Relations between digital thermal monitoring of vascular function, the Framingham risk score, and coronary artery calcium score

• Published in: Journal of cardiovascular computed tomography Vol. 2; no. 6; pp. 382 - 388
• Main Authors: Ahmadi, Naser, MD, Hajsadeghi, Fereshteh, MD, Gul, Khawar, MD, Vane, Jackson, MS, Usman, Nudrat, MD, Flores, Ferdinand, BS, Nasir, Khurram, MD, MPH, Hecht, Harvey, MD, Naghavi, Morteza, MD, Budoff, Matthew, MD
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.11.2008
• Subjects: Calcinosis - diagnosis; Calcinosis - epidemiology; Cardiovascular; Comorbidity; Coronary artery calcium score; Coronary artery disease; Coronary Artery Disease - diagnosis; Coronary Artery Disease - epidemiology; Diagnosis, Computer-Assisted - methods; Digital thermal monitoring; Framingham risk score; Humans; Incidence; Middle Aged; Reproducibility of Results; Risk Assessment - methods; Risk Factors; Sensitivity and Specificity; Signal Processing, Computer-Assisted; Statistics as Topic; Thermography - methods; United States - epidemiology; United States; Digital thermal monitoring; Coronary artery disease; Framingham risk score; Coronary artery calcium score
• ISSN: 1934-5925; 1876-861X
• DOI: 10.1016/j.jcct.2008.09.001

Background Digital thermal monitoring (DTM) of vascular function was shown to correlate with the presence of known coronary artery disease (CAD). Objective We evaluated whether DTM can identify at-risk, asymptomatic patients with significant coronary artery calcium (CAC) or increased Framingham risk score (FRS). Methods Two hundred thirty-three consecutive asymptomatic subjects (58 ± 11 years; 62% men) without known CAD underwent DTM, CAC, and FRS calculation. DTM measurements were obtained during and after a 5-minute suprasystolic arm-cuff occlusion. After cuff-deflation temperature rebound (TR) and area under the temperature curve (AUC) were measured and correlated with FRS and CAC. Results TR was lower in patients with FRS > 20% and CAC ≥ 100 as compared with FRS < 10% and CAC < 10, respectively ( P < 0.05). After adjustment for age, sex, and traditional cardiac risk factors, the odds ratio of the lowest compared with the upper 2 tertiles of TR was 3.96 for FRS ≥ 20% and 2.37 for CAC ≥ 100 compared with low-risk cohorts. The area under the receiver operating characteristic (ROC) curve to predict CAC ≥ 100 increased significantly from 0.66 for FRS to 0.79 for TR to 0.89 for TR + FRS. Conclusions Vascular dysfunction measured by DTM strongly correlates with FRS and CAC independent of age, sex, and traditional cardiac risk factors and was superior to FRS for the prediction of significant CAC.