In case anyone else has had this suggested to them, here's my experience this week. Basically, it's a radionuclid scan of the heart to see if there are any problems with coronary vessel narrowing etc.
First, you get ECG monitored under stress. Apparently this used to be done with a treadmill, but now they use a iv injection of a coronary vasodilator called Rapiscan (regadenoson) to simulate heavy exertion. The consultant squirts it in and makes some reassuring noises in the hope that nothing bad happens - I was told that I might only notice a feeling like wanting to take a few deep breaths. In practice, I got quickened breathing, chest tightening, a racing heart and a thumping headache - not nice at all!
After this, you have to eat something fatty, lie down for a bit, then get put in a scanner for about 20 minutes.
The whole procedure is repeated on another day but without the stress part.
One interesting thing for me was finding that although the Rapiscan is said to wear off within minutes, I felt totally wiped out for about 24 hours. It will be an anxious wait before the results arrive in a couple of weeks. x