Here is a study done just a few years ago (2010) from the European Society of cardiology on Non-Obstructive Coronary Artery Disease
Perhaps it will help my brothers and sisters across the pond, as this being the European Society of Cardiology, the doctors may have been heard of and respected by your cardiologists abroad. Daissy in Switzerland had been asking for some research to show docs. So check out this link to print if need be.
Highlights of it?? ~ "The common denominator of the three clinical cases is angina with normal coronary arteries. This condition is not unusual. Indeed, about 10-20% of patients presenting with acute coronary syndrome and about 20-30% of patients presenting with stable angina and inducible myocardial ischemia, exhibit angiographically normal coronary arteries or non obstructive coronary atherosclerosis."
it goes on to state some testing... but be aware, there are those of us who have still had difficulty showing ischemia. If you spasm, it can be hard to reproduce, hit or miss and usually it is this array of testing that may show something, somewhere. The real question at hand is treatment right away for the symptoms, however, since spotting this and tagging the Beast may prove costly and difficult. My Cardiac MRI, for example was "ok". You need proper technicians to read for microvascular or non-obstructive presentations.
Much Clarity and Light to All