Other Types of Angina
I just found these different forms of angina interesting and felt that some of you all might, too. Whether, or not we have it, it's amazing all the things that medical science knows and brings to us to learn. Hugs, Teri 
Variant angina pectoris which I mentioned above is also called Prinzmetal's angina," it's a rare form of angina caused by something called coronary spasm (vasospasm). The spasm temporarily narrows the coronary artery, so the heart does not get enough blood. It may happen in patients who also have a severe buildup of fatty plaque (atherosclerosis) in at least one major vessel. Unlike typical angina, variant angina usually happens during times of rest. These attacks, which may be very painful, tend to happen regularly at certain times of the day.
Microvascular angina is a type of angina where patients have chest pain but do not seem to have a blockage in a coronary artery. The pain in the chest is because the tiny blood vessels that feed the heart, arms, and legs are not working properly. Generally, patients cope well with this type of angina and have very few long-term side effects."
See the following for more info...
http://www.texasheartinstitute.org/angina.html