Anticoagulant
An anticoagulant is a drug that helps prevent the clotting (coagulation) of blood. These drugs tend to prevent new clots from forming or an existing clot from enlarging. They don't dissolve a blood clot. Click here to learn more.

Cholesterol
Cholesterol is a soft, waxy substance found among the lipids (fats) in the bloodstream and in all your body's cells. It's an important part of a healthy body because it's used to form cell membranes, some hormones and is needed for other functions. But a high level of cholesterol in the blood -- hypercholesterolemia -- is a major risk factor for coronary heart disease, which leads to heart attack. Click here to learn more.

Defibrillation
Defibrillation is a process in which an electronic device gives an electric shock to the heart. This helps reestablish normal contraction rhythms in a heart having dangerous arrhythmia or in cardiac arrest. Click here to learn more.

Diastolic
The second of two measurements of your blood pressure. Diastolic pressure is the pressure between heartbeats (the pressure when the last sound is heard). Click here to learn more.

Digitalis
Digitalis, also known as digoxin and digitoxin, is a drug that strengthens the contraction of the heart muscle, slows the heart rate and helps eliminate fluid from body tissues. It's often used to treat congestive heart failure and is also used to treat certain arrhythmias. Click here to learn more.

Nitroglycerin
Nitroglycerin is the drug most often used to treat angina pectoris. It mainly relaxes the veins and relaxes the coronary arteries a little. By relaxing the veins, it reduces the amount of blood that returns to the heart and eases the heart's workload. By relaxing the coronary arteries, it increases the heart's blood supply. Click here to learn more.

Systolic
The first of two measurements of your blood pressure. Systolic pressure is the pressure of the blood flow when the heart beats (the pressure when the first sound is heard). Click here to learn more.