Graphical abstract

INTRODUCTION

Non-alcoholic fatty liver disease (NAFLD), the hepatic manifestation of ectopic fat accumulation caused by abdominal obesity and insulin resistance, is a well-known risk factor for cardiovascular disease (CVD), which is the leading cause of death in patients with steatohepatitis [1,2]. In particular, the risk of NAFLD increases in patients with type 2 diabetes mellitus (T2DM); NAFLD affects approximately 70% of the T2DM population [3]. However, it is currently unclear whether simple steatosis without hepatic fibrosis is associated with a higher CVD risk [4]. In a previous study of patients with T2DM, the risk of atherosclerosis progression was significantly higher in NAFLD patients with advanced liver fibrosis; however, no significant increase in risk was identified in simple steatosis without advanced liver fibrosis [5]. Therefore, the selection of patients with high CVD risk within the T2DM patient group with NAFLD can be an important clinical issue. However, it is not easy to determine whether hepatic fibrosis, the representative risk factor of high CVD risk, exists because of limited diagnostic modalities, such as liver biopsy or magnetic resonance elastography.

The loss of muscle mass and muscle function, known as sarcopenia, is part of a physiologic aging process, and is usually exacerbated by low physical activity, malnutrition, and inflammatory conditions [6]. Recent studies revealed a close relationship between NAFLD and sarcopenia, suggesting that sarcopenia is an independent risk factor for NAFLD [7]. Han et al. [8] reported that NAFLD and sarcopenia were independently associated with an increased risk of atherosclerotic CVD in a large-scale cross-sectional study. The risk of subclinical atherosclerosis assessed by carotid ultrasonography has also been reported to increase with sarcopenia in patients with NAFLD in a cross-sectional analysis [9].

Because muscle is the major organ for glucose disposal after a meal, the loss of muscle mass consequently results in insulin resistance [10,11], and insulin resistance is a characteristic feature of both T2DM and NAFLD [12]. However, although NAFLD and sarcopenia share a common mechanism in the pathogenesis of insulin resistance, little is known about the longitudinal effects of NAFLD with or without sarcopenia on systemic atherosclerosis in T2DM. In this study, we aimed to evaluate whether sarcopenia with NAFLD leads to an increased risk of CVD in an Asian population with T2DM. To evaluate the CVD risk, the progression of carotid atherosclerosis for 6 to 8 years was evaluated.

METHODS

In this study, we analyzed data from the Seoul Metabolic Syndrome Cohort, wherein 13,296 patients were diagnosed and treated for T2DM from November 1997 to September 2016 at Huh’s Diabetes Center as previously described [13,14]. The patients were diagnosed with T2DM according to the American Diabetes Association criteria [15]. Among T2DM patients in the cohort, those aged ≥19 years who had undergone carotid artery ultrasonography repeatedly for up to 6–8 years were enrolled. Patients with bilateral carotid artery plaques at baseline were excluded because it was difficult to confirm new-onset plaques during the follow-up period in those patients. Patients were also excluded based on the following criteria: (1) age <19 years; (2) diagnosis of type 1 diabetes mellitus; (3) pregnancy; (4) diagnosis of liver disease other than NAFLD, such as viral or autoimmune hepatitis and hepatocellular carcinoma; and (5) history of heavy alcohol consumption (>140 g/week).

The final participants included 852 patients who underwent abdominal ultrasonography, bioelectrical impedance analysis, and carotid artery ultrasonography at baseline and repeated carotid artery ultrasonography after 6 to 8 years. Written informed consent was obtained from all participants, and the Ethics Committee of Inha University Hospital approved this study (2021-08-026).

Measurements and definitions of clinical and laboratory parameters

We collected baseline information of the patients, including their medical and family history, smoking and alcohol consumption history, medication use, and physical activity level per week. Anthropometric measurements, including weight, height, and waist circumference (WC) were performed. Venous blood samples were drawn from participants (1) after 8 hours of fasting, and (2) 2 hours after a meal. The metabolic parameters including glycosylated hemoglobin (HbA1c), lipid profiles (total cholesterol, triglyceride, high-density lipoprotein cholesterol [HDL-C], and low-density lipoprotein cholesterol [LDL-C]), blood urea nitrogen, creatinine, aspartate aminotransferase/alanine aminotransferase (AST/ALT), and albumin were measured using routine laboratory methods on fresh samples on the same day of collection. The estimated glomerular filtration rate (eGFR) was calculated using the Chronic Kidney Disease Epidemiology Collaboration creatinine equation [16]. Patients underwent a short insulin tolerance test to calculate the rate constant for plasma glucose disappearance (KITT; %/min), which is a marker of insulin sensitivity [17]. Regular alcohol consumers were defined as individuals who drank twice a month or more, and those who had ever smoked five or more packs of cigarettes were considered ever-smokers. Regular exercise was defined as moderate to vigorous physical activity at least once per month for at least 30 minutes. Obesity was defined as a body mass index (BMI) ≥25 kg/m² according to a scientific statement from the World Health Organization [18]. Central obesity was defined as WC ≥90 cm for men and ≥85 cm for women according to the Korean standard for central obesity [19].

Liver status and body composition measurements

Participants underwent abdominal ultrasonography after 8 hours of fasting to assess whether they had hepatic steatosis (iU22, Philips Healthcare, Andover, MA, USA, using a 3.5- MHz transducer after 8 hours of fasting). As previously described, the degree of steatosis was assessed semi-quantitatively (absent, mild, moderate, or severe), and NAFLD was defined as the presence of hepatic steatosis on ultrasound [7]. The body composition of the participants was assessed using a segmental multi-frequency bioelectrical impedance analysis system (InBody 4.0, InBody Co. Ltd., Seoul, Korea). The appendicular skeletal mass (ASM) was calculated as the sum of lean muscle mass in bilateral upper and lower limbs, and the skeletal muscle mass index (SMI) was calculated by dividing the ASM by body weight in kg (SMI=ASM/body weight×100%) and subsequently expressed as a percentage [20]. Sarcopenia was defined as an SMI (%) <2 standard deviations (SDs) below the gender-specific mean for healthy young adults in the Korean population: SMI (%) <29.0 in men and <22.9 in women was considered as sarcopenia [21].

For sensitivity analysis, a different definition of sarcopenia, sarcopenia_height, which was calculated by dividing the ASM by height² in m² was used. Sarcopeniaheight was defined as an ASM/height² <7.0 in men and <5.7 in women [22].

Carotid atherosclerosis measurements

All participants underwent repeated carotid ultrasonography to assess the carotid atherosclerosis status. We compared the progression of atherosclerosis at baseline and at 6 to 8 years. Both common carotid arteries were examined using high-resolution ultrasonography (LOGIQ7, GE Healthcare, Chicago, IL, USA) by trained technicians who were blinded to the patients’ clinical and laboratory data. The middle and distal common carotid arteries were scanned as described previously [5]. The presence of carotid plaque was defined as meeting any one of the following criteria: (1) carotid intima-media thickness (CIMT) of 1.5 mm or higher; (2) protrusion of atherosclerosis into the lumen of the artery with ≥50% thickness compared to the surrounding area; and (3) presence of distinct areas of hyperechogenicity [23]. The progression of carotid atherosclerosis was defined as the appearance of newly developed carotid plaque lesions on repeated ultrasonography.

Statistical analysis

The baseline characteristics of the study participants were analyzed according to the presence of NAFLD and sarcopenia. The patients were divided into four groups: no NAFLD or sarcopenia, NAFLD only, sarcopenia only, and NAFLD with sarcopenia. All categorical variables were expressed as numbers (proportions) and compared using the chi-square test. Continuous variables were expressed as mean±SD and analyzed with one-way analysis of variance (ANOVA) for intergroup comparison, followed by the Bonferroni test for post hoc analysis. Multivariable logistic regression analysis was performed to calculate the odds ratio (OR) of carotid atherosclerosis progression according to the presence of NAFLD with or without sarcopenia. Various confounding factors were adjusted in a stepwise manner: age and sex were adjusted in Model 2; BMI, follow-up duration, smoking, alcohol consumption, history of hypertension, and exercise were adjusted in Model 3; eGFR, diabetes mellitus (DM) duration, and HbA1c were adjusted in Model 4; use of statins, LDL-C, triglycerides, HDL-C, and history of cardio-cerebrovascular disease in Model 5. In addition, a subgroup analysis was performed to assess the factors influencing the association between the coexistence of sarcopenia in patients with NAFLD and carotid atherosclerosis progression. A logistic regression analysis was performed to detect the association between sarcopenia and carotid atherosclerosis progression after dividing patients with NAFLD into two subgroups by age (60 years), sex, DM duration (6 years, median value of study population), central obesity (WC; 90 cm for men and 85 cm for women), and BMI (obesity: 25.0 kg/m²). Statistical significance was set at P<0.05; additionally, all statistical analyses were performed using IBM SPSS Statistics version 26.0 (IBM Corp., Armonk, NY, USA).

RESULTS

A total of 852 patients with T2DM were enrolled in this study. Of the 852 patients, 456 had NAFLD and 189 had sarcopenia. Patients with NAFLD showed a higher prevalence of sarcopenia than those without NAFLD (27.0% vs. 16.7%, P<0.001) (Fig. 1A). However, the difference of prevalence of sarcopenia between the groups was inverse when we used another definition of sarcopenia (19.5% vs. 29.3%, P=0.001) (Fig. 1B). The baseline characteristics of the participants are shown in Table 1. Patients with both NAFLD and sarcopenia showed significantly greater body weight, BMI, WC, and visceral fat than those in the other groups (all P<0.05). In addition, the proportion of central obesity and hypertension was significantly higher in patients with both NAFLD and sarcopenia (all P<0.05). AST and ALT were significantly greater and insulin sensitivity measured by KITT was significantly lower in those with NAFLD, regardless of sarcopenia (all P<0.05).

The mean CIMTs (mm) at baseline were 0.76±0.15, 0.77±0.15, 0.74±0.14, and 0.79±0.14 in patients with no NAFLD/sarcopenia, NAFLD only, sarcopenia only, and NAFLD with sarcopenia, respectively (P=0.042). The numbers of participants with carotid plaques at baseline were 115 (34.8%), 107 (32.1%), 19 (28.8%), and 46 (37.4%) in patients with no NAFLD/sarcopenia, NAFLD only, sarcopenia only, and NAFLD with sarcopenia. It was not significantly different among the four subgroups (P=0.567).

After a mean of 7 years of follow-up, plaque progression was confirmed in 291 of 852 participants, and the number in each group were 86 (26.1%), 109 (32.7%), 35 (53.0%), and 61 (49.6%) in patients with no NAFLD/sarcopenia, NAFLD only, sarcopenia only, and NAFLD with sarcopenia, respectively (P<0.001). The association between the presence of NAFLD/sarcopenia and carotid plaque progression after multistep adjustments is shown in Table 2. Age, sex, BMI, follow-up duration, smoking, alcohol consumption, history of hypertension, exercise, eGFR, T2DM duration, HbA1c, use of statins, LDLC, triglyceride, HDL-C, and history of cardio-cerebrovascular disease were sequentially adjusted. In the NAFLD with sarcopenia group, a consistently significantly higher OR was confirmed compared to the control group (no NAFLD or sarcopenia) after adjustment (adjusted OR [aOR], 2.2; 95% confidence interval, 1.21 to 4.00; P=0.01). In addition, the same result was also confirmed in the sensitivity analysis which used a different definition (sarcopenia_height) (Table 2).

There were 271 patients who followed both abdominal ultrasonography and segmental multi-frequency bioelectrical impedance analysis simultaneously after 6 to 8 years of follow-up. There was no change in group classification in most patients, however, a high proportion of patients with sarcopenia without NAFLD developed new NAFLD (Supplementary Table 1).

In the subgroup analysis that included only patients with NAFLD, we further analyzed the relative risk of carotid plaque progression depending on the presence of sarcopenia after dividing the patients into two subgroups by other clinical characteristics, such as age, sex, diabetes duration, presence of central obesity, and BMI. As shown in Fig. 2, patients with sarcopenia had a significantly higher risk of carotid plaque progression in women, non-obese patients (BMI <25 kg/m²), and patients without central obesity (all P interaction <0.05).

DISCUSSION

This study included repeated carotid ultrasonography data of 852 T2DM patients for up to 6–8 years and demonstrated sarcopenia as an important risk factor for CVD in T2DM patients with NAFLD. T2DM patients with NAFLD had a higher prevalence of sarcopenia than those without NAFLD. When sarcopenia was accompanied by NAFLD in T2DM patients, the risk of carotid artery plaque progression was higher than when both NAFLD and sarcopenia were not present. In a subgroup analysis that included only patients with NAFLD, patients with sarcopenia who were women, without central obesity, and non-obese showed significant association with a high-risk of carotid plaque progression.

Previous studies have shown that sarcopenia and NAFLD are closely associated, and that patients with sarcopenia have an increased risk of NAFLD [24-26]. Although the causal relationship between NAFLD and sarcopenia is still unclear, it has been suggested that they share a similar mechanism that facilitates metabolic abnormalities [7]. Skeletal muscle is the primary tissue responsible for peripheral glucose disposal, and loss of muscle mass can lead to high insulin resistance. Insulin resistance subsequently increases adipocyte lipolysis, aggravates lipotoxicity, and accelerates the development of steatohepatitis [27]. In turn, the accumulation of fatty acids within the liver induces hepatic insulin resistance, creating a vicious cycle between insulin resistance and fatty liver. In this study, patients with both NAFLD and sarcopenia had the highest homeostatic model assessment for insulin resistance and lowest KITT, suggesting impaired insulin sensitivity. However, the prevalence of sarcopenia according to the presence of NAFLD in this study was different depending on the definition of sarcopenia. Therefore, the association between sarcopenia and NAFLD may vary according to the adjustment method used to define sarcopenia and cautious interpretation may be needed.

The measurement of CIMT has been widely used to assess atherosclerosis and to evaluate CVD risk [28,29]. Additionally, there have been some reports that carotid plaque burden assessment can be superior to CIMT for predicting CVD events [30]. The evaluation of carotid plaques may be more clinically useful, especially in studying longitudinal changes in carotid atherosclerosis [31,32]. In this study, we evaluated the prevalence of carotid plaques and their subsequent progression. Patients with both NAFLD and sarcopenia had a significantly higher risk of carotid plaque progression; however, those with NAFLD without sarcopenia did not have any significantly meaningful results compared to the control group without NAFLD or sarcopenia. The underlying mechanism has not been elucidated; however, the chronic inflammation observed with sarcopenia could be a possible explanation. In previous studies, appendicular skeletal muscle mass had an inverse correlation with the high-sensitivity C-reactive protein level, the biomarker for inflammation [33,34]. The reactive oxygen species produced in inflammatory conditions mediates a number of signaling pathways that promote atherogenesis [35]. Additionally, visceral obesity, NAFLD, and atherosclerosis are closely related [36]. In this study, the patients with both NAFLD and sarcopenia had the highest visceral fat area. This could be a major mechanism of NAFLD with sarcopenia leading to carotid atherosclerosis. A number of studies have reported that sarcopenia is related to significant hepatic fibrosis in patients with hepatic steatosis [37,38], and hepatic fibrosis is known to be a more potent risk factor for CVD [39]. We can speculate that patients with sarcopenia are prone to have hepatic fibrosis, which leads to carotid atherosclerosis. In a previous cross-sectional study, the combination of hepatic fibrosis and sarcopenia additively increased the risk of CVD in the NAFLD population [8].

In patients with NAFLD in this study, those who were female, without central obesity, and were non-obese were likely to have increased carotid artery plaque progression risk, when presented with sarcopenia. Without central obesity, which is the well-known CVD risk factor, the presence of sarcopenia significantly contributed to an increased risk of atherosclerosis progression. Therefore, concurrent measurements of sarcopenia might offer an advantage in predicting high CVD risk in patients with T2DM and NAFLD, particularly in lean women without obesity. Obesity is independently associated with CVD and accelerates atherosclerosis even without other risk factors [40,41], and the role of sarcopenia in carotid plaque progression could be attenuated in these obese patients. In addition, Asians tend to have lower skeletal muscle mass, but have more visceral fat compared with other ethnicities with similar BMIs [42]. Fracanzani et al. [43] reported that nonobese NAFLD is associated with visceral obesity and insulin resistance. Although non-obese patients with NAFLD might not be obese according to BMI cut-offs, they still have metabolic derangements that result in NAFLD, and may even have a more aggressive form of NAFLD with a worse clinical outcome, including mortality [44].

Our study had several strengths. First, we obtained the long-term follow-up results of carotid ultrasonography in patients with T2DM. Although previous studies also analyzed carotid ultrasonographic results, most of the study designs were crosssectional and, thus, it was difficult to demonstrate a longitudinal association. Second, because this hospital-based cohort study was conducted at a single institution, all the patients were managed and evaluated under the same standardized conditions and practices. As a limitation of the current study, the evaluation of NAFLD or sarcopenia was conducted only at baseline in most subjects. Therefore, the effects of changes in NAFLD status or muscle mass could not be analyzed. In addition, adjustments to other metabolic indicators and several event variables that changed during the study period may not be sufficient. Variables such as the use of anti-platelet agents that were not collected in this database may also affect the final result. Although ultrasonographic examination used in the diagnosis of NAFLD is not a highly accurate method, it can be effectively used in a large population-based cohort. However, it was difficult to determine the relationship with hepatic fibrosis owing to the absence of histological information.

In conclusion, sarcopenia combined with NAFLD was an independent risk factor for carotid artery plaque progression in patients with T2DM. This increased risk was more prominent and significant in women, without central obesity, and in non-obese patients. Screening for NAFLD and sarcopenia would contribute to the prediction of high-risk groups for CVD in patients with T2DM, even in the absence of obesity.

SUPPLEMENTARY MATERIALS

NOTES

CONFLICTS OF INTEREST

No potential conflict of interest relevant to this article was reported.

AUTHOR CONTRIBUTIONS

Conception or design: Y.C., H.S.P., S.H.K.

Acquisition, analysis, or interpretation of data: Y.C., H.S.P., B.W.H., Y.L., S.H.S., D.H.S., S.H.A., S.H., S.H.K.

Drafting the work or revising: Y.C., H.S.P., S.H.K.

Final approval of the manuscript: Y.C., H.S.P., B.W.H., Y.L., S.H.S., D.H.S., S.H.A., S.H., S.H.K.

FUNDING

This work was supported by a research grant from the Inha University.

Acknowledgements

None

Fig. 1.

Prevalence of sarcopenia in study participants, grouped according to the presence of hepatic steatosis. (A) Sarcopenia_weight was defined as skeletal muscle mass index (SMI, %) <2 standard deviations below the gender-specific mean for healthy young adults in the Korean population: SMI (%) <29.0 in men and <22.9 in women was considered as sarcopenia. (B) Sarcopenia_height was defined as an appendicular skeletal mass/height² ratio <7.0 in men and <5.7 in women. NAFLD, non-alcoholic fatty liver disease.

Fig. 2.

Odds ratio of carotid plaque progression by subgroups. Risk of carotid plaque progression according to the presence of sarcopenia in participants with non-alcoholic fatty liver disease (NAFLD) stratified by age (≥60 years), sex, diabetes mellitus (DM) duration (≥6 years, study median), central obesity (waist circumference ≥90 cm for men and ≥85 cm for women), and body mass index (BMI; ≥25 kg/m²). CI, confidence interval.

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About this article

Cho Y, Park HS, Huh BW, Lee Yh, Seo SH, Seo DH, Ahn SH, Hong S, Kim SH. Non-Alcoholic Fatty Liver Disease with Sarcopenia and Carotid Plaque Progression Risk in Patients with Type 2 Diabetes Mellitus. Diabetes Metab J. 2023;47(2):232-241.

Received: Dec 15, 2021; Accepted: Mar 18, 2022

DOI: https://doi.org/10.4093/dmj.2021.0355.

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