Technologist Track Session 03: Ischemic Heart Disease (2018)-Dobutamine Stress CMR

Video Transcription

Video Summary

The speaker explains how dobutamine stress MRI works and where it is most useful. Dobutamine mimics exercise by increasing heart rate and contractility, allowing clinicians to detect ischemia through wall motion abnormalities and, if desired, perfusion defects. The ischemic cascade is reviewed: perfusion changes appear first, followed by wall motion changes, ECG changes, and then symptoms. Dobutamine stress MRI is compared with echo, nuclear medicine, CT angiography, and conventional angiography. It is harder to perform than adenosine stress, often requiring atropine and careful monitoring, but can be used when vasodilators are contraindicated, such as in asthma, COPD, heart block, Wolff-Parkinson-White, or severe aortic stenosis. The talk emphasizes that dobutamine is especially valuable for viability imaging, helping predict whether dysfunctional myocardium will recover after revascularization by combining delayed enhancement, wall thickness, and low-dose dobutamine contractile response.

Keywords

dobutamine stress MRI

ischemia detection

wall motion abnormalities

myocardial viability

revascularization