INTRODUCTION

According to data from the Korea National Health and Nutrition Examination Survey, 13.8% of Korean adults aged ≥30 years had diabetes in 2018 [1]. The prevalence of impaired fasting glucose (IFG) was 26.9%. From 2016 to 2018, 35% of patients with diabetes were not diagnosed with diabetes. Moreover, among Koreans with diabetes, 53.2%, 61.3%, and 72% were obese, hypertensive, and had hypercholesterolemia, respectively [1]. Therefore, early detection, prevention, and proper management are important issues for diabetes. As an expert group, the Korean Diabetes Association (KDA) has tried to provide appropriate guidelines for these purposes and has cooperated with the government, stakeholders, and related organizations. As a part of this policy, the Committee of Clinical Practice Guidelines of KDA has regularly updated its practice guidelines [2] and recently published the 7th edition.

In this revised edition, the evidence level was classified into four categories: randomized controlled trials (RCTs), including systematic reviews, meta-analyses, and RCTs; non-randomized controlled studies (NRS); others; and expert opinions. According to the target population, each recommendation was classified as a “general recommendation” or a “limited recommendation” if it can be recommended for most subjects or specific subjects, respectively (Table 1).

The section on “Antihyperglycemic therapy for adult patients with diabetes” describes the general principles of treatment, including both oral and injectable medications, have been updated. Furthermore, new sections on the “Diagnosis, evaluation, and treatment of non-alcoholic fatty liver disease (NAFLD)” and “Continuous glucose monitoring (CGM) and insulin pump use in subjects with diabetes” have been added. Additionally, visual leaflets for practical information, video materials and web-based clinical decision supporting systems were developed at the same time to facilitate the implementation and widespread use of these guidelines [3]. A checklist for the comprehensive management of patients with diabetes is provided in the appendix.

DIAGNOSIS OF DIABETES MELLITUS

The diagnostic criteria for diabetes are based on fasting plasma glucose (FPG), 2-hour plasma glucose (2h-PG) during a 75 g oral glucose tolerance test (OGTT), or glycosylated hemoglobin (A1C) value (Table 2) [4]. The A1C test should be performed using a method that is certified by the National Glycohemoglobin Standardization Program and should be standardized or traceable to the Diabetes Control and Complications Trial reference assay [4]. Since 2011, A1C has been included as a diagnostic criterion in the KDA clinical practice guidelines [5].

Prediabetes is defined as an FPG value of 100 to 125 mg/dL (IFG), a 2h-PG value of 140 to 199 mg/dL after a 75 g oral glucose load (impaired glucose tolerance [IGT]), or A1C levels of 5.7% to 6.4% [2,4]. Specifically, the KDA has classified people with IFG into two stages according to their FPG levels: stage 1 IFG (FPG 100 to 109 mg/dL or A1C 5.7% to 6.0%) and stage 2 IFG (FPG 110 to 125 mg/dL or A1C 6.1% to 6.4%) [6].

SCREENING AND PREVENTION OF DIABETES

A screening test for diabetes mellitus should be conducted annually for adults over 40 years of age and adults over 30 years of age with risk factors by using the FPG, A1C, and 2h-PG levels during 75 g OGTT. For subjects with stage 1 IFG, the KDA had previously recommended annual FPG and A1C monitoring to screen for undiagnosed diabetes in the general population. The Korean Diabetes Prevention Study (KDPS), which is the first randomized controlled clinical trial on the prevention of diabetes in high-risk individuals by using intensive lifestyle modifications, is currently ongoing in Korea [7,8]. In the KDPS, 75 g OGTT results were obtained from 1,637 overweight or obese Korean adult participants. Among them, 27.2% had type 2 diabetes mellitus (T2DM), and 59.3% had IFG and/or IGT. On the basis of the FPG criteria, 31.4% and 21.5% of subjects were classified as having stage 1 IFG and stage 2 IFG, respectively. More importantly, 19.0% of stage 1 and 43.5% of stage 2 IFG subjects showed 2h-PG levels in the diabetic range [8]. Therefore, the 75 g OGTT should be actively considered for Korean adults who are overweight or obese (body mass index [BMI] ≥23.0 kg/m²) with stage 1 IFG (FPG 100 to 109 mg/dL) and for all adults with stage 2 IFG independent of BMI for early detection and prompt intervention (Expert opinion, General).

To prevent diabetes in subjects with prediabetes, prompt individualized lifestyle modification and education should be introduced according to their BMI. Pre-diabetic adults with a BMI <23 kg/m² should modify their lifestyle by using medical nutrition and exercise therapies (medium or high-level physical activity for at least 150 minutes per week) (Expert opinion, General). If adults have prediabetes and a BMI ≥23 kg/m², they should be asked to lose 5% to 10% of their body weight and maintain the reduced weight by lifestyle modification with medical nutrition and exercise therapies (RCT, General) [9-12]. The use of metformin may be considered to prevent the development of T2DM among adults with a BMI ≥23 kg/m² and aged 30 to 70 years (RCT, Limited) [13]. To maintain lifestyle modification, the patient should be continuously motivated and monitored in various ways, including individualized diabetes education and use of aids based on information and communications technology (Expert opinion, General) [12].

GLYCEMIC, BLOOD PRESSURE, AND LIPID CONTROL TARGETS IN T2DM

Intensive and strict glycemic control with lifestyle modifications has been emphasized to prevent microvascular and macrovascular diabetic complications in T2DM (RCT, General) [14-16]. Therefore, the long-term maintenance of glycemic control status within the near-normal range is very important for patients with diabetes [17]. The optimal A1C target for patients with T2DM is <6.5% via lifestyle modification and glucose-lowering agents (RCT, General) (Table 3), particularly in recently diagnosed, young patients with T2DM without severe complications or hypoglycemia (Expert opinion, General). However, the glycemic target should be individualized on the basis of the patients’ clinical characteristics. In patients with a history of severe hypoglycemia, advanced diabetic complications, short life expectancy, or advanced age, the glycemic target must be set by considering the risks of complications, such as hypoglycemia (NRS, General) [18-20].

Blood pressure (BP) should be measured at every clinic visit and at home (NRS, General). For patients with diabetes and BP >120/80 mm Hg, lifestyle modification should be initiated (RCT, General). The target BP level for patients with diabetes is <140 mm Hg systolic BP and 85 mm Hg diastolic BP (RCT, General) [21-25]. The target BP for patients with diabetes and cardiovascular disease (CVD) should be <130/80 mm Hg (Expert opinion, Limited) [26]. Patients with diabetes and high BP could be prescribed any class of antihypertensive medication as the primary medication for BP control to achieve the target range (RCT, General). There was no difference on the effect of preventing CVD between angiotensin-converting enzyme (ACE) inhibitors, angiotensin II receptor blockers (ARBs), calcium channel blockers, and beta-blockers, which can all be used as first-line antihypertensive agents in patients with T2DM [27,28]. If BP is not controlled by the initial antihypertensive medication, combination therapy using drugs with different mechanisms is recommended. However, the combination of ACE inhibitors and ARBs is not recommended (RCT, General). Patients with coronary artery disease and diabetes are advised to use ACE inhibitors or ARBs as a first-line therapy (RCT, General) [29]. ACE inhibitors or ARBs are also recommended when high BP is accompanied by albuminuria (NRS, General) [30-32].

To assess the risk of CVD, a serum lipid test, which measures total cholesterol, high-density lipoprotein cholesterol, triglycerides, and low-density lipoprotein cholesterol (LDL-C), should be performed at least once a year when diagnosing diabetes (Expert opinion, General). LDL-C concentration was graded according to risk level. Patients with diabetes and CVD are classified as very high risk, and LDL-C targets should be adjusted to <70 mg/dL (RCT, General) [33,34]. In individuals with diabetes who also have target organ damage (albuminuria or estimated glomerular filtration rate [eGFR] <60 mL/min/1.73 m²) or risk factors for CVD (hypertension, smoking, or family history of premature atherosclerotic CVD), an LDL-C target of <70 mg/dL should be considered (RCT, General) [35]. In patients with diabetes but without CVD, the recommended target for LDL-C is <100 mg/dL (RCT, General).

The primary drug of choice for the treatment of dyslipidemia is statins; however, if target lipid levels are not reached even with the maximum tolerated dose of statins, the addition of ezetimibe could be considered (RCT, General) [36-39]. For patients with CVD, a combination of statins and proprotein convertase subtilisin/kexin type 9 inhibitors is recommended if the LDL-C target has not been reached even after adding ezetimibe to the maximally tolerated doses of statins (RCT, Limited) [40,41]. For severe hypertriglyceridemia (>500 mg/dL), treatment with fenofibrate or omega-3 could be considered in the evaluation of secondary causes (NRS, General) [42]. Serum lipid tests need to be performed 4 to 12 weeks after the initiation of lipid-lowering therapy to evaluate the drug response and patient compliance (Expert opinion, General).

OBESITY MANAGEMENT IN T2DM

According to the 2020 Korean Society for the Study of Obesity Guidelines, the classification of obesity into classes I, II, and III relies on adult BMI and the World Health Organization guidelines for the Asia-Pacific region. Classes I and II obesity are defined as BMIs of 25.0 to 29.9 kg/m² and 30.0 to 34.9 kg/m², respectively; class III obesity was newly defined in 2018 as a BMI ≥35 kg/m² [43].

Obese adults with T2DM should lose at least 5% of their body weight via lifestyle modifications and maintain their reduced weight (RCT, General) [44,45]. If patients with T2DM and BMI ≥25 kg/m² (class I) fail to lose weight with diet, physical activity, and behavior counseling, anti-obesity medications can be considered (Others, Limited) [46-48]. If the use of antiobesity drugs does not result in a loss of more than 5% of body weight within 3 months, it is judged that the effect of the drug is not significant, and changing or discontinuing the drug should be considered (RCT, General). Bariatric surgery can be considered in patients with T2DM with a BMI ≥35 kg/m² (class III obesity). Bariatric surgery may also be considered in patients with T2DM with BMI ≥30 kg/m² (class II obesity) if nonsurgical treatment fails to lose weight or control glycemia (Table 4) [49,50]. Multidisciplinary care is needed before and after surgery to enhance the effectiveness and safety of bariatric surgery (Expert opinion, General).

ANTIHYPERGLYCEMIC THERAPY FOR ADULT PATIENTS WITH TYPE 1 DIABETES MELLITUS

The recommended glycemic target for patients with type 1 diabetes mellitus (T1DM) is an A1C <7.0% (RCT, General). All patients with T1DM should be systematically trained to adjust their insulin dose so that they can have flexible meals (RCT, General) [51-54]. The level of understanding following education and performance among patients with T1DM should be evaluated, and patients should receive regular feedback following a diagnosis of diabetes (Expert opinion, General). In addition, individualized self-management education should be provided upon diagnosis not only to patients with T1DM but also to parents/caregivers, and regular reassessment should be performed according to the patient’s growth and independent development of self-management (Expert opinion, Limited). In particular, patients with T1DM who develop hypoglycemia unawareness or severe hypoglycemia should receive specialized and professional education to prevent hypoglycemia and restore cognitive abilities in case of hypoglycemia (RCT, Limited) [55].

Individuals with T1DM should be treated with intensive insulin replacement using multiple daily injections (MDIs) of prandial and basal insulin or insulin pumps (RCT, General). Rapid-acting insulin analogs (lispro, glulisine, or aspart) and long-acting insulin analogs (glargine, detemir, or degludec) should be used first in patients with T1DM when treated with MDIs (RCT, General) [14,56-61].

ANTIHYPERGLYCEMIC THERAPY FOR ADULT PATIENTS WITH T2DM

Diabetes education for patients with T2DM is an essential and fundamental part of diabetes management. Certified healthcare professionals should actively educate the patient on lifestyle modification immediately upon diagnosis, and this should be continuously monitored (RCT, General). Following glucose-lowering agent initiation, monotherapy or combination therapy should be provided on the basis of the target and current A1C levels (RCT, General). In general, the glucoselowering efficacy (reduction of A1C) of monotherapy with an oral anti-diabetic drug is estimated to be 1.0%; therefore, if the current A1C is 1.5% to 2.0% higher than that of the target A1C, initial combination therapy is recommended (Figs. 1 and 2) [15,62]. However, insulin treatment should be prioritized if severe hyperglycemia (A1C >9.0%) is accompanied by symptoms of hyperglycemia (polydipsia, polyuria, weight loss, etc.) (Expert opinion, General) (Fig. 3). When choosing a glucoselowering agent, consider whether there are any associated comorbidities (heart failure [HF], established atherosclerotic cardiovascular disease [eASCVD], or chronic kidney disease [CKD]) (Fig. 4) as well as the glucose-lowering efficacy, hypoglycemia risk or weight change, side effects, treatment acceptability, age, personal value of life, and cost (Expert opinion, General) (Figs. 1 to 3).

Metformin is recommended as a first-line glucose-lowering agent in patients with T2DM and is maintained as long as there are no contraindications or intolerable side effects (RCT, General) (Fig. 1). In the Practical Evidence of Antidiabetic Monotherapy study, the glucose-lowering efficacy of sulfonylureas, metformin, and thiazolidinediones as a monotherapy administered for 48 weeks were similar in drug-naïve Korean patients with T2DM [63]. Metformin has adequate efficacy, low hypoglycemia risk, weight neutrality, and cost-effectiveness. However, if there are contraindications or intolerable side effects related to metformin use, a different class of medications can be considered (Expert opinion, General). If the target A1C level has not been achieved, the up-titration of existing medication, combination therapy using medications with different mechanisms of action, or use of injectable medication should actively be considered as soon as possible; however, dipeptidyl peptidase-4 (DPP-4) inhibitor and glucagon-like peptide 1 receptor agonist (GLP-1RA) should not be combined at the same time (RCT, General) (Fig. 2).

The recent Vildagliptin Efficacy in combination with metfoRmIn for earlY treatment of type 2 diabetes (VERIFY) trial demonstrated that an early intervention strategy with a combination therapy of vildagliptin plus metformin in treatment-naïve patients with T2DM provides more durable long-term clinical benefits than metformin monotherapy with a traditional stepwise increase in dosage [64]. According to a subgroup analysis of Korean patients with newly diagnosed T2DM among VERIFY trial participants, early combination treatment significantly and consistently improved long-term glycemic durability compared with monotherapy with metformin [65]. Therefore, to reduce the risk of failure of glycemic control, early initial combination therapy is recommended following the diagnosis of T2DM (RCT, Limited) (Fig. 1).

There is a strong correlation between adherence to glucose-lowering agents and metabolic control in T2DM. For each 10% increment in drug adherence, the A1C level decreases by 0.16% [66]. Therefore, adherence to medication should be checked regularly, and medication adjustment should not be delayed if necessary (Expert opinion, General).

Injectable therapy (GLP-1RA or insulin) is recommended when potent glucose-lowering efficacy is required (RCT, General) (Fig. 3) [67]. The addition of GLP-1RA, basal insulin, or premixed insulin is recommended equally [68-77]. If A1C target is not achieved with GLP-1RA or basal insulin-based therapy, free or fixed-ratio combination therapy of GLP-1RA and basal insulin could be considered (RCT, Limited) [72,78-94]. Intensification of insulin therapy with premixed insulin twice daily, basal-plus, or basal-bolus is also recommended to enhance blood glucose control (RCT, Limited) [95-99].

Regimens that include sodium-glucose cotransporter 2 (SGLT2) inhibitors or GLP-1RAs with proven cardiovascular (CV) benefits should be prioritized for combination therapy in patients with eASCVD (RCT, Limited) (Fig. 4). T2DM patients with CV risk factors who received empagliflozin treatment had a remarkably lower three-point major adverse cardiovascular event (MACE), including CV death, nonfatal myocardial infarction, and nonfatal stroke, compared with the placebo treatment group (hazard ratio, 0.86; 95% confidence interval, 0.74 to 0.99; EMPA-REG OUTCOME trial) (Table 5) [100]. The effects of empagliflozin on the components of MACE, all-cause mortality, and HF outcomes in Asian patients were also consistent with the overall population of the EMPA-REG study [101]. Dulaglutide [102], liraglutide [103], and semaglutide [104] significantly led to a lower composite three-point MACE outcome compared with the placebo (Table 6).

In patients with T2DM who had or were at risk for atherosclerotic CVD, SGLT2 inhibitor treatment with empagliflozin (EMPEROR-Reduced study), dapagliflozin (DECLARE-TIMI 58 study, DAPA-HF study), and ertugliflozin (VERTIS-CV study) showed lower rates of CV death and hospitalization for HF than placebo treatment regardless of the presence of diabetes [105-107]. For patients with HF, glucose-lowering agents, including SGLT2 inhibitors with proven CV benefits, should be prioritized (RCT, Limited). The use of SGLT2 inhibitors could be beneficial in patients with T2DM suffering from HF symptoms and reduced ejection fraction to reduce the aggravation of HF and death from CV causes (Table 5).

For patients with albuminuria or reduced eGFR, glucose-lowering agents, including SGLT2 inhibitors with proven renal and CV benefits, should be prioritized (RCT, Limited). According to the EMPA-REG OUTCOME trial, empagliflozin treatment led to a significantly lower risk of composite renal outcome (persistent doubling of serum creatinine level, end-stage kidney disease [i.e., the need for long-term dialysis or renal transplantation], or death from renal causes) compared with placebo [108]. The DECLARE-TIMI 58 study confirmed that dapagliflozin also led to a lower renal end-point compared with placebo treatment [105]. A recently published DAPACKD study showed that regardless of the presence or absence of diabetes, the risk of renal composite outcomes was significantly lower with dapagliflozin treatment than with placebo in patients with pre-existing CKD (eGFR, 25 to 75 mL/min/1.73 m²; urine albumin-to-creatinine ratio [UACR], 200 to 5,000) [109]. According to recent evidence from large-scale RCTs and meta-analyses, SGLT2 inhibitor treatment in patients with T2DM has proven beneficial effects on renal outcomes, such as progression of albuminuria, aggravation of eGFR, or initiation of renal replacement therapy. Most clinical trials were performed in patients with eASCVD, high risk of CVD, or CKD; therefore, we recommend SGLT2 inhibitors preferentially in these populations.

DIABETIC KIDNEY DISEASE (DIABETIC NEPHROPATHY)

UACR and eGFR should be evaluated in people with T2DM at the time of diagnosis and at least once a year (NRS, General) [110]. Blood glucose and BP should be controlled optimally to suppress the development and progression of diabetic kidney disease (RCT, General) [24]. Patients with diabetic kidney disease should avoid excessively high or low (≤0.8 g/kg/day) consumption of protein (RCT, General) [111,112]. In patients with diabetes, high BP, and albuminuria, ACE inhibitors or ARBs should be prescribed (RCT, General) [113-115]. The use of ACE inhibitors or ARBs to prevent the progression of diabetic kidney disease is not recommended in patients with normal BP (RCT, General) [116]. Treatment with SGLT2 inhibitors, which have proven CV and renal benefits, should be prioritized in cases of albuminuria or reduced eGFR (RCT, General) [105,109,117]. If the cause of kidney disease is unclear or if renal dysfunction has progressed (GFR <30 mL/min/1.73 m²), a nephrologist should be consulted (NRS, General).

DIABETIC NEUROPATHY AND FOOT CARE

Patients with T1DM should be screened 5 years after diagnosis; patients with T2DM should be screened for diabetes-related peripheral and autonomic neuropathy at the time of diagnosis of diabetes and then repeatedly tested every year (RCT, General). Screening tests for diabetic peripheral neuropathy include the Michigan Neuropathy Screening Instrument Questionnaire and a neurological physical examination (Michigan Neuropathy Screening Instrument Examination, a pinching test, and a temperature perception test) (RCT, General) [118,119]. In patients with symptoms or signs such as orthostatic hypotension and stable tachycardia, the patient should be tested for CV autonomic neuropathy (RCT, Limited). Strict glycemic control is recommended to prevent or delay the development of peripheral neuropathy and CV autonomic neuropathy in both T1DM and T2DM (RCT, General) [120]. In patients with neuropathic pain, pharmacologic treatment should be used to control the pain and improve the patient’s quality of life (RCT, General) [121,122]. Annual comprehensive evaluation to check for risk factors of foot ulcer and amputation and education for foot management should be conducted in adult patients with diabetes (RCT, General) [123]. Peripheral angiography examination should be performed in patients with severe claudication, weak pulse of the dorsalis pedis artery, or ankle brachial index ≤0.9 (Expert opinion, Limited) [124].

DIABETIC RETINOPATHY

The optimization of blood glucose, BP, and lipid control is recommended to reduce the risk of developing diabetic retinopathy or to prevent its progression (RCT, General) [15,125]. Patients with T1DM should undergo ophthalmic and comprehensive eye examinations, including the periphery of the retina, within 5 years of diagnosis. Patients with T2DM should undergo ophthalmic and comprehensive eye examinations, including the periphery of the retina, at the time of diagnosis and then every year (Expert opinion, General). If there are no signs of retinopathy and glycemia is well controlled, the patient can be examined at an interval of 1 to 2 years. If a woman with diabetes plans to become pregnant, she must undergo an eye examination in advance; if she becomes pregnant, she should undergo an eye examination within the first 3 months of pregnancy and receive counseling on the development and risk of diabetic retinopathy (RCT, General). The patient should be followed up every 3 months during pregnancy and up to 1 year postpartum [126]. The use of aspirin to prevent CVD does not increase the risk of retinal bleeding (RCT, General) [127]. When the illness progresses to proliferative diabetic retinopathy, panretinal photocoagulation should be performed by a specialist (Expert opinion, General) [128].

NAFLD IN T2DM

All adults with T2DM should undergo NAFLD evaluation by using alanine aminotransferase or abdominal ultrasonography (Expert opinion, General) [129]. For adults with T2DM and NAFLD, lifestyle modification is required to treat CV risk factors and fatty liver diseases (RCT, General). Adults with BMI ≥23 kg/m², NAFLD, and T2DM should lose at least 7% of their body weight to reduce liver inflammation (RCT, General) [130]. Thiazolidinedione can be used as the initial medication for NAFLD in adults with T2DM (RCT, Limited) [131]. GLP-1RAs can be used for the treatment of NAFLD in adults with T2DM (RCT, Limited) [132]. Metformin, DPP-4 inhibitors, vitamin E, statins, ursodeoxycholic acid, and pentoxifyline should not be used for the treatment of NAFLD (RCT, General) [133].

CGM SYSTEM AND INSULIN PUMP USE

CGM results and an ambulatory glucose profile should be analyzed using internationally standardized core metrics (NRS, General) [134]. The clinical benefits of CGM and insulin pump use can only be expected if the patients are trained to use these devices properly and if the information obtained for blood glucose control are properly applied (NRS, General). For adults who treated with MDIs of prandial and basal insulin or insulin pumps, training should be provided professionally and systematically (NRS, General). All adult T1DM patients should be encouraged to use real-time CGM devices to control blood glucose and lower the risk of hypoglycemia (RCT, General) [135-137]. Adults with T2DM who require MDIs may use realtime CGM devices for glycemic control (RCT, Limited) [138]. Adults with T2DM who receive treatment other than MDI can periodically perform real-time CGM to control blood glucose (RCT, Limited) [139]. The daily use of real-time CGM devices is recommended for pregnant women with T1DM to control blood glucose, lower the risk of hypoglycemia, and improve perinatal performance (RCT, General) [140].

To reduce the risk of severe hypoglycemia for adult patients with T1DM who experience severe hypoglycemia or hypoglycemia unawareness at least twice a year, insulin pumps rather than MDIs are also recommended even in the absence of CGM (RCT, Limited) [141]. Sensor-enhanced insulin pumps with built-in basal insulin injection interruption algorithms are recommended for adults with T1DM with a high risk of hypoglycemia despite the everyday use of CGM devices (RCT, Limited) [142]. Insulin pumps should only be considered if intensive education is preceded by a professional education system for adults with T2DM whose blood glucose is not controlled by MDIs (RCT, Limited) [143].

VACCINATION FOR PATIENTS WITH T2DM

An annual flu vaccine is recommended for patients with diabetes. Streptococcus pneumoniae vaccines should also be considered. Coronavirus disease 2019 (COVID-19) vaccination is recommended for patients with diabetes (Expert opinion, General) [144].

CONCLUSIONS

Despite the constant efforts of the KDA, healthcare professionals, and the Korean government, the achievement rates for the comprehensive management of diabetes via ABC clinical targets (A, A1C <6.5%; B, BP <140/85 mm Hg; C, LDL-C <100 mg/dL) to prevent and delay vascular complications are still low in Korean adult patients with T2DM. Only 11.5% of subjects achieved all three ABC targets from 2016 to 2018, although there was an increasing trend (9.4% in 2013–2014, 8.4% in 2013–2016, and 11.5% in 2016–2018) [145]. Patients with diabetes should receive active education from multidisciplinary certified and professional education teams and constant monitoring for adherence to self-management, nutrition, and exercise. To encourage and maintain a properly modified lifestyle, technology-based behavior therapy could be useful. Individualized glycemic target, early and intensive glucose control, clinical strategies to improve adherence to glucoselowering agents and to overcome clinical inertia are necessary to optimize glycemic control in patients with diabetes. In addition, regular check-up and early detection of acute or chronic vascular complications as well as treatment strategies with CV benefit-proven medications should be considered to reduce comorbidities or mortality in patients with diabetes. The timely updated Clinical Practice Guidelines of KDA will provide evidence-based recommendations to healthcare professionals and contribute the improvement of diabetes care in Korea.

NOTES

CONFLICTS OF INTEREST

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

FUNDING

This work was supported by the Korean Diabetes Association.

Acknowledgements

We would like to thank the following for their thoughtful peer review and endorsement of the guidelines: the Study group of Neuropathy, Nephropathy, Gestational Diabetes, Beta-cell and islet transplantation, Geriatrics of KDA; Committee of Education, Committee of Food and Nutrition, and Committee of Medical Practitioners of KDA; Korean Association of Internal Medicine; Korean Society of Nephrology; Korean Association of Obesity; Korean Society of Hypertension; Korean Association of Infection; Korean Society of Pediatric Endocrinology; Korean Association of Ophthalmology; Korean Association of Diabetes Dietetic Educators; Korean Association of Diabetes Nurse Educators; and Korean Society of Social Workers for Diabetes Education. We would also like to thank Esther Kim for her contribution to the systematic literature search.

Fig. 1.

Treatment algorithm 1 (initial therapy) for patients with type 2 diabetes mellitus (T2DM). The algorithm stratifies the strategy of glycemic control for T2DM based on initial glycosylated hemoglobin (A1C) levels and underlying comorbidities. For newly diagnosed T2DM, begin with comprehensive lifestyle modification (LSM) at the time of diagnosis and monitor continuously. If the initial severe hyperglycemia (A1C level >9.0%) is accompanied by symptoms of hyperglycemia (polydipsia, polyuria, weight loss, etc.), insulin treatment should be prioritized (algorithm 3). If heart failure (HF), established atherosclerotic cardiovascular disease (eASCVD), or chronic kidney disease (CKD) are present, follow algorithm 4. If glycemic target is not achieved within 3 months after LSM, then glucose-lowering agent should be initiated promptly. If the current A1C is 1.5% higher than that of the target A1C or the current A1C level is >7.5%, follow algorithm 2 (combination therapy). If the A1C level is 7.5% or less, metformin monotherapy is recommended as a first-line therapy. However, if there are contraindications or intolerable side effects related to metformin use, a different class of medications can be considered. Instead of metformin monotherapy, early combination therapy could be considered to reduce the risk of failure of glycemic control in some patients with newly diagnosed T2DM. eGFR, estimated glomerular filtration rate. ^aParticularly HF with reduced ejection fraction (HFrEF, clinical diagnosis of HF and left ventricular ejection fraction ≤40%), ^bA history of an acute coronary syndrome or myocardial infarction, stable or unstable angina, coronary heart disease with or without revascularization, other arterial revascularization, stroke, or peripheral artery disease assumed to be atherosclerotic in origin, ^ceGFR <60 mL/min/1.73 m² or urine albumin creatinine ratio ≥30 mg/g.

Fig. 2.

Treatment algorithm 2 (combination therapy) for patients with type 2 diabetes mellitus (T2DM). If the current glycosylated hemoglobin (A1C) is 1.5% higher than that of the target A1C or the current A1C level is >7.5%, combination therapy is recommended. If the target A1C level has not been achieved, the up-titration of existing medication, combination therapy using medications with different mechanisms of action, or use of injectable medication should actively be considered as soon as possible. When choosing glucose-lowering agents, consider glucose-lowering efficacy, hypoglycemia risk or weight change, side effects, treatment acceptability, age, personal value of life, and cost. The characteristics of glucose-lowering agents are expressed as a bar scale. Each color shows glycemic efficacy (green), hypoglycemia risk (red), and body weight change (yellow). HF, heart failure; eASCVD, established atherosclerotic cardiovascular disease; CKD, chronic kidney disease; eGFR, estimated glomerular filtration rate; DPP-4i, dipeptidyl peptidase-4 inhibitor; TZD, thiazolidinedione; SU, sulfonylurea; GLP-1RA, glucagon-like peptide-1 receptor agonist; SGLT2i, sodium-glucose cotransporter 2 inhibitor; α-GI, alpha-glucosidase inhibitor. ^aParticularly HF with reduced ejection fraction (HFrEF, clinical diagnosis of HF and left ventricular ejection fraction ≤40%), ^bHistory of acute coronary syndrome or myocardial infarction, stable or unstable angina, coronary heart disease with or without revascularization, other arterial revascularization, stroke, or peripheral artery disease assumed to be atherosclerotic in origin, ^ceGFR <60 mL/ min/1.73 m² or urine albumin creatinine ratio ≥30 mg/g, ^dGlinide can be used as a dual therapy with metformin, TZD, α-GI, or insulin. Glinide can be used as a triple therapy with metformin and α-GI, metformin and TZD, or metformin and insulin.

Fig. 3.

Treatment algorithm 3 (injectable therapy) for patients with type 2 diabetes mellitus (T2DM). If the glycosylated hemoglobin (A1C) level is >9.0% and symptomatic hyperglycemia or metabolic decompensation is present, insulin therapy can be initiated with or without oral anti-diabetic drug (OAD) in patients with T2DM. Injectable therapy (glucagon-like peptide-1 receptor agonist [GLP-1RA] or insulin) is recommended when potent glucose-lowering efficacy is required. The addition of GLP-1RA, basal insulin, or premixed insulin is recommended equally. If A1C target is not achieved with GLP-1RA or basal insulin-based therapy, free or fixed-ratio combination therapy of GLP-1RA and basal insulin could be considered. Intensification of insulin therapy with premixed insulin twice daily, basal-plus, or basal-bolus is also recommended to enhance blood glucose control.

Fig. 4.

Treatment algorithm 4 (comorbidities) for patients with type 2 diabetes mellitus who have heart failure (HF), established atherosclerotic cardiovascular disease (eASCVD), or chronic kidney disease (CKD). If patients have underlying above comorbidities, glucose-lowering agents, including sodium-glucose cotransporter 2 (SGLT2) inhibitor or glucagon-like peptide-1 receptor agonist (GLP1-RA), are the preferred choice. For patients with HF, glucose-lowering agents, including SGLT2 inhibitors with proven cardiovascular (CV) benefits, should be prioritized. Regimens that include SGLT2 inhibitors or GLP-1RAs with proven CV benefits should be prioritized for combination therapy in patients with eASCVD. For patients with albuminuria or reduced estimated glomerular filtration rate (eGFR), glucose-lowering agents, including SGLT2 inhibitors with proven renal and CV benefits, should be prioritized. A1C, glycosylated hemoglobin; Met, metformin; TZD, thiazolidinedione. ^aParticularly HF with reduced ejection fraction (HFrEF, clinical diagnosis of HF and left ventricular ejection fraction ≤40%), ^bHistory of acute coronary syndrome or myocardial infarction, stable or unstable angina, coronary heart disease with or without revascularization, other arterial revascularization, stroke, or peripheral artery disease assumed to be atherosclerotic in origin, ^ceGFR <60 mL/min/1.73 m² or urine albumin creatinine ratio ≥30 mg/g, ^dDapagliflozin, empagliflozin, ertugliflozin, ^eDapagliflozin, empagliflozin, ^fDulaglutide, liraglutide, semaglutide, ^gPioglitazone.

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About this article

Hur KY, Moon MK, Park JS, Kim SK, Lee SH, Yun JS, Baek JH, Noh J, Lee BW, Oh TJ, Chon S, Yang YS, Son JW, Choi JH, Song KH, Kim NH, Kim SY, Kim JW, Rhee SY, Lee YB, Jin SM, Kim JH, Kim CH, Kim DJ, Chun S, Rhee EJ, Kim HM, Kim HJ, Jee D, Kim JH, Choi WS, Lee EY, Yoon KH, Ko SH; Committee of Clinical Practice Guidelines, Korean Diabetes Association. 2021 Clinical Practice Guidelines for Diabetes Mellitus in Korea. Diabetes Metab J. 2021;45(4):461-481.

Received: Jul 11, 2021; Accepted: Jul 21, 2021

DOI: https://doi.org/10.4093/dmj.2021.0156.

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