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Exercise testing? Not at all
1Cardiac Investigation Unit, St Vincent's Hospital, Melbourne, Vic., Australia.
Insights
Exercise stress tests for coronary artery disease can be misleading. Coronary angiography provides superior prognostic information for guiding revascularization decisions in patients with suspected heart disease.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Clinical Medicine
Background:
- The conventional evaluation of suspected coronary artery disease involves clinical assessment, non-invasive ischemia testing, and potentially coronary angiography with revascularization.
- Exercise stress testing results can be discordant with clinical assessments, often proving misleading for diagnosis.
Purpose of the Study:
- To evaluate the utility and limitations of exercise stress testing in diagnosing and prognosing coronary artery disease.
- To determine the optimal role of exercise testing in the management pathway for patients with suspected or confirmed coronary artery disease.
Main Methods:
- Review of existing literature and clinical guidelines regarding exercise stress testing and coronary angiography.
- Comparative analysis of diagnostic and prognostic information from clinical evaluation, exercise tests, and coronary angiography.
Main Results:
- Exercise stress tests are unreliable diagnostic tools when discordant with clinical findings.
- ST segment depression on exercise tests is an independent prognosticator, but less informative than coronary angiogram findings.
- Coronary angiography provides superior prognostic data for guiding decisions on coronary angioplasty or bypass surgery.
Conclusions:
- Exercise stress testing has a limited role in diagnosing coronary artery disease.
- Optimal use of exercise testing is as a gatekeeper for coronary angiography in cases of diagnostic uncertainty or difficult chest pain assessment.
- Coronary angiography remains the gold standard for prognostication and guiding revascularization strategies.
Abstract:
The traditional approach to the ambulatory patient with suspected or definite coronary disease is to evaluate the clinical features, to perform non-invasive tests for myocardial ischaemia, and to proceed, if necessary, to coronary angiography and coronary revascularisation. However, when the results of the exercise tests are discordant with the clinical classifications they are usually misleading as diagnostic tools. When the exercise test is used to assist prognostication, the information provided overlaps with that available to the clinician and only the presence of ST segment depression is an independent prognosticator. The amount of ST segment shift has been found to be an inferior prognosticator to the severity of disease seen on a coronary angiogram and the latter allows for appropriate decisions to be made regarding coronary angioplasty or bypass surgery. A more appropriate use of exercise testing is as a gate for coronary angiography if there is real doubt or the nature of the chest pain or as an aid in therapeutic decisions if the coronary angiography interpretation is difficult.