How well does standard clinician evaluation identify low likelihood of ischaemic or coronary heart disease?

Area of Science:

• Cardiology
• Diagnostic Imaging
• Clinical Practice Guidelines

Background:

• Current guidelines suggest clinical assessment can reliably identify patients with a low likelihood of coronary artery disease (CAD).
• Stable angina pectoris is a common indication for referral for coronary angiography.
• Myocardial perfusion scintigraphy is an established non-invasive imaging technique for assessing myocardial ischemia.

Discussion:

• This study evaluated the accuracy of clinical assessment in identifying low-CAD-likelihood patients referred for coronary angiography.
• The study utilized myocardial perfusion scintigraphy to detect reversible perfusion defects in selected low-likelihood groups.
• Angiographic data on significant coronary artery disease were also collected for comparison.

Key Insights:

• A significant percentage of male (23%-29%) and female (11%-17%) patients, classified as low likelihood for CAD based on clinical rules, exhibited reversible perfusion defects on myocardial perfusion scintigraphy.
• Rates of significant angiographic disease were comparable between sexes within these low-likelihood groups.
• These findings challenge the established clinical practice of using simple rules to reliably exclude significant coronary artery disease in patients with suspected stable angina.

Outlook:

• Further research is needed to refine clinical prediction rules for coronary artery disease.
• The integration of non-invasive imaging may be crucial for accurate risk stratification in specific patient populations.
• Revisiting current diagnostic algorithms for suspected stable angina is warranted based on these findings.