Angina pectoris during exercise--relationship to coronary anatomy and myocardial function

Area of Science:

• Cardiology
• Exercise Physiology

Background:

• Coronary heart disease (CHD) diagnosis relies on correlating symptoms with objective measures.
• Exercise testing is crucial for assessing CHD severity and functional impact.
• The predictive value of angina pectoris versus ST segment depression in CHD requires further elucidation.

Purpose of the Study:

• To investigate the association between angina pectoris during exercise testing and the extent of coronary heart disease.
• To determine if angina or ST segment depression better predicts disease severity and left ventricular ejection fraction changes.
• To correlate exercise-induced ST segment depression with coronary artery disease burden.

Main Methods:

• Studied 34 patients with proven coronary heart disease.
• Assessed angina pectoris, fatigue, or breathlessness as limiting symptoms during exercise testing.
• Measured exercise duration, ST segment depression, and fall in left ventricular ejection fraction.
• Utilized coronary score to quantify disease extent.

Main Results:

• ST segment depression was more pronounced in patients with angina (1.4mm) compared to those without (1.1mm).
• A significant correlation was observed between ST segment depression and coronary score (r=0.6) and fall in left ventricular ejection fraction (r=0.5).
• ST segment depression, unlike angina pectoris, effectively predicted the extent of coronary heart disease and its functional consequences.

Conclusions:

• ST segment depression during exercise testing is a more reliable predictor of coronary heart disease extent and functional impact than the presence of angina pectoris.
• Exercise-induced ST segment changes provide valuable prognostic information in patients with established coronary heart disease.
• Clinical interpretation of exercise tests should emphasize ST segment depression for assessing disease severity.