The condition you have probably relates to abnormal thickening of the heart muscle. This thickening interferes with the heart's functions by reducing blood flow into and out of the heart chambers.
The risk during a nuclear stress test is extremely small for a heart attack, etc. or any adverse effect. To ensure your full safety, this test will be performed in laboratories that are fully equipped and very carefully and professionally monitor of the patients during the test and this will assure the detection and treat any abnormal conditions that may develop during the course of testing.
Your current health status and medication is a consieration and in order to minimize the risk of any adverse event during the test, and likely there will be an interview and physical exam by a doctor or nurse prior to the test.
Thanks for your question, and if you have any further questions or comments you are welcome to respond to
http://www.medhelp.org/forums/Heart-Disease/show/72. We are a group of members who have experience and knowledge of the medical issues of interest.
Ken