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Published on: April 13, 2015
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Temporal changes in PET myocardial flow reserve: Implications for cardiovascular outcomes
Ilias Nikolakopoulos1, Ibolya Csecs2, Yi-Hwa Liu2
1Department of Internal Medicine, Yale School of Medicine, New Haven, CT, USA.
Summary
Serial myocardial flow reserve (MFR) measurements and perfusion imaging improve cardiovascular risk prediction. Assessing MFR trends offers better stratification than traditional factors alone.
Area of Science:
- Cardiology
- Nuclear Medicine
- Medical Imaging
Background:
- Serial measurements of myocardial flow reserve (MFR) are understudied for coronary artery disease (CAD) risk prediction.
- Positron emission tomography (PET) myocardial perfusion imaging (MPI) is used to evaluate CAD.
- This study examines MFR and perfusion trends over time and their link to cardiovascular outcomes.
Purpose of the Study:
- To describe trends in myocardial blood flow and perfusion using serial PET MPI.
- To evaluate the association of these trends with major adverse cardiovascular events (MACE).
- To determine if serial MFR and perfusion improve risk stratification for CAD.
Main Methods:
- Retrospective analysis of 474 patients undergoing serial PET MPI for CAD evaluation (2016-2022).
- Patients categorized by MFR trajectory (e.g., low-to-low, high-to-high).
- MACE (death or myocardial infarction) analyzed using Kaplan-Meier and Cox regression; model performance assessed with log-likelihood and C-statistic.
Main Results:
- MFR remained stable across serial exams, but rest and stress flows decreased.
- MFR increased in patients who underwent revascularization.
- Higher MACE rates observed in low-to-low and low-to-high MFR trajectory groups.
- A model incorporating serial MFR and perfusion demonstrated superior risk stratification compared to traditional clinical factors (C-statistic improved from 0.74 to 0.80).
Conclusions:
- Serial assessment of MFR and perfusion provides valuable prognostic information.
- This approach enhances cardiovascular risk stratification beyond conventional clinical risk factors.
- Serial PET MPI offers improved insights into CAD progression and patient outcomes.
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