Home
Radiology Guides Anatomy Physio & Path Medicine Physics Contact
CARDIAC STRESS TESTS-IMAGE TESTING

Cardiology

CARDIAC STRESS TESTS-IMAGE TESTING

1. The stress imaging studies are the stress echo and myocardial perfusion imaging (MPI) used for measurement of ejection fraction or myocardial viability.

2. Indications: in patients unable to exercise adequately or when there are ECG changes at rest that can interfere with interpretation of the ETT or post-revascularization.

3. Patient can be stressed with exercise (patients must achieve 85% of predicted HR) or dobutamine (inotropic & chronotropic) or vasodilators.

4. Vasodilators work by dilating and increasing blood flow in normal cardiac vessels while doing little to change the flow in stenotic vessels.

5. The dilated normal vessels steal flow from the stenotic vessels, causing perfusion defects in scans (and ST segment changes in ECGs).

6. Vasodilators are not used in patients with history of bronchospasm.


Avatar
REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

+ Home