Prognostic value of exercise echocardiography in patients with classic angina pectoris

Area of Science:

• Cardiology
• Diagnostic Imaging
• Prognostic Evaluation

Background:

• The prognostic role of stress echocardiography in angina pectoris patients with high pretest probability of coronary artery disease (CAD) requires further definition.
• Existing risk stratification methods may not fully capture the prognostic implications of echocardiographic findings in this population.

Purpose of the Study:

• To evaluate the prognostic value of stress echocardiography in patients with angina pectoris and a high pretest probability of CAD.
• To identify independent predictors of cardiac events and assess the incremental value of echocardiographic data in risk stratification.

Main Methods:

• A cohort of 437 patients with angina pectoris and high pretest CAD probability underwent exercise echocardiography.
• Patients were followed for hard cardiac events (cardiac death, nonfatal myocardial infarction) and coronary revascularization.
• Multivariate analysis was used to identify independent predictors of cardiac events, including clinical, exercise, and echocardiographic parameters.

Main Results:

• Event-free survival rates were significantly higher in patients with normal stress echocardiograms compared to those with abnormal findings.
• Independent predictors of hard cardiac events included Q waves on ECG and multivessel wall motion abnormalities during exercise.
• Echocardiographic data significantly improved the predictive model for all cardiac events, increasing the chi-square from 62 to 78 (p = 0.0003).

Conclusions:

• Exercise echocardiography provides valuable prognostic information for risk stratification in patients with suspected CAD and high pretest probability.
• Patients with normal exercise echocardiograms demonstrate a low event rate, suggesting they may be candidates for deferral of invasive procedures for up to 3 years.