Hypertriglyceridemia, an important and independent risk factor for acute pancreatitis in patients with type 2 diabetes mellitus
Received 13 February 2017
Accepted for publication 18 March 2017
Published 13 April 2017 Volume 2017:13 Pages 515—522
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Professor Garry Walsh
Oana Albai,1 Deiana Roman,2 Mirela Frandes2
1Second Department of Internal Medicine, 2Department of Functional Sciences, “Victor Babes” University of Medicine and Pharmacy, Timisoara, Romania
Purpose: Acute pancreatitis (AP) is a frequent inflammatory disease of the pancreas with multiple causes, among which high triglyceride (TG) level is the most common. The main purpose of this study has been to research the prevalence of AP in patients with diabetes mellitus (DM) and to underline the importance of hypertriglyceridemia (HTG) as a risk factor in triggering AP. The possible link between AP and glycemic control has been studied also, alongside some cardiovascular risk factors and long-term diabetes complications.
Patients and methods: The patient cohort comprised 1,586 patients with DM, admitted to the Internal Medicine Clinic of Diabetes, Nutrition and Metabolic Disease within the Emergency Hospital in Timisoara between January and August 2016. Following a series of clinical and biological investigations, these patients were diagnosed with AP. The patients’ antidiabetic treatment and chronic diabetes-related complications have also been recorded.
Results: The prevalence of pancreatitis in this group of patients was 3.7%. The presence of pancreatitis was associated with a higher HbA1c (8.5% vs 7.7%; P<0.001), fasting glycemia (167.5 vs 95 mg/dL; P<0.001), postprandial glycemia (244.5 vs 118 mg/dL; P<0.001), total cholesterol (256.5 vs 189.5 mg/dL; P<0.001), low-density lipoprotein cholesterol (LDLc) (208.7 vs 112.8 mg/dL; P<0.001), and TGs (495 vs 161 mg/dL; P<0.001). HDL cholesterol (HDLc) was found to be a significant protective factor against the risk of pancreatitis. On the contrary, high LDLc values were a significant risk factor for pancreatitis along with high non-HDLc and high TG values, respectively.
Conclusion: The development of AP events in patients with DM is associated with unsatisfactory glycemic control, HTG, hypertension, and the presence and severity of DM chronic complications. In this study, the prevalence of AP events in patients with DM was 3.7%.
Keywords: diabetes mellitus, hypertriglyceridemia, acute pancreatitis, insulin resistance
Acute pancreatitis (AP) is an inflammatory disease of the pancreas, being one of the most frequent and severe gastrointestinal conditions requiring hospital admission. In the USA, the annual cost of AP-related admissions is ~$2.6 billion. Worldwide, the incidence of AP ranges between 4.9 and 73.4 cases per 100,000 individuals annually.1
The incidence of AP increases with age in both women and men, >60% of cases being recorded in adults. Also, the frequency of AP is two- to threefold higher in the Afro-American population, compared to the Caucasian population.2,3
AP has multiple causes, alcohol abuse and gallstone migration in the common bile duct being listed as the main two. Gallstones can consist of cholesterol or biliary matter that consolidates in solid masses which obstruct the pancreatic canals, leading to the accumulation of pancreatic liquid and prompting the pancreatic inflammatory process.4
Alcohol abuse is the second cause of AP, having an increased frequency in the middle-aged population, peaking between the age of 45 and 55 years. Alcohol has toxic metabolic effects on pancreatic acini. The mechanisms that determine these effects are the obstruction of small ducts, precocious enzymatic activation, the altering of blood flow, altering of the mobility of Oddi’s sphincter, and the stimulation of colecystokinin and secretin secretion.5
Increased triglyceride (TG) values represent another extremely important cause of AP, values over 1,000 mg/dL being accompanied by a very high risk of AP. Although the exact mechanism is unknown, it seems that the toxic effects are a consequence of TG being hydrolyzed in short-chain fatty acids. HTG can be inherited or, more frequently, it can be the effect of an inadequate diet.6
Other causes of AP are represented by medication, smoking, invasive exploratory procedures (ERCP), infections, hypercalcemia, trauma, and neoplastic processes.7–9 AP represents a potential life-threatening medical emergency requiring hospitalization, investigations, monitoring, and treatment. The most common onset involves acute abdominal pain, nausea, and severely altered general status.10
The final diagnosis is set based on laboratory tests (increased values of lipase and amylase), whereas for establishing the severity and the presence of complications, medical imaging techniques such as abdominal ultrasound, computed tomography, or magnetic resonance imaging are necessary. In AP, the endocrine function of the pancreas is affected, altering the carbohydrate metabolism. This is the reason for which high levels of glucose represent a disease severity factor, being included in the RANSON score of AP severity and mortality.11
Diabetes mellitus (DM) is a chronic, heterogeneous disease with a progressive evolution and multiple complications, its incidence being cited to have an important increase in the latest years.12 Besides the two main types of diabetes (type 1 and type 2), secondary types have been identified, among which one of the leading causes is represented by pancreatic diseases such as AP, chronic pancreatitis (CP), cystic fibrosis, or pancreatic cancer. It has been proven that the risk of developing DM significantly increases 5 years after the first AP episode.13
Insulin deficiency and/or insulin resistance, present in various degrees in the diabetic patient, contribute to quantitative and qualitative modifications in all lipoprotein (LP) classes. The characteristics of dyslipidemia in diabetic patients are hypertriglyceridemia (HTG); increased low-density lipoprotein cholesterol (LDLc) levels; and decreased apo-B, high-density lipoprotein cholesterol (HDLc), and apo-A (its concentration is proportional to the degree of glycemic control).16
HTG represents the most common modification, the three mechanisms responsible being decreased LPL activity leading to a decreased conversion of very low density lipoprotein (VLDL) to LDL, the stimulation of the hormone-sensitive lipase that increases free fatty acid flow to the liver which, in turn, stimulates VLDL and apo-B100 production, and cholesterylester transfer protein (CETP) increased action leading to anomalies of VLDL particle composition.17
Postprandial hyperlypidemia, being of both exogenous and endogenous nature, has imbalance as a primary mechanism between excess dietary lipids, on one side, and the increased production of VLDL and chylomicrons, on the other. Increased hepatic production of VLDL that is TG rich and reduced VLDL clearance seem to be key components of the pathophysiology of this dyslipidemia. Small particles of LDLc come from VLDL precursors. Particularly, the reduction of HDLc particles is due to the reduction of bigger HDL2b subspecies, which have antiatherogenic role and to the relative or absolute increase of small, dense HDL3b and HDL3c subspecies, which have reduced cholesterol take-up capacity.15,18
Although lifestyle optimization, which entails a healthy diet and physical exercises, can alleviate atherogenic dyslipidemia characteristic of type 2 diabetes patients, medication is necessary for attaining therapy goals.
Aim of the study
Having these premises, the main objectives of this study were to determine the prevalence of AP in diabetic patients and to underline the importance of HTG as a risk factor in triggering AP.
Also, the link between the occurrence of AP events and the following parameters was studied:
- the quality of glycemic control;
- cardiovascular risk factor components;
- the presence of DM’s chronic complications.
Patients and methods
Study design and patients
In this retrospective cohort-based study, 1,586 patients with DM, 809 males (51%) and 777 females (49%) with a median age of 59 years, admitted to the Internal Medicine Clinic of Diabetes, Nutrition and Metabolic Diseases within the “Pius Brinzeu” Emergency Hospital of Timisoara were enrolled between January and August 2016. The study cohort included patients without a history of AP or CP and meeting the inclusion criteria. The study protocol was approved by the “Pius Brinzeu” Emergency Hospital Timisoara Ethics Committee. All the patients whose data were collected for this study’s purpose provided written informed consent for the acquisition, analysis, and publishing of the anonymized data collected during their hospital admission.
The following parameters have been investigated: age, gender, type and duration of DM, weight (kg), height (cm), body mass index (kg/m2), abdominal circumference (cm), data regarding alcohol consumption and smoking habits, presence of gallstones, and arterial hypertension (AHT). Also, lipidic parameters have been inquired: total cholesterol, TGs, HDLc, and LDLc. The presence of chronic complications related to DM was tested: microvascular diseases (diabetic retinopathy, chronic kidney disease), macrovascular diseases (stroke, ischemic heart disease, diabetic arteriopathy), and neuropathy. The quality of the glycemic control has been evaluated by using glycated hemoglobin (HbA1c), fasting glycemia (mg/dL), and postprandial glycemia (mg/dL).
The AP diagnostic was determined based on the typical clinical symptoms (typical upper abdominal pain, nausea, vomiting, and altered general status), clinical examination, laboratory tests (amylase and lipase), as well as medical imaging.
The antidiabetic treatment that the patients were undergoing was also recorded: dietary regimen, insulin, oral antidiabetics, antidiabetics, and insulin association (Figure 1).
Figure 1 Diagram of the study flow.
Data were presented as mean ± standard deviations for continuous variables with Gaussian distribution, median (interquartile range) for continuous variables without Gaussian distribution, or percentage (absolute frequency) for categorical variables. Continuous variable distributions were tested for normality using the Kolmogorov–Smirnov’s test and for equality of variances by using Levene’s test.
For assessing the significance of the differences between groups, the Student’s t-test (means, Gaussian populations), Mann–Whitney U test (medians, non-Gaussian populations), and Pearson chi-square or Fisher’s exact test (proportions) were used. To evaluate the influence of one or more confounding factors in dichotomous outcomes, univariate and multivariate logistic regression models were derived; the goodness of fit was calculated using Nagelkerke’s R2 method. Linearity of the continuous variables with respect to the logit of the dependent variable was assessed through the Box–Tidwell procedure.
Data were analyzed by using the SPSS v.17 software (SPSS Inc., Chicago, IL, USA) and the R software packages (v.3.3) for statistical computing. A P-value <0.05 was considered as the threshold for statistical significance, and a confidence level of 0.95 was considered for estimating intervals.
The prevalence of pancreatitis in our group of patients was 3.7%. The studied cohort had similar characteristics of the population of patients admitted to our Diabetes clinic; thus it can be concluded that the sample is representative for this population: 51% were males, 92.4% of them had type 2 diabetes mellitus, and they had a median body mass index of 30 kg/m2. The prevalence of diabetes complications and comorbidities was similar to those found in the general diabetic population.
The detailed baseline characteristics of the studied sample are presented in Table 1. The presence of pancreatitis was associated with a higher HbA1c (8.5% vs 7.7%; P<0.001), fasting glycemia (167.5 vs 95 mg/dL; P<0.001), postprandial glycemia (244.5 vs 118 mg/dL; P<0.001), total cholesterol (256.5 vs 189.5 mg/dL; P<0.001), LDLc (208.7 vs 112.8 mg/dL; P<0.001), and TG (495 vs 161 mg/dL; P<0.001).
At the same time, the presence of pancreatitis was associated with a higher prevalence of hypertension (85% vs 73.4%; P=0.042), diabetic polyneuropathy (85% vs 35.2%; P<0.001), and retinopathy (36.7% vs 19.4%; P<0.001). Patients with pancreatitis had a significantly lower HDLc values (35 vs 44 mg/dL; P<0.001) and a higher prevalence of cardiovascular diseases (65% vs 27.9%; P<0.001).
No association between diabetes treatment and the presence of pancreatitis was found. The detailed comparison between patients with versus without pancreatitis can be found in Table 2.
Univariate logistic regressions
In the univariate logistic regression models, the impact of glycemic control on the presence of pancreatitis using the HbA1c values as well as the average values of fasting glycemia and postprandial glycemia was analyzed. An increase in the risk of developing pancreatitis for all the three variables (odds ratio [OR] =1.282; 95% confidence interval [CI], 1.133–1.451; P<0.001), (OR =1.016; 95% CI, 1.012–1.019; P<0.001), and (OR =1.022; 95% CI, 1.018–1.026; P<0.001), respectively, for every 1 percentage point increase in the HbA1c value as well as the fasting glycemia and postprandial glycemia values was noted. In addition, DM-related complications, such as polyneuropathy and retinopathy, were significant risk factors for pancreatitis ([OR =10.436; 95% CI, 5.098–21.363; P<0.001] and [OR =2.406; 95% CI, 1.402–4.129; P<0.001]).
HDLc was found to be a significant protective factor against the risk of pancreatitis (OR =0.936; 95% CI, 0.913–0.96; P<0.001). On the contrary, high LDLc values were a significant risk factor for pancreatitis along with high non-HDLc and high TG values ([OR =1.013; 95% CI, 1.009–1.017; P<0.001] and [OR =1.004; 95% CI, 1.003–1.005; P<0.001]), respectively.
Multivariate logistic regression
A binomial logistic regression was performed to ascertain the effects of independent variables on the likelihood that patients had pancreatitis. A Bonferroni correction was applied using all eight terms in the model resulting in statistical significance being accepted when P<0.0025. Based on this assessment, all continuous independent variables were found to be linearly related to the logit of the dependent variable.
The logistic regression model was statistically significant, χ2(12) =276.925, P<0.0005. The model explained 58.2% (Nagelkerke R2) of the variance in the presence of pancreatitis. Of the 11 predictor variables, only seven were statistically significant: gender, HbA1c value, average fasting glycemia, average postprandial glycemia, TG level, presence of polyneuropathy, and presence of peripheral arteriopathy (Table 3). Males had 8.303 times higher odds of developing pancreatitis than females, OR 95% CI (3.254–21.187). Increasing HbA1c as well as fasting and postprandial glycemia were associated with an increased likelihood of developing pancreatitis, OR 95% CI (1.061–1.626), OR 95% CI (1.002–1.015), and OR 95% CI (1.011–1.023), respectively, but increasing HDLc was associated with a decreased likelihood of exhibiting pancreatitis, OR 95% CI (0.948–1.029) (Figure 2).
Alongside the inherited causes of HTG, the most important predisposing factors are high lipid and carbohydrate intake, lack of physical activity, and obesity.12 The negative impact that the metabolic syndrome (MS), dysglycemia, and abdominal obesity have on the level of TG is very well known.21–23 Insulin resistance and DM both are associated with high levels of TG due to the insulin-dependent inhibition of lipolysis in the adipocyte and with the increased hepatic production of VLDL and TG. Also, the activation of the insulin-dependent lipoprotein lipase (LPL) and the hydrolyzation of lipoprotein-rich TG are affected.15,23
There is a direct correlation between high TG levels and AP, such that mild or moderate increases are considered to be an epiphenomenon, while significant increases of TG (>1,000 mg/dL) can trigger AP.19,20 Similar to cholesterol, TGs are generated from endogenous and exogenous sources. When TGs come from exogenous sources, they are embedded in chylomicrons, while endogenous TGs are synthesized in the liver and embedded in VLDL. Chylomicrons are usually formed 1–3 hours postprandial and are eliminated within 8 hours. Even so, when TG levels are >1,000 mg/dL, chylomicrons are permanently present in the circulation.24 These low-density particles are very large, being capable of obstructing capillaries, leading to local ischemia. These local lesions can expose TG to pancreatic lipase. The degradation of TG to free fatty acids determine cytotoxic lesions, freeing inflammatory mediators and free radicals, leading to AP.25 These two lipoproteins are the most important sources of TG and interact with the LPL in the peripheral tissues, in order to store TG in muscles and adipose tissue. Therefore, the appearance of HTG depends on the balance between the synthesis and catabolism of lipoproteins. Secondary HTG has multiple etiologies, among which the most common are alcohol abuse, DM, poor diet, obesity, estrogens, hypothyroidism, and some drugs (thiazides, betablockers, and protease inhibitors).
The presence of clinical and physical signs that are suggestive for AP has not been very well documented in patients suffering from HTG.6 Median TG values of 51.8 mmol and 50.5 mmol have been reported in patients with AP, but a clear TG limit value above which HTG could be established as a definitive cause of AP has not been identified. Previous studies have underlined an increased incidence of DM in patients with HTG-induced AP: 73% and 43%. AP as a consequence of HTG develops only in the cases in which TG values are >20 mmol (1,772 mg/dL).26
The prevalence of AP was 3.7% among the patients enrolled in the study. AP patients presented an unsatisfactory glycemic control: the median value of HbA1c was 8.5% in those with AP and 7.7% in those without AP (P<0.001). Also, the median values of the fasting and postprandial glycemia were higher in patients who presented AP (P<0.001).
Data collected in this study revealed the fact that increased TG values, especially >500 mg/dL, are accompanied by an increased risk of AP, while increased HDLc is associated with a significant decrease of said risk (P<0.001).
It seems that patients with AP have a significantly higher cardiovascular risk, proven by the association of AP with arterial hypertension and chronic complications of DM, such as diabetic retinopathy, cardiovascular disease, diabetic peripheral artery disease, or diabetic polyneuropathy. The main modifications that incur in the lipid metabolism in diabetic patients are increased TG values, reduced HDL2 fraction and HDL2/HDL3 ratio, the presence of small and dense LDL (phenotype B) particles that are highly atherogenic, increased free fatty acid concentration, increased LP, and prolonged postprandial lipemia.16
The formation of small and dense LDL particles is a consequence of the pathogenic mechanism of chronic HTG which amplifies the exchange of lipidic fractions between VLDL and chylomicrons, on one side, and LDL and HDL, on the other. As a result of this exchange, we have LDL particles that are poor in cholesterol and have excess TG.
Chronic hyperglycemia causes the glycosylation of the ApoB100 within the LDL structure, which induces the glycosylation of the LDL particles, making them more electronegative and more sensitive to oxidation with significant atherogenic implications.16,18
This study demonstrates that besides other complications or comorbidities, like adverse pregnancy outcomes,27 balance impairments,28 or decreased quality of life,29 already proven in Romanian population to be associated with DM, the AP events are having the previously described set of particularities. The importance of the results of the study is emphasized by the fact that, to the authors’ knowledge, this is the first study that analyzes the association between DM and AP incidence in our region. The main limitations of this study are related to its retrospective design, which did not make further collection or dynamic analysis of the cohort possible.
The prevalence of AP was 3.7% among the patients enrolled in the study. HTG represents one of the most important risk factors for AP, especially in diabetic patients. The data of this study have proven a strong correlation between AP and unsatisfactory glycemic control (quantified through HbA1c levels and fasting and postprandial glycemic values), increased TG values, the presence of AHT, as well as the onset and progression of diabetic chronic complications.
Lifestyle optimization by reducing lipid and carbohydrate intake and engaging in physical activities, alongside early and intensive pharmacologic therapeutic strategies, represents the optimal approach in the management of both DM and dyslipidemia (especially HTG), thus preventing the possible occurrence of AP episodes.
The authors report no conflicts of interest in this work.
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