Ashwin Kumar

Angina

Angina is classified in one of two types:

1) Stable angina or 2) Unstable angina.
STABLE ANGINA:
Stable angina is the most common type of angina, and what most people mean when they refer to angina. People with stable angina have angina symptoms on a regular basis and the symptoms are somewhat predictable (for example, walking up a flight of steps causes chest pain). For most patients, symptoms occur during exertion and commonly last less than five minutes. They are relieved by rest or medication,
such as nitroglycerin under the tongue.
UNSTABLE ANGINA:

Unstable angina is less common and more serious. The symptoms are more severe and less predictable than the pattern of stable angina. Moreover, the pains are more frequent, last longer, occur at rest, and are not relieved by nitroglycerin under the tongue (or the patient needs to use more nitroglycerin than usual). Unstable angina is not the same as a heart attack, but it warrants an immediate visit to your healthcare provider or hospital emergency department as further cardiac testing is urgently needed. Unstable angina is often a precursor to a heart attack.
CAUSES:
The most common cause of angina is coronary artery disease. A less common cause of angina is spasm of the coronary arteries.
DIAGNOSIS:

The electrocardiogram (EKG) is a recording of the electrical activity of the heart muscle, and can detect heart muscle which is in need of oxygen. The EKG is useful in showing changes caused by inadequate oxygenation of the heart muscle or a heart attack.
The accuracy of exercise stress tests in the diagnosis of significant coronary artery disease is 60% to 70%. If the exercise stress test does not show signs of coronary artery disease, a nuclear agent (thallium) can be given intravenously during exercise stress test. The addition of thallium allows nuclear imaging of blood flow to different regions of the heart, using an external camera. A reduced blood flow in an area of the heart during exercise, with normal blood flow to the area at rest, signifies significant artery narrowing
in that region of the heart.
CT coronary angiography is procedure that uses an intravenous dye that contains iodine, and CT scanning to image the coronary arteries. While the use of catheters is not necessary.