Correlation between resting ST segment depression, exercise testing, coronary angiography, and long-term prognosis.

Area of Science:

• Cardiology
• Clinical Electrocardiography
• Diagnostic Imaging

Background:

• Resting ST segment depression is a known marker for adverse cardiac events.
• Its correlation with exercise testing and coronary angiography requires further investigation.

Purpose of the Study:

• To correlate resting ST segment depression with exercise test results and coronary angiography findings.
• To assess the impact of resting ST segment depression on long-term prognosis in patients with and without prior myocardial infarction.

Main Methods:

• Retrospective study of 476 patients undergoing exercise testing and coronary angiography.
• Exclusion criteria included women, left bundle branch block, left ventricular hypertrophy, digoxin use, prior revascularization, or significant valvular/congenital heart disease.
• Long-term follow-up averaged 45 months.

Main Results:

• 10% of patients without prior infarction and 15% with prior infarction showed resting ST segment depression.
• Patients with resting ST segment depression and prior infarction had a 2.5 times higher prevalence of severe coronary artery disease (43% vs. 17%) and larger postinfarction left ventricles.
• Exercise-induced ST depression ≥2 mm was a useful marker for diagnosing coronary disease in patients without prior infarction.

Conclusions:

• Resting ST segment depression is associated with a higher prevalence of severe coronary artery disease, particularly in patients with a history of myocardial infarction.
• This finding underscores the prognostic value of resting ST segment depression in cardiac risk stratification.
• Further research may refine the diagnostic utility of exercise-induced ST segment changes in conjunction with resting ECG findings.