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Review
Clinical Care/Education 2019 Clinical Practice Guidelines for Type 2 Diabetes Mellitus in Korea
Mee Kyoung Kim1orcid, Seung-Hyun Ko2, Bo-Yeon Kim3, Eun Seok Kang4, Junghyun Noh5, Soo-Kyung Kim6, Seok-O Park7, Kyu Yeon Hur8, Suk Chon9, Min Kyong Moon10, Nan-Hee Kim11, Sang Yong Kim12, Sang Youl Rhee9, Kang-Woo Lee13, Jae Hyeon Kim8, Eun-Jung Rhee14, SungWan Chun15, Sung Hoon Yu16, Dae Jung Kim17, Hyuk-Sang Kwon1orcid, Kyong Soo Park18,19, Committee of Clinical Practice Guidelines, Korean Diabetes Association
Diabetes & Metabolism Journal 2019;43(4):398-406.
DOI: https://doi.org/10.4093/dmj.2019.0137
Published online: August 20, 2019
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1Division of Endocrinology and Metabolism, Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.

2Division of Endocrinology and Metabolism, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.

3Division of Endocrinology and Metabolism, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.

4Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.

5Division of Endocrinology and Metabolism, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.

6Division of Endocrinology and Metabolism, Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Korea.

7Gwangmyeong Sungae Hospital, Gwangmyeong, Korea.

8Division of Endocrinology and Metabolism, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

9Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Korea.

10Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.

11Department of Internal Medicine, Korea University College of Medicine, Ansan, Korea.

12Division of Endocrinology and Metabolism, Department of Internal Medicine, Chosun University College of Medicine, Gwangju, Korea.

13Sejong St. Mary's Diabetes and Endocrine Clinic, Sejong, Korea.

14Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.

15Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Korea.

16Department of Endocrinology and Metabolism, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea.

17Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.

18Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea.

19Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.

corresp_icon Corresponding author: Hyuk-Sang Kwon. Division of Endocrinology and Metabolism, Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 10 63-ro, Yeongdeungpo-gu, Seoul 07345, Korea. drkwon@catholic.ac.kr
• Received: July 16, 2019   • Accepted: July 22, 2019

Copyright © 2019 Korean Diabetes Association

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • The Committee of Clinical Practice Guidelines of the Korean Diabetes Association revised and updated the 6th Clinical Practice Guidelines in 2019. Targets of glycemic, blood pressure, and lipid control in type 2 diabetes mellitus (T2DM) were updated. The obese and overweight population is increasing steadily in Korea, and half of the Koreans with diabetes are obese. Evidence-based recommendations for weight-loss therapy for obesity management as treatment for hyperglycemia in T2DM were provided. In addition, evidence from large clinical studies assessing cardiovascular outcomes following the use of sodium-glucose cotransporter-2 inhibitors and glucagon-like peptide 1 receptor agonists in patients with T2DM were incorporated into the recommendations.
The prevalence of type 2 diabetes mellitus (T2DM) in Korea is estimated to be 14.4% (in those over 30 years of age), according to a report by the Korean National Health and Nutrition Examination Survey 2011 to 2016 [1]. The prevalence of diabetes mellitus (DM) increased in both men and women as age increased and the prevalence of DM exceeded 10% for men in their 40s and 10% for women in their 50s. The obese and overweight population is also increasing steadily in Korea. Half of the people with DM are obese; class II obesity (body mass index [BMI] 30.0 to 34.9) is 8.4% and class III obesity (BMI ≥35.0) is 1.8% in people with DM [1]. Thus the early detection and prevention of T2DM are major health concerns for Koreans and the government. The diagnosis and appropriate treatment for T2DM are very important issues in establishing and implementing high-priority health policies in Korea.
The diagnostic criteria for T2DM are based on the plasma glucose, either the fasting plasma glucose (FPG) or the 2-hour plasma glucose during a 75-g oral glucose tolerance test (OGTT), or glycated hemoglobin (HbA1c) value (Table 1). The HbA1c test should be performed using a method that is certified by the National Glycohemoglobin Standardization Program (NGSP) and standardized or traceable to the Diabetes Control and Complications Trial (DCCT) reference assay [2]. In Korea, HbA1c standardization has been widely performed since 2007 [3], and since 2011, HbA1c has been included as a diagnostic criterion for the Korean Diabetes Association clinical practice guidelines [3]. Unless there is a clear diagnosis (classic symptoms of DM with a random plasma glucose 200 mg/dL), diagnosis requires two abnormal test results from the same sample or in two separate samples. If two different tests (HbA1c and FPG) are both above the diagnostic criteria when analyzed from the same sample or same day, this confirms the diagnosis of DM. According to the study of 4,481 Korean people with HbA1c and FPG, but with no diabetic medications in the Korean National and Nutritional Examination Survey, the HbA1c levels corresponding to the FPG of 100 and 126 mg/dL were 5.75% and 6.42%, respectively [4]. Therefore, the suitable cutoff value of HbA1c for the diagnosis of DM in the Korean population is 6.5%, as suggested by the American Diabetes Association (ADA). When 4,610 individuals with data from a 75-g OGTT and no previous history of DM were analyzed, individuals with impaired fasting glucose were classified into FPG 100 to 109 mg/dL and 110 to 125 mg/dL levels [5]. More individuals with FPG 110 to 125 mg/dL were diagnosed with DM as determined by a 2-hour plasma glucose result ≥200 mg/dL [5]. Therefore, to detect more cases of DM, the 75-g OGTT is recommended for all individuals with FPG 110 to 125 mg/dL.
In the Kumamoto study [6] and the UK Prospective Diabetes Study (UKPDS) study [7], intensive glycemic control proved to be effective in preventing microvascular complications, and long-term follow-up of UKPDS cohorts [7] showed enduring effects of early glycemic control on microvascular complications. In the Kumamoto study [6], the goal of the intensive glucose control group was to maintain the blood glucose control as close as possible to FPG <140 mg/dL, 2-hour post-prandial blood glucose <200 mg/dL, and HbA1c <7%. The actual HbA1c level achieved was 7.1%. During the 6-year study period, retinopathy decreased by 69%, nephropathy decreased by 70%, and nerve conduction velocity improved in the intensive glycemic control group [6]. The researchers suggested that the glycemic threshold to prevent the onset and progression of microvascular complications was indicated as follows: HbA1c <6.5%, FPG <110 mg/dL, and 2-hour post-prandial blood glucose <180 mg/dL [6]. Many meta-analyses consistently provided evidence for the clinical benefits of achieving and maintaining intensive glycemic control to prevent diabetic complications. Therefore, optimal HbA1c target for patients with T2DM is recommended to be <6.5% (Table 2), especially in the recently diagnosed, young patients with T2DM without severe complications or hypoglycemia, through lifestyle modification (LSM) and glucose-lowering agents, including insulin. However, the glycemic target should be individualized based on patient characteristics and preference. In patients with a history of severe hypoglycemia or advanced diabetic complications, short life expectancy, or advanced age, the glycemic target must be individualized with consideration of risks of complications such as hypoglycemia. The recommended glycemic target for type 1 DM is an HbA1c concentration of <7.0%.
The ADA recommends that the intensity of statin should be determined by the risk of cardiovascular disease (CVD) or the presence of CVD without setting a low density lipoprotein cholesterol (LDL-C) target [8]. However, the LDL-C-lowering effect of statins in the Asian population can be more prominent than in Western populations [9]. Clinical trials did not include enough Asian populations, so it is unreasonable to apply the ADA guidelines in Korea. However, multiple clinical trials have demonstrated the beneficial effects of statin therapy on atherosclerotic cardiovascular disease (ASCVD) outcomes in subjects with and without CVD [10]. In a study of patients with acute coronary syndrome or previous CVD, the use of high-dose statins to reduce LDL-C to less than 70 mg/dL significantly reduced the risk of subsequent CVD [11]. Meta-analyses of randomized controlled trials demonstrated the benefits of statins in people without established CVD but with cardiovascular (CV) risk factors. The goal of LDL-C concentration is graded according to the risk level, and diabetic patients with CVD are classified as very high risk and should target LDL-C <70 mg/dL. In diabetic patients with target organ damages (albuminuria or glomerular filtration rate [GFR] <60 mL/min/1.73 m2) or CVD risk factors (hypertension, smoking, family history of premature ASCVD), LDL-C target of <70 mg/dL should be considered. In diabetic patients without CVD, the recommended target for LDL-C is <100 mg/dL.
In the Action to Control Cardiovascular Risk in Diabetes Blood Pressure (ACCORD-BP) study [12], an intensive blood pressure (BP) control strategy to achieve a systolic BP (SBP) <120 mm Hg did not significantly reduce the composite of CVD death, nonfatal myocardial infarction, and nonfatal stroke compared with a standard SBP control goal of <140 mm Hg. In contrast, the Systolic Blood Pressure Intervention Trial (SPRINT) found a significant reduction in the number of CVD events with intensive BP control to a goal SBP of <120 mm Hg but excluded those patients with T2DM [13]. It was reported that intensive BP control to a goal SBP of <120 mm Hg significantly reduced the risk of CVD outcomes in SPRINT-eligible ACCORD-BP participants [14]. Participants with DM in that study were eligible for the analysis if they were in the standard glucose control arm of ACCORD-BP and had the additional CVD risk factors required for SPRINT. According to the 2017 American College of Cardiology/American Heart Association (ACC/AHA) guideline for the management of high BP in adults, in adults with DM and hypertension, antihypertensive drug treatment should be initiated at a BP of 130/80 mm Hg or higher with a treatment goal of less than 130/80 mm Hg [15].
The risk and incidence of CVD in the Asian population are different from those in Western populations [16]. For Asian populations, the risk of stroke compared with coronary artery disease is higher. In addition, the relationship between BP levels and stoke incidence is stronger in Asian populations, and the slope of association between BP levels and stroke events has also been shown to be steeper in Asians than in Western populations. The recent study of Korean cohort data among patients with T2DM without underlying CVD at baseline showed that a BP <130/80 mm Hg was associated with further lowering of the risk of CV events [16], but an SBP <110 mm Hg or diastolic BP (DBP) <75 mm Hg was associated with a higher risk of all-cause mortality. However, there is no definitive study comparing the effect of lowering SBP to below 130 mm Hg as opposed to less than 140 mm Hg in diabetic patients without CVD, and most of the studies mentioned earlier have been conducted in diabetic patients with CVD or with many CV risk factors. Therefore, there is no clear evidence to maintain SBP below 130 mm Hg in diabetic patients without CVD. In a sub-analysis of the Hypertension Optimal Treatment (HOT) study, DBP control goals were divided into three groups, of 90, 85, and 80 mm Hg [17]. Unlike hypertensive patients without DM, hypertensive patients with DM recognized CV benefits when lower DBP was achieved, and the actual DBP was 81 mm Hg in the group aiming at less than 80 mm Hg. The target BP for diabetic patients is recommended <140/85 mm Hg. However, the target BP for diabetic patients with CVD should be considered <130/80 mm Hg.
According to the 2018 Korean Society for the Study of Obesity guidelines [18], the classification of obesity into classes I, II, and III relies on adult BMI, in accordance with WHO guidelines for the Asia-Pacific region. Class I obesity is defined as BMI 25 kg/m2 to less than 30 kg/m2, class II obesity is defined as BMI 30 kg/m2 to less than 35 kg/m2, and class III obesity was newly defined in 2018 as greater than 35 kg/m2. If a patient with T2DM and BMI >25 kg/m2 (class I) fails to lose weight with diet, physical activity, and behavior counseling, weight-loss medications may be considered.
Bariatric surgery should be considered in patients with T2DM if BMI ≥35 kg/m2 (class III obesity). Bariatric surgery may be considered in patients with T2DM ≥BMI 30 kg/m2 (class II obesity) if nonsurgical treatment fails to result in weight loss or glycemic control. A substantial body of evidence has now been accumulated, including data from randomized controlled clinical trials, demonstrating that bariatric surgery achieves superior glycemic control and reduction of CV risk factors in patients with T2DM and obesity compared with various medical interventions [19]. However, it is also reported that 35% to 50% of patients who initially achieve remission of DM after bariatric surgery eventually experience recurrence [20]. Regardless of remission of DM, nearly all patients with T2DM and obesity who undergo bariatric surgery maintain significant improvements of glycemic control and other CV risk factors. Thus, it is important to recognize bariatric surgery as one treatment for the management of obesity and DM rather than focusing on the remission of DM after bariatric surgery.
LSM is an essential component of treatment for all patients with T2DM and should be initiated promptly and simultaneously with antihyperglycemic agents. Patients' education within a structured program should be provided from a health care professional at the time of diagnosis and then followed up with regular reinforcement checks. For patients with newly diagnosed T2DM, LSM that includes medical nutrition therapy, weight control, physical activity, smoking cessation, and avoidance of alcohol abuse should be initiated.
As an initial therapy for newly diagnosed patients with an HbA1c <7.5%, metformin must first be considered as first-line oral therapy but other drugs can be considered based on patient status [21]. If metformin is not tolerable or is contraindicated, the alternative choices for monotherapy include dipeptidyl peptidase-4 (DPP-4) inhibitors, sodium-glucose cotransporter-2 (SGLT2) inhibitors, thiazolidinediones (TZDs), glucagon-like peptide 1 receptor agonists (GLP-1 RAs), sulfonylureas (SUs), glinides, α-glucosidase inhibitors, and insulin according to patient circumstances. In the Practical Evidence of Antidiabetic Monotherapy (PEAM) study, the glucose-lowering efficacies of SUs, metformin, and TZDs as antidiabetic monotherapies administered for 48 weeks were similar in drug-naïve Korean patients diagnosed with T2DM [22].
If the initial HbA1c level of a patient is ≥7.5% or the HbA1c target is not achieved within three months of initiating monotherapy, dual combination therapy can be considered. If the HbA1c target is not achieved within 3 months of initiating dual therapy, a third agent with a complementary mechanism of action can be added for triple combination therapy. The early combination therapy is preferred over maximizing the dosage of a single agent when considering glucose-lowering efficacy and side effects. Although there is no particular order of preference, efficacy, risk of hypoglycemia, weight gain, CV benefits, and presence of clinical data in the Korean population should be considered for this arrangement (Fig. 1) [23]. Metformin is maintained as background therapy during dual or triple combination therapy.
In the Empagliflozin Cardiovascular Outcome Event Trial in Type 2 Diabetes Mellitus Patients-Removing Excess Glucose (EMPA-REG OUTCOME) trial, empagliflozin added to the standard of care reduced the risk of three-point major adverse cardiovascular events (three-point MACE: composite of CV death, nonfatal myocardial infarction, or nonfatal stroke) by 14%, CV death by 38%, hospitalization for heart failure by 35%, and all-cause mortality by 32% in patients with T2DM and established CVD [24]. When the effects of empagliflozin in Asian patients were investigated (n=1,517), empagliflozin reduced the risk of three-point MACE by 32% (hazard ratio, 0.68; 95% confidence interval, 0.48 to 0.95) [25]. The effects of empagliflozin on the components of MACE, all-cause mortality, and heart failure outcomes in Asian patients were consistent with the overall population [25]. Therefore, for patients with established ASCVD, the SGLT2 inhibitors with proven CV benefits should first be considered.
The GLP-1 RAs with proven CV benefits should be considered [2627]. The GLP-1 RAs can be used in monotherapy or in combination with oral hypoglycemic agents other than DPP-4 inhibitors or in combination with basal insulin. Especially, the GLP-1 RAs with proven CV benefits should be considered in T2DM patients with established CVD [2627]. Both liraglutide and semaglutide significantly reduced a composite three-point MACE outcome and mortality compared with placebo-treated group [2627]. For patients with T2DM who fail to achieve the glycemic target with adequate treatment with oral antihyperglycemic agents, proceed to insulin injection therapy. The addition of a GLP-1 RA or switching to a premixed insulin regimen could be another option depending on the patient's clinical situation (Fig. 2). The initiation of insulin should be considered in patients with newly-diagnosed T2DM if the initial HbA1c level is >9.0% and symptomatic hyperglycemia or metabolic decompensation is present. Insulin also should be considered when adequate glycemic control is not obtained in patients with decompensated hepatic or renal insufficiency and when patients have suffered from myocardial infarction, stoke, or a major operation [28].
It is recommended that urinary albumin excretion and estimated GFR should be assessed at least once a year. A urine albumin-creatinine ratio ≥30 mg/g is generally defined as albuminuria, and decreased GFR is defined as GFR <60 mL/min/1.73 m2. Angiotensin-converting enzyme inhibitors and angiotensin II receptor antagonists are recommended as first-line medications for BP control in diabetic patients with albuminuria. Glycemic control has been shown to be effective to slow the progression of nephropathy in patients with early diabetic nephropathy. Recently, several hypoglycemic agents demonstrated beneficial effects on the progression of diabetic nephropathy. Empagliflozin showed a significantly lower risk of albuminuria progression or renal outcomes, such as a doubling of the serum creatinine level and initiation of renal-replacement therapy, than the placebo group [29]. Some GLP-1 RAs also demonstrated a renal protective effect in the Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results (LEADER) and the Preapproval Trial to Evaluate Cardiovascular and Other Long-term Outcomes with Semaglutide in Subjects with Type 2 Diabetes (SUSTAIN-6) trials [2630]. However, their renal outcome was studied as a secondary outcome. Recently, in T2DM with renal disease, canagloflozin lowered the risk of kidney failure or renal death about 30% than in the placebo group [31].
Appropriate clinical practice guidelines customized for Korean people with T2DM have been developed and updated to provide better glycemic control and favorable clinical outcomes. More evidence and clinical trials should be undertaken, especially in Asia, including Korea.
Acknowledgements
None

CONFLICTS OF INTEREST: No potential conflict of interest relevant to this article was reported.

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Fig. 1

Antihyperglycemic therapy algorithm for adult patients with type 2 diabetes mellitus (T2DM). The algorithm stratifies the choice of medications for T2DM based on initial glycated hemoglobin (HbA1c) levels and demonstrates drug arrangement in a centrifugal direction. This algorithm includes only U.S. Food and Drug Administration-approved classes of medications for T2DM that are prescribed in Korea. For newly diagnosed T2DM, begin with lifestyle modification (LSM) at the time of diagnosis and maintain these changes subsequently for the duration of treatment. The HbA1c target is <6.5%; if this is not achieved within 3 months after implementing LSM, then the use of an antihyperglycemic agent should be initiated promptly. If the HbA1c level is <7.5%, metformin monotherapy is the preferred choice for pharmacotherapy in conjunction with LSM. If there are contraindications for metformin or side effects, then consider other monotherapy options such as a dipeptidyl peptidase-4 inhibitor (DPP-4i), sodium-glucose cotransporter-2 inhibitor (SGLT2i), thiazolidinedione (TZD), glucagon-like peptide 1 receptor agonists (GLP-1 RAs), sulfonylurea (SU), α-glucosidase inhibitor (α-Gi), or insulin as the initial therapy according to the patient's condition. If the initial HbA1c level is ≥7.5% or the HbA1c target is not achieved within 3 months of monotherapy, dual combination therapy can be considered. In this case, a second-line drug is added to metformin; however, any other combination of drugs with different mechanisms of action can be used depending on the patient's clinical characteristics. If the HbA1c target is not achieved within 3 months after commencing dual therapy, then proceed to triple combination therapy. In no particular order of preference, efficacy, cardiovascular benefit, risk of hypoglycemia, impact of body weight, and presence of clinical data in the Korean population should be considered for this arrangement. To aid the physician's choice, the characteristics of antihyperglycemic agent classes are shown as a bar scale. Efficacy (green), CV benefit (blue), hypoglycemia risk (red), and body weight changes (yellow) were assigned ratings of low, intermediate, or high (body weight changes; decrease, neutral, or increase) based on recently published studies identified in an extensive literature review; the scale bar is not constructed according to strict definitions but should be used as a guide for clinical decisions. This figure was illustrated based on the drugs' approval by the Korea Food and Drug Administration (http://www.mfds.go.kr/eng) in April 2019 [23]. GLN, glinide. aBody weight changes: decrease, neutral, or increase, bGLN can be used as dual combination therapy with metformin, TZD, α-Gi, or insulin or as a triple combination therapy with metformin and α-Gi, metformin and TZD, or metformin and insulin.

dmj-43-398-g001.jpg
Fig. 2

Treatment algorithm for injectable therapy in type 2 diabetes mellitus (T2DM). (Left) Initiation of insulin treatment. If the initial glycated hemoglobin (HA1c) level is >9.0% and symptomatic hyperglycemia or metabolic decompensation is present, insulin therapy can be initiated with or without oral antihyperglycemic agents (OHAs) in patients with newly diagnosed T2DM. If the HA1c target range is not achieved after implementing a basal insulin regimen, then proceed to intensification treatment, for example, addition of a glucagon-like peptide 1 receptor agonist (GLP-1 RA) or a prandial insulin or switching to a premixed insulin regimen. (Right) For adult patients with T2DM who have not achieved their glycemic target following adequate treatment using OHAs. When OHAs fail, proceed to basal insulin either with or without OHAs. The addition of a GLP-1 RA or switching to a premixed insulin regimen could be another option depending on the patient's clinical situation. The width of each black line reflects the strength of the expert consensus recommendations. In patients above the HbA1c target on basal insulin or premixed insulin once or twice daily, further intensification outlined in this algorithm may be considered.

dmj-43-398-g002.jpg
Table 1

Diagnostic criteria for type 2 diabetes mellitus in Korea

dmj-43-398-i001.jpg
1. Glycated hemoglobin (HbA1c) level ≥6.5% (HbA1c concentration must be measured through a standardized method)a or
2. Eight-hour fasting plasma glucose of ≥126 mg/dLa or
3. Plasma glucose concentration of ≥200 mg/dL at 2 hours after a 75-g oral glucose tolerance testa or
4. Classic symptoms of diabetes (polyuria, polydipsia, unexplained weight loss) with a random plasma glucose concentration of ≥200 mg/dL

aDiagnosis must be confirmed through a repeat test on a different day. However, if more than two criteria are met on the same day, a definite diagnosis can be made.

Table 2

Targets of glycemic, blood pressure, and lipid control in patients with type 2 diabetes mellitus

dmj-43-398-i002.jpg
Cardiovascular diseases Present Absent
HbA1c, % <6.5
Blood pressure, mm Hg <130/80 <140/85
Lipid profiles
 LDL-C, mg/dL <70 <100a
 Triglycerides, mg/dL <150
 HDL-C, mg/dL >40 (men)
>50 (women)

HbA1c, glycated hemoglobin; LDL-C, low density lipoprotein cholesterol; HDL-C, high density lipoprotein cholesterol.

aTarget LDL-C is <70 mg/dL in the presence of target organ damage or cardiovascular risk factors.

Figure & Data

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      2019 Clinical Practice Guidelines for Type 2 Diabetes Mellitus in Korea
      Diabetes Metab J. 2019;43(4):398-406.   Published online August 20, 2019
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    2019 Clinical Practice Guidelines for Type 2 Diabetes Mellitus in Korea
    Image Image
    Fig. 1 Antihyperglycemic therapy algorithm for adult patients with type 2 diabetes mellitus (T2DM). The algorithm stratifies the choice of medications for T2DM based on initial glycated hemoglobin (HbA1c) levels and demonstrates drug arrangement in a centrifugal direction. This algorithm includes only U.S. Food and Drug Administration-approved classes of medications for T2DM that are prescribed in Korea. For newly diagnosed T2DM, begin with lifestyle modification (LSM) at the time of diagnosis and maintain these changes subsequently for the duration of treatment. The HbA1c target is <6.5%; if this is not achieved within 3 months after implementing LSM, then the use of an antihyperglycemic agent should be initiated promptly. If the HbA1c level is <7.5%, metformin monotherapy is the preferred choice for pharmacotherapy in conjunction with LSM. If there are contraindications for metformin or side effects, then consider other monotherapy options such as a dipeptidyl peptidase-4 inhibitor (DPP-4i), sodium-glucose cotransporter-2 inhibitor (SGLT2i), thiazolidinedione (TZD), glucagon-like peptide 1 receptor agonists (GLP-1 RAs), sulfonylurea (SU), α-glucosidase inhibitor (α-Gi), or insulin as the initial therapy according to the patient's condition. If the initial HbA1c level is ≥7.5% or the HbA1c target is not achieved within 3 months of monotherapy, dual combination therapy can be considered. In this case, a second-line drug is added to metformin; however, any other combination of drugs with different mechanisms of action can be used depending on the patient's clinical characteristics. If the HbA1c target is not achieved within 3 months after commencing dual therapy, then proceed to triple combination therapy. In no particular order of preference, efficacy, cardiovascular benefit, risk of hypoglycemia, impact of body weight, and presence of clinical data in the Korean population should be considered for this arrangement. To aid the physician's choice, the characteristics of antihyperglycemic agent classes are shown as a bar scale. Efficacy (green), CV benefit (blue), hypoglycemia risk (red), and body weight changes (yellow) were assigned ratings of low, intermediate, or high (body weight changes; decrease, neutral, or increase) based on recently published studies identified in an extensive literature review; the scale bar is not constructed according to strict definitions but should be used as a guide for clinical decisions. This figure was illustrated based on the drugs' approval by the Korea Food and Drug Administration (http://www.mfds.go.kr/eng) in April 2019 [23]. GLN, glinide. aBody weight changes: decrease, neutral, or increase, bGLN can be used as dual combination therapy with metformin, TZD, α-Gi, or insulin or as a triple combination therapy with metformin and α-Gi, metformin and TZD, or metformin and insulin.
    Fig. 2 Treatment algorithm for injectable therapy in type 2 diabetes mellitus (T2DM). (Left) Initiation of insulin treatment. If the initial glycated hemoglobin (HA1c) level is >9.0% and symptomatic hyperglycemia or metabolic decompensation is present, insulin therapy can be initiated with or without oral antihyperglycemic agents (OHAs) in patients with newly diagnosed T2DM. If the HA1c target range is not achieved after implementing a basal insulin regimen, then proceed to intensification treatment, for example, addition of a glucagon-like peptide 1 receptor agonist (GLP-1 RA) or a prandial insulin or switching to a premixed insulin regimen. (Right) For adult patients with T2DM who have not achieved their glycemic target following adequate treatment using OHAs. When OHAs fail, proceed to basal insulin either with or without OHAs. The addition of a GLP-1 RA or switching to a premixed insulin regimen could be another option depending on the patient's clinical situation. The width of each black line reflects the strength of the expert consensus recommendations. In patients above the HbA1c target on basal insulin or premixed insulin once or twice daily, further intensification outlined in this algorithm may be considered.
    2019 Clinical Practice Guidelines for Type 2 Diabetes Mellitus in Korea
    1. Glycated hemoglobin (HbA1c) level ≥6.5% (HbA1c concentration must be measured through a standardized method)a or
    2. Eight-hour fasting plasma glucose of ≥126 mg/dLa or
    3. Plasma glucose concentration of ≥200 mg/dL at 2 hours after a 75-g oral glucose tolerance testa or
    4. Classic symptoms of diabetes (polyuria, polydipsia, unexplained weight loss) with a random plasma glucose concentration of ≥200 mg/dL
    Cardiovascular diseasesPresentAbsent
    HbA1c, %<6.5
    Blood pressure, mm Hg<130/80<140/85
    Lipid profiles
     LDL-C, mg/dL<70<100a
     Triglycerides, mg/dL<150
     HDL-C, mg/dL>40 (men)
    >50 (women)
    Table 1 Diagnostic criteria for type 2 diabetes mellitus in Korea

    aDiagnosis must be confirmed through a repeat test on a different day. However, if more than two criteria are met on the same day, a definite diagnosis can be made.

    Table 2 Targets of glycemic, blood pressure, and lipid control in patients with type 2 diabetes mellitus

    HbA1c, glycated hemoglobin; LDL-C, low density lipoprotein cholesterol; HDL-C, high density lipoprotein cholesterol.

    aTarget LDL-C is <70 mg/dL in the presence of target organ damage or cardiovascular risk factors.

    Kim MK, Ko SH, Kim BY, Kang ES, Noh J, Kim SK, Park SO, Hur KY, Chon S, Moon MK, Kim NH, Kim SY, Rhee SY, Lee KW, Kim JH, Rhee EJ, Chun S, Yu SH, Kim DJ, Kwon HS, Park KS, . 2019 Clinical Practice Guidelines for Type 2 Diabetes Mellitus in Korea. Diabetes Metab J. 2019;43(4):398-406.
    Received: Jul 16, 2019; Accepted: Jul 22, 2019
    DOI: https://doi.org/10.4093/dmj.2019.0137.

    Diabetes Metab J : Diabetes & Metabolism Journal
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