Merits and limitations of quantitative treadmill exercise score

Area of Science:

• Cardiology
• Diagnostic Imaging
• Exercise Physiology

Background:

• Coronary artery disease (CAD) diagnosis relies on accurate risk stratification.
• Non-invasive stress testing is crucial for evaluating patients with suspected CAD.
• The treadmill exercise score (TES) is a composite index derived from electrocardiographic (ECG) changes during exercise.

Purpose of the Study:

• To evaluate the diagnostic accuracy of the TES for detecting the presence and extent of CAD.
• To compare the performance of TES with traditional ST segment depression criteria.

Main Methods:

• A cohort of 130 patients (34 no CAD, 38 one-vessel CAD, 58 multivessel CAD) underwent treadmill exercise testing.
• The TES was calculated using ST segment depression, ST slope, R wave amplitude, exercise duration, and heart rate.
• Receiver operating characteristic (ROC) curves were used to assess sensitivity and specificity.

Main Results:

• The TES demonstrated comparable predictive accuracy to ST segment depression for CAD detection (77% vs 78%, p=NS).
• Markedly abnormal TES (< -1.0) correctly identified multivessel CAD in 78% of cases.
• Normal or near-normal TES (> 0) identified no or one-vessel CAD in 82% of cases.
• The extent of CAD was accurately classified in 80% of patients with extreme TES values (very high or very low).

Conclusions:

• The TES is a valuable tool for diagnosing CAD, with accuracy comparable to ST segment depression.
• Extreme TES values provide significant information regarding the extent of coronary artery disease.
• The TES may aid in risk stratification and clinical decision-making for patients with suspected CAD.