They witnessed the artery in spasm, injected
nitroglycerin, and the artery calmed down. The
heart itself was clean, and no major blockages where found requiring stents or further work.
But I do know the the spasms occur not just at rest but after exercise, thus the conundrum as far as definitions go. Is there something like unstable variant angina and if so is that different from unstable angina? I.e. does unstable angina always refer to the heart rather than the arteries contracting?