Graphical abstract

INTRODUCTION

Cardiovascular disease (CVD) is the leading cause of death in patients with diabetes mellitus, although cardiovascular complications and death from CVD have recently been decreasing [1]. Dyslipidemia in patients with diabetes is an important treatment target because mortality from CVD is two to four times higher in patients with diabetes than in those without [2,3]. In the UK Prospective Diabetes Study (UKPDS), low-density lipoprotein cholesterol (LDL-C) was the strongest predictor of coronary heart disease in patients with type 2 diabetes mellitus (T2DM) among several risk factors for CVD, and each 39 mg/dL increase in LDL-C increased the coronary heart disease risk by about 60% [4]. Lowering the LDL-C level is the primary target for CVD prevention, but the actual goals differ among various guidelines. In this report, we present the experts’ opinions on lipid management in Koreans with T2DM from a thorough review of previous randomized controlled trials, worldwide guidelines, and Korean data. The Korean Diabetes Association (KDA) and Korean Society of Lipid and Atherosclerosis (KSoLA) have reached a consensus for lipid management in patients with T2DM.

EVIDENCE FOR DYSLIPIDEMIA TREATMENT GOALS

The treatment goal of LDL-C in patients with diabetes was derived from randomized controlled trials on primary and secondary prevention of CVD using drug interventions, meta-analyses, and systematic reviews of those studies [5-10]. The benefits of statin treatment for CVD have been consistently demonstrated in studies of patients with T2DM and subgroup analyses of patients with diabetes in several clinical studies of statins. The Collaborative Atorvastatin Diabetes Study (CARDS) is a representative primary prevention study of statins in patients with T2DM [11]. Atorvastatin (10 mg) was administered to patients with T2DM aged 40 to 75 years with one or more cardiovascular risk factors; the mean LDL-C concentration was 72 mg/dL, which was reduced by 39% compared to baseline, and the risk of major cardiovascular events was reduced by 37% [11]. Representative studies that demonstrated the secondary prevention effect of statin therapy in patients with T2DM with prior CVD are the Treating to New Targets (TNT) [6] and Pravastatin or Atorvastatin Evaluation and Infection Trial (PROVE-IT) [12]. In these studies, when LDL-C concentration was maintained at 57 to 77 mg/dL by administering 80 mg of atorvastatin, the incidence of CVD was significantly reduced compared to the group for which LDL-C concentration was maintained at 81 to 99 mg/dL with atorvastatin 10 mg or pravastatin 40 mg [6,12]. In a meta-analysis of 14 randomized clinical trials, when LDL-C was reduced by 1 mmol/L with statin therapy, there was a 23% reduction in major cardiovascular events over 5 years, regardless of baseline LDL-C concentration or other underlying characteristics, and the benefits of statin treatment were similar between type 1 diabetes mellitus (T1DM) and T2DM [7]. Because patients with T2DM benefited from a relative risk reduction comparable to that of non-diabetic patients in this meta-analysis by the Cholesterol Treatment Trialists’ Collaboration [7], the benefit of absolute reduction in LDL-C by statin therapy can be greater in patients with diabetes, considering the higher absolute risk, than in patients without diabetes. Recent trials evaluating the effects of the combination of statins and ezetimibe or proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors in patients with atherosclerotic CVD, such as the IMProved Reduction of Outcomes: Vytorin Efficacy International Trial (IMPROVE-IT) [13], Further Cardiovascular Outcomes Research with PCSK9 Inhibition in Subjects With Elevated Risk (FOURIER) [14], and the Evaluation of Cardiovascular Outcomes After an Acute Coronary Syndrome During Treatment With Alirocumab (ODYSSEY OUTCOMES) trial [15], showed that even when LDL-C was lowered to less than 70 mg/dL, further reduction of LDL-C lowered the risk of major cardiovascular events.

The IMPROVE-IT study included 18,144 patients who were hospitalized for acute coronary syndrome within 10 days of the study. In the statin and ezetimibe combination treatment group, LDL-C was 15.8 mg/dL lower than that in the statin monotherapy group (53.7 mg/dL vs. 69.5 mg/dL as the median time-weighted average LDL-C level), and the relative risk of CVD significantly decreased by 6.4% at 7 years of follow-up [13]. In the subgroup analysis, the relative risk of CVD was reduced by 14% in patients with diabetes, indicating that the preventive effect of CVD was greater among such patients [16].

In the FOURIER study including 27,564 patients with CVD, the LDL-C levels reduced by 59% (from 92 to 30 mg/dL) in the group in which evolocumab was added to statin. The relative risk of CVD was reduced by 15% over a median of 2.2 years [14]. A subgroup analysis of 11,031 patients with diabetes in this study showed similar results [17]. In the ODYSSEY OUTCOMES trial including 18,924 patients with recent acute coronary syndrome, the risk of CVD was significantly reduced by 15% over a median of 2.8 years in the group in which alirocumab was added to statins, with an LDL-C level of 53.3 mg/dL at 48 months [15]. A subgroup analysis of patients with diabetes showed similar results [18].

RISK STRATIFICATION AMONG PEOPLE WITH DIABETES

Not all patients with diabetes have the same CVD risk. Long duration of diabetes (for T2DM ≥10 years and for T1DM ≥20 years), albuminuria (≥30 mg/g of urine albumin/creatinine ratio), estimated glomerular filtration rate (eGFR) <60 mL/min/1.73 m², retinopathy, neuropathy, and ankle-brachial index <0.9 are well-known risk factors that increase cardiovascular risk in patients with diabetes [19]. In the 2019 European Society of Cardiology (ESC) and European Atherosclerosis Society (EAS) guidelines [20], diabetic patients with (1) target organ damage defined as albuminuria, chronic kidney disease (CKD) with an eGFR of <30 mL/min/1.73 m², retinopathy, or neuropathy; (2) three or more major risk factors including age, hypertension, dyslipidemia, smoking, and obesity; and (3) early onset T1DM with a long duration of >20 years were classified as a very high-risk group with a 10-year cardiovascular mortality risk exceeding 10%. In these patient groups, the LDL-C target is recommended to be a reduction of 50% or more from the baseline and <1.4 mmol/L (<55 mg/dL) [20].

In a 9.3-year follow-up study of 248,000 Korean patients with T2DM aged 30 to 90 years using the Korean National Health Insurance Service (NHIS) database, among diabetic patients without prior CVD, the incidence of myocardial infarction and stroke was increased when accompanied by CKD (eGFR <60 mL/min/1.73 m²), hypertension, long duration of diabetes, and three or more cardiovascular risk factors [21]. In particular, the incidence rate of CVD was similar to or higher in patients with three or more major risk factors (14.1/1,000-person years) or CKD (18.3/1,000-person years) than in patients with prior CVD (14.1/1,000-person years) [21].

CURRENT STATUS OF LIPID MANAGEMENT IN KOREAN PATIENTS WITH T2DM

According to the Diabetes Fact Sheet 2021 of the KDA, 76.5% of Korean adults with diabetes had hyper-LDL-cholesterolemia, and only 38.3% of adults achieved the target level of LDL-C (<100 mg/dL) [22]. In a recent retrospective observational study using electronic medical record data of 2,000 T2DM patients at 15 hospitals, LDL-C goal achievement remained suboptimal according to several current guidelines for dyslipidemia management [23]: 34.9% to 55.2% in very high-risk patients according to the KDA guidelines [24], 15.7% to 26.6% according to the ESC and EAS guidelines [20], and only 15.5% according to the American Diabetes Association guidelines [25]. In a study using the Korean NHIS database including approximately 153,000 patients with diabetes, LDL-C goal attainment rates were 32.6% in patients without a high risk of CVD (<100 mg/dL) and 12.2% in patients with a high risk of CVD (<70 mg/dL) [26]. When assessing the gap between real-world practice and clinical guidelines, investigators’ assessment of risk was underestimated by 71.6% compared to that by clinical guidelines [27]. Physicians’ perceptions of the target achievement rate of LDL-C were higher than the actual achievement rate (70.6% vs. 47.4%) [28], and physician satisfaction with patients’ LDL-C levels was the primary reason for the non-intensification of statin therapy [27].

TREATMENT GOAL

The primary treatment goal for dyslipidemia in diabetic patients is the control of LDL-C. Non-high-density lipoprotein cholesterol (HDL-C) or apolipoprotein B can be used as a target when LDL-C has reached the target level but hypertriglyceridemia persists, or when the blood sample is drawn in a non-fasting state [29]. The target goal of non-HDL-C is to add 30 mg/dL to the existing target LDL-C level (Table 1).

Low-density lipoprotein cholesterol

Among people with diabetes, cardiovascular risk varies according to comorbidities and accompanying cardiovascular risk factors. Therefore, it is important to identify the patient’s comorbidities, including CVD and target organ damage (albuminuria, CKD [eGFR <60 mL/min/1.73 m²], retinopathy, neuropathy, and left ventricular hypertrophy), major cardiovascular risk factors (age, family history of premature atherosclerotic CVD, hypertension, smoking, and low HDL-C), and duration of diabetes to determine the LDL-C treatment goal for each patient with T2DM.

Table 1 shows the LDL-C treatment goals according to cardiovascular risk. In patients with T2DM and CVD, an LDL-C goal of <55 mg/dL and a reduction in LDL-C level by 50% or more from the baseline is recommended. For the primary prevention of CVD in patients with T2DM who have a diabetes duration ≥10 years or who have major cardiovascular risk factors or target organ damage, an LDL-C goal of <70 mg/dL is recommended. In patients with T2DM who have any target organ damage or more than three major cardiovascular risk factors, an LDL-C goal of <55 mg/dL is considered an option. In patients with T2DM who have a diabetes duration <10 years and no major cardiovascular risk factors, an LDL-C target of <100 mg/dL is recommended.

Triglyceride

The risk of acute pancreatitis increases when the triglyceride concentration is elevated to 500 mg/dL or higher; therefore, control is required. Whether hypertriglyceridemia is a risk factor for CVD remains controversial. Triglyceride elevation reflects the number of residual lipoprotein particles, which are factors other than LDL-C that promote atherosclerosis and are associated with an increase in small dense LDL particles. Therefore, the opinion that it is one of the risk factors for CVD prevails [30]. Triglycerides are particularly increased in patients with overweight, obesity, metabolic syndrome, and diabetes. In the 2001 National Cholesterol Education Program-Adult Treatment Panel (NECP-ATP) III report [31,32], 150 mg/dL or more of triglycerides was suggested as a diagnostic criterion for metabolic syndrome and the normal range of triglycerides is <150 mg/dL. Therefore, this criterion is recommended as a control mark for triglycerides and substituted by non-HDL-C level as a target.

High-density lipoprotein cholesterol

Based on the study that an increase in HDL-C concentration decreased mortality by CVD [33], low HDL-C (less than 40 mg/dL) was defined as a risk factor for CVD and a diagnostic element of metabolic syndrome in the 2001 NECP-ATP III guidelines [31]. Although the upper limit of the treatment target for HDL-C is not specified, it is recommended to pay attention to low HDL-C as a cardiovascular risk factor and maintain a concentration of >40 mg/dL in men and >50 mg/dL in women.

TREATMENTS

Lifestyle intervention

In a randomized controlled trial of the effects of a Mediterranean-style diet on cardiovascular risk in people with T2DM or cardiovascular risk factors, the risk of CVD was reduced by 31% compared to the control group [34]. Medical nutrition therapy and lifestyle modifications, including increased physical activity and weight loss in patients with obesity, can improve lipid concentrations [35]. Medical nutrition therapy should be individualized in consideration of the patient’s age, type of diabetes, medications, lipid profile, and comorbidities. Patients should be encouraged to reduce their intake of saturated fat, cholesterol, and trans-fat and increase their intake of omega-3 fatty acids and dietary fiber. Optimizing glycemic control can improve lipid profiles, especially in patients with diabetes who have poor glycemic control and high triglyceride levels. In addition, abstinence from alcohol and weight loss are effective in treating hypertriglyceridemia.

Pharmacological treatments

LDL-C lowering therapy

1) Statins

Statins are the first-line treatment for patients with diabetes and dyslipidemia. If the LDL-C target goal is not achieved with the usual statin dose, the dose should be increased to the maximum tolerated dose or replaced with high-intensity statins [36,37]. In a study of patients with diabetes, statin treatment showed significant efficacy in both primary and secondary prevention of CVD in previously described studies, such as the CADS, TNT, and PROVE-IT studies.

2) Combination of statins and ezetimibe/PCSK9 inhibitor

Compared to statin monotherapy, ezetimibe combined with statins can lower LDL-C concentrations by an additional 15% to 20% [38,39]. IMPROVE-IT is a representative study that showed the effect of statin and ezetimibe combination treatment in reducing the incidence of CVD. The PCSK9 inhibitors evolocumab and alirocumab were added for patients with a high risk of CVD or T2DM who were using statins at the maximum tolerated dose; LDL-C concentration was further reduced by 36% to 59% [40-42]. In a systematic review and meta-analysis of 39 randomized controlled trials, including a total of 66,478 patients, the PCSK9 inhibitor group showed no difference in overall mortality compared to the control group, but the risk of myocardial infarction, stroke, and coronary revascularization was significantly low [43]. Therefore, the addition of ezetimibe or PCSK9 inhibitors should be considered in patients with diabetes and CVD if the target LDL-C goal is not met by the maximum tolerable dose of statins.

3) Combination of statins and omega-3 fatty acid

There have been studies on statin and omega-3 fatty acid combination therapy, but this combination therapy has not shown any clear benefit. The results of studies on the prevention of CVD by omega-3 fatty acids are inconsistent. In the Reduction of Cardiovascular Events with Icosapent Ethyl-Intervention Trial (REDUCE-IT) study, a combination treatment with statins and 4 g icosapent ethyl, which is a highly purified and stable eicosapentaenoic acid (EPA), showed a preventive effect against CVD [44]. The same effect was found in a subgroup analysis of patients with diabetes. However, in the Outcomes Study to Assess Statin Residual Risk Reduction with Epanova in High Cardiovascular Risk Patients with Hypertriglyceridemia (STRENGTH) study, which included 70% diabetic patients, the combination treatment of statins and 4 g omega-3 acids EPA and docosahexaenoic acid (DHA) per day did not show any significant difference in the composite outcome of major CVD compared to that with corn oil [45].

4) Combination of statins and fibrates

Whether the combination of statins and fibrates helps lower CVD events in patients with T2DM is controversial. In the Action to Control Cardiovascular Risk in Diabetes (ACCORD) lipid study, the combination of statins and fibrates failed to lower the risk of CVD when compared to statin monotherapy [46]. However, in the subgroup analysis, a possible CVD preventive benefit was observed in patients with both a high baseline triglyceride and a low baseline HDL-C level, which is typical of diabetic dyslipidemia [46]. A similar result was shown in the Fenofibrate Intervention and Event Lowering in Diabetes (FIELD) study [47,48]; therefore, there was an effort to estimate the expected treatment effect of fenofibrate in patients with T2DM and dyslipidemia [49]. In a recent propensity-matched cohort study in Korea, the risk of major cardiovascular events was reduced in adults with metabolic syndrome using fenofibrate as an add-on to statin treatment and also in diabetic patients in a subgroup analysis [50]. However, in the most recently published the Pemafibrate to Reduce Cardiovascular Outcomes by Reducing Triglycerides in Patients with Diabetes (PROMINENT) trial, pemafibrate treatment did not reduce the risk of CVD in patients with T2DM and dyslipidemia, in whom 95.7% of the study population were already receiving statins, even though it significantly reduced triglyceride, very-low-density lipoprotein cholesterol, measured remnant cholesterol, and apolipoprotein C-III levels [51]. This suggests that triglyceride-lowering treatment using fibrates has limitations in reducing the risk of residual CVD.

Treatment for hypertriglyceridemia

In the case of hypertriglyceridemia, it is necessary to determine if there are secondary causes that may increase triglyceride levels (weight gain, drinking, excessive carbohydrate intake, CKD, diabetes, hypothyroidism, pregnancy, and use of estrogen, tamoxifen, and glucocorticoids) and any genetic factors that may cause abnormalities in lipid metabolism [52]. Lifestyle modifications such as weight loss, increased physical activity, and medical nutrition therapy, including abstinence from alcohol, are effective in the treatment of hypertriglyceridemia in diabetic patients and may reduce the risk factors for atherosclerotic CVD in some patients [53]. If hyperglycemia is not controlled, hypertriglyceridemia is exacerbated, and strict glycemic control can lower triglyceride levels. If there is a secondary cause, treatment for it is prioritized.

In cases of severe hypertriglyceridemia with a triglyceride concentration ≥500 mg/dL, a low-fat diet, abstinence from alcohol, and immediate drug treatment such as omega-3 fatty acids or fibrate to prevent acute pancreatitis is considered [54]. If the triglyceride concentration is 200 to 499 mg/dL, the primary treatment goal is to lower LDL-C to less than the targeted level, according to the cardiovascular risk. If triglycerides persist at >200 mg/dL even after achieving the LDL-C target goal through therapeutic lifestyle adjustment and statin treatment, drug treatments such as fibrate and omega-3 fatty acids can be considered to lower the triglycerides. Combination therapy can be considered when triglyceride levels do not reach the target even after administration of a single drug for triglyceride control.

CURRENT LIMITATIONS AND RESEARCH NEEDS

Efforts have been made to suggest appropriate lipid management targets for Koreans using retrospective data [21,55-58]. However, there is a lack of independent studies to establish lipid management goals in Korean with diabetes or to evaluate whether achieving the treatment goals based on evidence from other ethnic groups is effective in preventing CVD in Korean patients with diabetes. Therefore, well-designed randomized clinical trials targeting Koreans are needed in the future to strengthen the evidence of this statement.

CONSENSUS STATEMENT

1. The primary treatment goal for dyslipidemia in patients with diabetes is to control their LDL-C levels.

2. To determine the LDL-C treatment goal for each patient with T2DM, the patient’s comorbidities, including CVD and target organ damage (albuminuria, CKD, retinopathy, neuropathy, and left ventricular hypertrophy), major cardiovascular risk factors (age, family history of premature atherosclerotic CVD, hypertension, smoking, and low HDL-C), and duration of diabetes must be identified first.

3. In patients with T2DM and CVD, an LDL-C goal of <55 mg/dL and a reduction in LDL-C level by 50% or more from the baseline is recommended.

4. For the primary prevention of CVD in patients with T2DM who have a duration of diabetes ≥10 years or who have major cardiovascular risk factors or target organ damage, an LDL-C goal of <70 mg/dL is recommended.

5. For the primary prevention of CVD in patients with T2DM who have any target organ damage or more than three major cardiovascular risk factors, an LDL-C goal of <55 mg/dL is considered an option.

6. For the primary prevention of CVD in patients with T2DM who have a duration of diabetes <10 years and no major cardiovascular risk factors, an LDL-C goal of <100 mg/dL is recommended.

7. Statin is the first-line treatment for patients with diabetes and dyslipidemia.

8. The addition of ezetimibe or PCSK9 inhibitors should be considered for patients with diabetes and CVD if the target LDL-C goal is not met by a maximum tolerable dose of statin.

NOTES

CONFLICTS OF INTEREST

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

FUNDING

None

Acknowledgements

This work was performed with the cooperation of the Korean Diabetes Association and Korean Society of Lipid and Atherosclerosis.

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About this article

Yang YS, Kim HL, Kim SH, Moon MK; on Behalf of Committee of Clinical Practice Guideline; Korean Diabetes Association and Clinical Practice Guideline Committee; Korean Society of Lipid and Atherosclerosis. Lipid Management in Korean People with Type 2 Diabetes Mellitus: Korean Diabetes Association and Korean Society of Lipid and Atherosclerosis Consensus Statement. Diabetes Metab J. 2023;47(1):1-9.

Received: Dec 23, 2022; Accepted: Jan 12, 2023

DOI: https://doi.org/10.4093/dmj.2022.0448.

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