Coronary artery calcium outperforms carotid artery intima-media thickness as a noninvasive index of prevalent coronary artery stenosis.
OBJECTIVE
Increased carotid artery intima-media thickness (IMT) and increased coronary artery calcium (CAC) are noninvasive surrogate indices of prevalent coronary artery disease (CAD). We compared CAC to IMT for noninvasive detection of prevalent CAD in participants whose coronary status was identified by coronary angiography.


RESULTS
Male and female CAD patients (> or =50% stenosis in one or more coronary artery, n=79) and controls (no lumen irregularities, n=93) were identified using coronary angiography. Mean maximum carotid IMT was quantified using B-mode ultrasound and total CAC was measured using ECG-gated helical computed tomography (HCT). Carotid IMT was approximately 20% higher in CAD cases compared with controls (P<0.001), whereas mean CAC was 1000% higher in CAD cases than controls (P<0.0001). In multivariable models adjusted for age and sex, IMT greater than the median (1.13 mm) was associated with 2-fold increase in likelihood of prevalent CAD compared with scores below that cut point (P=0.015). CAC scores that exceeded the median score of 92 were associated with 28-fold increase in likelihood of prevalent CAD (P<0.0001). Although associations of increased IMT with prevalent CAD were similar in males and females, CAC scores above the median in females were associated with 39-fold increase in odds of prevalent CAD, whereas males with elevated CAC had 19-fold risk of CAD.


CONCLUSIONS
HCT-measured CAC compares favorably with carotid IMT measured by B-mode ultrasound as a noninvasive index of prevalent CAD.
Terry
James G
JG
Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, USA.
Carr
J Jeffrey
JJ
Tang
Rong
R
Evans
Gregory W
GW
Kouba
Ethel O
EO
Shi
Rong
R
Cook
Delilah R
DR
Vieira
Jose L C
JL
Espeland
Mark A
MA
Mercuri
Michele F
MF
Crouse
John R
JR
D017677:Age Distribution; D000368:Aged; D002118:Calcium / Q000378:metabolism*; D002340:Carotid Artery Diseases / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000473:pathology; D015331:Cohort Studies; D023921:Coronary Stenosis / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000473:pathology; D003331:Coronary Vessels / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000473:pathology*; D003920:Diabetes Mellitus / Q000453:epidemiology; D005260:Female; D006801:Humans; D006973:Hypertension / Q000453:epidemiology; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D015995:Prevalence; D012307:Risk Factors; D017678:Sex Distribution; D012907:Smoking / Q000453:epidemiology; D017539:Tunica Intima / Q000473:pathology; D017540:Tunica Media / Q000473:pathology; D014463:Ultrasonography
D002118:Calcium