leprechauns definition In the folklore of Ireland, little men who resemble elves. Supposedly, leprechauns can reveal â but only to someone clever enough to catch them â the location of buried treasure, typically a crock of gold hidden at the end of the rainbow.
Exertional angina, or stable angina, is a type of chest pain caused by the blockage of blood flow through a coronary artery, or blood vessel around the heart.
Angina is caused by an imbalance between the amount of oxygen supplied to the heart and the amount needed. There are four types of angina: stable angina, unstable angina, variant (Prinzmetal's) angina, and microvascular angina.In all types of angina the pain is caused by the heart muscle becoming short of oxygen.arrowing of the arteries also occurs in unstable angina and often in variant angina. Microvascular angina is caused by spasms within the walls of small arterial blood vessels causing reduced blood flow to the heart muscle.