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Athanasios D Anastasilakis Department of Endocrinology, 424 General Military Hospital, Thessaloniki, Greece

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Marina Tsoli 1st Propaedeutic Department of Internal Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Gregory Kaltsas 1st Propaedeutic Department of Internal Medicine, National and Kapodistrian University of Athens, Athens, Greece

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Polyzois Makras Department of Endocrinology and Diabetes, 251 Hellenic Air Force & VA General Hospital, Athens, Greece

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Langerhans cell histiocytosis (LCH) is a rare disease of not well-defined etiology that involves immune cell activation and frequently affects the skeleton. Bone involvement in LCH usually presents in the form of osteolytic lesions along with low bone mineral density. Various molecules involved in bone metabolism are implicated in the pathogenesis of LCH or may be affected during the course of the disease, including interleukins (ILs), tumor necrosis factor α, receptor activator of NF-κB (RANK) and its soluble ligand RANKL, osteoprotegerin (OPG), periostin and sclerostin. Among them IL-17A, periostin and RANKL have been proposed as potential serum biomarkers for LCH, particularly as the interaction between RANK, RANKL and OPG not only regulates bone homeostasis through its effects on the osteoclasts but also affects the activation and survival of immune cells. Significant changes in circulating and lesional RANKL levels have been observed in LCH patients irrespective of bone involvement. Standard LCH management includes local or systematic administration of corticosteroids and chemotherapy. Given the implication of RANK, RANKL and OPG in the pathogenesis of the disease and the osteolytic nature of bone lesions, agents aiming at inhibiting the RANKL pathway and/or osteoclastic activation, such as bisphosphonates and denosumab, may have a role in the therapeutic approach of LCH although further clinical investigation is warranted.

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Cristina Lamas Department of Endocrinology and Nutrition, Complejo Hospitalario Universitario de Albacete, Albacete, Spain

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Elena Navarro Department of Endocrinology and Nutrition, Hospital Universitario Virgen del Rocío, Sevilla, Spain

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Anna Casterás Department of Endocrinology and Nutrition, Hospital Vall d’Hebron, Barcelona, Spain

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Paloma Portillo Department of Endocrinology and Nutrition, Hospital Clínico Universitario Virgen de la Arrixaca, Murcia, Spain

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Victoria Alcázar Department of Endocrinology and Nutrition, Hospital Universitario Severo Ochoa, Leganés, Spain

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María Calatayud Department of Endocrinology and Nutrition, Hospital Univeristario Doce de Octubre, Madrid, Spain

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Cristina Álvarez-Escolá Department of Endocrinology and Nutrition, Hospital Universitario La Paz, Madrid, Spain

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Julia Sastre Department of Endocrinology and Nutrition, Complejo Hospitalario de Toledo, Hospital Virgen de la Salud, Toledo, Spain

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Evangelina Boix Department of Endocrinology and Nutrition, Hospital General Universitario de Elche, Elche, Spain

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Lluis Forga Department of Endocrinology and Nutrition, Complejo Hospitalario de Navarra, Hospital de Navarra, Pamplona, Spain

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Almudena Vicente Department of Endocrinology and Nutrition, Complejo Hospitalario de Toledo, Hospital Virgen de la Salud, Toledo, Spain

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Josep Oriola Biochemistry and Molecular Genetics Department, Hospital Clínic i Universitari de Barcelona, Barcelona, Spain

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Jordi Mesa Department of Endocrinology and Nutrition, Hospital Vall d’Hebron, Barcelona, Spain

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Nuria Valdés Department of Endocrinology and Nutrition, Hospital Universitario Central de Asturias, Oviedo, Spain

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Primary hyperparathyroidism is the most frequent manifestation of multiple endocrine neoplasia type 1 (MEN1) syndrome. Bone and renal complications are common. Surgery is the treatment of choice, but the best timing for surgery is controversial and predictors of persistence and recurrence are not well known. Our study describes the clinical characteristics and the surgical outcomes, after surgery and in the long term, of the patients with MEN1 and primary hyperparathyroidism included in the Spanish Registry of Multiple Endocrine Neoplasia, Pheochromocytomas and Paragangliomas (REGMEN). Eighty-nine patients (49 men and 40 women, 34.2 ± 13 years old) were included. Sixty-four out of the 89 underwent surgery: a total parathyroidectomy was done in 13 patients, a subtotal parathyroidectomy in 34 and a less than subtotal parathyroidectomy in 15. Remission rates were higher after a total or a subtotal parathyroidectomy than after a less than subtotal (3/4 and 20/22 vs 7/12, P < 0.05), without significant differences in permanent hypoparathyroidism (1/5, 9/23 and 0/11, N.S.). After a median follow-up of 111 months, 20 of the 41 operated patients with long-term follow-up had persistent or recurrent hyperparathyroidism. We did not find differences in disease-free survival rates between different techniques, patients with or without permanent hypoparathyroidism and patients with different mutated exons, but a second surgery was more frequent after a less than subtotal parathyroidectomy.

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Marília D’Elboux Guimarães Brescia Endocrine Genetics Unit (LIM-25), Endocrinology Division, University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina da Universidade de São Paulo (FMUSP), Hospital das Clinicas (HCFMUSP), São Paulo, São Paulo, Brazil
Parathyroid Unit – LIM-28, Laboratório de Cirurgia de Cabeça e Pescoço, Division of Head and Neck Surgery, Department of Surgery, Hospital das Clinicas (HCFMUSP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina, Universidade de São Paulo, São Paulo, São Paulo, Brazil

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Karine Candido Rodrigues Endocrine Genetics Unit (LIM-25), Endocrinology Division, University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina da Universidade de São Paulo (FMUSP), Hospital das Clinicas (HCFMUSP), São Paulo, São Paulo, Brazil
Endocrine Oncology Division, Institute of Cancer of the State of São Paulo (ICESP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, São Paulo, Brazil

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André Fernandes d’Alessandro Parathyroid Unit – LIM-28, Laboratório de Cirurgia de Cabeça e Pescoço, Division of Head and Neck Surgery, Department of Surgery, Hospital das Clinicas (HCFMUSP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina, Universidade de São Paulo, São Paulo, São Paulo, Brazil

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Wellington Alves Filho Department of Surgery, Walter Cantidio University Hospital, Federal University of Ceara School of Medicine (FAMED-UFC), Fortaleza, Brazil

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Willemijn Y van der Plas Department of Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

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Schelto Kruijff Department of Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands

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Sergio Samir Arap Parathyroid Unit – LIM-28, Laboratório de Cirurgia de Cabeça e Pescoço, Division of Head and Neck Surgery, Department of Surgery, Hospital das Clinicas (HCFMUSP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina, Universidade de São Paulo, São Paulo, São Paulo, Brazil

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Sergio Pereira de Almeida Toledo Endocrine Genetics Unit (LIM-25), Endocrinology Division, University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina da Universidade de São Paulo (FMUSP), Hospital das Clinicas (HCFMUSP), São Paulo, São Paulo, Brazil

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Fábio Luiz de Menezes Montenegro Parathyroid Unit – LIM-28, Laboratório de Cirurgia de Cabeça e Pescoço, Division of Head and Neck Surgery, Department of Surgery, Hospital das Clinicas (HCFMUSP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina, Universidade de São Paulo, São Paulo, São Paulo, Brazil

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Delmar Muniz Lourenço Jr Endocrine Genetics Unit (LIM-25), Endocrinology Division, University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina da Universidade de São Paulo (FMUSP), Hospital das Clinicas (HCFMUSP), São Paulo, São Paulo, Brazil
Endocrine Oncology Division, Institute of Cancer of the State of São Paulo (ICESP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, São Paulo, Brazil

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Background

Potential influences of parathyroidectomy (PTx) on the quality of life (QoL) in multiple endocrine neoplasia type 1-related primary hyperparathyroidism (HPT/MEN1) are unknown.

Method

Short Form 36 Health Survey Questionnaire was prospectively applied to 30 HPT/MEN1 patients submitted to PTx (20, subtotal; 10, total with autograft) before, 6 and 12 months after surgery. Parameters that were analyzed included QoL, age, HPT-related symptoms, general pain, comorbidities, biochemical/hormonal response, PTx type and parathyroid volume.

Results

Asymptomatic patients were younger (30 vs 38 years; P = 0.04) and presented higher QoL scores than symptomatic ones: Physical Component Summary score (PCS) 92.5 vs 61.2, P = 0.0051; Mental Component Summary score (MCS) 82.0 vs 56.0, P = 0.04. In both groups, QoL remained stable 1 year after PTx, independently of the number of comorbidities. Preoperative general pain was negatively correlated with PCS (r = −0.60, P = 0.0004) and MCS (r = −0.57, P = 0.0009). Also, moderate/intense pain was progressively (6/12 months) more frequent in cases developing hypoparathyroidism. The PTx type and hypoparathyroidism did not affect the QoL at 12 months although remnant parathyroid tissue volume did have a positive correlation (P = 0.0490; r = 0.3625) to PCS 12 months after surgery. Patients with one to two comorbidities had as pre-PTx PCS (P = 0.0015) as 12 months and post-PTx PCS (P = 0.0031) and MCS (P = 0.0365) better than patients with three to four comorbidities.

Conclusion

A variable QoL profile was underscored in HPT/MEN1 reflecting multiple factors associated with this complex disorder as comorbidities, advanced age at PTx and presence of preoperative symptoms or of general pain perception. Our data encourage the early indication of PTx in HPT/MEN1 by providing known metabolic benefits to target organs and avoiding potential negative impact on QoL.

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Huda M Elsharkasi Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK

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Suet C Chen Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK

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Lewis Steell Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK

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Shuko Joseph Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK
Paediatric Neurosciences Research Group, Royal Hospital for Children, NHS Greater Glasgow & Clyde, Glasgow, UK

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Naiemh Abdalrahaman Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK

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Christie McComb Department of Clinical Physics, NHS Greater Glasgow & Clyde, Glasgow, UK

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Blair Johnston Department of Clinical Physics, NHS Greater Glasgow & Clyde, Glasgow, UK

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John Foster Department of Clinical Physics, NHS Greater Glasgow & Clyde, Glasgow, UK

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Sze Choong Wong Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK

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S Faisal Ahmed Developmental Endocrinology Research Group, University of Glasgow, Glasgow, UK

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Objective

The aim of this study is to investigate the role of 3T-MRI in assessing musculoskeletal health in children and young people.

Design

Bone, muscle and bone marrow imaging was performed in 161 healthy participants with a median age of 15.0 years (range, 8.0, 30.0).

Methods

Detailed assessment of bone microarchitecture (constructive interference in the steady state (CISS) sequence, voxel size 0.2 × 0.2 × 0.4 mm3), bone geometry (T1-weighted turbo spin echo (TSE) sequence, voxel size 0.4 × 0.4 × 2 mm3) and bone marrow (1H-MRS, point resolved spectroscopy sequence (PRESS) (single voxel size 20 × 20 × 20 mm3) size and muscle adiposity (Dixon, voxel size 1.1 × 1.1 × 2 mm3).

Results

There was an inverse association of apparent bone volume/total volume (appBV/TV) with age (r = −0.5, P < 0.0005). Cortical area, endosteal and periosteal circumferences and muscle cross-sectional area showed a positive association to age (r > 0.49, P < 0.0001). In those over 17 years of age, these parameters were also higher in males than females (P < 0.05). This sex difference was also evident for appBV/TV and bone marrow adiposity (BMA) in the older participants (P < 0.05). AppBV/TV showed a negative correlation with BMA (r = −0.22, P =  0.01) which also showed an association with muscle adiposity (r = 0.24, P = 0.04). Cortical geometric parameters were highly correlated with muscle area (r > 0.57, P < 0.01).

Conclusions

In addition to providing deep insight into the normal relationships between bone, fat and muscle in young people, these novel data emphasize the role of MRI as a non-invasive method for performing a comprehensive and integrated assessment of musculoskeletal health in the growing skeleton.

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Julia Herteux Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Simon Johannes Geiger Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Christina Starchl Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Johanna Windisch Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Theresa Lerchl Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Adelina Tmava-Berisha Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Gerit Wünsch Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Kathrin Eller Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Astrid Fahrleitner-Pammer Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Karin Amrein Medical University of Graz, Auenbruggerplatz, Graz, Austria

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Objective

Chronic hypoparathyroidism (HP) is associated with acute and chronic complications, especially those related to hypocalcemia. We aimed to analyze details on hospital admissions and the reported deaths in affected patients.

Design and methods

In a retrospective analysis, we reviewed the medical history of 198 patients diagnosed with chronic HP over a continuous period of up to 17 years at the Medical University Graz.

Results

The mean age in our mostly female cohort (70.2%) was 62.6 ± 18.7 years. The etiology was predominantly postsurgical (84.8%). About 87.4% of patients received standard medication (oral calcium/vitamin D), 15 patients (7.6%) used rhPTH1–84/Natpar® and 10 patients (4.5%) had no/unknown medication. Two hundred and nineteen emergency room (ER) visits and 627 hospitalizations were documented among 149 patients, and 49 patients (24.7%) did not record any hospital admissions. According to symptoms and decreased serum calcium levels, 12% of ER (n = 26) visits and 7% of hospitalizations (n = 44) were likely attributable to HP. A subgroup of 13 patients (6.5%) received kidney transplants prior to the HP diagnosis. In eight of these patients, parathyroidectomy for tertiary renal hyperparathyroidism was the cause of permanent HP. The mortality was 7.8% (n = 12), and the causes of death appeared to be unrelated to HP. Although the awareness for HP was low, calcium levels were documented in 71% (n = 447) of hospitalizations.

Conclusions

Acute symptoms directly related to HP did not represent the primary cause of ER visits. However, comorbidities (e.g. renal/cardiovascular diseases) associated with HP played a key role in hospitalizations and deaths.

Significance statement

Hypoparathyroidism (HP) is the most common complication after anterior neck surgery. Yet, it remains underdiagnosed as well as undertreated, and the burden of disease and long-term complications are usually underestimated. There are few detailed data on emergency room (ER) visits hospitalizations and death in patients with chronic HP, although acute symptoms due to hypo-/hypercalcemia are easily detectable. We show that HP is not the primary cause for presentation but that hypocalcemia is a typical laboratory finding (when ordered) and thus may contribute to subjective symptoms. Patients often present with renal/cardiovascular/oncologic illness for which HP is known to be a contributing factor. A small but very special group (n = 13, 6.5%) are patients after kidney transplantations who showed a high ER hospitalization rate. Surprisingly, HP was never the cause for their frequent hospitalizations but rather the result of chronic kidney disease. The most frequent cause for HP in these patients was parathyroidectomy due to tertiary hyperparathyroidism. The causes of death in 12 patients appeared to be unrelated to HP, but we found a high prevalence of chronic organ damages/comorbidities related to it in this group. Less than 25% documented HP correctly in the discharge letters, which indicates a high potential for improvement.

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Sofya Gronskaia Endocrinology Research Centre, Moscow, Russia

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Galina Melnichenko Endocrinology Research Centre, Moscow, Russia

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Liudmila Rozhinskaya Endocrinology Research Centre, Moscow, Russia

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Tatiana Grebennikova Endocrinology Research Centre, Moscow, Russia

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Elizaveta Mamedova Endocrinology Research Centre, Moscow, Russia

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Ekaterina Pigarova Endocrinology Research Centre, Moscow, Russia

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Elena Przhialkovskaya Endocrinology Research Centre, Moscow, Russia

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Larisa Dzeranova Endocrinology Research Centre, Moscow, Russia

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Ivan Dedov Endocrinology Research Centre, Moscow, Russia

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Valentin Fadeyev I.M. Sechenov First Moscow State Medical University, Moscow, Russia

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Maria Luisa Brandi University of Florence, Surgery and Translational Medicine, Piereccaini, Firenze, Italy

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Zhanna Belaya Endocrinology Research Centre, Moscow, Russia

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Hypoparathyroidism and pseudohypoparathyroidism are rare endocrine disorders, characterized by low serum calcium due to inappropriate parathyroid hormone (PTH) levels or resistance to its action. There is little epidemiological information regarding chronic hypoparathyroidism in Russia. This study aims to build a registry database of Russian patients with chronic hypoparathyroidism who were referred for hospital treatment in order to conduct initial analysis of clinical presentations and hospital management. The Italian registry model was taken to be able to integrate our data in the future. Two hundred patients with hypoparathyroidism (n = 194) and pseudohypoparathyroidism (n = 6) were enrolled over 2 years (2017–2019). The most frequent cause of hypoparathyroidism was neck surgery (82.5%, mostly females), followed by idiopathic hypoparathyroidism (10%), syndromic forms of genetic hypoparathyroidism (4.5%) and forms of defective PTH action (3%). Calcium supplements and alfacalcidol were prescribed in most cases. However, a minority of patients (n = 6) needed to receive teriparatide as the only way to maintain calcium levels and to prevent symptoms of hypocalcemia. Consequently, substitution treatment with parathyroid hormone should be available in certain cases of hypoparathyroidism. This database will be useful to estimate the potential requirement for recombinant PTH in Russia and standards for clinical and therapeutic approaches.

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Leyre Lorente-Poch Endocrine Surgery Unit, Hospital del Mar, Barcelona, Spain
Departament de Cirurgia, Universitat Autònoma de Barcelona, Barcelona, Spain

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Sílvia Rifà-Terricabras Departament de Cirurgia, Universitat Autònoma de Barcelona, Barcelona, Spain

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Juan José Sancho Endocrine Surgery Unit, Hospital del Mar, Barcelona, Spain
Departament de Cirurgia, Universitat Autònoma de Barcelona, Barcelona, Spain

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Danilo Torselli-Valladares Endocrine Surgery Unit, Hospital del Mar, Barcelona, Spain

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Sofia González-Ortiz Department of Radiology, Hospital del Mar, Barcelona, Spain

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Antonio Sitges-Serra Endocrine Surgery Unit, Hospital del Mar, Barcelona, Spain
Departament de Cirurgia, Universitat Autònoma de Barcelona, Barcelona, Spain

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Objective:

Permanent hypoparathyroidism is an uncommon disease resulting most frequently from neck surgery. It has been associated with visceral calcifications but few studies have specifically this in patients with post-surgical hypoparathyroidism. The aim of the present study was to assess the prevalence of basal ganglia and carotid artery calcifications in patients with long-term post-thyroidectomy hypoparathyroidism compared with a control population.

Design:

Case–control study.

Methods:

A cross-sectional review comparing 29 consecutive patients with permanent postoperative hypoparathyroidism followed-up in a tertiary reference unit for Endocrine Surgery with a contemporary control group of 501 patients who had an emergency brain CT scan. Clinical variables and prevalence of basal ganglia and carotid artery calcifications were recorded.

Results:

From a cohort of 46 patients diagnosed with permanent hypoparathyroidism, 29 were included in the study. The mean duration of disease was 9.2 ± 7 years. Age, diabetes, hypertension, smoking and dyslipidemia were similarly distributed in case and control groups. The prevalence of carotid artery and basal ganglia calcifications was 4 and 20 times more frequent in patients with permanent hypoparathyroidism, respectively. After propensity score matching of the 28 the female patients, 68 controls were matched for age and presence of cardiovascular factors. Cases showed a four-fold prevalence of basal ganglia calcifications, whereas that of carotid calcifications was similar between cases and controls.

Conclusion:

A high prevalence of basal ganglia calcifications was observed in patients with post-surgical permanent hypoparathyroidism. It remains unclear whether carotid artery calcification may also be increased.

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Veronica Kieffer
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Kate Davies University Hospitals of Leicester NHS Trust, Great Ormond Street Hospital for Children NHS Trust, Central Manchester University Hospitals NHS Foundation Trust, NHS Grampian, Portsmouth Hospitals NHS Trust, Salford Royal Hospitals Foundation Trust, Heart of England NHS Foundation Trust, The London Clinic, Department of Diabetes and Endocrinology, Leicester Royal Infirmary, Leicester, LE1 5WW, UK

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Christine Gibson University Hospitals of Leicester NHS Trust, Great Ormond Street Hospital for Children NHS Trust, Central Manchester University Hospitals NHS Foundation Trust, NHS Grampian, Portsmouth Hospitals NHS Trust, Salford Royal Hospitals Foundation Trust, Heart of England NHS Foundation Trust, The London Clinic, Department of Diabetes and Endocrinology, Leicester Royal Infirmary, Leicester, LE1 5WW, UK

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Morag Middleton University Hospitals of Leicester NHS Trust, Great Ormond Street Hospital for Children NHS Trust, Central Manchester University Hospitals NHS Foundation Trust, NHS Grampian, Portsmouth Hospitals NHS Trust, Salford Royal Hospitals Foundation Trust, Heart of England NHS Foundation Trust, The London Clinic, Department of Diabetes and Endocrinology, Leicester Royal Infirmary, Leicester, LE1 5WW, UK

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Jean Munday University Hospitals of Leicester NHS Trust, Great Ormond Street Hospital for Children NHS Trust, Central Manchester University Hospitals NHS Foundation Trust, NHS Grampian, Portsmouth Hospitals NHS Trust, Salford Royal Hospitals Foundation Trust, Heart of England NHS Foundation Trust, The London Clinic, Department of Diabetes and Endocrinology, Leicester Royal Infirmary, Leicester, LE1 5WW, UK

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Shashana Shalet University Hospitals of Leicester NHS Trust, Great Ormond Street Hospital for Children NHS Trust, Central Manchester University Hospitals NHS Foundation Trust, NHS Grampian, Portsmouth Hospitals NHS Trust, Salford Royal Hospitals Foundation Trust, Heart of England NHS Foundation Trust, The London Clinic, Department of Diabetes and Endocrinology, Leicester Royal Infirmary, Leicester, LE1 5WW, UK

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Lisa Shepherd University Hospitals of Leicester NHS Trust, Great Ormond Street Hospital for Children NHS Trust, Central Manchester University Hospitals NHS Foundation Trust, NHS Grampian, Portsmouth Hospitals NHS Trust, Salford Royal Hospitals Foundation Trust, Heart of England NHS Foundation Trust, The London Clinic, Department of Diabetes and Endocrinology, Leicester Royal Infirmary, Leicester, LE1 5WW, UK

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Phillip Yeoh University Hospitals of Leicester NHS Trust, Great Ormond Street Hospital for Children NHS Trust, Central Manchester University Hospitals NHS Foundation Trust, NHS Grampian, Portsmouth Hospitals NHS Trust, Salford Royal Hospitals Foundation Trust, Heart of England NHS Foundation Trust, The London Clinic, Department of Diabetes and Endocrinology, Leicester Royal Infirmary, Leicester, LE1 5WW, UK

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This competency framework was developed by a working group of endocrine specialist nurses with the support of the Society for Endocrinology to enhance the clinical care that adults with an endocrine disorder receive. Nurses should be able to demonstrate that they are functioning at an optimal level in order for patients to receive appropriate care. By formulating a competency framework from which an adult endocrine nurse specialist can work, it is envisaged that their development as professional practitioners can be enhanced. This is the second edition of the Competency Framework for Adult Endocrine Nursing. It introduces four new competencies on benign adrenal tumours, hypo- and hyperparathyroidism, osteoporosis and polycystic ovary syndrome. The authors and the Society for Endocrinology welcome constructive feedback on the document, both nationally and internationally, in anticipation that further developments and ideas can be incorporated into future versions.

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Anna Gorbacheva Endocrinology Research Center, Moscow, Russian Federation

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Anna Eremkina Endocrinology Research Center, Moscow, Russian Federation

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Daria Goliusova Endocrinology Research Center, Moscow, Russian Federation

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Julia Krupinova Endocrinology Research Center, Moscow, Russian Federation

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Natalia Mokrysheva Endocrinology Research Center, Moscow, Russian Federation

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Multiple endocrine neoplasia type 1 (MEN1) is the most common cause of hereditary primary hyperparathyroidism (PHPT). Bone disorders are considered one of the key symptoms in PHPT present with the significant reduction in bone mineral density and low-energy fractures. Previously, these bone disorders were believed to be caused solely by the increase in the level of parathyroid hormone and its subsequent effect on bone resorption. The current paradigm, however, states that the mutations in the menin gene, which cause the development of MEN1, can also affect the metabolism of the cells of the osteoid lineage. This review analyzes both the proven and the potential intracellular mechanisms through which menin can affect bone metabolism.

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Rong Xu Center for Endocrine Metabolism and Immune Diseases, Lu He Hospital, Capital Medical University, Beijing, China
Beijing Key Laboratory of Diabetes Research and Care, Beijing, China

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Difei Lian Center for Endocrine Metabolism and Immune Diseases, Lu He Hospital, Capital Medical University, Beijing, China
Beijing Key Laboratory of Diabetes Research and Care, Beijing, China

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Yan Xie Center for Endocrine Metabolism and Immune Diseases, Lu He Hospital, Capital Medical University, Beijing, China
Beijing Key Laboratory of Diabetes Research and Care, Beijing, China

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Lin Mu Center for Endocrine Metabolism and Immune Diseases, Lu He Hospital, Capital Medical University, Beijing, China
Beijing Key Laboratory of Diabetes Research and Care, Beijing, China

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Yali Wu Center for Endocrine Metabolism and Immune Diseases, Lu He Hospital, Capital Medical University, Beijing, China
Beijing Key Laboratory of Diabetes Research and Care, Beijing, China

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Zhilei Chen Center for Endocrine Metabolism and Immune Diseases, Lu He Hospital, Capital Medical University, Beijing, China
Beijing Key Laboratory of Diabetes Research and Care, Beijing, China

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Baoyu Zhang Center for Endocrine Metabolism and Immune Diseases, Lu He Hospital, Capital Medical University, Beijing, China
Beijing Key Laboratory of Diabetes Research and Care, Beijing, China

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Osteoporosis (OP) is a systemic bone disease in which bone density and quality decrease and bone fragility increases due to a variety of causes, making it prone to fractures. The development of OP is closely related to oxidative stress. Uric acid (UA) is the end product of purine metabolism in the human body. Extracellular UA has antioxidant properties and is thought to have a protective effect on bone metabolism. However, the process of UA degradation can lead to intracellular oxidative stress, which together with UA-induced inflammatory factors, leads to increased bone destruction. In addition, UA can inhibit vitamin D production, resulting in secondary hyperparathyroidism and further exacerbating UA-associated bone loss. This review summarizes the relationship between serum UA levels and bone mineral density, bone turnover markers, and so on, in the hope of providing new insights into the pathogenesis and treatment of OP.

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