Risk stratification in coronary disease: a contrary viewpoint

Area of Science:

• Cardiology
• Diagnostic Imaging

Background:

• Noninvasive stress testing is standard for identifying patients at risk of cardiac death and myocardial infarction.
• Current methods rely on detecting significant coronary stenosis, but have low positive predictive value in exercising populations.
• Emerging data indicate rapid progression of coronary artery disease (CAD) in minimally obstructed segments contributes to adverse events.

Purpose of the Study:

• To evaluate the effectiveness of noninvasive stress testing in identifying patients who would benefit from invasive cardiac studies.
• To assess the role of noninvasive testing as an intermediate step for selecting patients for coronary angiography and potential bypass surgery.

Main Methods:

• The study reviews current recommendations and data regarding noninvasive stress testing for cardiac risk assessment.
• It analyzes the diagnostic limitations, including positive predictive value and the challenge of detecting rapidly progressing disease.
• The role of catheterization in predicting bypass surgery candidacy is considered.

Main Results:

• Noninvasive stress testing's ability to accurately predict cardiac death and myocardial infarction is limited by low event prevalence in certain patient groups.
• The detection of physiologically significant coronary stenosis is the primary limitation.
• Rapid progression of disease in initially minimally obstructed segments poses a challenge for current noninvasive methods.

Conclusions:

• Noninvasive stress testing is an attractive but unproven hypothesis as an intermediate step for selecting patients for invasive cardiac studies.
• Catheterization remains the only modality proven in randomized trials to predict bypass surgery candidacy.
• Further research is needed to improve the accuracy and utility of noninvasive testing in cardiac risk stratification.