Total ischemic burden in patients with coronary artery disease

Area of Science:

• Cardiology
• Ischemic Heart Disease
• Atherosclerosis

Background:

• Angina pectoris frequently underestimates coronary artery disease (CAD) activity and patient risk.
• Sudden cardiac death and myocardial infarction often occur without prior warning symptoms.
• Objective testing reveals frequent, asymptomatic myocardial ischemia (ST-segment depression) during daily activities.

Purpose of the Study:

• To introduce the concept of "total ischemic burden" as a unified measure for both symptomatic and asymptomatic ischemic episodes in CAD.
• To highlight the association between active ischemia and increased risk of adverse events across various CAD subgroups.
• To emphasize the potential clinical utility of assessing total ischemic burden for risk stratification and guiding therapeutic interventions.

Main Methods:

• Review of existing research on myocardial perfusion and ischemic episodes in coronary artery disease patients.
• Analysis of data from in-hospital and ambulatory monitoring studies demonstrating asymptomatic ischemia.
• Consideration of pathophysiologic similarities between painful and painless myocardial ischemia.

Main Results:

• Total ischemic burden, encompassing both symptomatic and asymptomatic ischemia, is linked to increased risk of morbid events in diverse CAD patient groups.
• Active ischemia, regardless of symptoms, is a significant predictor of adverse outcomes.
• The concept of total ischemic burden may become a standard part of clinical investigation for CAD.

Conclusions:

• Total ischemic burden is a critical marker for assessing dynamic changes in coronary atherosclerosis.
• Prospective trials are needed to confirm the prognostic value of total ischemic burden and evaluate therapies aimed at reducing it.
• Future research should focus on treatments that modify the natural history of obstructive coronary atherosclerosis to improve long-term CAD outcomes.