<unk> , and less commonly Prinzmetal angina,<unk> sospastic angina, angina inversa, coronary vessel spasm, or coronary artery<unk> sospasm, is a syndrome typically consisting of angina (cardiac chest pain) in contrast to stable angina which is generally triggered by exertion or intense exercise, commonly occurs in individuals at rest or even asleep and is caused by<unk> sospasm, a narrowing of the coronary arteries due to contraction of the heart's smooth muscle tissue in the vessel walls. In comparison, stable angina is due to the permanent occlusion of these vessels by atherosclerosis (i.e. buildup of fatty plaque and hardening of the arteries).
Variant angina
Microvascular angina
Unstable angina
Coronary steal
Bundle branch block
Atopy
Palisade 
Renal angina