Exercise electrocardiogram and single vessel coronary artery disease

Area of Science:

• Cardiology
• Diagnostic Imaging
• Exercise Physiology

Background:

• Coronary artery disease (CAD) affects millions globally.
• Accurate detection of myocardial ischaemia is crucial for patient management.
• Exercise electrocardiography (ECG) is a common, non-invasive diagnostic tool.

Purpose of the Study:

• To evaluate the diagnostic efficiency of exercise ECG in identifying ischaemia.
• To assess prediction accuracy for territories of the three main coronary arteries.
• To determine if ST depression location correlates with coronary stenosis site.

Main Methods:

• Prospective analysis of 578 patients with angiographically confirmed single-vessel CAD.
• Patients stratified into three groups based on affected coronary artery: left anterior descending (LAD), right coronary artery (RCA), or left circumflex (LCx).
• Exercise ECG performance analyzed against anatomical location of stenosis.

Main Results:

• Exercise ECG demonstrated poor predictive value for LCx coronary artery ischaemia.
• The location of ST depression on ECG did not reliably predict the site of myocardial ischaemia.
• No specific ECG lead effectively differentiated between the three coronary artery territories.

Conclusions:

• Exercise ECG is unreliable for detecting ischaemia in the LCx territory in single-vessel CAD.
• ECG findings, including ST depression location, lack precision in localizing coronary artery stenosis.
• Further research may be needed to improve non-invasive detection of ischaemia in specific coronary territories.