Article

Gamma glutamyltransferase as a novel marker of coronary artery calcification in women

aDepartment of Pneumoconiosis, Shanghai Pulmonary Hospital, Tongji University School of Medicine bDepartment of Surgery, Shanghai Children's Medical Center, Shanghai Jiaotong University School of Medicine, Shanghai, China cTransplantation Research Center, Samsung Biomedical Research Institute dDepartment of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea eDepartment of Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China fCenter for Health Promotion, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea *These two authors contributed equally to this work.
Journal of Cardiovascular Medicine (Impact Factor: 1.41). 07/2012; 13(11). DOI: 10.2459/JCM.0b013e328356a432
Source: PubMed

ABSTRACT AIMS: Gamma glutamyltransferase (GGT) has attracted great interest as a potential novel marker of cardiovascular risk. However, its association with coronary artery calcification (CAC) score-determined coronary artery atherosclerosis is unknown. This study was designed to assess the association of GGT with CAC score. METHODS: Participants, 311 asymptomatic men and 220 asymptomatic women who underwent evaluation of CAC by cardiac computed tomography, were retrospectively investigated. Correlation and logistic regression analysis were used to assess the association of GGT with CAC score and other variables. RESULTS: Women but not men with higher GGT had a higher incidence of CAC score above 100 and a higher prevalence of metabolic syndrome (P = 0.012 and 0.007, respectively). GGT was positively correlated with C-reactive protein (CRP) in women (r = 0.336, P < 0.001). GGT was independently associated with the incidence of CAC score above 100 in women [odds ratio (OR) 1.228, 95% confidence interval (CI) 1.206-1.252, P = 0.001] but not in men. CONCLUSION: In asymptomatic women, GGT is independently and positively associated with CAC score and it can be useful as a provisional new risk factor for CAC. Additionally, metabolic syndrome and CRP may be the mediators of the mechanisms by which GGT increases CAC in asymptomatic women.

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    ABSTRACT: Background Elevated gamma-glutamyl transferase (GGT) levels have been demonstrated to be associated with poor prognoses in patients with coronary artery disease. Coronary computed tomography angiography (CCTA) is a noninvasive imaging modality that may differentiate the structure of coronary plaques. Elevated plaque burdens and noncalcified plaques, detected by CCTA, are important predictors of atherosclerosis in young adults.HypothesisThe present study investigated the possible relationship between GGT levels and coronary plaque burdens/structures in young adults with coronary atherosclerosis.MethodsCCTA images of 259 subjects were retrospectively examined, and GGT levels were compared between patients with coronary plaques and individuals with normal coronary arteries. Coronary plaques, detected by CCTA, were categorized as noncalcified, calcified, and mixed, according to their structures. The significant independent predictors of coronary atherosclerosis were also analyzed using multivariate logistic regression analysis.ResultsGGT levels were significantly higher in patients with coronary plaque formation than in controls (35.7 ± 14.7 vs 19.6 ± 10.0 U/L; P < 0.001). GGT levels were also positively correlated with the number of plaques; presence of noncalcified plaques; and levels of high-sensitivity C-reactive protein (hs-CRP), hemoglobin A1c, uric acid, and triglycerides. Moreover, smoking and levels of GGT, hs-CRP, uric acid, and low high-density lipoprotein cholesterol were independent predictors of coronary atherosclerosis.ConclusionsGGT is an inexpensive and readily available marker that provides additional risk stratification beyond that provided by conventional risk factors for predicting coronary plaque burdens and plaque structures in young adults.
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