Choosing the Right Cardiac Test
Choose the test that directly answers the clinical question and is most likely to be diagnostic in that patient.
First Decision¶
| Clinical question | Preferred approach |
|---|---|
| Is coronary plaque or stenosis present? | Coronary CTA |
| Does coronary disease cause ischemia? | Stress imaging |
| What happens during exertion? | Exercise testing |
| Is there scar, inflammation, or infiltration? | CMR |
| What is the valve or ventricular physiology? | Echocardiography |
| Are invasive pressures or coronary physiology needed? | Cardiac catheterization |
Danger
Do not perform provocative stress testing in a patient with ongoing ischemia, dynamic ischemic ECG changes, hemodynamic instability, malignant arrhythmia, or a convincing acute coronary syndrome.
Suspected Coronary Disease¶
Acute chest pain¶
- High risk: invasive coronary angiography
- Intermediate risk: CCTA or stress imaging
- Low risk: additional urgent testing is usually unnecessary after an appropriate clinical decision pathway
Stable chest pain without known CAD¶
- Low risk: testing may be deferred; CAC or exercise ECG may be considered
- Intermediate–high risk: CCTA or stress imaging
- CCTA: best when the primary question is coronary anatomy or plaque
- Stress imaging: best when the primary question is inducible ischemia
Known CAD or prior revascularization¶
Functional imaging is usually more useful than repeating anatomic imaging, particularly with:
- Prior PCI or CABG
- Extensive coronary calcification
- Known obstructive CAD
- Persistent symptoms despite medical therapy
Choosing a Stress Test¶
| Patient | Preferred test |
|---|---|
| Exercises adequately + interpretable ECG | Exercise ECG |
| Exercises adequately + uninterpretable ECG | Exercise stress echo or SPECT |
| Unable to exercise | Pharmacologic stress imaging |
| LBBB or ventricular pacing | Vasodilator PET/SPECT |
| Active wheezing | Exercise if possible; otherwise consider dobutamine |
| Poor echocardiographic windows | PET, SPECT, CMR, or CCTA |
| Obesity or attenuation concern | PET when available |
| Suspected microvascular dysfunction | PET with myocardial blood flow |
| Need valve assessment during stress | Stress echocardiography |
| Need scar or tissue characterization | Stress CMR |
Modality Comparison¶
| Test | Major strength | Major limitation |
|---|---|---|
| Exercise ECG | Functional capacity and symptoms | Requires exercise and interpretable ECG |
| Stress echo | Ischemia, valves, and ventricular function | Image-quality dependent |
| SPECT MPI | Broad availability | Radiation and attenuation artifacts |
| PET MPI | Flow quantification and image quality | Limited availability |
| Stress CMR | Ischemia plus tissue characterization | Availability and patient tolerance |
| CCTA | Coronary anatomy and plaque | Contrast, calcification, and motion |
| Angiography | Anatomy with possible intervention | Invasive |
Common Errors¶
- Testing a truly low-risk patient
- Stressing a patient with active ACS
- Ordering exercise ECG with an uninterpretable baseline ECG
- Using CCTA in severe calcification or complex prior revascularization
- Ordering viability imaging when the result will not change management
- Repeating a recent adequate test without a meaningful clinical change