Exercise tests in patients with severe angina pectoris: an angiographic correlation

Area of Science:

• Cardiology
• Exercise Physiology

Background:

• Severe angina pectoris affects numerous patients.
• Accurate noninvasive diagnostic tools are crucial for risk stratification.

Purpose of the Study:

• To correlate graded submaximal ergometric test results with coronary angiograms in patients with severe angina pectoris.
• To evaluate the sensitivity and specificity of exercise testing in detecting coronary artery disease (CAD).

Main Methods:

• Sixty patients with severe angina pectoris underwent graded submaximal ergometric tests.
• Exercise test results were compared with coronary angiogram findings.
• Analysis included test positivity, negativity, undetermined outcomes, and correlation with lesion severity.

Main Results:

• Exercise testing showed high sensitivity (93%) for detecting significant coronary artery disease.
• Specificity was 75%, with some false positives and negatives observed.
• Heart rate at which ST changes occurred was a better indicator of severity than ST depression degree.
• Undetermined tests often indicated underlying CAD, possibly masked by myocardial fibrosis.

Conclusions:

• Graded exercise testing is a valuable noninvasive method for identifying high-risk patients with severe angina.
• While not perfectly distinguishing all CAD patients, it aids in risk stratification.
• The chronotropic response during exercise provides important diagnostic clues, especially in complex cases.