Electrocardiographic response during dobutamine stress echocardiography

Area of Science:

• Cardiology
• Diagnostic Imaging
• Clinical Medicine

Background:

• Dobutamine stress echocardiography (DS echo) is a common diagnostic tool.
• 12-lead electrocardiograms (ECG) are often included in DS echo protocols.
• The incremental diagnostic value of DS ECG in conjunction with DS echo is not well-established.

Purpose of the Study:

• To evaluate the added diagnostic value of the 12-lead electrocardiogram (DS ECG) when used with dobutamine stress echocardiography (DS echo).
• To assess the impact of DS ECG on the detection of significant coronary artery stenosis.

Main Methods:

• Retrospective review of 76 patients undergoing DS echo and coronary angiography.
• Analysis of DS echo findings and DS ECG for detecting coronary artery disease (CAD).
• Comparison of diagnostic performance metrics (sensitivity, specificity, PPV, NPV, accuracy).

Main Results:

• Coronary artery disease prevalence was 86% in the study population.
• Baseline ECG abnormalities limited interpretation in 46% of patients.
• DS echo alone demonstrated high sensitivity (92%) and accuracy (89%) for detecting >50% stenosis.
• DS ECG alone showed poor diagnostic performance (accuracy 39%).
• Combining DS echo and DS ECG slightly improved sensitivity but significantly reduced specificity, PPV, NPV, and accuracy.

Conclusions:

• DS ECG is interpretable in only about 50% of patients undergoing DS echo.
• DS ECG is a poor predictor of coronary artery disease.
• The addition of DS ECG to DS echo provides minimal incremental diagnostic value and may not be cost-effective.