Carotid intima-media thickness: an early marker of cardiovascular disease.
Carotid artery intima-media thickness (IMT) measurements are now recognized as a surrogate measure of atherosclerosis. The measurement is performed on high-resolution ultrasound images of the carotid artery at the level of the carotid bifurcation. Increased IMT values indicate a higher likelihood of having had a stroke or myocardial infarction. In epidemiological studies, IMT measurements made in asymptomatic individuals also predict future cardiovascular events. Intima-media thickness measurements have also been used in clinical trials as a means of gauging the effects of interventions that modify cardiovascular risk factors, low-density lipoprotein cholesterol for example. A positive response to the intervention is defined as a measurable difference in IMT values of the treated group as compared with a control group.The technique has also shown the possibility of identifying certain high-risk individuals with evidence of more advanced atherosclerosis or with a high risk for cardiovascular events. This paper reviews the basic history of the development of carotid artery IMT measurements and discusses some technical aspects of the measurement.
Polak
Joseph F
JF
Ultrasound Reading Center, Tufts Medical Center and Professor of Radiology, Tufts University School of Medicine, Boston, MA 02111, USA. jpolak@tuftsmedicalcenter.org
D000368:Aged; D000369:Aged, 80 and over; D002318:Cardiovascular Diseases / Q000175:diagnosis*; D002340:Carotid Artery Diseases / Q000000981:diagnostic imaging*; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D017539:Tunica Intima / Q000000981:diagnostic imaging*; D017540:Tunica Media / Q000000981:diagnostic imaging*; D014463:Ultrasonography