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L

Term Definition
Laser

A device that produces a concentrated beam of light radiation. Lasers are used in many medical procedures.

Left ventricular assist device (LVAD)

an implantable device that mechanically helps the heart to pump; can be used to buy time while a patient waits for a heart transplant; some women with advanced heart failure may have these devices implanted as a final treatment

left ventricular ejection fraction (LVEF)

see ejection fraction

left-sided heart failure

heart failure that affects the left side of the heart, which receives oxygen-rich blood from the lungs and pumps it to the body; usually happens before right-sided heart failure

Leukocyte

Blood cell involved in fighting infection. They contribute to atherosclerosis by trapping LDL cholesterol in artery walls. Also known as white blood cells, white cells, or white corpuscles.

Lidocaine

A local anesthetic, used to treat pain or numb a part of the body.

ligation and stripping

a surgical procedure to treat vein disease; small incisions are made in your leg and the affected veins are tied off and removed

Linoleic Acid

A polyunsaturated fatty acid found in vegetable oils, especially sunflower oil. Linoleic acid is an essential fatty acid – your body can't make it so you must include it in your diet

Lipase Inhibitor

A drug that limits the body's ability to absorb fat, such as the diet drug Orlistat (Xenical).

Lipid

Fat circulating in the blood.

Lipid profile (lipid panel)

routine blood tests that measure the fatty substances (lipids) in your blood, including total cholesterol, LDL (bad) cholesterol, HDL (good) cholesterol, and triglycerides

Lipoproteins

The combination of a fat (cholesterol or triglyceride) and a protein that allows the fat to dissolve in the blood.

loop diuretic

a type of diuretic medication that works by making the kidneys get rid of more sodium and potassium than normal; of the diuretics, these produce the greatest increase in urine flow

Low density lipoprotein (LDL)

A lipid-protein complex that binds to cholesterol and transports it through the body. LDL cholesterol is referred to as bad cholesterol because it sticks to artery walls, causing fatty plaques to form.

Lp(a)

Lipoprotein little a is a molecule consisting of LDL linked to a protein called apolipoprotein (a). Higher levels of Lp(a) may increase your risk of heart disease.

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