Impaired myocardial flow reserve (MFR <2) on 82Rb PET independently predicted hard cardiac events (HR 3.3; 95% CI 1.1-9.5; p=0.029) in patients assessed for ischemia.
Cohort (n=704)
Does myocardial flow reserve (MFR) quantification using 82Rb PET predict adverse outcomes in patients assessed for myocardial ischemia?
MFR quantified using 82Rb PET provides incremental prognostic value over relative myocardial perfusion imaging for predicting hard cardiac events and MACE.
Hazard Ratio: 3.3 (95% CI 1.1–9.5)
p-value: p=0.029
OBJECTIVES: We evaluated the prognostic value of myocardial flow reserve (MFR) using rubidium-82 ((82)Rb) positron emission tomography (PET) in patients assessed for ischemia. BACKGROUND: The clinical value of MFR quantification using (82)Rb PET beyond relative myocardial perfusion imaging remains uncertain. METHODS: We prospectively enrolled 704 consecutive patients; 677 (96%) completed follow-up (median 387 days interquartile range: 375 to 416 days). Patients were divided into 4 groups: I, normal summed stress score (SSS) (2); II, normal SSS and MFR <2; III, SSS ≥4 and MFR ≥2; IV, SSS ≥4 and MFR <2. RESULTS: For patients with a normal SSS and those with an abnormal SSS, there were significant differences in outcomes for hard events (cardiac death and myocardial infarction) between patients with MFR ≥2 and those with MFR <2 (I: 1.3% vs. II: 2% p = 0.029; III: 1.1% vs. IV: 11.4% p = 0.05) and for major adverse cardiac events (MACE) (p = 0.003 and p < 0.001, respectively). In the adjusted Cox model, MFR was an independent predictor of hard events (hazard ratio: 3.3; 95% confidence interval: 1.1 to 9.5; p = 0.029) and MACE (hazard ratio: 2.4, 95% confidence interval: 1.4 to 4.4, p = 0.003). The incremental prognostic value of the MFR over the SSS was demonstrated by comparing the adjusted SSS model with and without the MFR for hard events (p = 0.0197) and MACE (p = 0.002). CONCLUSIONS: MFR quantified using (82)Rb PET predicts hard cardiac events and MACE independent of the SSS and other parameters. Routine assessment of (82)Rb PET-quantified MFR could improve risk stratification for patients being investigated for ischemia.
Ziadi et al. (Mon,) conducted a cohort in Myocardial ischemia (n=704). Impaired myocardial flow reserve (MFR < 2) vs. Normal myocardial flow reserve (MFR ≥ 2) was evaluated on Hard events (cardiac death and myocardial infarction) (HR 3.3, 95% CI 1.1-9.5, p=0.029). Impaired myocardial flow reserve (MFR <2) on 82Rb PET independently predicted hard cardiac events (HR 3.3; 95% CI 1.1-9.5; p=0.029) in patients assessed for ischemia.