Reproducibility of digital exercise echocardiography

Area of Science:

• Cardiology
• Diagnostic Imaging
• Medical Technology

Background:

• Coronary heart disease (CHD) diagnosis relies on accurate assessments of myocardial ischemia.
• Exercise echocardiography is a valuable tool for evaluating cardiac function under stress.
• Variability in diagnostic methods impacts clinical decision-making.

Purpose of the Study:

• To assess the intra-observer, inter-observer, and temporal variability of digital upright bicycle exercise echocardiography.
• To determine the diagnostic performance (sensitivity and specificity) of this technique in patients with suspected CHD.
• To compare the reproducibility of exercise echocardiography with other diagnostic modalities like myocardial scintigraphy.

Main Methods:

• Fifty consecutive patients with suspected CHD underwent digital upright bicycle exercise echocardiography.
• Intra-observer, inter-observer, and temporal variability were systematically evaluated.
• Diagnostic accuracy was assessed against significant artery stenoses as the reference standard.
• Agreement was quantified using kappa values and confidence intervals.

Main Results:

• Sensitivity was 89% and specificity was 92% for detecting significant artery stenoses.
• High agreement was observed for intra-observer (86%), inter-observer (92%), and temporal (90%) variability.
• Reproducibility was lower in patients with resting wall motion abnormalities.
• Agreement varied by coronary artery territory, being highest for the circumflex artery (96%).

Conclusions:

• Digital exercise echocardiography demonstrates satisfactory diagnostic accuracy and reproducibility for suspected CHD.
• The technique's performance is comparable to myocardial scintigraphy.
• While generally reliable, a small percentage of results may differ upon repeat testing or re-evaluation, especially in specific patient subgroups.