Original article| Open access | J Adv Biotechnol Exp Ther. 2022; 5(1): 247-256.|doi: 10.5455/jabet.2022.d112

Prevalence of hyperlipidemia in controlled and uncontrolled type-2 diabetic patients


Patients with type-2 diabetes mellitus (T2DM) are known to suffer from hyperlipidemia. How hyperlipidemia is associated with controlled and uncontrolled T2DM patients in Bangladesh remained to be addressed. In this cross-sectional study, 211 participants were enrolled who have been suffering from T2DM for more than 4 years from the northeastern part of Bangladesh. Controlled and uncontrolled patients were defined with their plasma glycated hemoglobin (HbA1c) levels.  Among them, 39% and 61% were in the diabetic-controlled and uncontrolled groups. Indeed, the diabetic uncontrolled group showed a higher frequency of hypercholesterolemia, hypertriglyceridemia, hyper LDL-cholesterolemia, and hypo HDL-cholesterolemia compare to the diabetic controlled group. Lipid profiling analysis revealed significantly elevated (p<0.0001) levels of cholesterol, triglyceride, and low-density lipoprotein (LDL) in uncontrolled than the controlled group, while high-density lipoprotein (HDL) was significantly (p<0.0001) lower in uncontrolled diabetics patients. Interestingly, significantly (p<0.05) higher dyslipidemia was also observed in individuals with controlled diabetic population, who have been suffering from T2DM for more than 7 years. Therefore, these results highlight that not only the diabetic uncontrolled but also the controlled group patients have a high risk of developing hyperlipidemia after a certain period of diabetes.


The Lipids, more specifically cholesterol (CHO), triglycerides (TG), phospholipids, lipoproteins are considered essential to the human body by making up the fundamental structure of the cell membrane as a building block and by acting as a precursor to vitamin D, steroid hormones, and bile salts as well as by participating in cell signaling and energy-storing [1-5]. In many unusual physical conditions including diabetes mellitus (DM), the concentration of lipids in human blood has not remained at a normal level which is known as dyslipidemia [6], although the term, hyperlipidemia is a condition that describes only the elevation of lipids such as CHO, TG, lipoproteins, chylomicrons, and LDL within the human body compared to the normal levels [7-9]. Hyperlipidemia is one of the most prevalent non-communicable diseases all over the globe including Bangladesh [10-12].
Hyperlipidemia plays a pivotal role in blood LDL and HDL imbalance which is associated with increased risk of cardiovascular complications [13-17]. Several factors, including diets rich in saturated fats, lower physical activity, obesity, and a few physiological disorders like chronic kidney diseases, biliary obstruction, hypertension, DM, and even pre-diabetic conditions also associated with the increase of hyperlipidemia [18, 19]. Hyperlipidemia is a very common incidence in people with T2DM and prediabetes [20, 21], but the pattern of the different lipid profiles may vary among the ethnic groups, socio-economic levels, and accessibility to the health care system [22, 23].
Various scientific studies have been conducted to establish the prevalence of hyperlipidemia in T2DM patients compared with non-diabetic individuals in various parts of the world. Recent studies in China showed that hyperlipidemia was tremendously common in T2DM patients [24, 25], characterized by increased TG and LDL as well as decreased HDL, and having a high risk of coronary heart diseases [26] when compared to non-diabetic patients. Another Indian research group disclosed that uncontrolled diabetic patients were at high threat of hyperlipidemia and proper glycemic control could prevent it in T2DM patients as well as hinder atherosclerosis and neurological risk [27]. An abnormal lipid profile parameter in T2DM patients is a major risk factor for coronary vascular diseases, which is a combination of T2DM and systemic hypertension [28, 29], revealed by the other two research groups of India and Oman.
However, there were very few studies focused on the prevalence of hyperlipidemia in controlled and uncontrolled diabetic patients. To the best of our knowledge, such type of cross-sectional study has never been conducted in Bangladesh. Therefore, this study aimed to find out the frequency of lipid profile (CHO, TG, HDL, and LDL) in diabetic controlled and uncontrolled groups and analyze the comparative prevalence of hyperlipidemia between the two groups.


Study population
A total of 211 clinically diagnosed diabetic samples were used to complete this study. The specimens were collected from both male and female patients of more than twenty years old as well as suffered from T2DM for a prolonged period (more than 4 years). Primarily, diabetic patients were categorized into the controlled and uncontrolled groups based on the last 3 years of glycated hemoglobin (HbA1c) history, and that information was collected from the patient’s health record books. HbA1c levels of >6.5% were considered as uncontrolled diabetes group while <6.5% as controlled group [30, 31].


Study place, time, and approval
The study was carried out in the Department of Biochemistry and Molecular Biology of Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh, from July 2019 to August 2021. Few technical supports were taken from a well-known diagnostic center named Medinova Medical Services Ltd. Sylhet, Bangladesh. This study was approved by the Departmental Ethical Committee of the Department of Biochemistry and Molecular Biology of Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh (reference no.: 01/BMB/2019). All the participants of diabetic patients were given a consent form for their approval and after getting their informed consent; a standard questionnaire set was circulated among the study participants to answer. Sociodemographic data were collected by trained medical staff following standardized protocol [32-34] on a structured questionnaire, which contained the responder’s name, ID, address, age, sex, body weight and height, duration of diabetes, type of diabetes, family history, occupation, physical activities, current health status, etc. (attached questionnaire as supplemental file).


Specimen collection and preparation
The specimen was collected from several hospitals and diagnostic centers named MAG Osmani Medical College and Hospital, Diabetic Hospital Sylhet, and Medinova Medical Services Ltd. of a north-eastern city named Sylhet in Bangladesh. The relevant specimen like 3ml of venous blood was collected after overnight fasting from each participant under strict aseptic precautions in different two vacutainer blood collection tubes for desired blood parameters estimation. Both the purple-top tube and red-top tube (serum separator tube) [35-37] was used to collect the whole blood. The whole blood from the purple-top tube was used to estimate the HbA1c level of blood to define the controlled and uncontrolled diabetic patient. Another red-top tube blood was used to separate serum by centrifuging at 4000 rpm and 37℃ for 20 minutes and was used to estimate the levels of CHO, TG, LDL, and HDL.


Biochemical assays
HbA1c estimation: Controlled and uncontrolled diabetic patients were identified through estimating their HbA1c levels from whole blood with an automatic chemistry analyzer (Dimension RxL Max Integrated Chemistry System, SIEMENS, USA) using dimension flex hemoglobin A1c reagent kit (Siemens Healthcare Diagnostics Inc., USA).
Lipid profile estimation: Lipid profile i.e., total CHO, TG, LDL, and HDL were estimated by colorimetric methods using commercially available kits such as Cholesterol liquicolor, Triglycerides liquicolormoto, LDL cholesterol liquicolor, and LDL cholesterol liquicolor (Human Diagnostic, Germany) respectively [32]. All lipid profile measurements were done according to the manufacturer’s protocols (Human Diagnostic, Germany) with a semi-auto biochemistry analyzer (Humalyzer 3000, USA). The accuracy of all the analyses was confirmed through standard calibration regularly.


Statistical analysis
For the statistical analysis, all the data obtained by biochemical assays were added in Microsoft Office Excel 2007. The average and standard deviation were calculated. To define the controlled and uncontrolled diabetic patients, the association of lipid profile in both the controlled and uncontrolled groups and in diabetes duration-based populations, the mean of the variables and student t-test (two-tailed) were used. A p-value of <0.05 was considered statistically significant, otherwise not significant (NS).


Diabetes and HbA1c
In this study, a total of 211 participants were included with their consent, who had been suffering from type-2 diabetes for more than four years. Among the participants, 56% and 44% were male and female, respectively (Table 1). Based on the standard level of HbA1c, the controlled (<6.5%) and uncontrolled (≥6.5%) diabetic patient groups were defined which were 39% and 61% respectively (Table 1). Interestingly, the level of HbA1c was significantly (p<0.0001) higher in uncontrolled diabetic patients than that of the controlled group [Figure 1(A)]. We categorized all the diabetic patients into several age groups wherein 51-60 years old individuals showed more susceptibility to diabetes mellitus [Figure 1(B)].

Prevalence of hyperlipidemia in controlled and uncontrolled type-2 diabetic patients
Figure 1. (A) The score of HbA1c between controlled and uncontrolled diabetic patients, which is significant using student t-test, p<0.0001. (B) Appearance of diabetes mellitus in several age groups.

Table 1. Control, uncontrolled, and sex-based sample distribution.


Hyperlipidemia associated diabetes
High TG and low HDL levels were observed in patients with type -2 diabetes. The frequency of hypercholesterolemia, hypertriglyceridemia, hyper LDL-cholesterolemia, and hypo HDL-cholesterolemia were 17.80%, 37.70%, 26.20%, and 41.70% respectively, in the diabetes-controlled group (Figure 2). In contrary, the frequencies of the mentioned earlier parameters were quite high in the uncontrolled group representing 82.60%, 94.50%, 83.50%, and 94.50% respectively (Figure 2). T2DM patients generally tend to develop hyperlipidemia and vice-versa. In our study, we have seen a significant (p <0.0001) elevation of serum CHO, TG, and LDL in the diabetic uncontrolled patient group in comparison with the controlled group. Moreover, the uncontrolled group showed significantly (p <0.0001) lower HDL than the controlled group. These results suggest that uncontrolled diabetic patients are at high risk of hyperlipidemia than controlled ones (Figure 3).

Prevalence of hyperlipidemia in controlled and uncontrolled type-2 diabetic patients
Figure 2. Amplitude of dyslipidemia in diabetic patients.
Prevalence of hyperlipidemia in controlled and uncontrolled type-2 diabetic patients
Figure 3. Lipid profile analysis of both controlled and uncontrolled diabetic patients. (A), (B), (C), cholesterol, triglyceride, and LDL levels in uncontrolled diabetic patients were significantly (p <0.0001) higher than in the controlled group. (D) HDL level was significantly (p <0.0001) lower in the uncontrolled group than in the controlled one.


Duration-based exploration of lipid profile
We also studied the status of lipid profiles in controlled diabetic patients depending on the onset of the duration of their diabetes. Significantly, (p <0.05) higher CHO and TG were noticed after 7 years of diabetes onset [Figure 4(A), 4(B)] but remarkably elevated LDL was detected after 8 years of diabetes mellitus [Figure 4(C)]. In the case of HDL, significantly lower (p <0.05) levels were observed in the controlled group after 7 years of diabetes mellitus [Figure 4(D]).

Prevalence of hyperlipidemia in controlled and uncontrolled type-2 diabetic patients
Figure 4. Study of lipid profile in the diabetic controlled group with onset of T2DM duration (year) manner. (A), (B), significantly elevated cholesterol and triglyceride were found in the diabetic controlled group after 7 (p<0.05) and 8 (p<0.01) years but not before 6 and 7 years of T2DM onset. (C), significantly (p<0.05) increased LDL was found after 8 years but not earlier. (D), Significantly lower HDL was found after 7 (p<0.05) and 8 (p<0.01) years but not prior to 6 and 7 years of T2DM onset.


The present study was conducted to assess the frequency of dyslipidemia in diabetic controlled and uncontrolled groups so that both types of patients would be more aware to lead a healthier lifestyle as well as to control their DM. To the best of our knowledge, this is the first study that reports the prevalence of hyperlipidemia in controlled and uncontrolled diabetic patients in the Bangladeshi population.
This study found that about 61% of the diabetic patients had bad glycemic control which was considered as a diabetic uncontrolled group and the remaining 39% were having good glycemic control and were considered as a diabetic controlled group [30]. An age group of 51-60 years was detected as more susceptible to T2DM. One of the studies conducted in India found 64.5% of diabetic uncontrolled patients from the total population of that study based on standard levels of HbA1c and the majority (41.8%) of diabetic patients of the study population were belonging to the 51-60 age group category [38]. Another two research groups from USA and India reported that T2DM usually appears in middle-aged people (40-60 years) and our results are in line with them [38, 39].
This cross-sectional study revealed an alarming scenario of the high number of patients with hypercholesterolemia (82.60%), hypertriglyceridemia (94.50%), hyper LDL-cholesterolemia (83.50%), and hypo HDL-cholesterolemia (94.50%) based on the standard serum levels of CHO (150-200 mg/dl), TG (50-150 mg/dl), LDL (<130 mg/dl), and HDL (>35 mg/dl) [40, 41] in type-2 diabetic uncontrolled group which were almost 4.5, 2.5, 3, and 2 times higher compared with the controlled group. As in the current studies, high prevalence of cholesterol (up to 72%), triglyceride (up to 70%), and LDL (48%), and lower HDL (up to 37%) have been reported for the South Asian population [42-45] where CHO, TG, and LDL levels in the diabetic uncontrolled group were almost 1.1, 1.3, and 1.7 times higher respectively which are slightly lower than this study.
This cross-sectional study observed significantly (p<0.0001) elevated CHO, TG, and LDL levels in the diabetic uncontrolled group than in the controlled group. Besides, a significantly (p<0.0001) lower level of HDL was also detected in the uncontrolled group compared to the diabetic controlled one. A few of scientific studies from USA, UK, China, and India have reported that they observed higher CHO, TG, and LDL, as well as lower HDL levels in type-2 diabetic patients [42, 46-49], compared to the non-diabetic individuals and the results of this study are in line with them. According to a Sudanese study, overproduction of LDL leads to increase plasma TG and decrease HDL levels in T2DM patients [50] which is analogous to our findings. The pattern of lipid profiles in the uncontrolled and controlled groups of this study is similar to other studies performed in Iraq [51, 52].
Any disorder in carbohydrate metabolism leads to a disorder in lipid metabolism, so high concentration of plasma CHO, TG and decline in plasma HDL levels lead to insulin resistance with or without DM which is intently related to a qualitative change in the lipid profile pattern [53], i.e., plasma lipid profile and hyperglycemia are interrelated which also harmonious to our lipid profiling observations.
The status of lipid profile in controlled diabetic subjects based on the duration of onset of their T2DM was also explored. The controlled group was significantly (p<0.05) susceptible to hypercholesterolemia, hypertriglyceridemia, and hypo HDL-cholesterolemia after 7 years of DM onset. On the other hand, hyper LDL-cholesterolemia was significantly (p<0.05) observed in the controlled group after 8 years of DM. A significant positive correlation between lipid profile (CHO, TG, LDL, and HDL) and duration of diabetes was shown in an Indian scientific study [42], and in this study, we also found significantly (p<0.05) high lipid profile in diabetic controlled group after 7 years of diabetes onset. Recently, a Chinese scientific study revealed that a longer duration of DM was associated with a high risk of cardiovascular diseases by emerging plasma lipid profile [54], although according to another Nigerian study [55], lipid profile pattern did not skew to the duration of diabetes. Throughout the study, we did not consider the food habits of T2DM patients, which is maybe a limitation of this study to analyze the lipid profiles of both the controlled and uncontrolled groups perfectly.


A significantly higher prevalence of hyperlipidemia was observed in the uncontrolled diabetic population as well as in the controlled group after 7 to 8 years of diabetes onset which is an alarming risk of cardiovascular diseases and other lipid-related complications. Overall, hyperlipidemia is closely associated with a lack of proper management of T2DM and also with the long duration of diabetes. So, not only glycemic control but also the duration of DM should be considered by clinicians to assess hyperlipidemia-related complications. Further research should be carried out using several provable parameters including food habits that may involve with hyperlipidemia in controlled and uncontrolled type-2 diabetic patients.


We acknowledge and thank the SUST research center for funding (grant number LS/2019/01/01) and also thanks to the Department of Biochemistry and Molecular Biology, Shahjalal University of Science and Technology, Sylhet-3114, and to Medinova Medical Services Ltd. Sylhet, Bangladesh for technical support. We are also grateful to MAG Osmani Medical College and Hospital and Diabetic Hospital Sylhet, Bangladesh, for allowing us to collect samples. Finally, we express our deepest sense of gratitude to all participants for their endeavor in this study.


MAH was involved in the conception and design of the experiments. MAH, FRN, AIA, MH, SSP, and PCD contributed to perform the experiments. MAH and MWM analyzed data. MAH contributed to drafting the article. MAH and ZH contributed to revising it critically for important intellectual content. MAH and ZH made the final approval of the version to be published. All authors have read and agreed to the published version of the manuscript.


There is no conflict of interest among the authors.


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Article Info

Academic Editor

Md Jamal Uddin, PhD; Ewha Womans University, Seoul, South Korea
17 October, 2021
30 December, 2021
17 January, 2022

Coresponding author

Mohammad Abul Hasnat, Department of Biochemistry and Molecular Biology, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh, e-mail: hasnat-bmb@sust.edu
Zafrul Hasan, Department of Biochemistry and Molecular Biology, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh, e-mail: zafrul-bmb@sust.edu

Cite this article

Hasnat MA, Niloy FR, Ashik AI, et al. Prevalence of hyperlipidemia in controlled and uncontrolled type-2 diabetic patients. J Adv Biotechnol Exp Ther. 2022; 5(1): 247-256.