine, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Huanhuxi Road, Hexi District, Tianjin 300060, China.
Insights
Cadmium-zinc-telluride (CZT) SPECT dynamic myocardial perfusion imaging (MPI) effectively assesses prognosis in coronary chronic total occlusion (CTO) patients. Lower stress myocardial blood flow (sMBF) and coronary flow reserve (CFR) indicate higher risk for major adverse cardiovascular events (MACEs).
Area of Science:
- Cardiology
- Nuclear Medicine
- Medical Imaging
Background:
- Coronary chronic total occlusion (CTO) affects up to 30% of patients undergoing coronary angiography.
- Revascularization is often avoided in CTO patients due to complexity and risks.
- Accurate risk stratification is crucial for managing CTO patients.
Purpose of the Study:
- To evaluate the prognostic value of cadmium-zinc-telluride (CZT) SPECT dynamic myocardial perfusion imaging (MPI) in patients with coronary CTO.
- To assess the ability of CZT SPECT dynamic MPI to stratify risk and predict outcomes in this patient group.
Main Methods:
- Retrospective analysis of 62 patients diagnosed with CTO.
- Utilized CZT SPECT dynamic MPI for myocardial perfusion assessment.
- Primary endpoint: major adverse cardiovascular events (MACEs) over a median 17-month follow-up.
Main Results:
- Lower stress myocardial blood flow (sMBF) and coronary flow reserve (CFR) were observed in patients who experienced MACEs (p < 0.05).
- Optimal cut-off values for MACE prediction: sMBF < 0.75 (AUC = 0.74) and CFR < 1.39 (AUC = 0.75).
- Impaired sMBF and CFR significantly correlated with worse clinical outcomes (p < 0.001 and p < 0.01, respectively).
Conclusions:
- CZT SPECT dynamic MPI-derived sMBF and CFR offer significant prognostic value in coronary CTO patients.
- These imaging parameters aid in identifying high-risk CTO patients who may benefit from active intervention.
Background:
The prevalence of chronic total occlusion (CTO) lesions is as high as 30% in patients undergoing coronary angiography (CAG). Some CTO patients do not undergo revascularization due to procedural complexity and high risks. This study aimed to investigate the value of cadmium-zinc-telluride (CZT) SPECT dynamic myocardial perfusion imaging (MPI) for risk stratification and prognosis assessment in patients with coronary CTO.
Methods:
This study retrospectively included 62 patients who underwent CZT SPECT dynamic MPI examination and were diagnosed with CTO by angiography. The primary endpoint was major adverse cardiovascular events (MACEs), defined as cardiovascular death, non-fatal myocardial infarction, non-fatal stroke, hospitalization for heart failure, late coronary revascularization, or hospitalization for unstable angina.
Results:
Over a median follow-up of 17 months (IQR 11-23), 15 MACEs occurred. The stress myocardial blood flow (sMBF) and coronary flow reserve (CFR) in the CTO territory were significantly lower in the MACEs group compared to the non-MACEs group (all p < 0.05). Receiver operating characteristic analysis determined the optimal cut-off values for predicting MACEs as sMBF < 0.75 (sensitivity 78.7%, specificity 73.3%, AUC = 0.74, p < 0.05) and CFR < 1.39 (sensitivity 70.2%, specificity 80.0%, AUC = 0.75, p < 0.01). Kaplan-Meier survival analysis showed that patients with impaired sMBF (p < 0.001) or impaired CFR (p < 0.01), defined by these cut-off values, had significantly worse clinical outcomes.
Conclusions:
The results of this study indicate that sMBF and CFR obtained from CZT SPECT dynamic MPI provide valuable prognostic prediction for patients with coronary CTO lesions, offering critical evidence for identifying high-risk patients requiring active intervention.
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