Endocrinology and Metabolism

Choon Hee Chung (Chung CH)

37 Articles

Adrenal gland
2023 Korean Endocrine Society Consensus Guidelines for the Diagnosis and Management of Primary Aldosteronism: Jeonghoon Ha, Jung Hwan Park, Kyoung Jin Kim, Jung Hee Kim, Kyong Yeun Jung, Jeongmin Lee, Jong Han Choi, Seung Hun Lee, Namki Hong, Jung Soo Lim, Byung Kwan Park, Jung-Han Kim, Kyeong Cheon Jung, Jooyoung Cho, Mi-kyung Kim, Choon Hee Chung, The Committee of Clinical Practice Guideline of Korean Endocrine Society, The Korean Adrenal Study Group of Korean Endocrine Society; Endocrinol Metab. 2023;38(6):597-618. Published online October 13, 2023; DOI: https://doi.org/10.3803/EnM.2023.1789

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Primary aldosteronism (PA) is a common, yet underdiagnosed cause of secondary hypertension. It is characterized by an overproduction of aldosterone, leading to hypertension and/or hypokalemia. Despite affecting between 5.9% and 34% of patients with hypertension, PA is frequently missed due to a lack of clinical awareness and systematic screening, which can result in significant cardiovascular complications. To address this, medical societies have developed clinical practice guidelines to improve the management of hypertension and PA. The Korean Endocrine Society, drawing on a wealth of research, has formulated new guidelines for PA. A task force has been established to prepare PA guidelines, which encompass epidemiology, pathophysiology, clinical presentation, diagnosis, treatment, and follow-up care. The Korean clinical guidelines for PA aim to deliver an evidence-based protocol for PA diagnosis, treatment, and patient monitoring. These guidelines are anticipated to ease the burden of this potentially curable condition.

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Correlation of Histopathologic Subtypes of Primary Aldosteronism with Clinical Phenotypes and Postsurgical Outcomes
Chang Ho Ahn, You-Bin Lee, Jae Hyeon Kim, Young Lyun Oh, Jung Hee Kim, Kyeong Cheon Jung
The Journal of Clinical Endocrinology & Metabolism.2023;[Epub] CrossRef

Diabetes, Obesity and Metabolism
EW-7197 Attenuates the Progression of Diabetic Nephropathy in db/db Mice through Suppression of Fibrogenesis and Inflammation: Kyung Bong Ha, Weerapon Sangartit, Ah Reum Jeong, Eun Soo Lee, Hong Min Kim, Soyeon Shim, Upa Kukongviriyapan, Dae-Kee Kim, Eun Young Lee, Choon Hee Chung; Endocrinol Metab. 2022;37(1):96-111. Published online February 28, 2022; DOI: https://doi.org/10.3803/EnM.2021.1305

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Background
Diabetic nephropathy (DN) is characterized by albuminuria and accumulation of extracellular matrix (ECM) in kidney. Transforming growth factor-β (TGF-β) plays a central role in promoting ECM accumulation. We aimed to examine the effects of EW-7197, an inhibitor of TGF-β type 1 receptor kinase (ALK5), in retarding the progression of DN, both in vivo, using a diabetic mouse model (db/db mice), and in vitro, in podocytes and mesangial cells.
Methods
In vivo study: 8-week-old db/db mice were orally administered EW-7197 at a dose of 5 or 20 mg/kg/day for 10 weeks. Metabolic parameters and renal function were monitored. Glomerular histomorphology and renal protein expression were evaluated by histochemical staining and Western blot analyses, respectively. In vitro study: DN was induced by high glucose (30 mM) in podocytes and TGF-β (2 ng/mL) in mesangial cells. Cells were treated with EW-7197 (500 nM) for 24 hours and the mechanism associated with the attenuation of DN was investigated.
Results
Enhanced albuminuria and glomerular morphohistological changes were observed in db/db compared to that of the nondiabetic (db/m) mice. These alterations were associated with the activation of the TGF-β signaling pathway. Treatment with EW-7197 significantly inhibited TGF-β signaling, inflammation, apoptosis, reactive oxygen species, and endoplasmic reticulum stress in diabetic mice and renal cells.
Conclusion
EW-7197 exhibits renoprotective effect in DN. EW-7197 alleviates renal fibrosis and inflammation in diabetes by inhibiting downstream TGF-β signaling, thereby retarding the progression of DN. Our study supports EW-7197 as a therapeutically beneficial compound to treat DN.

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TGF-β signaling in health, disease, and therapeutics
Ziqin Deng, Tao Fan, Chu Xiao, He Tian, Yujia Zheng, Chunxiang Li, Jie He
Signal Transduction and Targeted Therapy.2024;[Epub] CrossRef
Oxidative stress and inflammation in diabetic nephropathy: role of polyphenols
Qi Jin, Tongtong Liu, Yuan Qiao, Donghai Liu, Liping Yang, Huimin Mao, Fang Ma, Yuyang Wang, Liang Peng, Yongli Zhan
Frontiers in Immunology.2023;[Epub] CrossRef
Beneficial Effects of a Curcumin Derivative and Transforming Growth Factor-β Receptor I Inhibitor Combination on Nonalcoholic Steatohepatitis
Kyung Bong Ha, Eun Soo Lee, Na Won Park, Su Ho Jo, Soyeon Shim, Dae-Kee Kim, Chan Mug Ahn, Choon Hee Chung
Diabetes & Metabolism Journal.2023; 47(4): 500. CrossRef

Adrenal Gland
Metabolic Subtyping of Adrenal Tumors: Prospective Multi-Center Cohort Study in Korea: Eu Jeong Ku, Chaelin Lee, Jaeyoon Shim, Sihoon Lee, Kyoung-Ah Kim, Sang Wan Kim, Yumie Rhee, Hyo-Jeong Kim, Jung Soo Lim, Choon Hee Chung, Sung Wan Chun, Soon-Jib Yoo, Ohk-Hyun Ryu, Ho Chan Cho, A Ram Hong, Chang Ho Ahn, Jung Hee Kim, Man Ho Choi; Endocrinol Metab. 2021;36(5):1131-1141. Published online October 21, 2021; DOI: https://doi.org/10.3803/EnM.2021.1149

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Background
Conventional diagnostic approaches for adrenal tumors require multi-step processes, including imaging studies and dynamic hormone tests. Therefore, this study aimed to discriminate adrenal tumors from a single blood sample based on the combination of liquid chromatography-mass spectrometry (LC-MS) and machine learning algorithms in serum profiling of adrenal steroids.
Methods
The LC-MS-based steroid profiling was applied to serum samples obtained from patients with nonfunctioning adenoma (NFA, n=73), Cushing’s syndrome (CS, n=30), and primary aldosteronism (PA, n=40) in a prospective multicenter study of adrenal disease. The decision tree (DT), random forest (RF), and extreme gradient boost (XGBoost) were performed to categorize the subtypes of adrenal tumors.
Results
The CS group showed higher serum levels of 11-deoxycortisol than the NFA group, and increased levels of tetrahydrocortisone (THE), 20α-dihydrocortisol, and 6β-hydroxycortisol were found in the PA group. However, the CS group showed lower levels of dehydroepiandrosterone (DHEA) and its sulfate derivative (DHEA-S) than both the NFA and PA groups. Patients with PA expressed higher serum 18-hydroxycortisol and DHEA but lower THE than NFA patients. The balanced accuracies of DT, RF, and XGBoost for classifying each type were 78%, 96%, and 97%, respectively. In receiver operating characteristics (ROC) analysis for CS, XGBoost, and RF showed a significantly greater diagnostic power than the DT. However, in ROC analysis for PA, only RF exhibited better diagnostic performance than DT.
Conclusion
The combination of LC-MS-based steroid profiling with machine learning algorithms could be a promising one-step diagnostic approach for the classification of adrenal tumor subtypes.

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Treating Primary Aldosteronism-Induced Hypertension: Novel Approaches and Future Outlooks
Nathan Mullen, James Curneen, Padraig T Donlon, Punit Prakash, Irina Bancos, Mark Gurnell, Michael C Dennedy
Endocrine Reviews.2024; 45(1): 125. CrossRef
Steroid profiling in adrenal disease
Danni Mu, Dandan Sun, Xia Qian, Xiaoli Ma, Ling Qiu, Xinqi Cheng, Songlin Yu
Clinica Chimica Acta.2024; 553: 117749. CrossRef
Plasma steroid profiling combined with machine learning for the differential diagnosis in mild autonomous cortisol secretion from nonfunctioning adenoma in patients with adrenal incidentalomas
Danni Mu, Xia Qian, Yichen Ma, Xi Wang, Yumeng Gao, Xiaoli Ma, Shaowei Xie, Lian Hou, Qi Zhang, Fang Zhao, Liangyu Xia, Liling Lin, Ling Qiu, Jie Wu, Songlin Yu, Xinqi Cheng
Endocrine Practice.2024;[Epub] CrossRef
Mild autonomous cortisol secretion: pathophysiology, comorbidities and management approaches
Alessandro Prete, Irina Bancos
Nature Reviews Endocrinology.2024;[Epub] CrossRef
Serum and hair steroid profiles in patients with nonfunctioning pituitary adenoma undergoing surgery: A prospective observational study
Seung Shin Park, Yong Hwy Kim, Ho Kang, Chang Ho Ahn, Dong Jun Byun, Man Ho Choi, Jung Hee Kim
The Journal of Steroid Biochemistry and Molecular Biology.2023; 230: 106276. CrossRef
Recent Updates on the Management of Adrenal Incidentalomas
Seung Shin Park, Jung Hee Kim
Endocrinology and Metabolism.2023; 38(4): 373. CrossRef
LC-MS based simultaneous profiling of adrenal hormones of steroids, catecholamines, and metanephrines
Jongsung Noh, Chaelin Lee, Jung Hee Kim, Seung Woon Myung, Man Ho Choi
Journal of Lipid Research.2023; 64(11): 100453. CrossRef
2023 Korean Endocrine Society Consensus Guidelines for the Diagnosis and Management of Primary Aldosteronism
Jeonghoon Ha, Jung Hwan Park, Kyoung Jin Kim, Jung Hee Kim, Kyong Yeun Jung, Jeongmin Lee, Jong Han Choi, Seung Hun Lee, Namki Hong, Jung Soo Lim, Byung Kwan Park, Jung-Han Kim, Kyeong Cheon Jung, Jooyoung Cho, Mi-kyung Kim, Choon Hee Chung
Endocrinology and Metabolism.2023; 38(6): 597. CrossRef
Toward Systems-Level Metabolic Analysis in Endocrine Disorders and Cancer
Aliya Lakhani, Da Hyun Kang, Yea Eun Kang, Junyoung O. Park
Endocrinology and Metabolism.2023; 38(6): 619. CrossRef
Prevalence and Characteristics of Adrenal Tumors in an Unselected Screening Population
Ying Jing, Jinbo Hu, Rong Luo, Yun Mao, Zhixiao Luo, Mingjun Zhang, Jun Yang, Ying Song, Zhengping Feng, Zhihong Wang, Qingfeng Cheng, Linqiang Ma, Yi Yang, Li Zhong, Zhipeng Du, Yue Wang, Ting Luo, Wenwen He, Yue Sun, Fajin Lv, Qifu Li, Shumin Yang
Annals of Internal Medicine.2022; 175(10): 1383. CrossRef

Diabetes, Obesity and Metabolism
Tetrahydrocurcumin Ameliorates Kidney Injury and High Systolic Blood Pressure in High-Fat Diet-Induced Type 2 Diabetic Mice: Weerapon Sangartit, Kyung Bong Ha, Eun Soo Lee, Hong Min Kim, Upa Kukongviriyapan, Eun Young Lee, Choon Hee Chung; Endocrinol Metab. 2021;36(4):810-822. Published online August 27, 2021; DOI: https://doi.org/10.3803/EnM.2021.988

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Background
Activation of the intrarenal renin-angiotensin system (RAS) is implicated in the pathogenesis of kidney injury and hypertension. We aimed to investigate the protective effect of tetrahydrocurcumin (THU) on intrarenal RAS expression, kidney injury, and systolic blood pressure (SBP) in high-fat diet (HFD)-induced type 2 diabetic mice.
Methods
Eight-week-old male mice were fed a regular diet (RD) or HFD for 12 weeks, and THU (50 or 100 mg/kg/day) was intragastrically administered with HFD. Physiological and metabolic changes were monitored and the expression of RAS components and markers of kidney injury were assessed.
Results
HFD-fed mice exhibited hyperglycemia, insulin resistance, and dyslipidemia compared to those in the RD group (P<0.05). Kidney injury in these mice was indicated by an increase in the ratio of albumin to creatinine, glomerular hypertrophy, and the effacement of podocyte foot processes. Expression of intrarenal angiotensin-converting enzyme, angiotensin II type I receptor, nicotinamide adenine dinucleotide phosphate (NADPH) oxidase-4, and monocyte chemoattractant protein-1 was also markedly increased in HFD-fed mice. HFD-fed mice exhibited elevated SBP that was accompanied by an increase in the wall thickness and vascular cross-sectional area (P<0.05), 12 weeks post-HFD consumption. Treatment with THU (100 mg/kg/day) suppressed intrarenal RAS activation, improved insulin sensitivity, and reduced SBP, thus, attenuating kidney injury in these mice.
Conclusion
THU alleviated kidney injury in mice with HFD-induced type 2 diabetes, possibly by blunting the activation of the intrarenal RAS/nicotinamide adenine dinucleotide phosphate oxidase IV (NOX4)/monocyte chemoattractant protein 1 (MCP-1) axis and by lowering the high SBP.

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The Development of Dyslipidemia in Chronic Kidney Disease and Associated Cardiovascular Damage, and the Protective Effects of Curcuminoids
Zeltzin Alejandra Ceja-Galicia, Ana Karina Aranda-Rivera, Isabel Amador-Martínez, Omar Emiliano Aparicio-Trejo, Edilia Tapia, Joyce Trujillo, Victoria Ramírez, José Pedraza-Chaverri
Foods.2023; 12(5): 921. CrossRef
Translation Animal Models of Diabetic Kidney Disease: Biochemical and Histological Phenotypes, Advantages and Limitations
Wenting Luo, Shiyun Tang, Xiang Xiao, Simin Luo, Zixuan Yang, Wei Huang, Songqi Tang
Diabetes, Metabolic Syndrome and Obesity.2023; Volume 16: 1297. CrossRef
Curcumin ameliorates focal segmental glomerulosclerosis by inhibiting apoptosis and oxidative stress in podocytes
Hui Zhang, Qing-Qing Dong, Hua-Pan Shu, Yu-Chi Tu, Qian-Qian Liao, Li-Jun Yao
Archives of Biochemistry and Biophysics.2023; 746: 109728. CrossRef
An examination of the protective effects and molecular mechanisms of curcumin, a polyphenol curcuminoid in diabetic nephropathy
Xiaoyu Zhu, Xingli Xu, Chigang Du, Yanping Su, Lixue Yin, Xiaoqiu Tan, Hui Liu, Yiru Wang, Lei Xu, Xinghua Xu
Biomedicine & Pharmacotherapy.2022; 153: 113438. CrossRef
An integrated bioinformatics analysis and experimental study identified key biomarkers CD300A or CXCL1, pathways and immune infiltration in diabetic nephropathy mice
WEI LIANG, QIANG LUO, ZONGWEI ZHANG, KEJU YANG, ANKANG YANG, QINGJIA CHI, HUAN HU
BIOCELL.2022; 46(8): 1989. CrossRef

Endocrine Research
Effects of Oxytocin on Cell Proliferation in a Corticotroph Adenoma Cell Line: Jung Soo Lim, Young Woo Eom, Eun Soo Lee, Hyeong Ju Kwon, Ja-Young Kwon, Junjeong Choi, Choon Hee Chung, Young Suk Jo, Eun Jig Lee; Endocrinol Metab. 2019;34(3):302-313. Published online September 26, 2019; DOI: https://doi.org/10.3803/EnM.2019.34.3.302

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Background

Oxytocin (OXT) has been reported to act as a growth regulator in various tumor cells. However, there is a paucity of data on the influence of OXT on cell proliferation of corticotroph adenomas. This study aimed to examine whether OXT affects cell growth in pituitary tumor cell lines (AtT20 and GH3 cells) with a focus on corticotroph adenoma cells.

Methods

Reverse transcription polymerase chain reaction and enzyme-linked immunosorbent assay were conducted with AtT20 cells to confirm the effects of OXT on hormonal activity; flow cytometry was used to assess changes in the cell cycle after OXT treatment. Moreover, the impact of OXT on proliferating cell nuclear antigen (PCNA), nuclear factor κB, and mitogen-activated protein kinase signaling pathway was analyzed by Western blot.

Results

OXT treatment of 50 nM changed the gene expression of OXT receptor and pro-opiomelanocortin within a short time. In addition, OXT significantly reduced adrenocorticotropic hormone secretion within 1 hour. S and G2/M populations of AtT20 cells treated with OXT for 24 hours were significantly decreased compared to the control. Furthermore, OXT treatment decreased the protein levels of PCNA and phosphorylated extracellular-signal-regulated kinase (P-ERK) in AtT20 cells.

Conclusion

Although the cytotoxic effect of OXT in AtT20 cells was not definite, OXT may blunt cell proliferation of corticotroph adenomas by altering the cell cycle or reducing PCNA and P-ERK levels. Further research is required to investigate the role of OXT as a potential therapeutic target in corticotroph adenomas.

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Increased proliferation and neuronal fate in prairie vole brain progenitor cells cultured in vitro: effects by social exposure and sexual dimorphism
Daniela Ávila-González, Italo Romero-Morales, Lizette Caro, Alejandro Martínez-Juárez, Larry J. Young, Francisco Camacho-Barrios, Omar Martínez-Alarcón, Analía E. Castro, Raúl G. Paredes, Néstor F. Díaz, Wendy Portillo
Biology of Sex Differences.2023;[Epub] CrossRef
Anterior pituitary gland synthesises dopamine from l‐3,4‐dihydroxyphenylalanine (l‐dopa)
Santiago Jordi Orrillo, Nataly de Dios, Antonela Sofía Asad, Fernanda De Fino, Mercedes Imsen, Ana Clara Romero, Sandra Zárate, Jimena Ferraris, Daniel Pisera
Journal of Neuroendocrinology.2020;[Epub] CrossRef

Miscellaneous
An Unusual Case of Meningioma Showing Increased CaSR Expression with Parathyroid Carcinoma: Jin Sae Yoo, Hong Min Kim, Sera Kim, Tak Ho Kang, Mee Yon Cho, Choon Hee Chung; Endocrinol Metab. 2018;33(1):133-134. Published online January 30, 2018; DOI: https://doi.org/10.3803/EnM.2018.33.1.133

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A Case of Primary Hyperparathyroidism Associated with Gall-bladder Stone and Chronic Cholecystitis.: Jin Hyung Lee, Pil Moon Jung, Chong Whan Kim, Myeong Sang Shin, Hong Jun Park, Soo Min Nam, Mi Young Lee, Jang Hyun Koh, Mee Yoen Cho, Jang Yel Shin, Choon Hee Chung, Young Goo Shin; J Korean Endocr Soc. 2007;22(6):470-474. Published online December 1, 2007; DOI: https://doi.org/10.3803/jkes.2007.22.6.470

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Abstract PDF: Primary hyperparathyroidism is caused mainly by a parathyroid adenoma or hyperplasia, and is characterized by hypercalcemia and hypophosphatemia induced by an increased level of parathyroid hormone (PTH). Patients with primary hyperparathyroidism are usually asymptomatic and the disease is most often detected incidentally. However, patients can present with symptoms of renal stones, peptic ulcer disease, muscle weakness, depression, constipation, and pancreatitis. In addition, it has been reported that choletithiasis can be combined with primary hyperparathyroidism. We report a case of a 49-year-old man with primary hyperparathyroidism accompanied with chronic cholecystitis caused by a gallbladder (GB) stone. The chief complaint was nausea, poor oral intake, abdominal pain, and weight loss. Abdominal sonography was performed and chronic cholecystitis with a GB stone was diagnosed. The serum calcium level was 18.5 mg/dL and the intact parathyroid hormone level was 1,777 pg/mL. A parathyroid mass was detected by neck-computed tomography, neck ultrasonography and a (99m)Tc-Tetrofosmin parathyroid scan. The parathyroid mass was removed and the mass was confirmed as a parathyroid adenoma. Cholecystectomy was performed and the diagnosis of chronic cholecystitis was confirmed. After the surgical procedure, the symptoms improved and the calcium level was normalized.

A Case of Graves' Disease with Ulcerative Colitis.: Pil Moon Jung, Mi Young Lee, Jang Hyun Koh, Jang Yeol Shin, Young Goo Shin, Mi Yeion Jo, Choon Hee Chung; J Korean Endocr Soc. 2007;22(2):149-152. Published online April 1, 2007; DOI: https://doi.org/10.3803/jkes.2007.22.2.149

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A Case of Adrenal Incidentaloma with a Pituitary Incidentaloma.: Myoung Kyu Lee, Su Min Nam, Jang Hyoun Ko, Mi Young Lee, Jang Yeol Sin, Kwang Wha Park, Choon Hee Chung; J Korean Endocr Soc. 2006;21(6):577-582. Published online December 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.6.577

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Abstract PDF: Incidentaloma is defined as an asymptomatic mass lesion that shows no associated hormonal hyper- or hyposecretion. Adrenal incidentaloma is also a typical mass detection of which is known to have increased with improved imaging techniques such as CT or MRI. We report a case in which a pituitary incidentaloma is accompanied by an adrenal incidentaloma. The 65-year-old patient was admitted due to oropharyngeal pain, and had a medical history that included an operation for rectal cancer. The adrenal tumor had no function, but left adrenalectomy was performed for the evaluation of rectal cancer recurrence, which was diagnosed pathologically as a benign adrenocortical nodule. In our experience we have found that, in the case of multiple incidentalomas, it is important to evaluate the function or malignancy status of each.

A Case of Acute Perithyroiditis with Transient Thyrotoxicosis in Childhood.: Soo Min Nam, Mi Yeong Lee, Jang Hyun Koh, Ki Joon Sung, Choon Hee Chung; J Korean Endocr Soc. 2006;21(2):142-145. Published online April 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.2.142

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Abstract PDF

Acute thyroiditis is a rare disease because of the sufficient supply of blood vessels and lymphatics in thyroid tissue, the high concentration of iodide in the thyroid tissue and the nearly completely isolated structure of the thyroid gland from the surrounding tissue via its capsule. The most common route of infection is from a pyriform sinus fistula and then the inflammation spreads from the sinus to the perithyroidal space. Computed tomography (CT) and magnetic resonance imaging (MRI) can show a low echogenic mass encircling thyroid gland and swelling of the perithyroidal tissue in acute suppurative thyroiditis. We experienced a case of acute perithyroiditis with thyrotoxicosis that developed in a 13-year old boy and he was diagnosed by the CT findings. The patient had complained of a low graded fever and neck swelling. The laboratory diagnosis and clinical course was like that of subacute thyroiditis, but the CT finding showed a show low echogenic mass encircling the thyroid glands and swelling of the perithyroidal tissue. Therefore, we diagnosed this patient with acute perithyroiditis. After treatment with antibiotics, he displayed clinical improvement and was discharged.

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A Case of Acute Suppurative Thyroiditis with Thyrotoxicosis in an Elderly Patient
Bo Sang Kim, Kil Woo Nam, Jeong Eun Kim, Ji Hoon Park, Jun Sik Yoon, Jung Hwan Park, Sang Mo Hong, Chang Bum Lee, Yong Soo Park, Woong Hwan Choi, You Hern Ahn, Dong Sun Kim
Endocrinology and Metabolism.2013; 28(1): 50. CrossRef
Acute Suppurative Thyroiditis Caused by Methicillin - ResistantStaphylococcus Aureusin Healthy Children
Soo hee Jee, Eun Young Kim
Journal of Korean Society of Pediatric Endocrinology.2011; 16(2): 128. CrossRef

A Case of Iodine-induced Thyrotoxicosis with Acromegaly.: Kwang Hyun Kim, Kyu Hong Kim, Ho Yoel Ryu, Su Min Nam, Mi Young Lee, Jang Hyun Koh, Jang Yeol Sin, Choon Hee Chung; J Korean Endocr Soc. 2006;21(1):63-67. Published online February 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.1.63

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Abstract PDF: Hyperthyroidism is seen in 3.5-26% of subjects with acromegaly. Hyperthyroidism can be developed by thyroid stimulating hormone (TSH) dependent mechanism in TSH-secreting adenomas with acromegaly or by TSH independent mechanism through the stimulation of thyroid cells by growth hormone (GH). So, confirming the cause of hyperthyroidism is important to treat that. We report a case of a 56-year-old man who had acromegaly with iodine-induced thyrotoxicosis. He took the sea tangle for 4 years because he had constipation. His face and hands indicated acromegaly. Thyroid function test showed that T3 and free T4 were increased and TSH was decreased. Ultrasonography of neck showed diffuse enlargement of thyroid gland and thyroid scan showed decreased uptake of thyroid gland. So we could confirm iodine-induced thyrotoxicosis due to excessive iodine intake. Serum GH and insulin-like growth factor (IGF)-1 were markedly increased and brain MRI showed heterogenous 1 cm sized pituitary mass in right side. Acromegaly was confirmed by brain MRI, pituitary stimulation test and increased level of GH, IGF-1. He stopped iodine intake. After 6 months, T3, free T4 and TSH were normalized and he is waiting for the surgical removal of pituitary adenoma.

A Case of Adrenocortical Adenoma Causing Subclinical Cushing's Syndrome Mistaken for Liddle's Syndrome.: Kyu Hong Kim, Kwang Hyun Kim, Ho Yoel Ryu, Soo Min Nam, Mi Young Lee, Jang Hyun Koh, Jang Yel Shin, Soon Hee Jung, Choon Hee Chung; J Korean Endocr Soc. 2006;21(1):58-62. Published online February 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.1.58

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Abstract PDF

Subclinical Cushing's syndrome is defined as an autonomous cortisol hyperproduction without specific clinical signs of cortisol excess, but detectable biochemically as derangements of the hypothalamic-pituitary-adrenal axis function. We report a case of a 33-year-old woman with subclinical Cushing's syndrome caused by left adrenocortical adenoma, mistaken for Liddle's syndrome. The patient complained of fatigue. Laboratory findings showed metabolic alkalosis, hypokalemia, high TTKG (transtubular K concentration gradient), low plasma renin activity, and low serum aldosterone level, that findings implied as Liddle's syndrome. So we performed further study. Hormonal and radiologic studies revealed subclinical Cushing's syndrome with a left adrenal mass. The adrenal mass was resected and pathologically diagnosed as adrenocortical adenoma. After the resection of the left adrenal mass, patient's hormonal levels showed normal range.

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Missed Ipsilateral Adrenal Adenoma With Recurrent Hypercortisolism After Prior Left Adrenalectomy
Jihoon Kim, Hae Kyung Kim, Choon Hee Chung
Journal of Korean Medical Science.2022;[Epub] CrossRef

The Effect of Hormone Replacement Therapy on Carotid Intima-Media Thickness in Healthy Postmenopausal Women.: Jang Yel Shin, Bong Soo Cha, Choon Hee Chung, Won Heum Shim, Hyun Chul Lee; J Korean Endocr Soc. 2006;21(1):14-21. Published online February 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.1.14

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Abstract PDF: BACKGROUND
Cardiovascular disease is the leading cause of death in postmenopausal women. The use of hormone replacement therapy (HRT) preventing for cardiovascular disease in postmenopausal women remains controversial. We investigated the effect of HRT on carotid intima-media thickness (IMT) according to the HRT duration in healthy postmenopausal women. METHODS: One hundred and twenty postmenopausal women (mean age: 55.4 +/- 3.3 years) were classified into never users, short-term, and long-term users according to the HRT duration. Carotid IMT was measured, and the clinical and biochemical cardiovascular risk factors were examined. RESULTS: The mean IMT was significantly thinner in the long-term users than that in the never users (0.62 +/- 0.11 vs. 0.71 +/- 0.14 mm, P < 0.01). Also, the maximal IMT was significantly thinner in the short-term and the long-term users. However, there is no significant difference in the mean and maximal IMTs between the estrogen alone and estrogen plus progestins used group. The period exposed to menopause was significantly shorter in the long-term users than that in the never users (1.8 +/- 2.3 vs. 4.3 +/- 3.3 years, P < 0.001). CONCLUSION: Our findings suggest that if HRT is initiated during early postmenopausal period before the onset of atherosclerosis, HRT may have a beneficial effect on the prevention of carotid atherosclerosis.

A Case of Drug Induced Nephrogenic Diabetes Insipidus and Hyperprolactinemia in Schizophrenia Simultaneously.: Ho Yoel Ryu, Mi Young Lee, Yeon Lee, Jang Hyun Koh, Mi Jin Kim, Young Goo Shin, Choon Hee Chung; J Korean Endocr Soc. 2005;20(4):407-412. Published online August 1, 2005; DOI: https://doi.org/10.3803/jkes.2005.20.4.407

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Abstract PDF: In schizophrenia, when treatment using antipsychotics fails, lithium, which is known as an antimanic drug, can also be administered. It is reported that 12~20% of patients taking lithium develop nephrogenic diabetes lactotrophs. Hyperprolactinemia is induced by typical antipsychotics, as they block the dopamine-2 receptors of latotrophs in the pituitary gland. Therefore, atypical antipsychotics for decreasing the side effect, such as hyperprolactinemia, can be used. However, hyperprolactinemia can be induced by risperidone, one of the atypical antipsychotics. Here, a case of drug induced nephrogenic diabetes insipidus and simultaneous hyperprolactinemia, which occurred in a patient with schizophrenia, is reported.

A Case of Pseudopseudohypoparathyroidism with Partial Empty Sella.: Jang Hyun Koh, Yeon Lee, Joung Wook Choi, Tae Won Hong, Mi Jin Kim, Young Goo Shin, Choon Hee Chung; J Korean Endocr Soc. 2004;19(4):433-438. Published online August 1, 2004

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Abstract PDF: Pseudohypoparathyroidism (PHP) is a rare endocrine syndrome, which is characterized by Albright's hereditary osteodystrophy (AHO). Pseudopseudohypoparathyroidism (PPHP) presents with AHO features, but does not show clinical symptoms or the same laboratory finding as hypoparathyroidism. A 54 aged woman visited our department with lower abdominal pain. She had a history of a total hysterectomy due to persistent uterine bleeding 30 years previously. She showed abnormal physical findings, including a round face, short stature and brachydactyly. Her hormonal data were within normal limits, as follows: PTH 40.72 pg/mL, calcium 8.6 mg/dL, phosphorus 4.0 mg/dL and 24 hour urine cAMP 3.2 nmol/mg. On a pituitary challenge test, the basal levels and response rates of FSH and LH were low, and a sella CT scan showed partially empty sella. Herein is reported a case of PPHP, with partial empty sella, with a review of the literature

Fos Expression Induced by Combined Injection of Leptin and Cholecystokinin in the Rat Brain.: Young Uck Kim, Kyung Suk You, Ho Suck Kang, Choon Hee Chung, Tae Sun Hwang; J Korean Endocr Soc. 2002;17(4):486-500. Published online August 1, 2002

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Abstract PDF: BACKGROUND
Several studies have reported that cholecystokinin (CCK), a short-term meal related satiety signal, and leptin, long-term signal for controlling feeding behaviour and body weight, act synergistically to inhibit food intake. However the mechanism and neuroanatomical basis for this response remain unclear. To clarify the neuronal mechanisms underlying the synergistic interaction between leptin and CCK, we examined the neuron activated by single or combined injection of leptin and CCK in fasted rats using immunohistochemistry for Fos. The expression of Fos can be used to trace neuronal activation pathways. METHODS: The rats were divided into 4 groups; Tris solution-saline, Tris solution-CCK, leptin-saline, leptin-CCK. Rats were received a single intracerebroventricular injection of either 3mul Tris solution or 3microgram leptin, and a single intraperitoneal injection of either 2mul saline or 2microgram/kg sulfated CCK-8. The changes of the Fos expression were investigated in the paraventricular nucleus (Pa), retrochiasmatic area (RCh), lateral hypothalamic nucleus (LH), central nucleus of amygdala(Ce), supraoptic nucleus (SO), arcuate nucleus (Arc), ventromedial hypothalamic nucleus(VMH),dorsomedial hypothalamic nucleus (DM), ventral premammillary nucleus (PMV), superior lateral subdivision of parabrachial nucleus (LPBS), external lateral subdivision of parabrachial nucleus (LPBE), supragenual nucleus (SGe), area postrema (AP), medial area (SolM) and commissural area (SolC) of nucleus of the solitary tract nuclei. RESULTS: CCK increased the Fos expression in the Pa, RCh, LH, Ce, SO, Arc, VMH, DM, PMV, LPBS, LPBE and SolM. Leptin increased the Fos expression in the Pa, RCh, LH, SO, Arc, VMH, DM, PMV, LPBS, LPBE, SGe, AP and SolM. Injections of leptin and CCK significantly enhanced the Fos expression in the Pa, RCh, VMH, DM, LPBS, and SolM compared with those induced by leptin or CCK alone. CONCLUSION: Our results suggest that the Pa, RCh, VMH, DM, LPBS and SolM may be essential sites mediating the synergistic effect of leptin and CCK to regulate food intake.

A Case of 46 XX Male Syndrome.: Jae Myoung Lee, Myung Sook Shim, Young Uck Kim, Young Goo Shin, Choon Hee Chung; J Korean Endocr Soc. 2001;16(1):148-152. Published online February 1, 2001

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Abstract PDF: The 46, XX male syndrome is rare disease that is characterized by a phenotypic male who has a 46, XX female karyotype. Since the first report by de la Chapelle and associates in 1964, several cases have been reported, but it is still a rare entity. Recently we examined a 20-year-old XX male who had the symptoms of gynecomastia, an infantile appearance of the external genitalia, scanty pubic hair, no Adams apple, and no axillary hair. We presently describe a patient with the 46, XX male syndrome who showed a 46, XX karyotype on chromosomal study and review the literatures.

A Case of Multiple Endocrine Neoplasia Neoplasia Type IIa Complicated by Acute Myocardial Infarction.: Eung Ho Karl, Mi Duck Lee, Young Uck Kim, Young Goo Shin, Jung Han Yoon, Seong Joon Kang, Choon Hee Chung; J Korean Endocr Soc. 1999;14(1):189-196. Published online January 1, 2001

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Abstract PDF: MEN IIa is the rare disorder consisted of thyroid medullary carcinoma, pheochromocytoma, and hyperparathyroidism. We experienced the case in which 42 year-old male patient with thyroid medullary carcinoma and pheochromocytoma complicated by acute myocardial infarction. During the process of conventional treatment of acute myocardial infarction, paroxysmal hypertension occurred for several times. We sought for the cause of paroxysmal hypertension, and found pheochromocytoma by the radiologic imaging study and the biochemical study and we found the 4X4 cm sized neck mass by palpation. After stabilizing his blood pressure by the use of phenoxybenzamine, we removed the pheochromocytoma in right adrenal gland and the medullary thyroid cancer, by right adrenalectomy and total thyroidectomy respectively. Thereafter, his subjective symptoms and objective signs were improved. We report the case with review of literatures.

A Case of X-linked Agammaglobulinemia with Delayed Growth.: Mi Jin Kim, Ho Young Kim, Mi Deok Lee, Hong Seung Kim, Young Goo Shin, Choon Hee Chung, Kye Chul Shin; J Korean Endocr Soc. 1999;14(1):153-159. Published online January 1, 2001

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Abstract PDF: In 1980, the clinical syndrome of X-linked agammaglobulinemia and isolated growth hormone defieiency (XLA/IGHD) was first described by Fleisher. We report here 25-year old man with isolated growth hormone deficiency and X-linked agammaglobulinemia. His height was below the third percentile. He had recurrent sinopulmonary infection, lacked circulating B lympocytes and had deficient growth hormone.

Clinical Characteristics in Korean Patients with Insulin Receptor Antibody Positive Acanthosis Nigricans.: Hong Seung Kim, Choon Hee Chung, Young Goo Shin, Mi Duk Lee, Young Joon Won; J Korean Endocr Soc. 1998;13(3):410-416. Published online January 1, 2001

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Abstract PDF: BACKGROUND
Insulin resistance syndrome shows extreme insulin resistance and is associated with acanthosis nigricans. We can differentiate it into type A insulin resistance that has insulin receptor defect, and type B insulin resistance due to insulin receptor autoantibody. Type B insulin resistance was firstly described by Kahn in 1976. It was often found in adult female and showed autoimmune characteristics. As clinical characteristics, there are hyperglycemia, hypoglycemia, hyperinsulinemia, extreme insulin resistance and acanthosis nigricans. METHODS: We investigated 17 insulin receptor autoantibody positive cases and 8 cases of normal control who had visited Wonju Christian Hospital from October 1994 to December 1995. Among insulin receptor autoantibody positive subject, male was 4 cases and female 13 cases. Their mean age was 42.2. We compared patients who had insulin receptor antibody positive acanthosis nigricans(IRA) with normal controls. IRA patients were 6 cases(35.3%) of nomal glucose tolerance, 11 cases(64.7%) of abnormal glucose tolerance including overt diabetes mellitus. RESULTS: The 11 cases(64.7%) among IRA patrents were obese and 13 cases(76.5%) had hyperininsulinemia. In IRA patients, mean serum insulin concentration during oral glucose tolerance test was 202.1mU/mL and it was greater than 46.3 of normal controls. Insulin sensitivity in 1.79mg/L * mM * xmU * min normal controls was higher than 0.74mg/L * mM * min of IRA patients. CONCLUSION: IRA patients showed abnormal glucose tolerance including overt diabetes millitus, severe insulin resistance, hyperinsulinemia and obesity.

A Case of Polygrandular Automune type II syndrome associated empty sella.: Jin Soo Kim, Mi Duk Lee, Hong Seung Kim, Choon Hee Chung; J Korean Endocr Soc. 1998;13(2):295-300. Published online January 1, 2001

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Abstract PDF: The polyglandular autoimmune(PGA) syndrome designate as the dysfimction of endocrine and nonendocrine systems involving two or more organs on the basis of an autoimmune mechanism. There are 3 types of PGA syndrome and their etiology or pathogenesis is still not complete by understood. Type I PGA is present in the patients who have at least two of the triad of Addison's disease, hypopacathyroidism, and chronic mucocutaneous candidiasis. Type II PGA is present in the those who have Addisons disease with autoimmune thyroid disease and/or insulin dependent diabetes mellitus, but who do not have hypoparathyroidism or candidiasis. Type III PGA is present in the one who have autoimmune thyroid disease, without Addisons disease, but with another autoimmune disease report a case of autoimmune polyglandular syndrome type II in a seventy-three years old female patient who had primary adrenal insufficiency, primary hypothyroidism, and empty sella, pulmonary tuberculosis.

A Case of Adrenocortical Carcinoma with Remarkably High Concentrations of 11-dexycortisol.: Hong Seung Kim, Choon Hee Chung, Mee Yeon Cho, Mi Duk Lee, Young Wook Kim, Yun Mi Kim; J Korean Endocr Soc. 1998;13(2):271-279. Published online January 1, 2001

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Abstract PDF: The adrenocartical carcinoma is a rare tumor with an estimated incidence of 1 case per 1,700,000 population. Despite its rarity, a large number of investigators have studied this neoplasm for the following two reasons. The First is the occasional difficulty of differentiation between careinoma and adenoma at the time of initial surgery, even by histopathologic examination. The other is its unique feature of corticosteroidogenesis. Steroid metabolism of adrenocortieal carcinoma is characterized by its low efficiency of steroid production due to deficiency of steroidogenic enzyme. The deficieney of 11 B-hydroxylase has been indieated in case of adrenoeortical carcinoma by several investigators. In this study, the serum level of cortisol was within normal range, but the serum level of 11-deoxycortisol was 50 times higher than normal. After the removal of tumor, the serum level of ll-deoxycortisol was markedly decm. In conclusion, the results from the this case suggest that measurement of serum 11-deoxy- cortisol may be a useful tool in the diagnosis and follow-up of adrenocortical carcinoma.

Two Cases of Aplastic Anemia Following Propylthiouracil.: Hong Seung Kim, Choon Hee Chung, Hee Sun Kim, Mi Duk Lee, Young Hak Shim, Soon Won Hong; J Korean Endocr Soc. 1998;13(2):258-263. Published online January 1, 2001

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Abstract PDF: Aplastic anemia is characterized by a failure of blood cell production resulting in varying degrees of pancytopenia with a markedly hypocellular bone marrow. Most cases of aplastic anemia are acquired, but the disease may also occur as the result of inherited abnormalities. In 50-65% of cases, however, the etiology is unknown. For acquired forms of aplastic anemia, a variety of causative factors, including radiation, viruses, chemicals and drugs, have been implicated. Antithyroid drugs(Carbimazole, Methimazole, Propylthiouracil) are usually listed among agents associated with the development of agranulocytosis, but aplastic anemia rarely follows their use. The first case of aplastic anemia followmg propylthiouracil was reported by Marte~lo et al. in 1967 and the second case was by Aksoy and Erdem in 1968. Recently, we experienced two cases of aplastic anemia following propylthiouracil therapy due to Graves disease, so we report here these cases with literature review.

Two Cases of Cushing's Disease Due to Large Pituitary ACTH Secreting Tumor.: Hong Seung Kim, Choon Hee Chung, Mee Yeon Cho, Young Goo Shin, Il Hoe Kim, Seok Woo Yang, Jang Young Kim; J Korean Endocr Soc. 1998;13(1):83-93. Published online January 1, 2001

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Abstract PDF: Cushing's syndrome that is caused by an adenoma of the corticotrape cells of the anterior pituitay or, rarely, by couticotrope hyperplasia is refered to as Cushing's disease. Cushings disease is usually characterized by chronic, moderate hypersecretion of ACTH and other POMC derived peptide. Most patients have ACTH-secreting anterior pituitary corticotrope microadenomas, but a small minority have a pituitary macroadenoma. We recently experenced two cases of Cushings disease due to pituitary macroadenoma. and report this cases with review of literatures.

A Case of Pituitary Metastasis of Lung Presenting as Diabetes Insipidus.: Hong Seung Kim, Choon Hee Chung, Mee Yeon Cho, Yun Mi Kim, Kye Chul Shin, Do Hoon Kim, Kwang Sun Song; J Korean Endocr Soc. 1997;12(4):602-608. Published online January 1, 2001

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Abstract PDF: This is a case report of a 61 years old man with suprasellar and pituitary metastasis from bronchogenic adenocarcinoma who developed polyuria and polydipsia. The clinical diagnosis has been made by bronchoscopy with washing cytology, biopsy of cervical lymph node, and brain MRI scan. Brain MRI scan showed metastatic tumor in the suprasellar area and pituitary gland with invasion of pituitary stalk. Light microscopic findings revealed adenocarcinoma in bronchoscopic washing cytology, and metastatic adenocarcinoma in the cervical lymph node. The combined pituitary stimulation test showed decreased reserve capacity of anterior pituitary hormones. And the water deprivation test also showed complete central diabetes inspidus. We report a case of suprasellar and pituitary metastasis from bronchogenic adenocarcinoma with a review of the literature.

A Case of Piouitary Hyperplasia with Retardation due to Primary Hypothyroidism.: Hong Seung Kim, Choon Hee Chung, Young Goo Shin, Bong Ki Lee; J Korean Endocr Soc. 1997;12(4):589-595. Published online January 1, 2001

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Abstract PDF: Primary hypothyroidism can result in reactive enlargement of the pituitary gland which is indistinguishable from primary pituitary lesions in clinical presentation and on magnetic resonance imaging. A 17-year-old girl came to the hospital due to short stature, general weakness and galac-torrhea. The magnetic resonance imaging (MRI) study showed pitutary enlargement. The hormone study showed hyperprolactinemia, decreased basal growth hormone level and primary hypothyroi-dism. By thyroid replacement therapy only, mass was successfully regressed on follow up MRI after 4 months, and growth acceleration could be achieved.

Two Cases of Graves Disease Associated The Empty Sella Syndrome.: Yeun Jong Choi, Hong Seung Kim, Eui Ryun Park, Young Gu Shin, Choon Hee Chung; J Korean Endocr Soc. 1996;11(4):517-522. Published online November 7, 2019

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Abstract PDF: The empty sella syndrome is characterized by obesity, frequent pregnancy, headache and high blood pressure, but its exact cause remains unknown. Usually the incomplete diaphragmatic sella has been considered as the cause of the empty sella syndrome, but some authors recently have suggested that the antipituitary antibody way be related to development of pituitary atrophy and the pituitary empty sella syndrome, and thus it may be clinically useful as screening test for the empty sella syndrome. We experienced two empty sella syndromes associated Graves disease and applied the antipituitary antibody as the diagnostic tool of the empty sella syndrome. But none of this two patients had antipituitary antibody and we report these cases with reviews of literatures.

A Case of Calcitonin Secreting Pheochromocytoma.: Joo Won Byun, Young Goo Shin, Choon Hee Chung, Young Jun Won, Yoon Jong Choi, Eui Ryun Park, Mi Duck Lee, Chang Ho Song, Mi Youn Cho, Sung Jun Kang; J Korean Endocr Soc. 1996;11(3):343-347. Published online November 7, 2019

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Abstract PDF: Pheochromocytoma is a catecholamine producing turnor and raise with less than 0.1% of hypertensive patients. It is developed, most commonly, in sporadic pheochromocytoma or multiple endocrine neoplasia type 2. Therefore, when hypercalcitoninemia is found in a patient with pheochromocytoma, the possibility of multiple endocrine neoplasia type 2 or the ectopic secretion of calcitonin must be considered. Recently we experienced a 45 year old male patient with sporadic pheochrornocytoma. He also had hypercalcitoninemia and normocalcemia. After the removal of pheochromocytoma, serum calcitnnin level returned to normal. Secretion of calcitonin was confirmed by immunohisto- chemical stain.

A Case of Autoimmune Hypoglycemia Due to Insulin Receptor Antibody Associated with Empty Sella Syndrome.: Hong Seung Kim, Young Jun Won, Hyung Jun Lee, Yoon Jong Choi, Do Sik Yoon, Young Goo Shin, Choon Hee Chung; J Korean Endocr Soc. 1996;11(1):119-123. Published online November 7, 2019

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Abstract PDF: No abstract available.

A Case of Turner Syndrome Associated with Autoimmune Thyroiditis and Empty Sella.: Hong Seung Kim, Joo Won Byun, Do Sik Yoon, Byung Gi Seo, Young Goo Shin, Choon Hee Chung; J Korean Endocr Soc. 1996;11(1):114-118. Published online November 7, 2019

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Abstract PDF: No abstract available.

Tuberculosis of the Thyroid Gland.: Chang Ho Song, Choon Hee Chung, Young Joon Weon, Mi Deok Lee, Seong Jin Park, Won Sik Lee, Mee Yon Cho, Young Kyung Kim, Seung Min Kim, Seong Joon Kang; J Korean Endocr Soc. 1995;10(4):428-433. Published online November 7, 2019

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Abstract PDF: Tuberculosis the thyroid gland occurs only rarely and a few records are available in Korea, despite of high prevalence of tuberculosis. The authors experienced a case of young woman with tuberculosis of the thyroid gland and meninges. Tuberculosis of the thyroid gland was confirmed by demonstration of acid-fast bacilli and granuloma with caseation necrosis on surgical specimen. Description of case profile and a brief review of literature are made.

A Case of Thyrotoxic Hypokalemic Periodic Paralysis Presenting as Cardiac Arrest.: Chang Ho Song, Choon Hee Chung, Young Joon Weon, Mi Deok Lee, Seong Jin Park, Young Goo Shin, Won Sik Lee; J Korean Endocr Soc. 1995;10(4):424-427. Published online November 7, 2019

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Abstract PDF: Periodic paralysis associated with thyrotoxicosis is characterized by intermittent flaccid paralysis of the skeletal muscle. The paralysis usually involve the skeletal muscle of the limbs, especially lower extrimities. In general, sensory function is intact. Involvement of respiratory, ocular or bulbar muscles is very rare, but bulbar and respiratoy invelvement may prove fatal. It is very rare a case that has severe clinical manifestation such as cardiac arrest. We report a case of thyrotoxic hypokalemic periodic paralysis presenting as cardiac arrest.

Atrial Fibrillation in Patients with Hyperthyroidism.: Ju Yong Lee, Chang Ho Song, Byeung Su Yu, Choon Hee Chung, Yoon Sok Chung, Hyeon Man Kim; J Korean Endocr Soc. 1995;10(1):52-57. Published online November 6, 2019

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Abstract PDF: Hyperthyroidism is a well known cause of atrial fibrillation. It is also known that control of hyperthyroidism can usually curb thyrotoxic atrial fibrillation and restore sinus rhythm. In this study, 282 patients with hyperthyroidism were investigated to quantify the incidence of atrial fibrillation, and to identify the vulnerable groups. In addition, we compared two groups of subjects with atrial fibrillation-one group with hyperthyroidism and the other group without - to study their reversion rate to sinus rhythm. Lastly, we investigated the factors affecting reversion to sinus rhythm in patients with thyrotoxic atrial fibrillation.The results were follows;1) Among 282 patients with hyperthyroidism, 35 cases(12.4%) had atrial fibrillation. Atrial fibrillations were more prevalent among male patient(19.4%) and elderly patients(42.9%) than female patients(10.0%) and young patients(10.0%).2) Reversion to normal sinus rhythm in patients with thyrotoxic atrial fibrillation(39.3%) was significantly higher than that in patients without hyperthyroidism(17.4%, p<0.001).3) Reversion to normal sinus rhythm was achieved within 28 weeks from the beginnig of antithyroid treatment in patients with thyrotoxic atrial fibrillation. Although there were no significant differences in mean age, sex ratio, and initial and follow-up thyroid hormone levels between the reversion group and non-reversion group, associated heart diseases were more prevalent in the latter group(18.2% vs. 47.1%).It can be concluded that thyrotoxic atrial fibrillations were more common in male patient and elderly patient groups, and could be frequently reverted to normal sinus rhythm by antithyroid treatment. We also suggest that the duration of artrial fibrillation(from intial onset of the condition), and associated heart diseases, may be important predictive factors for the reversion of atrial fibrillation in patients with hyperthyroidism.

A Case of Thyrotoxic Hypokalemic Periodic Paralysis Presenting as Cardiac Arrest.: Chang Ho Song, Choon Hee Chung, Young Goo Shin, Young Joon Weon, Mi Deok Lee, Seong Jin Park; J Korean Endocr Soc. 1994;10(2):175-178. Published online November 6, 2019

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Abstract PDF: No abstract available.

Seasonal Variation in Serum 25-Hydroxyvitamin D in The Elderly in Korean.: Eun Jig Lee, Kyung Rae Kim, Young Duk Song, Hyun Chul Lee, Kap Bum Huh, Choon Hee Chung, Sung Kil Lim, Yoon Sok Chung; J Korean Endocr Soc. 1994;9(2):121-127. Published online November 6, 2019

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Abstract PDF: The seasonal variations in the parameters of calcium metabolism including 25-hydroxyvitamin D were analyzed in 19 free-living elderly subjects (mean age:68.7±6.7 yr) in Seoul. Mean serum total calcium concentration was 9.0±0.3 mg/dl in March and had risen to 9.3±0.3mg/dl in the following September(p<0.001). Despite their comparable calcium intake. Serum phosphorus and alkaline phosphatase concentrations did not show any seasonal variations, whereas serum PTH concentrations were significantly lower in September than in March(20.1±8.6 vs. 32.5±8.4 pg/ml, p<0.001). Seasonal changes in serum 25-hydroxyvitamin D concentrations were also found between the value(17.3±6.9 ng/ml) in March and that (28.5±7.4 ng/ml) in September(p<0.001). There was a significant correlation between seasonal increase in 25-hydroxyvitamin D and seasonal reduction in serum PTH/Cr(r=-0.5394, p<0.05). This study suggests that the winter minimum of serum 25-hydroxyvitamin D concentration and the elevated PTH may be a contributing risk factor for the development of osteopenia especially in the elderly individuals. When exposure to sunlight is reduced, as in the case of nursing home population, an additional exogenous form of the vitamin D may be advisable.

The effect of body fat on bone density in pre-and postmenopausal women.: Young Duk Song, Sung Kil Lim, Yoon Sok Chung, Seog Won Park, Choon Hee Chung, Kwang Jin Ahn, Eun Jig Lee, Hyun Chul Lee, Kap Bum Huh, Mi Sook Choi, In Kyung Paik, Jong Ho Lee; J Korean Endocr Soc. 1993;8(3):251-258. Published online January 1, 2001

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Abstract PDF: No abstract available.

Gonadotropin-releasing hormone(GnRH) therapy in male patients with hypothalamic hypogonadism.: Seog Won Park, Yoon Sok Chung, Choon Hee Chung, Sung Eun Kim, Eun Jig Lee, Hyun Chul Lee, Kap Bum Huh, Hyung Ki Choi, Moo Sang Lee, Ki Hyun Park; J Korean Endocr Soc. 1993;8(1):27-34. Published online January 1, 2001

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Abstract PDF: No abstract available.

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