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Prevalence estimates of the insulin resistance and associated prevalence of heart failure among United Status adults

BMC Cardiovascular Disorders volume 23, Article number: 294 (2023) Cite this article

Abstract

Background

The triglyceride glucose (TyG) index, a metric for estimating insulin resistance (IR), is linked with cardiovascular disease (CVD) morbidity and mortality among the population regardless of diabetic status. However, IR prevalence and the association between the TyG index and heart failure (HF) in Americans is unclear.

Methods

The Nation Health and Nutrition Examination Survey (NHANES) (2009–2018) dataset was used. IR was defined by homeostatic model assessment of insulin resistance (HOMA-IR) > 2.0 and 1.5. The TyG index was calculated as Ln [fasting triglycerides (mg/dL) × fasting glucose (mg/dL)/2]. A weighted logistic regression was applied to evaluate the association between the TyG index and the prevalence of HF.

Results

This study comprised 12,388 people, including 322 (2.6%) individuals with HF. The average prevalence of IR was found to be 13.9% and 22.7% for cutoff values greater than 2.0 and 1.5, respectively. HOMA-IR and the TyG index showed a moderate correlation (r = 0.30). There is a significant positive association between the TyG index and HF prevalence (per 1-unit increment; adjusted OR [aOR]: 1.34; 95% confidence interval [CI]: 1.02–1.76). Patients with higher TyG values were associated with a prevalence of HF (OR:1.41; 95% CI: 1.01,1.95) (quartiles 4 vs 1–3). The TyG index is associated with a higher prevalence of dyslipidemia, coronary heart disease, and hypertension but not a stroke (cerebrovascular disease).

Conclusions

Our results show that IR does not considerably increase from 2008 to 2018 in American adults. A moderate correlation is noted between HOMA-IR and the TyG index. TyG index is associated with the prevalence of HF, as were other cardiovascular diseases.

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Introduction

The homeostatic model assessment of insulin resistance (HOMA-IR) and the triglyceride glucose index (TyG index) are regarded as markers of insulin resistance (IR). As a circumstantial marker of IR, HOMA-IR is a relatively widely used approach in practice [1]; however, it is costly and unavailable in most laboratories in developing countries. The TyG index, which is considered a replacement marker of IR by emerging studies [2, 3], was calculated applying the formula Ln [fasting triglycerides (mg/dL) × fasting glucose (mg/dL)/2]. Thus, the TyG index is less expensive and easily available in clinical practice. Current studies have discovered an established association between the TyG index and several diseases, including hypertension [4], carotid atherosclerosis [5], stroke [6], CVD [7], and coronary artery stenosis [8]. However, in Americans, studies on the prevalence and associated cardiovascular risk of the TyG index are limited [9, 10].

The end stage of the majority of cardiovascular diseases is heart failure (HF), and its prevalence is rising. Based on the American Heart Association's Statistical Update in 2021, HF prevalence is predicted to include 6 million people, which is approximately 1.8% of the total US population [11]. Diabetes mellitus is regarded as a significant risk factor for the development and progression of HF [12]. IR has a key role in the progression of diabetes mellitus [3]. Furthermore, longitudinal cohorts have shown that independent of known risk factors, such as diabetes, IR can forecast the occurrence of HF among the general population [13,14,15].

Given this background, we targeted the general adult American population from 2009 to 2018 to evaluate the prevalence trend of IR, which was detected through the TyG index and HOM-IR, and explore the association of the TyG index with the prevalence of HF.

Methods

Data source and study population

The research is a cross-sectional study that used data from the Nation Health and Nutrition Examination Survey (NHANES) (2009–2018). The whole study workflow is exhibited in Fig. 1. The NHANES is a nationwide representative cross-sectional survey with a complex survey design that is conducted in the United States each year, involving approximately 5000 nationally representative people. The weighted analysis was applied to explain the complex sampling design of NHANES. We included participants > 18 years old who took part in NHANES 2009–2010, 2011–2012,2013–2014,2015–2016, and 2017–2018 cycle. Besides, subjects with missing data on fasting glucose, triglycerides, and HF were precluded from this study (N = 37,306). The study included 12,388 participants from 2009 to 2018. More information on the sampling and exclusion criteria is shown in Fig. 1.

Fig. 1
figure 1

Study selection from the National Health and Nutrition Examination Survey 2009–2018, workflow, and major findings of the present study. Abbreviations: NHANES: National Health and Nutrition Examination Survey; IR: insulin resistance; TyG index: triglyceride-glucose index; HOMA-IR: homeostatic model assessment of insulin resistance

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Data collection

The NHANES is conducted every 2-year, and the survey consists of interviews and physical examinations. Participants need to complete interviews, undergo physical examinations, and provide blood samples. The data about age, race and ethnicity, gender, education, marital status and economic status, and medical history was collected by a self-reported, standardized questionnaire [16].

Weight in kilograms divided by height in meters squared is used to compute the body mass index (BMI). After more than five minutes of rest, Systolic blood pressure (SBP) and diastolic blood pressure (DBP) was obtained by trained personnel using a mercury sphygmomanometer, and the average of three readings was recorded (in mmHg). Based on responses to surveys asking participants if they currently smoked cigarettes, smoking status was determined. Based on responses to surveys asking participants if they were drinking right now, drinking status was determined. Physical activity (PA) was determined according to answers to a survey about whether a subject was vigorously or moderately active in recreational activities and how much time they usually spend sitting every day.

Blood samples were taken at the mobile exam facility and stored at 20 °C before being sent to the central labs, where they used standard methods to measure total cholesterol (TC), high-density lipoprotein cholesterol (HDL), uric acid (UA), and creatinine (CR). For evaluating the fasting triglycerides, low-density lipoprotein cholesterol (LDL-C), glucose, and insulin were used 8-h fasting blood specimens were only obtained from a subset of survey subjects.

Coronary heart disease (CHD), stroke (cerebrovascular disease), and chronic kidney disease (CKD) were defined as previously diagnosed as CHD, stroke (cerebrovascular disease), and CKD, respectively. Diabetes mellitus was diagnosed based on fasting glucose levels ≥ 7.0 mmol/l [17], or the use of hypoglycemic medications, or a history of diabetes. Systolic blood pressure ≥ 140 mm Hg and/or diastolic blood pressure ≥ 90 mm Hg and use of antihypertensive medications, or a history of hypertension were used to diagnose hypertension. TC levels ≥ 240 mg/dL (6.2 mmol/L) [11], or the use of lipid-lowering drugs, or a history of dyslipidemia were all considered to be diagnostic criteria for dyslipidemia. The estimated glomerular filtration rate (eGFR) was determined using the algorithm used by the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) [18].

Definitions of triglyceride glucose index and homeostatic model assessment of insulin resistance

The TyG index is calculated using the equation Ln [fasting triglycerides (mg/dL) × fasting glucose (mg/dL)/2] [6]. The HOMA-IR was calculated using the formula fasting insulin (microU/L) x fasting glucose (nmol/L)/22.5 [19]. According to the previous study, the cut-off points of HOMA-IR for estimating the prevalence of IR were 2.0 and more than 75% HOMA-IR, respectively [20]. For evaluating the fasting triglycerides, LDL-C, glucose, and insulin were used 8-h fasting blood specimens were only obtained from a subset of survey subjects.

Ascertain of heart failure

Participants were assessed as having congestive heart failure due to one of the following reasons: if they answered “yes” to the question “Has a doctor or other health professional ever told you that you had congestive HF?”.

Covariate

The selected covariates consisted of age, gender, marital status (married, never married, other) race (Mexican American, other Hispanic, Non-Hispanic White, Non-Hispanic Black, other Race), education (primary school graduate or below, middle/high/special school, and college graduate or above), current smoking (yes or no), family monthly poverty level category (low, moderate, high), PA (moderate, vigorous), sedentary, BMI, LDL-C, eGFR, UA, the chronic disease (diabetes mellitus, hypertension, stroke, CKD, dyslipidemia).

Statistical analysis

Continuous variables were exhibited in the form of weighted means and standard error (SE), and categorical variables were reported as weighted frequency percentages [21]. The quartiles are used to convert the TyG index into categorical variables. The TyG index quartiles are Q1 (8.12), Q2 (8.12< 8.55), Q3 (8.55< 9.0), and Q4 (≥ 9.0). The Chi-squared test or Kruskal–Wallis H test was employed to compare the differences in population characteristics by TyG index quartiles.

The correlation between the HOMA-IR and the TyG index was evaluated using the Pearson correlation coefficient. Participants were divided into TyG quartiles. Binary weighted logistics regression analysis was used to evaluate the association between TyG index levels and HF, and the outcome was presented as odds ratios (ORs) and 95% confidence intervals (CIs) with three pre-defined models. Model I was adjusted based on age, sex, and race; model II was adjusted based on Model I, marital status, BMI, education status, LDL-C, eGFR, UA, diabetes mellitus, hypertension, and dyslipidemia; model III was adjusted based on Model II, stroke, CKD, family monthly poverty level category, moderate PA, sedentary, current smoking. Moreover, the restricted cubic spline curves were applied to evaluate the non-linear association between the TyG index and HF.

The sensitivity analyses were used to assess whether the results were stable. We assessed whether the employment of indicator variables for missing data (BMI, LDL-C, eGFR, UA, hypertension, and dyslipidemia) leads to bias by conducting a multiple-imputation analysis which is based on 5 replications and the Markov-chain Monte Carlo method [22]. We also performed sensitivity analyses using a complete-case analysis.

We performed the subgroup analyses for further exploration, the possible impact changes of the relationship between TyG index levels and HF were evaluated for the following factors: sex, age (< 60 vs ≥ 60 years), BMI (< 30 vs ≥ 30 kg/ m2), current smoking (yes vs no), eGFR (< 60 vs ≥ 60 ml/min/1.73m2), hypertension (yes vs no), diabetes mellitus (yes vs no), and stroke (yes vs no), dyslipidemia (yes vs no), family monthly poverty level category (low vs moderate, low vs high). The subgroup analysis was compared with the highest quartile and quartiles 1–3 to increase the statistic power. A two-sided p-value of < 0.05 was considered statistically significant in all analyses. All data analyses were performed using R software version 4.1.3 (www.R-project.org) and Empower version 2.2.0 (www.empowerstats.com, X&Y Solutions, Inc).

Results

Baseline characteristics of study participants

As Fig. 1 reveals, after excluding 37,306 patients with age ≤ 18 years old and missing data on exposure variables (fasting triglycerides and glucose) and HF. The present study has 12,388 participants. The distribution of the TyG index is displayed in Fig. 2. Baseline characteristics for study subjects stratified by the TyG index quartiles are exhibited in Table 1. Generally, the average (SE) age was 47.5 (0.3) years old. Most participants were non-Hispanic whites (65.3%), and 48.2% were males. Participants with higher TyG index levels were more likely to be males, older, smokers, Mexican American, married, poor economically, with lower education status, and with lower PA. Meanwhile, they have higher BMI, SBP, DBP, TC, LDL-C, eGFR, and UA, and lower HDL-C. And they have higher chronic diseases, including HF, hypertension, diabetes mellitus, CHD, stroke, CKD, and dyslipidemia (all p < 0.05).

Fig. 2
figure 2

The odds ratio and the histogram of the probability distribution for heart failure according to the triglyceride-glucose index. The red curve with a light black dotted line indicates the adjusted OR with a 95% CI for HF according to the TyG index with a reference of 8.5. The number of knots for the cubic spline curves was three in the model. Adjustment factors included age, sex, race, marital, BMI, education status, LDL-C, eGFR, UA, diabetes mellitus, hypertension, stroke, CKD, dyslipidemia, family monthly poverty level category, moderate PA, sedentary, and current smoking. Abbreviations: OR: odds ratio; CI: confidence interval; HF: heart failure; TyG: triglyceride-glucose index; BMI: body mass index; LDL-C: low-density lipoprotein cholesterol; UA: uric acid; CKD: chronic kidney dysfunction; eGFR: estimated glomerular filtration rate; PA: physical activity

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Table 1 Weighted baseline characteristics by the quartile of the triglyceride-glucose index of adult Americans from the Nation health and nutrition examination survey 2009–2018
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The prevalence values of Insulin resistance

From 2009 to 2018, the mean prevalence of IR was 1.3. The highest prevalence of IR was observed in 2013–2014, with 20.45% (cut off 2.0) and 31.3% (cut off 1.5) (Fig. 3 A-B), with a similar trend in terms of the TyG index and HOMA-IR(Fig. 3 C). HOMA-IR and the TyG index showed a moderately positive linear correlation (r = 0.30, P < 0.01). (Fig. 3 D). In addition, we investigated the trend of values of the TyG index stratified by demographic factors. As presented in Figure S1, the TyG index increased with age (Figure S1 A). Males had a higher TyG index than females (Figure S1 B). Regarding race, the TyG index level of Mexican Americans was greater than that of other races (Figure S1 C). Similar results of HOMA-IR were noted when patients were stratified by age, sex, and race.

Fig. 3
figure 3

The prevalence of insulin resistance, and the changing trend of homeostatic model assessment of insulin resistance and triglyceride-glucose index in adult Americans from the Nation Health and Nutrition Examination Survey 2009–2018. A-B: The prevalence of IR was defined as having a HOMA-IR greater than 2.0 (A) or 1.5 (B). C: An overview of the five NHANES cycles (2009–2018) that show the changing trend of the TyG index and HOMA-IR mean values. D: The correlation between the TyG index and HOMA-IR. Abbreviations: IR: insulin resistance; TyG index: triglyceride-glucose index; HOMA-IR: homeostatic model assessment of insulin resistance

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Triglyceride glucose index stratified by demographic-related factors

As Figure S2 shows, men exhibited a 1.76-times (95% CI: 1.53–2.01, P < 0.001) greater TyG index values than women. Compared with low education status, moderate education status, and high education status had a lower TyG index values of 0.79- times (95% CI: 0.69–0.90, P < 0.01) and a 0.67- times (95% CI: 0.56–0.79, P < 0.01), respectively. Compared to Mexican Americans, other Hispanics, non-Hispanic whites, non-Hispanic blacks, and other races had a lower TyG index of 0.70- times (95% CI: 0.57–0.85, P < 0.01), 0.62- times (95% CI: 0.54–0.70, P < 0.01), 0.25- times (95% CI: 0.21–0.30, P < 0.01) and 0.75- times (95% CI: 0.61–0.91, P < 0.01), respectively. Vigorous PA had a 0.71-fold (95% CI: 0.61–0.83, P < 0.001) lower TyG index than non-vigorous PA. Moderate PA had a 0.82- times (95% CI: 0.71–0.95, P < 0.001) lower TyG index than non-moderate PA. Current smoking was associated with a 1.31-fold (95% CI: 1.15–1.50, P < 0.001) higher TyG index than noncurrent smoking. Current drinking exhibited a 1.65-fold (95% CI: 1.36–2.02, P < 0.001) greater TyG index than non-current drinking.

Associations between the triglyceride glucose index and heart failure

HF prevalence was 2.6% (322/12388) among adults in the U.S. from 2009 to 2018. The TyG index was appraised as a categorical variable. Compared to participants in quartile 1 of the TyG index, those in quartiles 2, 3, and 4 had weighted multivariate-adjusted ORs of 0.91 (95% CI: 0.52–1.56), 1.13 (95% CI: 0.71–1.80), and 1.45 (95% CI: 0.87–2.41), respectively. After adjustment for age, sex, race, marital, BMI, education status, LDL-C, eGFR, UA, diabetes mellitus, hypertension, stroke, CKD, dyslipidemia, family monthly poverty level category, moderate PA, sedentary, and current smoking. The continuous variables analysis showed a positive association (per 1 unit increase; OR: 1.34; 95% CI: 1.02–1.76) (Table 2). As presented in Fig. 2, the relationship between the TyG index and HF seemed to be linear (P-non-linear = 0.23) after adjustments. Supplemental analysis revealed that subjects in quartile 4 of the TyG index (≥ 9) had a significantly higher prevalence of HF (OR: 1.41; 95% CI: 1.01–1.95) than those in quartiles 1–3 of the TyG index (< 9).

Table 2 Association of the triglyceride-glucose index with a prevalence of Heart failure in adult Americans from the Nation Health and Nutrition Examination Survey 2009–2018
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Association of the triglyceride-glucose index with other diseases

We found that the TyG index was remarkably associated with the increased prevalence of dyslipidemia (OR: 2.55; 95% CI: 2.31–2.81), CHD (OR: 1.41; 95% CI: 1.07–1.83), and hypertension (OR: 1.56; 95% CI: 1.43–1.70), after adjustment for age, sex, race, BMI, current smoking, marital status, Family monthly poverty level category, and education status. But the TyG index was not significantly associated with the increased prevalence of stroke (cerebrovascular disease) (OR: 1.07; 95% CI: 0.86–1.34). (Table S1).

Sensitivity analyses and subgroup analyses

The multiple imputation analysis generated consistent results (OR, 1.4; 95% CI, 1.1–1.7), suggesting that missing variables did not cause bias (Table S2).

Subgroup analyses were used to assess the association between the TyG index and HF in per-defined subgroups (Fig. 4). No significant interactions between the TyG index and sex, age, BMI, eGFR, hypertension, diabetes mellitus, stroke, current smoking, family monthly poverty level category, or dyslipidemia were noted (all p interactions > 0.1). In addition, we used a propensity score matching to strengthen our findings (OR = 1.52, 95%CI: 1.17, 1.98) (Table S3-S4). Meanwhile, sensitivity analysis additionally by adjusting hypoglycemic agents and lipid-lowering drugs showed the result was consistent with the main results (Table S5).

Fig. 4
figure 4

The association between the triglyceride-glucose index (Q4 vs. Q1-Q3) and heart failure in various subgroups after adjustments. The adjusted confounders were age, sex, race, marital status, BMI, education status, LDL-C, eGFR, UA, diabetes mellitus, hypertension, dyslipidemia, stroke, CKD, family monthly poverty level category, moderate PA, sedentary, current smoking (confounders were not adjusted if they were listed as a stratified factor in subgroups). Abbreviations: HF: heart failure; BMI: body mass index; TyG index: triglyceride-glucose index; LDL-C: low-density lipoprotein cholesterol; CKD: chronic kidney dysfunction; UA: uric acid; eGFR: estimated glomerular filtration rate; PA: physical activity

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Discussion

Major findings

The study is a large-scale cross-sectional study of US adults, our results showed that the IR prevalence estimated via the TyG index and HOMA-IR was stable in Americans from 2009 to 2018, but the prevalence was relatively higher from 2013–2014. A moderate positive correlation was observed between HOMA-IR and the TyG index. Males, low education, other races, lower PA, smoking, and drinking were all associated with a higher TyG index. Finally, our study found that the TyG index was associated with an increased risk of HF as well as other cardiovascular diseases.

As a simple and new marker, the TyG index was applied to assess the severity of IR among patients with diabetes mellitus [3]. A previous systematic review explored the risk of CVDs associated with the TyG index. However, it is primarily based on the East Asian population [9]. For example, a study from China illustrated a significantly positive association between the TyG index and adverse cardiovascular outcomes [23]. Another prospective study from Korea indicated that the TyG index was considered an independent factor in the prediction of the development of coronary artery calcification [24]. A study showed that the TyG index predicts adverse cardiovascular events among Chinese patients with diabetes and acute coronary syndrome independently of recognized cardiovascular risk factors [25]. In another cross-sectional survey that enrolled the Chinese elderly population, there is a significant association between the TyG index and hypertension, and compared to lipid and glycemic indices, the TyG index shows higher discriminative power for hypertension [26]. However, the evidence for TyG and associated cardiovascular risk based on general US adults is limited [27]. Based on a well-designed national survey, our study first explored the prevalence and associated HF and cardiovascular events with TyG in adult Americans.

Some studies show that the TyG index is moderately positively correlated with HOMA-IR [28, 29]. However, we found the correlation between the TyG index and HOMA-IR is lower and may be explained by the following reason. The main purpose of the study is to investigate the association between the TyG index and the prevalence of HF. Therefore, in the subject selection process, the individuals with missing HF information were excluded. Meanwhile, the population with diabetes or hyperlipidemia has been treated with lipid-lowering and hypoglycemic drugs, and the blood sugar and lipid levels are affected. Thus, there may be a reduced correlation between the TyG index and HOMA-IR.

From 2009 to 2018, diabetes prevalence in America has increased [30]. However, our study found that the prevalence of IR was stable in US adults. Several potential reasons may explain this inconsistency. First, to investigate the risk of HF associated with the TyG index, subjects with missing information on HF and the TyG index were deleted, which may reduce the representation of individuals from the US. Second, the population with type 2 diabetes was a relatively small proportion of the overall population in the present study (18.7%), which diluted the effect of IR reflecting the type 2 diabetes prevalence. Third, diabetes has two main forms, including type 1 and type 2, and IR has traditionally been related to type 2 diabetes. Type 2 diabetes is remarkably heterogeneous [31]. In some subgroups of patients with type 2 diabetes at the early stage, IR has not occurred or is not evident. Therefore, the prevalence of IR may not reflect diabetes prevalence. In a study of the diabetes prevalence based on race and ethnicity in the US, the results indicated that diabetes prevalence varies by race and ethnicity, and Mexican Americans exhibited the highest prevalence of total diabetes [32]. Our results found that the TyG index was the highest among Mexican Americans. Variations in the diabetes prevalence between races/ethnicities could be due to physiological differences [32].

IR has an important pathophysiologic role in type 2 diabetes, and IR is frequently prevalent in HF patients [33]. In addition, a study also demonstrated that IR was an indicator of deterioration in heart function [34]. A meta-analysis showed the association between IR and the risk of HF developing after adjusting for traditional risk factors (RR: 1.08; 95% CI: 1.04–1.11). This association has persisted in studies involving individuals with and without diabetes [35]. Our results further reinforced these studies.

Obesity has been identified as a major risk factor for HF. According to the Framingham Heart Study, increases in BMI of 1 kg/m2 increased the risk of HF by 5% in men and 7% in women [36]. This finding may emphasize the necessity of a weight-specific control measure to prevent HF. In the subgroup analysis, we found no significant association between the TyG index and HF in the population with BMI < 30 kg/m2 (OR = 1.20, 95% CI: 0.88–1.63). However, the interaction was not significant for obesity. The findings demonstrated that the TyG index is a risk factor for HF independent of obesity. Another vital effect modifier is diabetes mellitus. A meta-analysis reported the adverse cardiovascular events among coronary artery disease patients associated with the TyG index, and the risk between TyG and the primary outcome (including HF) was consistent in patients with and without diabetes mellitus (with diabetes mellitus: HR = 2.49, 95% CI: 1.86–3.34; without diabetes mellitus: HR = 1.95, 95% CI: 1.20–3.17) [37]. Our study included 10,058 people who did not have diabetes mellitus and 2,330 diabetes mellitus patients. The subgroup results indicated the association between a high TyG index and HF in diabetes mellitus (OR = 1.55, 95% CI: 1.02–2.37). In the normal population, the association became nonsignificant (OR = 1.19, 95% CI: 0.95–1.50). Although a nonsignificant interaction was found, more studies are needed to ascertain the interaction between diabetes mellitus and the TyG index.

Our results showed the association between the TyG index and the prevalence of CHD, diabetes mellitus, hypertension, dyslipidemia, and CKD. These results were compatible with another research [4, 6, 7]. However, the TyG index was not significantly associated with the increased risk of stroke. Our result is not consistent with existing research. Zhao et al. showed that in the general population, the TyG index is an independent predictor of ischemic stroke [38]. Zhao et al. conducted a prospective cohort study in rural China, enrolling only people over the age of 40. However, our study enrolled US adults exhibiting a greater age range. This feature may explain why our results are not consistent with those of Zhao et al. [38].

Comparisons with previous studies

Our finding is in line with earlier studies. There is a significant association between the TyG index and an increased prevalence of CVD incidence, which was more outstanding among the young people [39]. Our results showed that the TyG index is significantly associated with an increased risk of HF in the younger population (age < 60 years), although insignificant interactions are noted between the TyG index and age.

Guo et al. demonstrated the adverse events in HF patients with type 2 diabetes associated with the TyG index. Compared with the lowest TyG index group, the highest TyG index group has a higher risk of adverse events in HF (HR: 2.15, 95% CI: 1.37–3.35) [40]. Yang et al. revealed that a higher TyG index is associated with all-cause death or HF rehospitalization (HR = 2.01, 95% CI: 1.03–4.01) [41]. Our study first reported i) ten-year data on IR epidemiological trends revealed a moderately positive correlation between HOMA-IR and the TyG index in general US adults; and ii) the TyG index and the prevalence of HF were positively associated, as were other cardiovascular diseases.

Underlying mechanism

The association between the TyG index and increased risk of HF may be explained as follows: First, maintaining myocardial function is dependent on glucose uptake and metabolism, and the bioavailability of glucose is limited by IR, leading to myocardial energy acquisition from fatty acid metabolism [42]. These changes result in fatty acid accumulation, which causes lipotoxicity and worsens HF through mitochondrial dysfunction and apoptosis [43]. Second, IR is associated with chronic inflammation, arterial stiffness and coronary artery calcification, which prompts cardiomyocyte injury, and fibrosis, impairing both diastolic and systolic functions [44]. Third, IR has been demonstrated to stimulate the sympathetic nervous system [45] and the renin–angiotensin–aldosterone system [46]. Both above systems are associated with myocardial fibrosis and cardiac dysfunction [44, 47]. Fourth, calcium has a key role in regulating mitochondrial function [48] and cardiac diastolic function [49], but IR can weaken cardiac calcium processing capacity [47] (Figure S3).

Clinical practices

Our finding has may clinical importance for the prevention of the development of HF in the general population. In practice, HOMA-IR has been the most broadly applied method [3]. There are studies that have demonstrated that the TyG index is superior to the HOMA-IR for predicting IR, type 2 diabetes, and coronary artery stenosis [3, 50, 51]. In our study, the participants with higher TyG index levels were associated with having a higher prevalence of HF. Therefore, the TyG index may be applied to the risk stratification of those with a high risk of HF. The TyG index has a relatively low cost as a marker of HF events in clinical practice. Meanwhile, in subgroup analysis, we found that diabetes has no potential effect modifications of the relationship between TyG index levels and HF. This showed that the TyG index used to evaluate the IR could be considered for routine utilization. As we know, IR is considered an early stage in the development of diabetes, and IR could be reversible by intervention [52]. Some studies have shown that hypoglycemic agents can alleviate the prognosis and ameliorate cardiac remodeling or dysfunction in people who do not have diabetes [53, 54].

Limitations

Several potential limitations should be mentioned. First, as a cross-sectional study. Thus, this research does not imply causality. Second, HF-related data were gathered from self-reported information, and patients with undiagnosed HF were not included. Meanwhile, because the selection population could have some bias, this may lead to the prevalence of IR being calculated inaccurately. Third, some patients with missing TyG and HF data were excluded from the present study, which largely reduced the sample size from the original cohort. Therefore, all the above two points may cause selection bias. Fourth, we only obtain baseline information about the TyG index. As a result, we were unable to determine whether managing the TyG index might improve participant prognosis. Meanwhile, to eliminate the confounders in the multivariate analysis, we have involved as many clinically relevant variables as possible. However, the potential confounder likelihood remained. Finally, this study was based on American data, and the generalizability of these findings to other regions requires further research.

Conclusion

This study revealed that the prevelence of IR did not significantly increase from 2009 to 2018 among American. A moderate correlation is noted between HOMA-IR and the TyG index. The present study suggests an association between the TyG index and prevalence of HF among the general American population, and more studies are needed to assess the predictive ablity of TyG index and the HF incidence.

Availability of data and materials

The datasets generated and/or analyzed during the current study are available in the NHANES repository,https://www.cdc.gov/nchs/nhanes/

The datasets used and analyzed during the current study are available from the corresponding author upon reasonable request.

Abbreviations

TyG index:

Triglyceride glucose index

CVD:

Cardiovascular disease

HF:

Heart failure

NHANES:

National health and nutrition examination survey

IR:

Insulin resistance

BMI:

Body mass index

SBP:

Systolic blood pressure

DBP:

Diastolic blood pressure

PA:

Physical activity

HDL-C:

High-density lipoprotein cholesterol

UA:

Uric acid

CKD-EPI:

Chronic kidney disease epidemiology collaboration

eGFR:

Estimated glomerular filtration rate

CR:

Creatinine

TC:

Total cholesterol

LDL-C:

Low-density lipoprotein cholesterol

CHD:

Coronary heart disease

CKD:

Chronic kidney dysfunction

OR:

Odds ratio

CI:

Confidence interval

HOMA-IR:

Homeostatic model assessment of insulin resistance

SE:

Standard error

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Acknowledgements

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Funding

This work was supported by the National Natural Science Foundation of China (No. 81760050, 81760048, 82100273, 82100347), the Jiangxi Provincial Natural Science Foundation for Youth Scientific Research (No. 20192ACBL21037), Natural Science Foundation of Guangdong Province (2022A1515010582), and Guangzhou Science Technology Bureau (202102010007).

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  1. Xiaozhong Li and Jihong Wang are co-first author.

Authors and Affiliations

  1. Department of Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China

    Xiaozhong Li, Jihong Wang, Liyan Niu, Ziqi Tan & Juxiang Li

  2. Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA

    Jianyong Ma

  3. Department of Geriatrics Medicine, the Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China

    Ling He

  4. Department of Endocrinology Medicine, the Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China

    Peng Yu

  5. Department of Cardiology, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University, Guangzhou, 510080, Guangdong, China

    Xiao Liu

  6. Guangzhou Key Laboratory of Molecular Mechanism and Translation in Major Cardiovascular Disease, Guangzhou, 510120, Guangdong, China

    Xiao Liu

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Contributions

X. Z-L participated in the data analysis, and data interpretation, and wrote the manuscript. J.H-W data interpretation. L.Y- N, Z.Q-T, J.Y-M, L-H, and P-Y conceived the study and participated in its design and coordination. X-L participated in the study design, and wrote the manuscript. J. X-L participated in the study design, and provided critical revision. All the author(s) read and approved the final manuscript.

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Additional file 1

: Table S1. Association of the triglyceride-glucose index with the prevalence of specific cardiovascular diseases in adult Americans from the Nation Health and Nutrition Examination Survey 2009-2018. Table S2. Sensitive analysis of the association between the triglyceride-glucose index and the prevalence of heart failure in adult Americans based on the multiple-imputation analysis. Table S3. Baseline characteristics after propensity score matching of adult Americans from the Nation Health and Nutrition Examination Survey 2009-2018. Table S4. The associations of the triglyceride-glucose index with the prevalence of heart failure in the propensity score matched from the Nation Health and Nutrition Examination Survey 2008-2018. Table S5. The associations of the triglyceride-glucose index with the prevalence of heart failure after adjusted hypoglycemic agents, and lipid-lowering drugs from the Nation Health and Nutrition Examination Survey 2008-2018. Figure S1. The weighted mean values of the triglyceride-glucose index in adult Americans from the Nation Health and Nutrition Examination Survey 2009-2018. A: The weighted mean values of the triglyceride-glucose index of different age stages; B: The weighted mean values of the triglyceride-glucose index of a different gender; C: The weighted mean values of the triglyceride-glucose index of different races. Bar graphs and error bars represent weighted mean ± SE. Figure S2. Risk factor association with the triglyceride-glucose index. Figure S3. The maybe underlying mechanism of insulin resistance-induced heart failure.

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Li, X., Wang, J., Niu, L. et al. Prevalence estimates of the insulin resistance and associated prevalence of heart failure among United Status adults. BMC Cardiovasc Disord 23, 294 (2023). https://doi.org/10.1186/s12872-023-03294-9

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BMC Cardiovascular Disorders

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