The ST segment/heart rate slope as a predictor of coronary artery disease: comparison with quantitative thallium
Insights
The ST/heart rate slope is a more accurate ECG criterion for diagnosing coronary artery disease (CAD) than traditional methods. This improved diagnostic accuracy was confirmed through comparisons with thallium imaging and standard treadmill tests.
Area of Science:
- Cardiology
- Medical Diagnostics
- Electrocardiography
Background:
- Coronary artery disease (CAD) diagnosis relies on various methods.
- The ST/heart rate slope (ST/HR slope) is a novel ECG criterion for CAD.
- Evaluating the ST/HR slope's clinical utility is crucial.
Purpose of the Study:
- To compare the diagnostic accuracy of the ST/HR slope with quantitative stress thallium (TI) and standard treadmill criteria for significant CAD.
- To assess the ST/HR slope's effectiveness in patients with varying exercise tolerance.
- To determine the correlation between the ST/HR slope and angiographic CAD severity.
Main Methods:
- A study involving 64 unselected patients undergoing coronary angiography.
- Comparison of ST/HR slope against TI imaging and standard treadmill ECG criteria.
- Analysis of diagnostic accuracy, sensitivity, and correlation with Gensini score.
Main Results:
- The ST/HR slope demonstrated superior overall diagnostic accuracy (81%) compared to TI (67%) and conventional ST criteria (69%).
- In patients not reaching 85% maximal heart rate, ST/HR slope accuracy (77%) was comparable to TI (74%).
- ST/HR slope sensitivity (91%) in patients without prior myocardial infarction was equivalent to TI (95%) and correlated with CAD severity (r=0.61).
Conclusions:
- The ST/HR slope is an improved ECG criterion for diagnosing significant CAD.
- The ST/HR slope offers diagnostic accuracy comparable to TI imaging, especially in specific patient subgroups.
- This ECG method provides a valuable, non-invasive tool for CAD assessment.
Abstract:
The ST segment shift relative to exercise-induced increments in heart rate, the ST/heart rate slope (ST/HR slope), has been proposed as a more accurate ECG criterion for diagnosing significant coronary artery disease (CAD). Its clinical utility, with the use of a standard treadmill protocol, was compared with quantitative stress thallium (TI) and standard treadmill criteria in 64 unselected patients who underwent coronary angiography. The overall diagnostic accuracy of the ST/HR slope was an improvement over TI and conventional ST criteria (81%, 67%, and 69%). For patients failing to reach 85% of their age-predicted maximal heart rate, its diagnostic accuracy was comparable with TI (77% and 74%). Its sensitivity in patients without prior myocardial infarctions was equivalent to that of thallium (91% and 95%). The ST/HR slope was directly related to the angiographic severity (Gensini score) of CAD in patients without a prior infarction (r = 0.61, p less than 0.001). The ST/HR slope was an improved ECG criterion for diagnosing CAD and compared favorably with TI imaging.
More Related Videos
11:09High-Resolution Cardiac Positron Emission Tomography/Computed Tomography for Small Animals
Published on: December 16, 2022
06:57Semi-Automatic Graphical Tool for Measuring Coronary Artery Spatially Weighted Calcium Score from Gated Cardiac Computed Tomography Images
Published on: September 22, 2023
Related Concept Videos
01:28Imaging Studies for Cardiovascular System V: CT
01:25Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT
01:30Acute Coronary Syndrome III: Diagnostic Studies