- Original investigation
- Open Access
Association between abdominal adiposity and subclinical measures of left-ventricular remodeling in diabetics, prediabetics and normal controls without history of cardiovascular disease as measured by magnetic resonance imaging: results from the KORA-FF4 Study
Cardiovascular Diabetology volume 17, Article number: 88 (2018)
Local, abdominal fat depots may be related to alterations in cardiac function and morphology due to a metabolic linkage. Thus, we aimed to determine their association with subtle cardiac changes and the potential interaction with hyperglycemic metabolic states.
Subjects from the general population and without history of cardiovascular disease were drawn from the Cooperative Health Research in the Region of Augsburg FF4 cohort and underwent 3 T cardiac and body MRI. Measures of abdominal adiposity such as hepatic proton-density fat fraction [PDFFhepatic], subcutaneous (SAT) and visceral abdominal fat (VAT) as well as established cardiac left-ventricular (LV) measures including LV remodeling index (LVCI) were derived. Associations were determined using linear regression analysis based on standard deviation normalized predictors.
Among a total of 374 subjects (56.2 ± 9.1 years, 58% males), 49 subjects had diabetes, 99 subjects had prediabetes and 226 represented normal controls. Only subtle cardiac alterations were observed (e.g. LVCI: 1.13 ± 0.30). While SAT was not associated, increasing VAT and increasing PDFFhepatic were independently associated with increasing LVCI (β = 0.11 and 0.06, respectively), decreasing LV end-diastolic volume (β = − 6.70 and 3.23, respectively), and decreasing LV stroke volume (β = − 3.91 and − 2.20, respectively). Hyperglycemic state did not modify the associations between VAT or PDFF and LV measures (interaction term: all p ≥ 0.29).
In a healthy population, VAT but also PDFFhepatic were associated with subclinical measures of LV remodeling without evidence for a modifying effect of hyperglycemic state.
Diabetes, particular type-2 diabetes, threatens the health of a large number of individuals and is associated with worse prognosis, mainly because of increased risk for adverse cardiovascular events [1, 2]. Beside patients with manifest diabetes, there is a relevant number of patients with impaired glucose metabolism who do not satisfy diabetes criteria, and who are considered as pre-diabetics since they often progress into type-2 diabetes and have a higher risk of cardiovascular events [3, 4]. Thus, risk assessment is a crucial objective in this cohort in order to identify patients who could benefit from prevention.
A potential risk marker as well pathophysiological interlink are local fat depots such as visceral abdominal fat adipose tissue (VAT) or hepatic steatosis given stepwise higher levels between normal, pre-diabetic and diabetic patients . Beside storage of lipids, adipose tissue has pro-inflammatory characteristics by secreting cytokines [6, 7]. However, epidemiological evidence demonstrated that VAT and not subcutaneous adipose tissue (SAT) was specifically associated with cardiovascular risk factors and coronary heart disease . Also evidence from previous studies indicated that VAT was associated with left-ventricular (LV) morphology and/or function [9,10,11,12,13,14,15,16,17,18,19], often superior and/or independently of SAT or body mass index (BMI) [17, 18]. This was shown in non-diabetic patients by Rider et al.  where an independent association of increased VAT with decreased LV function was observed. Neeland et al.  demonstrated a correlation of VAT and LV morphology in obese and non-obese patients independently of the diabetes status. A sub-study of the MESA cohort including 4364 subjects, both insulin resistance and waist-to-hip-ratio (WHR)—a rough surrogate for VAT, were associated with concentric LV remodeling, a precursor to heart failure, both independent of BMI . In a smaller subgroup of the MESA study with available abdominal CT scan, direct measures of VAT by CT were also associated with concentric LV remodeling . Park et al.  pointed out an independent and synergistic association of VAT and skeletal muscle mass on LV mass and function in a Korean cohort study and noted that study participants with insulin resistance had more VAT. Given the potential association of local fat depots, particular VAT, to LV remodeling but also to diabetes , an influence of the diabetic status on the association between VAT and LV remodeling is suggestive and needs to be further examined.
Thus, our primary aim was to study the association of VAT with measures of LV morphology and function in a population free of previously known cardiovascular disease, potentially independent of cardiovascular risk factors and other measurements of obesity. Our secondary aim was to determine whether these associations are affected by hyperglycemic metabolic state.
Study design and population
The study was designed as a case–control study nested in a prospective cohort from the “Cooperative Health Research in the Region of Augsburg” (KORA) in which subjects with diabetes, with prediabetes and controls recruited from the FF4 follow-up of the KORA S4 study underwent whole-body MR imaging. The study design, sampling method and data collection are described in detail elsewhere [5, 21]. Briefly, subjects were excluded if there was history of cardiovascular disease defined as validated/self-reported stroke, myocardial infarction or revascularization. In addition, subjects with non-MRI safe devices including e.g. cardiac pacemaker or implantable defibrillator, report of cerebral aneurysm clip or serum creatinine ≥ 1.3 mg/dL were excluded.
The study was approved by the institutional review board of the medical faculty of Ludwig-Maximilian University Munich and all participants provided written informed consent.
Subjects of the KORA S4 cohort were re-examined between June 2013 and September 2014 at the KORA study center. An oral glucose tolerance test was administered to all participants who had not been diagnosed for type-2 diabetes. For the definition of pre-diabetes, the 1998 World Health Organization criteria were applied . Subjects with prediabetes had an impaired glucose tolerance (IGT) as defined by a normal fasting glucose concentration and a 2-h serum glucose concentration measured by oral glucose tolerance test (OGTT) ranging between 140 and 200 mg/dL and/or impaired fasting glucose (IFG), as defined by a fasting glucose level between 110 and 125 mg/dL and a normal 2-h serum glucose concentration. Individuals with a 2-h serum glucose concentration measured by OGTT above 200 mg/dL and/or a fasting glucose level above 125 mg/dL were classified as newly diagnosed diabetics. Subjects with normal glucose metabolism with a 2-h serum glucose concentration measured by OGTT below 140 mg/dL and a fasting glucose level below 110 mg/dL were classified as normal controls.
Other established risk factors were collected in standardized fashion as part of the KORA study design and described elsewhere . Briefly, hypertension was defined as systolic blood pressure of at least 140 mmHg or diastolic blood pressure of at least 90 mmHg or current antihypertensive treatment. Subjects were classified as smokers if they had smoked at least one cigarette per day in the year prior to the study. BMI was defined as weight (kg) divided by the height squared (m2). Medications were assigned as ‘antihypertensive medication’ only if the compounds taken were classified as antihypertensively effective by the most recent guidelines. Antithrombotic medication comprised anticoagulants and antiplatelet drugs. Lipid lowering medication was defined as treatment with statins, fibrates or other lipid modifying agents.
Magnetic resonance imaging
MR images were acquired using a 3 T Magnetom Skyra (Siemens AG, Healthcare Sector, Erlangen Germany) equipped with a whole-body coiling system. All subjects underwent the imaging protocol within 3 months after the visit at the study center. The whole-body protocol is described in detail elsewhere . All image analyses were performed in blinded fashion by independent readers unaware of the diabetic status and clinical covariates on dedicated off-line workstations.
Assessment of abdominal adipose tissue by magnetic resonance imaging
VAT and SAT were estimated at the umbilical level on a single axial slice since this approach is representative for the total amount of abdominal adipose tissue . The amount of abdominal fat was measured on an axial reconstructed 3D VIBE-Dixon image (5 mm slice thickness) in cm2 and segmented by an automated procedure based on fuzzy-clustering .
Assessment of hepatic lipids by magnetic resonance imaging
For determination of hepatic lipid content, a multi-echo Dixon-VIBE sequence was used with 6 T (1.23, 2.46, 3.69, 4.92, 6.15, 7.38 ms) accounting for T2* decay and the spectral complexity of fat (slice thickness 4 mm) [25, 26]. Using OsiriX (Version 4.1), a manual region of interest was drawn at the level of the portal vein excluding the hilus and large vessels for estimation of Pearson’s correlation coefficients .
Assessment of cardiac function and morphology by magnetic resonance imaging
The cine-SSFP sequences were evaluated semi-automatically using commercially available software (cvi42, Circle Cardiovascular Imaging, Calgary, Canada). Following automatic contour detection of the LV endocardium, all borders were corrected manually, if necessary. LV myocardial mass (LVM), LV end-diastolic volume (LVEDV), LV end-systolic volume (LVESV) and ejection fraction (LVEF) were derived accordingly to current guidelines . LV concentricity index (LVCI) was calculated as ‘LVM/LVEDV’, an abnormal increased LVCI was defined > 1.3 g/mL . LV stroke volume (LVSV) was calculated as ‘LVEDV–LVESV’. The parameters LVM, LVEDV, LVESV, and LVSV are indexed based on body surface area (BSA) for all analyses. LV hypertrophy was defined increased LVM (≥ 96 g/m2 [women] and ≥ 116 g/m2 [men]) ; eccentric vs. concentric LV hypertrophy was based on an abnormal LVCI.
Subject demographics, cardiovascular risk factors and MR outcomes are presented for the overall study sample and according to VAT tertiles as means and standard deviations for continuous variables and counts and percentages for categorical variables. Measurement differences among VAT tertiles were evaluated by one-way ANOVA and χ2 test, respectively. Correlations between abdominal fat and LV measures were displayed by scatter plots and Pearson’s correlation coefficients were provided.
Associations of abdominal fat with LVM, LVCI, LVEDV and LVSV were assessed by separate linear regression models with β-coefficients and 95% confidence intervals (CI). Abdominal fat parameters were modelled as standard deviation increments. Regression models were adjusted (a) for age and sex, (b) for age, sex and BMI and (c) fully. For the fully adjusted model, covariates beyond age, sex and BMI were selected based on univariate analysis (Appendix Table 4; all with p < 0.10); the fully model included hypertension, diabetes, triglycerides, HDL (for all LV parameters), additionally LDL (for LVCI, LVEDV, and LVSV) and lipid lowering medication (for LVM, and LVCI). As a sensitivity analysis, the fully adjusted models were repeated with a fixed set of typical cardiovascular risk factors (including age, sex, BMI, hypertension, diabetes, and smoking status) and with a fixed set of typical cardiovascular risk factors replacing the definition of hypertension by actual measures of systolic and diastolic blood pressure and the presence of antihypertensive medication (including age, sex, BMI, systolic blood pressure, diastolic blood pressure, antihypertensive medication, diabetes, smoking).
Furthermore the conjoint associations of abdominal fat parameters with LVCI, LVEDV and LVSV were estimated by age, sex and BMI adjusted linear regression model. Forrest plots were drawn and model-fit was expressed by R2.
A multiplicative interaction effect of diabetes status (normal controls, prediabetic and diabetic subjects) on the association between VAT and LV measures was tested. In addition, associations between VAT and LV measures were separately analysed for the diabetes groups by age and sex adjusted linear regression models and by boxplots of LVCI across tertiles of VAT including a trend test.
A p value of < 0.05 was considered to indicate statistical significance. All analyses were conducted with Stata 14.1 (Stata Corporation, College Station, TX, USA).
A total of 400 subjects without clinically known cardiovascular disease underwent MR imaging and complete VAT and LV measurements were available in 374 subjects. Excluded subjects did not differ from the included subjects with respect to age, gender or diabetic status (all p ≥ 0.36). Of the final cohort (age 56.2 ± 9.1 years, 58% males), 49 subjects had diabetes, 99 subjects had prediabetes and 226 represented normal controls. Based on MRI measurements, mean VAT was 147.31 ± 85.02 cm2 with lower tertile from 11.06 to < 98.94 cm2, mid tertile from 98.94 to < 175.79 cm2 and upper tertile from 175.79 to 456.36 cm2. Demographic and risk profiles—stratified by VAT tertiles—are provided in Table 1. VAT was highly interlinked with other measures of adiposity (Table 1).
LV morphology and function and its correlation with adiposity
Measures of LV morphology and function are provided in Table 1. In this low-risk population and based on the MRI-based LVM measurements, LV hypertrophy was observed in four subjects—two with concentric and two with eccentric remodeling. In addition, three subjects had increased LVCI levels with normal LVM.
A stepwise increase was observed for LVM and LVCI across tertiles of VAT, while VAT decreased for LVEDV and LVSV (Table 1). LVEF was not different between VAT tertiles. Correlations between LV measures and MR-measures of adiposity are illustrated in Fig. 1; interestingly while for LVCI, LVEDV and LVSV all measures of adiposity were significantly correlated, only VAT was significantly correlated with LVM. Overall, strongest correlation was between VAT and LVCI (r = 0.54, p < 0.0001).
Multivariable analysis of the association between abdominal adiposity and LV measures
The associations of VAT, SAT and PDFFhepatic with LVM, which were observed in univariable analysis (Table 1), were attenuated after adjustment for age and gender (all p ≥ 0.21, Table 2). Further, none of the fat depots were associated with LVEF in any of the multivariate models (all p ≥ 0.14).
In contrast, the association of VAT and PDFFhepatic with LVCI, LVEDV and LVSV persisted in all models adjusting for all potential confounders (Table 2). While LVCI increased with increasing amount of fat, the association of LVEDV and LVSV were inversely associated with abdominal fat. Comparing VAT and PDFFhepatic in the association to LV measures, the effect size per standard deviation of VAT was larger than for PDFFhepatic throughout all LV measures and models.
Conversely, SAT was associated with LVCI and LVEDV in a basic model taking into account for age and gender, however attenuated by adjusting for BMI additionally. SAT and LVSV remained associated with LVDV also in a model including BMI and became borderline non-significant only in a fully adjusted model (p = 0.07). However, the effect size of SAT remained always below the effect size of PDFFhepatic and even more below VAT (Table 2). These findings did not change substantially in sensitivity analysis for including different sets of potential confounders (Appendix Table 5).
In a model adjusting for age, gender, and BMI and all abdominal fat depots, both VAT and PDFFhepatic provided independent and incremental value of predicting LVCI, LVEDV and LVSV (Fig. 2). While these six variables resulted in an r-square of 0.21 and 0.23 for LVSV and LVEDV respectively, the r-square was 0.33 for LVCI.
Effect of the diabetic status on the observed associations
Assessing the association between VAT and LV measures in the subgroups of subjects with diabetes, prediabetes and controls, similar trends were observed as in the overall cohort, for example between VAT and LVCI (Fig. 3). The predefined interaction term to test whether the hyperglycemic metabolic status effects the association between VAT and LV measures was non-significant (all p ≥ 0.29; Table 3). Similarly, there was no effect modification between HbA1c-Levels and the association between VAT and LV measures (all p ≥ 0.12).
In this nested case–control MRI study from the prospective, population-based KORA cohort in subjects without history of cardiovascular disease, we observed an independent association of VAT and PDFFhepatic to LVCI, a measure of early LV remodeling, but also to LVEDV and LVSV, a potential indicator for diastolic dysfunction. In contrast, no independent association was observed for abdominal adiposity to LVM nor for SAT to any of the LV measures. Furthermore, hyperglycemic metabolic state did not modify the association between abdominal adiposity and LV measures.
Association of abdominal adiposity to LV remodeling
There is increasing evidence that abdominal adiposity is associated with worse metabolic state and cardiovascular complications . Predominantly, this effect can be attributed to the amount of VAT as shown in a growing number of clinical and epidemiological studies, while SAT appears a more innocent bystander [11, 14, 15, 19, 29]. Our results add to the growing body of data by confirming an independent association for VAT to measures of LV remodeling, but not for SAT. Thus, our results support previous findings on the highly relevant role of VAT and extend these to a relatively large western European population.
LV remodeling index as the ratio between LVM and LVEDV is an important MR-based cardiac measure representing a precursor of heart failure and worse outcome . Prior research by Abasi et al. , which was derived from the MESA cohort, similarly observed increased LV remodeling indices in subjects with higher VAT level. In line with the MESA cohort, our cohort also excluded history of cardiovascular disease. Their finding also demonstrates a subtle increase in LVCI, much smaller than observed in other studies, such as the Dallas heart study . In a relatively small cohort of 75 nondiabetic men, Granér et al.  showed that hepatic triglyceride as measured by MR spectroscopy and VAT were associated with dedicated, echocardiography based measures of LV diastolic dysfunction. Diastolic dysfunction caused by hypertrophy in which filling is impaired due to low ventricular compliance may result in reduced LVEDV while both LVSV and LVEDV can be reduced without significant impact on LVEF. Accordingly, we found an association of abdominal adiposity with both, LVSV and LVEDV but not with LVEF, which may indicate that abdominal adiposity may affect more strongly the diastolic than systolic function in a first pathophysiologic step.
As described above, previous evidence on the association between hepatic steatosis and LV remodeling on a population-based cohort level is rare, given that most studies such as MESA or FHS employed CT to determine VAT and SAT and liver density in Hounsfield units by CT. However, CT represents only limited methods for assessment of adipose tissue content of the liver parenchyma  and it was only recently that rapid but robust and accurate multi-echo Dixon MR sequences became available . As such, we demonstrate that MR-based PDFFhepatic is independently and incrementally associated with subtle changes of LV remodeling, particular beyond VAT and independent of diabetes.
In a case–control study including 19 adults with type 2 diabetes, 19 adults with non-alcoholic fatty liver disease (NAFLD) and 19 healthy controls, Dr. Cassidy et al.  showed that changes in cardiac structure are related with both, diabetes and NAFLD, even without overt cardiac disease and without changes in cardiac energy metabolism. They postulated an interaction between NAFLD and diabetes with a two-hit hypothesis . However, we couldn’t reveal any evidence for an interaction of diabetes with PDFFhepatic regarding LV remodeling.
Beside overlapping risk factors for developing NAFLD and developing cardiovascular disease, there are several pathophysiological hypotheses of a more direct linkage . NAFLD is associated with an atherogenic lipid profile with e.g. the increased production of triglyceride-rich very-low-density lipoprotein (VLDL) particles is increased . Similar, the modification of cytokines including plasminogen activator inhibitor 1, adiponectin or interleukin 6, have been described in the association with NAFLD, and more strongly with non-alcoholic steatohepatitis . Also, it has been shown that endothelial dysfunction occurs in experimental studies after a few days of high-fat feeding, when steatosis has developed but inflammation has not . Nevertheless, indirect linkage of NAFLD to cardiovascular disease across NAFLD as a player in the development of diabetes and the metabolic syndrome must be recognized as well . Thus, further study is hence needed to gain mechanistic insight into the pathophysiology of the hepatic steatosis and LV structural changes as well as cardiovascular disease.
Metabolic connection between abdominal adiposity and LV remodeling
It is important to note that our cohort has a relatively limited size compared to MESA (n = 1151) or Dallas heart study (n = 2710). However, due to the nested design, our population had a higher percentage of patients with prediabetes (27%) and diabetes (13%) than the other two population-based cohorts (in MESA: 9 and 4% and Dallas heart study: N/A and 11%; respectively). Despite this increased power to detect difference, we did not reveal any interaction of the diabetic status on the correlation of VAT and LV-parameters even though Shah et al. and Canepa et al. [13, 18] suggested a metabolic connection between the interactions of VAT and LV parameters. Thus, our finding are in line with Rider et al.  who described insulin as an exemplary serum marker in diabetes for predicting LVM and Neeland et al.  who noted that the correlation between VAT and LV are independent of adipocytokines and insulin resistance. Also, our results add to the hypothesis by Shah et al.  that insulin resistance serves as a confounder in the interaction of obesity and LV remodeling as the correlation of BMI and LV parameters attenuated after multivariable adjustment (e.g. waist-to-hip-ratio). We confirm these observations by demonstrating that clearly VAT but not SAT is associated with subtle LV impairment. Similarly, a cardio-metabolic connection for NAFLD has been postulated by VanWagner et al.  As measured by CT, subclinical LV remodeling by echocardiography strain analysis from the multicenter, community-based coronary artery risk development in young adults (CARDIA) study was associated with LV parameters; however, in contrast, our data demonstrate that VAT is much more strongly associated with subclinical myocardial dysfunction as compared to PDFFhepatic. Clearly, further studies are needed to yield a better understanding of the metabolic connection of abdominal adiposity and cardiac parameters.
Our results do not imply causality because of the cross-sectional study design and need to be confirmed in longitudinal studies. Also, since the KORA cohort is single-centered, generalizability and external validity of our findings must be confirmed in the future. Because of the limited sample size and certain small subgroups (e.g. subjects with low VAT but presence of diabetes) we might lack statistical power to demonstrate significant interaction of diabetes in the association between VAT and LV remodeling.
In conclusion, particularly VAT but also fatty liver parenchyma are independently and incrementally associated with early changes of LV remodeling in a general western population without history of cardiovascular disease. Although a metabolic connection is suggestive, no interaction with the diabetic status was revealed for these important associations.
body mass index
body surface area
impaired fasting glucose
impaired glucose tolerance
Cooperative Health Research in the Region of Augsburg
left-ventricular concentricity index
left-ventricular end-diastolic volume
left-ventricular ejection fraction
left-ventricular end-systolic volume
left-ventricular myocardial mass
left-ventricular stroke volume
nonalcoholic fatty liver disease
oral glucose tolerance test
- PDFFhepatic :
hepatic proton-density fat fraction
subcutaneous adipose tissue
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CLS, SA, AP, BL and FB conceived and planned the experiments. HH was responsible for image acquisition and carried out together with CA and JM image analysis; while BL and WG was responsible for stratification of clinical covariates. RL and CLS conducted statistical analyses. CLS, CA, AP and FB contributed to the interpretation of the results. CLS took the lead in writing the manuscript. All authors provided critical feedback and helped shape the research, analysis and manuscript. All authors read and approved the final manuscript.
We acknowledge financial support by Deutsche Forschungsgemeinschaft within the funding programme Open Access Publishing, by the Baden-Württemberg Ministry of Science, Research and the Arts and by Ruprecht-Karls-Universität Heidelberg.
The authors declare that they have no competing interests.
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Consent for publication
All authors approved the current version of the manuscript.
Ethics approval and consent to participate
The study was approved by the institutional review board of the medical faculty of Ludwig-Maximilian University Munich and all participants provided written informed consent.
The KORA study was initiated and financed by the Helmholtz Zentrum München—German Research Center for Environmental Health, which is funded by the German Federal Ministry of Education and Research (BMBF) and by the State of Bavaria. The study was funded by the German Research Foundation (DFG, Bonn, Germany), the German Centre for Diabetes Research (DZD, Neuherberg Germany), and the German Centre for Cardiovascular Disease Research (DZHK, Berlin, Germany).
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Schlett, C.L., Lorbeer, R., Arndt, C. et al. Association between abdominal adiposity and subclinical measures of left-ventricular remodeling in diabetics, prediabetics and normal controls without history of cardiovascular disease as measured by magnetic resonance imaging: results from the KORA-FF4 Study. Cardiovasc Diabetol 17, 88 (2018) doi:10.1186/s12933-018-0721-0
- Magnetic resonance imaging
- Intra-abdominal fat
- Fatty liver
- Ventricular remodeling
- Diabetes mellitus