Abstract
Background
The prognostic value of triglyceride-glucose (TyG) index is not yet known for older diabetic patients received right ventricular pacing (RVP). We aimed to investigate the association between TyG index and the risk of heart failure hospitalization (HFH) in older diabetic patients received RVP.
Methods
This study was conducted between January 2017 and January 2018 at Fuwai Hospital, Beijing, China, and included older (age ≥ 65 years) diabetic patients that received RVP for the first time. TyG index were obtained before implantation. The primary endpoint was HFH.
Results
A total of 231 patients were divided into three groups according to the tertiles of TyG index: < 8.5 (T1, N = 77), 8.5–9.1 (T2, N = 77), and > 9.1 (T3, N = 77). T3 group had higher rate of HFH (Log-rank = 11.7, P = 0.003). Multivariate analyses showed that, TyG index served as an independent predictor for HFH, both as numerical variable (HR = 1.94, 95% CI 1.21–3.11, P = 0.006), and as categorical variable (HR = 2.31, 95% CI 1.09–4.89, P = 0.03). RCS demonstrated that the risk of HFH was relatively low until TyG index exceeded 8.8, beyond which the risk began to increase rapidly (P-non-linear = 0.006).
Conclusion
Preimplantation TyG index emerges as a robust, independent predictor for HFH in older diabetic patients received RVP, and TyG index > 8.8 might be the optimal cut-off value.
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Background
With geriatric population expansion, more attention should be paid on age-related diseases. Aging is a risk factor for metabolic disease. There is a strong association between advanced age and type 2 diabetes mellitus (T2DM), as more than half of diabetic patients were constituted by those aged ≥ 65 years [1, 2]. In addition, T2DM adds additional folds of risk of heart failure (HF), as compared to those without DM [3]. Aging is also a risk factor for cardiac conduction abnormalities [4]. It was reported that in the US, the average age of receiving permanent pacemaker implantation (PPMI) was 73.3–77.5 years in 1993, and steadily increased overtime, reaching 75.4–80.1 years in 2009 [5]. Right ventricular pacing (RVP) is a commonly used pacing strategy, as it is easily accessible and provides stable lead position and low dislodgement rate [6]. However, high percentage of RVP in the long run is associated with abnormal conduction-induced cardiomyopathy and higher rate of heart failure hospitalization (HFH), featured by ventricular asynchrony, hemodynamic change, enlarged ventricles and declined cardiac function [7].
Insulin resistance (IR) is a state of decreased sensitivity and responsiveness to the action of insulin, playing a key role in the pathological mechanism of T2DM [8], and can be evaluated by triglyceride-glucose (TyG) index [9, 10]. Several studies have shown that TyG index is predictive of adverse clinical outcomes. In cardiovascular disease (CVD) patients with T2DM or pre-diabetes, baseline TyG index was associated with cardiovascular death and all-cause mortality [11]. A higher TyG index was also independently associated with incident HF in general population [12]. Nevertheless, whether higher TyG index is associated with worse cardiac function in older diabetic patients receiving RVP is yet unknown. Therefore, this study was design to explore the relationship between TyG index risk of HFH in older diabetic patients receiving RVP.
Methods
Study population
Patients older than 65 years, with the diagnosis of diabetes mellitus, and received RVP for the first time at Fuwai Hospital, Beijing, China, between January 2017 and January 2018 were retrospectively enrolled. There were 1938 patients received PPMI during the study period. After excluding patients aged < 65 years (N = 742), with pacemaker upgrade or replacement (N = 297), without diagnosis of T2DM (N = 665), and with missing values for triglyceride (N = 2). Eventually, 231 patients were included in this study (Fig. 1).
The study was approved by the Ethics Committee of the Chinese Academy of Medical Sciences, Fuwai Hospital (No. IRB2012-BG-006). The written informed consent was obtained from all the patients included in this study.
Data collection and TyG index measurement
Baseline data were extracted from the electronic medical recording system by two independent trained researchers. Any inconsistencies were confirmed by a third researcher.
Demographic information, including age, sex, body mass index, smoke, and alcohol use, past medical history, including sinus node dysfunction, atrioventricular block, hypertension, coronary artery disease, percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG), HF, atrial fibrillation (AF), stroke, and chronic kidney disease (CKD), and medical therapy, including angiotensin-converting enzyme inhibitor/angiotensin receptor blocker, β blocker, and statin were obtained upon admission. Physical examination and data of New York Heart Association class, systolic blood pressure, and diastolic blood pressure were recorded later on. The blood samples were collected in a fasting state by trained nurses on the admission day of hospitalization. Laboratory results, including white blood cells, neutrophils, lymphocyte, hemoglobin, platelet, albumin, alanine transaminase, aspartate transaminase, total bilirubin, direct bilirubin, fasting blood glucose (FBG), hemoglobin A1C (HbA1C), estimated glomerular filtration rate (eGFR), triglyceride, total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), and N-terminal pro-brain natriuretic peptide (NT-proBNP). Echocardiography performed before PPMI, including left atrium diameter, left ventricular ejection fraction (LVEF), left ventricular end-diastolic diameter, and left ventricular mass index, and pacing details, including pacing location and ventricular pacing proportion were also acquired.
TyG index was calculated as: ln[fasting triglycerides (mg/dL) × FBG (mg/dL)/2] before PPMI. Patients were stratified into three groups by the tertiles of TyG index: T1: 6.18–8.53 (N = 77), T2: 8.53–9.13 (N = 77), and T3: 9.13–11.36 (N = 77). The T1 group was set as the reference group.
Follow-up and study endpoints
The primary outcome of this study was HFH, which is defined any hospitalization necessitated by the new onset or exacerbation of HF symptoms and signs, with significantly elevated levels of NT-proBNP and requiring diuretic therapy. All patients were followed up until January 30th, 2022. The follow-up duration was calculated from the date of receiving RVP, to the data of first incident of HFH, or the data of follow-up deadline. The median follow-up duration was 53 months.
Statistical analysis
Numerical variables were expressed as mean ± standard deviation if they followed normal distribution, or as median (25th quartile, 75th quartile) if they were skewedly distributed. Categorical variables were expressed as number (percentage). Comparisons of numerical variables among T1, T2, and T3 groups were performed using one-way analysis of variance for those with normal distribution, or using Kruskal–Wallis test for those with skewed distribution, and comparisons of categorical variables were performed using Fisher's exact test or Chi-squared test. Post hoc pairwise comparisons of the variables that showed statistically significant differences across TyG tertiles were performed, using the Wilcoxon rank-sum test, with P value adjusted for multiple comparisons via the Bonferroni method. Kaplan–Meier curves were plotted to illustrate the cumulative incidence of HFH across the T1, T2, and T3 group, and Log-rank tests were employed to evaluate the differences among groups. Univariate Cox regression analysis was conducted to identify significant risk factors for HFH, which were incorporated in the multivariate Cox regression analysis. Model 1 was unadjusted. Model 2 with TyG index as a numerical variable and Model 3 with TyG index as a categorical variable, were both adjusted for age, sex, AF, CKD, PCI or CABG, baseline LVEF and LVMI. To evaluate the relationship between TyG index and HFH, Cox proportional hazards regression models with restricted cubic splines (RCS) were conducted. The optimal cut-off value for TyG index on predicting HFH was determined at the point where the HR in the RCS curve exceeded 0. Subgroup analyses were conducted based on age (≥ 75 or < 75 years), sex, AF, CKD, PCI or CABG, and baseline LVEF (≥ 60 or < 60%) and LVMI (≥ 95 or < 95 g/m2). For each stratified variable, adjustments were made to control for the potential influence of all remaining variables. The statistical data was analyzed via the R statistical software version 4.3.1. Two-tailed P value < 0.05 was considered statistically significant.
Results
Baseline clinical characteristics
The baseline characteristics of study population was shown in Table 1. A total of 231 patients were divided into three groups according to the tertiles of TyG index: < 8.5 (N = 77), 8.5–9.1 (N = 77), and > 9.1 (N = 77). The median age was 76 years and 48.5% were female patients. The median duration of T2DM was 10 years, and only one patient (0.4%) used sodium-glucose co-transporter-2 (SGLT-2) inhibitors. The mean TyG was 8.8 ± 0.6. Patients with higher TyG index had significantly higher levels of WBC, neutrophil, FBG, HbA1C, TC, and LDL-C, and lower levels of eGFR, and HDL-C, in comparison to those with lower TyG index (all P < 0.05). The incidence of HFH was significantly higher in the third tertile (14.3 vs. 13.0 vs. 32.5%, P = 0.003).
Relationships of TyG index with heart failure hospitalization
Kaplan–Meier analysis showed that TyG index > 9.1 had higher cumulative rate of HFH during follow-up period (Log-rank = 11.7, P = 0.003; Fig. 2). Univariate Cox regression analysis revealed that, as a numerical variable, TyG index was significantly associated with an elevated risk of HFH (HR = 2.12, 95% CI 1.33–3.37, P = 0.002; Table 2). As a categorical variable, TyG index in T3 group was significantly correlated with increased risk of HFH (HR = 2.54, 95% CI 1.25–5.16, P = 0.010; Table 2).
Multivariate Cox regression models were built to evaluate the independent association between TyG index and HFH. In model 2, where TyG index was adjusted as a numerical variable, TyG index served as an independent predictor for HFH, with each unit increase being associated with a 94% elevation in the risk of HFH (HR = 1.94, 95% CI 1.21–3.11, P = 0.006; Table 2). In model 3, where TyG was adjusted as a categorical variable, TyG index in T3 group was an independent predictor for HFH (HR = 2.31, 95% CI 1.09–4.89, P = 0.028; Table 2).
The detection of non-linear relationship
RCS curves were plotted to assess the non-linear relationship between TyG index and the risk of HFH. Overall, the risk of HFH was relatively low, until TyG index exceeded 8.8, beyond which the risk began to increase rapidly (P-non-linear = 0.006; Fig. 3). Similar non-linear relationships were also observed in male patients (P-non-linear = 0.048; Figure S1), patients with AF (P-non-linear = 0.047; Figure S2), and patients without CKD (P-non-linear = 0.046; Figure S3).
Subgroup analysis
To further evaluate the association between covariates and HFH, patients were stratified based on age, sex, AF, CKD, PCI or CABG, baseline LVEF and LVMI. The results of multivariate Cox regression analyses and forest plots were shown in Figure S4. In patients with age ≥ 75 years (HR = 1.79, 95% CI 1.002–3.18, P = 0.049), female gender (HR = 4.07, 95% CI 1.62–10.22, P = 0.003), AF (HR = 3.07, 95% CI 1.58–5.98, P = 0.001), baseline LVEF < 60% (HR = 3.07, 95% CI 1.004–9.42, P = 0.049), and patients without PCI or CABG (HR = 2.91, 95% CI 1.57–5.38, P = 0.001), TyG index were significantly associated with HFH. Specifically, there was significant interaction of TyG index with AF (P interaction = 0.030) and PCI or CABG (P interaction = 0.035).
Discussion
This study investigated the association between TyG index and HFH in older diabetic patients receiving RVP. Our results showed that, TyG index was positively correlated with increased risk of HFH, both as numerical and categorial variable. After adjusting possible confounding factors, TyG exhibited as an independent predictor for HFH. In addition, RCS curves revealed a non-linear relationship between TyG index and the risk of HFH; specifically, the risk of HFH was relatively low, until TyG index exceeded 8.8, beyond which the risk began to increase rapidly. To the best of our knowledge, the study was the first to demonstrate the potential usefulness of TyG index, a simple indicator of IR, on discriminating high risk for HFH in older diabetic patients receiving RVP.
IR is a key pathological mechanism in T2DM and a risk factor for CVD [10, 13]. Various methods exist for assessing IR. The hyperinsulinemic euglycemic clamp (HEC) technique is considered the most accurate, yet its complexity limits its use to small-scale research rather than large population studies. An alternative, the homeostasis model assessment of IR (HOMA-IR), correlates well with HEC results. However, the requirement for fasting insulin levels renders it less practical for widespread clinical use in community settings. Consequently, the TyG index has been developed. This index substitutes the measurement of insulin with triglycerides, facilitating a quicker evaluation of IR. Importantly, it retains a consistent correlation with HEC and HOMA-IR values, offering a more feasible approach for broad clinical application [14, 15].
TyG index has demonstrated significant clinical relevance in patients with T2DM. Zhang et al. [11] involved patients with T2DM and CVD, and revealed a positive correlation between TyG index and future CVD death and all-cause mortality. Wang et al. [16] recruited patients with T2DM and acute coronary syndrome, and found that a higher TyG index was associated with higher risk of major adverse cardiovascular events (MACEs), defined as all-cause death, non-fatal myocardial infarction, and non-fatal stroke. In patients with T2DM that underwent PCI, Chen et al. [17] was able to identify elevated TyG index as a feasible predictor for recurrent revascularization. In patients with T2DM and acute ischemic stroke, Liu et al. [18] showed that increased TyG index was strongly related to recurrency of ischemic stroke and all-cause death. Thus, it is essential to pay attention to TyG index in diabetic patients.
Additionally, TyG index has previously been shown to be effective in predicting health concerns such as critical delirium, frailty, and arterial stiffness in the elderly [19,20,21]. Despite these findings, research specifically targeting older diabetic patients remains scarce. Zhao et al. [22] identified a correlation between a high TyG index and increased mortality in elderly diabetic patients. Similarly, Huang et al. [23] focused on elderly female patients with diabetic foot ulcers and discovered a strong association between the TyG index and all-cause mortality, further underscoring TyG index’s potential as a valuable prognostic tool in older diabetic patients.
In regards to cardiac-related endpoints, high TyG index exhibited as a feasible predictor for heart failure development and exacerbation. In general population, TyG index has been identified as an independent risk factor for incident HF, as demonstrated in studies by Li et al. [12] and Xu et al. [24]. This correlation was also significant in patients who have undergone PCI and subsequently developed secondary mitral regurgitation. In Huang et al.’s study, an elevated preprocedural TyG index may signal an increased risk of worsening HF [25]. Adding to this, Zheng et al. [26] highlighted that prolonged exposure to high TyG index levels was associated with an escalated risk of HF. In the context of patients with T2DM, studies by Wang et al. [27] and Chen et al. [28] showed a significant association between the TyG index and subclinical cardiac function decline. Our study focused on older diabetic patients undergoing RVP, a group inherently more susceptible to declining cardiac function over time. In line with previous findings, we observed a positive correlation between TyG index and an increased risk for HFH in this specific cohort.
It is increasingly recognized that IR is closely associated with the development of cardiomyopathy. Primarily, IR leads to an excessive breakdown of triglycerides and release of free fatty acids from adipose tissue. These fatty acids circulate in the bloodstream, accumulate in cardiomyocytes, cause mitochondrial dysfunction and endoplasmic reticulum stress, and subsequently trigger the release of pro-inflammatory and fibrogenic mediators and activate fibroblasts, contributing to cardiac fibrosis [29,30,31,32]. Furthermore, IR plays a role in activating the renin–angiotensin–aldosterone system, producing oxidative stress, altering mitochondrial function, exacerbating cardiac diastolic dysfunction and cardiac remodeling [33, 34]. Lastly, IR adversely affects calcium handling, a critical factor in modulating myocardial contractility and relaxation. The impairment can also manifest as decreased cardiac diastolic function [35,36,37].
We also involved plotting RCS curves, which unveiled a non-linear relationship between the TyG index and the risk of HFH in the older diabetic population. Intriguingly, we observed that the risk of HFH remained relatively low until the TyG index surpasses 8.8. This non-linear relationship and the identified threshold align with findings from previous studies focusing on older population [19, 21, 22]. Some research even suggested a U-shaped relationship, indicating that both excessively low and high TyG index values were linked to poorer prognoses [11]. Our study did not detect a U-shaped association between TyG index and HFH, which may be due to several reasons. For one thing, the primary endpoint was different. Our results were similar to the majority of studies that focused on using TyG index to predict HF, where a U-shaped association was also not observed [24,25,26]. This suggests that the relationship between the TyG index and HF risk may follow a different pattern compared to cardiovascular or metabolic endpoints. For another, our study population all received RVP. The mechanisms of developing HF in our population may include pathological process like prolonged ventricular pacing, ventricular contraction asynchrony, and gradual cardiac function loss [38], which added complexity beyond what was typically seen in patients with advanced age, T2DM or CVD. Further research with larger sample size is required to determine whether a low TyG index is associated with adverse outcomes in older diabetic patients receiving RVP.
This study is subject to several limitations. Firstly, it is a retrospective cohort study with a relatively small sample size lacking variable such as SGLT-2 inhibitors use. Our findings, including the identified optimal threshold and the non-linear relationship between TyG index and HFH risk, should be verified in randomized-controlled trials (RCTs) involving larger populations. Secondly, while efforts were made to adjust for potential covariates, there might be residual confounding factors influencing the outcome. Thirdly, the underlying mechanisms driving the association between TyG index and HFH risk in the older diabetic patietns receiving RVP remain unclear. Experimental studies are essential to provide deeper insights into the biological processes and causal pathways involved, thereby enhancing our understanding of the role of TyG index in predicting compromised cardiac function.
Conclusion
Preimplantation TyG index was positively correlated with an increased risk of HFH in older diabetic patients receiving RVP, serving as an independent predictor even after adjusting for potential confounders. This correlation was observed both when TyG index was treated as a numerical and as a categorical variable. Notably, RCS curves identified a non-linear relationship between TyG index and HFH risk. The risk remained relatively low until the TyG index surpassed the threshold of 8.8, beyond which the risk escalated significantly. Therefore, our study underscored the potential utility of preimplantation TyG index in identifying a higher risk for HFH among older diabetic patients receiving RVP, allowing closer follow-up and timely management.
Data availability
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Abbreviations
- AF:
-
Atrial fibrillation
- CABG:
-
Coronary artery bypass grafting
- CKD:
-
Chronic kidney disease
- CVD:
-
Cardiovascular disease
- eGFR:
-
Estimated glomerular filtration rate
- FBG:
-
Fasting blood glucose
- HbA1C:
-
Hemoglobin A1C
- HDL-C:
-
High-density lipoprotein cholesterol
- HEC:
-
Hyperinsulinemic euglycemic clamp
- HF:
-
Heart failure
- HFH:
-
Heart failure hospitalization
- HOMA-IR:
-
Homeostasis model assessment of insulin resistance
- IR:
-
Insulin resistance
- LDL-C:
-
Low-density lipoprotein cholesterol
- LVEF:
-
Left ventricular ejection fraction
- NT-proBNP:
-
N-terminal pro-brain natriuretic peptide
- PCI:
-
Percutaneous coronary intervention
- PPMI:
-
Permanent pacemaker implantation
- RCS:
-
Restricted cubic splines
- RVP:
-
Right ventricular pacing
- T2DM:
-
Type 2 diabetes mellitus
- TC:
-
Total cholesterol
- TyG index:
-
Triglyceride-glucose index
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BQF and WH participated in the study design. BQF, YY, SJC, HH, TXL, JWY, MG, CC, XHC, and HXN participated in data collection and data cleaning. BQF performed the statistical analysis and constructed the manuscript, which was revised and approved by all the authors for publication.
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Fu, B., Yu, Y., Cheng, S. et al. Association between triglyceride-glucose index and the risk of heart failure hospitalization in older diabetic patients received right ventricular pacing: a retrospective cohort study. Acta Diabetol (2024). https://doi.org/10.1007/s00592-024-02322-0
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DOI: https://doi.org/10.1007/s00592-024-02322-0