Endocrinology and Metabolism

Brief Report

Diabetes, Obesity and Metabolism
Year-Long Trend in Glycated Hemoglobin Levels in Patients with Type 2 Diabetes during the COVID-19 Pandemic: Jonghwa Jin, Seong Wook Lee, Won-Ki Lee, Jae-Han Jeon, Jung-Guk Kim, In-Kyu Lee, Yeon-Kyung Choi, Keun-Gyu Park; Endocrinol Metab. 2021;36(5):1142-1146. Published online October 21, 2021; DOI: https://doi.org/10.3803/EnM.2021.1154

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Abstract PDF Supplementary Material PubReader ePub

It has been suggested that the coronavirus disease 2019 (COVID-19) pandemic has had a negative impact on glycemic control in patients with type 2 diabetes mellitus (T2DM). However, no study has examined yearly trends in glycated hemoglobin (HbA1c) levels after the start of the COVID-19 outbreak. Here, we performed a retrospective analysis of HbA1c concentrations during the early period of the COVID-19 outbreak (COVID-19 cohort) and then compared the yearly trend in the mean HbA1c level, along with fluctuations in HbA1c levels, with those during previous years (non-COVID-19 cohorts). We observed that the mean HbA1c level in patients with T2DM increased during the first 6 months of the COVID-19 outbreak. After 6 months, HbA1c levels in the COVID-19 cohort returned to levels seen in the non-COVID-19 cohorts. The data suggest that vulnerable patients with T2DM should be monitored closely during the early period of a pandemic to ensure they receive appropriate care.

Citations

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Physical and Mental Health Characteristics of Hospitalized COVID-19 Patients with and without Type 2 Diabetes Mellitus in Turkey
Abdulbari Bener, Murat Atmaca, Abdulla O. A. A. Al-Hamaq, Antonio Ventriglio
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A Hybrid Model of In-Person and Telemedicine Diabetes Education and Care for Management of Patients with Uncontrolled Type 2 Diabetes Mellitus: Findings and Implications from a Multicenter Prospective Study
Ayla M. Tourkmani, Turki J. Alharbi, Abdulaziz M. Bin Rsheed, Azzam F. Alotaibi, Mohammed S. Aleissa, Sultan Alotaibi, Amal S. Almutairi, Jancy Thomson, Ahlam S. Alshahrani, Hadil S. Alroyli, Hend M. Almutairi, Mashael A. Aladwani, Eman R. Alsheheri, Hyfa
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The indirect impact of the COVID-19 pandemic on people with type 2 diabetes mellitus and without COVID-19 infection: Systematic review and meta-analysis
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Journal of Patient Experience.2023;[Epub] CrossRef
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Original Articles

Clinical Study
Predictive Performance of Glycated Hemoglobin for Incident Diabetes Compared with Glucose Tolerance Test According to Central Obesity: Suji Yoo, Jaehoon Jung, Hosu Kim, Kyoung Young Kim, Soo Kyoung Kim, Jungwha Jung, Jong Ryeal Hahm, Jong Ha Baek; Endocrinol Metab. 2020;35(4):873-881. Published online December 23, 2020; DOI: https://doi.org/10.3803/EnM.2020.798

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Abstract PDF Supplementary Material PubReader ePub: Background
To examine whether glycated hemoglobin (HbA1c) test would be a suitable screening tool for detecting high-risk subjects for diabetes compared to oral glucose tolerance test (OGTT) according to accompanied central obesity.
Methods
In this prospective population-based cohort study, both OGTT and HbA1c tests were performed and continued every 2 years up to 12 years among individuals with non-diabetic state at baseline (aged 40 to 69 years, n=7,512). Incident diabetes was established by a doctor, HbA1c ≥6.5%, and/or fasting plasma glucose (FPG) ≥126 mg/dL, and/or 2-hour postprandial glucose (2hPG) level based on OGTT ≥200 mg/dL. Discriminative capacities of high HbA1c (≥5.7%) versus high 2hPG (≥140 mg/dL) for predicting incident diabetes were compared using Cox-proportional hazard regression and C-index.
Results
During the median 11.5 years of follow-up period, 1,341 (17.6%) developed diabetes corresponding to an incidence of 22.1 per 1,000 person-years. Isolated high 2hPG was associated with higher risk for incident diabetes (hazard ratio [HR], 4.29; 95% confidence interval [CI], 3.56 to 5.17) than isolated high HbA1c (HR, 2.79; 95% CI, 2.40 to 3.26; P<0.05). In addition, high 2hPG provided better discriminatory capacity than high HbA1c (C-index 0.79 vs. 0.75, P<0.05). Meanwhile, in subjects with central obesity, the HR (3.95 [95% CI, 3.01 to 5.18] vs. 2.82 [95% CI, 2.30 to 3.46]) and discriminatory capacity of incident diabetes (C-index 0.75 vs. 0.75) between two subgroups became comparable.
Conclusion
Even though the overall inferior predictive capacity of HbA1c test than OGTT, HbA1c test might plays a complementary role in identifying high risk for diabetes especially in subjects with central obesity with increased sensitivity.

Clinical Study
Relationships between Thigh and Waist Circumference, Hemoglobin Glycation Index, and Carotid Plaque in Patients with Type 2 Diabetes: Myung Ki Yoon, Jun Goo Kang, Seong Jin Lee, Sung-Hee Ihm, Kap Bum Huh, Chul Sik Kim; Endocrinol Metab. 2020;35(2):319-328. Published online June 24, 2020; DOI: https://doi.org/10.3803/EnM.2020.35.2.319

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Background
This study investigated the relationships of thigh and waist circumference with the hemoglobin glycation index (HGI) and carotid atherosclerosis in patients with type 2 diabetes.
Methods
This observational study included 3,075 Korean patients with type 2 diabetes, in whom anthropometric measurements and carotid ultrasonography were conducted. HGI was defined as the measured hemoglobin A1c (HbA1c) level minus the predicted HbA1c level, which was calculated using the linear relationship between HbA1c and fasting plasma glucose levels. Carotid atherosclerosis was defined as a clearly isolated focal plaque or focal wall thickening >50% of the surrounding intima-media thickness.
Results
The frequency of a positive HGI decreased with increasing thigh circumference in men and increased with increasing waist circumference in women after adjusting for potential confounding variables. Thigh and waist circumference had a combined augmentative effect on the likelihood of positive HGI, which was dramatically higher in patients in higher waist-to-thigh ratio quartiles (adjusted odds ratios for the highest compared to the lowest quartile: 1.595 in men and 1.570 in women). Additionally, the larger the thigh circumference, the lower the risk of carotid atherosclerosis, although in women, this relationship lacked significance after adjustment for potential confounders.
Conclusion
HGI was associated with thigh circumference in men and waist circumference in women. In addition, the combination of low thigh circumference and high waist circumference was strongly associated with a higher HGI in Korean patients with type 2 diabetes. In particular, thigh circumference was associated with carotid atherosclerosis in men. However, further longitudinal studies are warranted.

Citations

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Association between hemoglobin glycation index and subclinical myocardial injury in the general population free from cardiovascular disease
Zhenwei Wang, Yihai Liu, Jing Xie, Nai-Feng Liu
Nutrition, Metabolism and Cardiovascular Diseases.2022; 32(2): 469. CrossRef
Association of Hemoglobin Glycation Index With Contrast-Induced Acute Kidney Injury in Patients Undergoing Coronary Angiography: A Retrospective Study
Zhezhe Chen, Duanbin Li, Maoning Lin, Hangpan Jiang, Tian Xu, Yu Shan, Guosheng Fu, Min Wang, Wenbin Zhang
Frontiers in Physiology.2022;[Epub] CrossRef
Associations of continuous glucose monitoring-assessed glucose variability with intima-media thickness and ultrasonic tissue characteristics of the carotid arteries: a cross-sectional analysis in patients with type 2 diabetes
Naohiro Taya, Naoto Katakami, Tomoya Mita, Yosuke Okada, Satomi Wakasugi, Hidenori Yoshii, Toshihiko Shiraiwa, Akihito Otsuka, Yutaka Umayahara, Kayoko Ryomoto, Masahiro Hatazaki, Tetsuyuki Yasuda, Tsunehiko Yamamoto, Masahiko Gosho, Iichiro Shimomura, Hi
Cardiovascular Diabetology.2021;[Epub] CrossRef

Clinical Study
Fasting and Postprandial Hyperglycemia: Their Predictors and Contributions to Overall Hyperglycemia in Korean Patients with Type 2 Diabetes: Jaecheol Moon, Ji Young Kim, Soyeon Yoo, Gwanpyo Koh; Endocrinol Metab. 2020;35(2):290-297. Published online June 24, 2020; DOI: https://doi.org/10.3803/EnM.2020.35.2.290

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Background
This study aimed to identify factors that affect fasting hyperglycemia (FHG) and postprandial hyperglycemia (PPG) and their contributions to overall hyperglycemia in Korean patients with type 2 diabetes mellitus (T2DM).
Methods
This was a retrospective study conducted on 194 Korean T2DM patients with 7-point self-monitoring blood glucose (SMBG) profiles plotted in 4 days in 3 consecutive months. We calculated the areas corresponding to FHG and PPG (area under the curve [AUC]_FHG and AUC_PPG) and contributions (%) in the graph of the 7-point SMBG data. The levels of glycated hemoglobin (HbA1c) were categorized by tertiles, and the contributions of FHG and PPG were compared.
Results
The relative contribution of FHG increased (44.7%±5.6%, 58.0%±4.4%, 66.5%±2.8%; PANOVA=0.002, PTREND <0.001), while that of PPG decreased (55.3%±5.5%, 42.0%±4.4%, 33.5%±2.8%; PANOVA=0.002, PTREND <0.001) with the elevated HbA1c. Multivariate analysis showed that HbA1c (β=0.615, P<0.001), waist circumference (β=0.216, P=0.042), and triglyceride (β=0.121, P=0.048) had a significant association with AUCFHG. Only HbA1c (β=0.231, P=0.002) and age (β=0.196, P=0.009) was significantly associated with AUC_PPG.
Conclusion
The data suggested that in Korean T2DM patients, FHG predominantly contributed to overall hyperglycemia at higher HbA1c levels, whereas it contributed to PPG at lower HbA1c levels. It is recommended that certain factors, namely age, degree of glycemic control, obesity, or triglyceride levels, should be considered when prescribing medications for T2DM patients.

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Prospective study of the association between chronotype and cardiometabolic risk among Chinese young adults
Tingting Li, Yang Xie, Shuman Tao, Liwei Zou, Yajuan Yang, Fangbiao Tao, Xiaoyan Wu
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A new approach for investigating the relative contribution of basal glucose and postprandial glucose to HbA1C
Jing Ma, Hua He, Xiaojie Yang, Dawei Chen, Cuixia Tan, Li Zhong, Qiling Du, Xiaohua Wu, Yunyi Gao, Guanjian Liu, Chun Wang, Xingwu Ran
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Diabetes
Association between White Blood Cell Counts within Normal Range and Hemoglobin A1c in a Korean Population: Jae Won Hong, Jung Hyun Noh, Dong-Jun Kim; Endocrinol Metab. 2018;33(1):79-87. Published online January 30, 2018; DOI: https://doi.org/10.3803/EnM.2018.33.1.79

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Background

We examined whether white blood cell (WBC) count levels within normal range, could be associated with hemoglobin A1c (HbA1c) levels.

Methods

Among the 11,472 people (≥19 years of age) who participated in the 2011 to 2012 Korea National Health and Nutrition Examination, subjects with chronic disease or illness, including 807 patients with diabetes currently taking anti-diabetic medications and/or 1,149 subjects with WBC levels <4,000 or >10,000/µL were excluded.

Results

Overall, adjusted HbA1c levels increased across the WBC quartiles (5.55%±0.01%, 5.58%±0.01%, 5.60%±0.01%, and 5.65%±0.01%, P<0.001) after adjusting for confounding factors, such as age, gender, fasting plasma glucose, college graduation, smoking history, waist circumference, presence of hypertension, serum total cholesterol, serum triglyceride, and presence of anemia. The adjusted proportions (%) of HbA1c levels of ≥5.7%, ≥6.1%, and ≥6.5% showed significant increases across WBC quartiles (P<0.001, P=0.002, and P=0.022, respectively). Logistic regression analyses of WBC quartiles for the risk of HbA1c levels of ≥5.7%, ≥6.1%, and ≥6.5%, using the variables above as covariates, showed that the odds ratios of the fourth quartile of WBCs were 1.59 (95% confidence interval [CI], 1.35 to 1.89; P<0.001), 1.78 (95% CI, 1.31 to 2.42; P<0.001), and 2.03 (95% CI, 1.13 to 3.64; P=0.018), using the first quartile of WBCs as the reference.

Conclusion

HbA1c levels were positively associated with WBC levels within normal range in a general adult population.

Citations

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Vitamin D supplementation modulates glycated hemoglobin (HBA1c) in diabetes mellitus
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Hoda Atef Abdelsattar Ibrahim, Sherif Kaddah, Sara Mohamed Elkhateeb, Abeer Aboalazayem, Aya Ahmed Amin, Mahmoud Marei Marei
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Chiao-Nan Chen, Ting-Chung Chen, Shiow-Chwen Tsai, Chii-Min Hwu
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