Stress cardiac magnetic resonance imaging provides effective cardiac risk reclassification in patients with known or...

Area of Science:

• Cardiology
• Medical Imaging
• Risk Stratification

Background:

• Optimized medical therapy is standard for stable coronary artery disease.
• Invasive strategies do not consistently improve cardiac outcomes.
• Novel risk stratification methods are needed to refine therapeutic decisions.

Purpose of the Study:

• To evaluate the prognostic value of inducible ischemia using stress cardiac magnetic resonance imaging (CMR).
• To determine if stress CMR improves risk reclassification for major adverse cardiac events (MACE).
• To assess the utility of stress CMR in patients with stable coronary artery disease.

Main Methods:

• A cohort of 815 patients with myocardial ischemia underwent evaluation.
• Inducible ischemia on stress CMR was assessed for association with MACE.
• Net reclassification improvement (NRI) was calculated by adding inducible ischemia to clinical risk models.

Main Results:

• Inducible ischemia strongly predicted MACE (HR=14.66, P<0.0001) with low event rates.
• Stress CMR improved MACE discrimination (C-statistic 0.81-0.86, P=0.04).
• It reclassified 91.5% of patients, shifting moderate-risk individuals to appropriate low or high-risk categories.

Conclusions:

• Stress CMR effectively reclassifies patient risk beyond standard clinical variables.
• This is particularly beneficial for patients at moderate to high pretest risk.
• Stress CMR is valuable for patients with previous coronary artery disease.