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Heart Disease Community
This patient support community is for discussions relating to angina, angioplasty, arrhythmia, bypass surgery, cardiomyopathy, coronary artery disease, defibrillator, heart attack, heart disease, high blood pressure, mitral valve, pacemaker, PAD, stenosis, and stress tests.
"The presence of mechanical heart valves, pacemaker leads and ay other foreign body around the heart can interfere with the quality of the image."
http://www.scandirectory.com/content/body_scan_technology.asp
Also, I know personally that they can't get an image on the atria if you are in afib. I showed up for the test in afib and they couldn't do the CTA until I had been cardioverted about a week later. So if you have a pacemaker because of an AV ablation and afib, they will only be able to look at the coronary arteries feeding the ventricals. But in general the presense of a pacemaker will help sinc the scan to the ventricle's motion. In my case, without a pacemaker, the afib caused the ventricles to beat randomly and so they couldn't sinc and form an image.