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Arrhythmogenic Right Ventricular Dysplasia
This is an important question and there two ways to approach it. One is to keep testing your heart, the other genetic testing, both of which, I assume, have not yet excluded ARVD. As you probably have learned already, to confirm or exclude a diagnosis in your case may be complicated.
MRI of ARVD
Findings in ARVD include fatty tissue replacement of some of your heart muscle with fatty tissue, especially on the right side of your heart, causing ventricular arrhythmias that are usually exercise-related, and sometimes lethal:
Testing therefore focuses on finding evidence of all these, and besides genetic testing include things like a cardiac MRI and exercise stress testing, the first to see whether there is evidence of abnormal fat in your heart muscle, the second to test you for arrhythmias while exercising:
If your stress test is negative, long term Holter monitoring for a week or longer might be helpful.
Unfortunately, there is no single test, which is why I recommend you to find a center with expertise in this area. In Boston some of the best facilities in the world are available, and I recommend you take advantage of that. Mentioning your family, you didn't tell me whether there have been lethal complications?
Hope this helps,
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