This non-invasive, pain-free test measures the amount of calcified plaque in the coronary arteries. Calcified plaque represents coronary artery disease. A high amount of plaque indicates an increased chance of heart attack.
With this information, you and your doctor will have a better idea if Calcium Scoring would help you better manage your health.
Atherosclerosis is the sole cause of calcium deposition in the coronary arteries. CT is able to accurately detect and quantify these calcium deposits. Therefore, a CT generated "coronary artery calcium score" provides a quantitative measurement of a patient's coronary artery atherosclerosis. The calcium score has been shown to be a predictor for future coronary events. It should be noted that calcium scoring is not a coronary angiogram and does not characterize individual atherosclerotic plaques, nor does it quantify the degree of a focal stenosis.
University Radiology uses the latest 64 slice helical CT technology to measure the coronary calcium score. The speed of these high-tech scanners allows cardiac motion to be frozen producing precise measurement of coronary artery calcium.
The calcium score is a number that quantifies the overall size and density of calcification in all of the coronary arteries and main branches. The magnitude of the calcium score is used to assign a qualitative interpretation1. See chart below.
In addition to the overall calcium score, the score is broken down into its anatomic distribution among the left main, left anterior descending and branches, circumflex artery, right coronary artery and posterior descending artery.
1Rumberger JA, Brundage BH, Rader DJ, Kondos G. Mayo Clin Proc 1999; 74:243-252
Coronary calcium scoring has been shown to correlate with future coronary events and helps stratify a patient’s risk. Specifically, a negative test confers a low risk of future events, while a significantly elevated score (>400) has been shown to correlate with obstructive atherosclerosis. Of course, risk stratification is based on statistics and occasionally a patient with a negative test can have obstructive coronary disease.
That atherosclerosis is present. Atherosclerosis is the sole cause of calcium deposits in the coronary arteries. This direct demonstration of atherosclerosis may provide the motivation some patients need to make lifestyle modifications to lower risk.
No. While studies have shown that coronary calcium scoring may help to risk stratify symptomatic (i.e. chest pain) patients, coronary calcium scoring does not replace the conventional work-up because a false negative exam would lead to missing obstructive disease.
Asymptomatic patients in whom the physician wishes to more fully assess their future risk of coronary events. The results of this test should be interpreted in conjunction with an assessment of other cardiac risk factors such as age, gender, hypertension, smoking, family history, etc.