Stress/rest myocardial perfusion scintigraphy in patients without significant coronary artery disease

Area of Science:

• Cardiology
• Nuclear Medicine
• Diagnostic Imaging

Background:

• Coronary artery disease (CAD) diagnosis typically relies on coronary angiography.
• Myocardial perfusion scintigraphy (MPS) is a non-invasive imaging technique used to assess blood flow to the heart muscle.
• The prognostic value of MPS in patients with angiographically excluded significant CAD requires further definition.

Purpose of the Study:

• To determine the prognostic significance of stress myocardial perfusion scintigraphy (MPS) in patients with no significant coronary artery disease (CAD) on angiography.
• To evaluate if quantitative analysis of MPS can identify patients at risk for adverse clinical outcomes.

Main Methods:

• A cohort of 118 patients with diameter stenosis <50% on quantitative angiography and recent stress MPS was identified.
• Patients were followed for a mean of 6.3 years for death, major adverse events (MAE), or significant symptoms.
• Quantitative perfusion SPECT (QPS) was used to analyze stress and rest MPS (99mTc-MIBI or tetrofosmin) for summed stress and rest scores (SSS/SRS).

Main Results:

• Significant differences in summed stress scores (SSS) were observed between patients who experienced death, MAE, or significant symptoms versus those who did not.
• Logistic regression analysis confirmed SSS as a significant predictor of both death (OR=1.074) and MAE (OR=1.087).
• A higher SSS was associated with an increased likelihood of adverse outcomes and clinical symptoms.

Conclusions:

• Stress MPS results are a valuable predictor of long-term prognosis in patients without significant angiographic coronary artery disease.
• Quantitative analysis of MPS, specifically SSS, aids in identifying patients with a higher risk of developing future clinical events or symptoms.
• Stress MPS provides prognostic information beyond traditional coronary angiography in select patient populations.