Glossary of Terms

This glossary of terms has been compiled for your reference. Select the first letter of the word you’re searching for to begin.

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Laser Angioplasty

A technique used to open coronary arteries blocked by plaque. A catheter with a laser at its tip is inserted into an artery. Then it’s advanced through the artery to the blockage. When the laser is in position, it emits pulsating beams of light that vaporize the plaque.

LDL Cholesterol

Often called “bad” cholesterol. A high level of LDL cholesterol (160 mg/dL and above) reflects an increased risk of heart disease and stroke. (See Low- Density Lipoprotein.)


A fatty substance insoluble in blood.


The combination of lipid (fat) surrounded by a protein; the protein makes the fat soluble in blood.

Low-Density Lipoprotein (LDL)

A type of protein that transports “harmful” cholesterol in the blood. It’s the major cholesterol carrier in the blood. (See LDL Cholesterol.)

Lp(a) Cholesterol

A genetic variation of LDL cholesterol. A high level of Lp(a) is an important risk factor for developing atherosclerosis prematurely.