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Feifei Shao Department of Endocrinology, Gansu Provincial Hospital, Lanzhou, Gansu, China
Clinical Research Center for Metabolic Disease, Gansu Province, Lanzhou, Gansu, China
The First School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China

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Xinxin Hu Clinical Research Center for Metabolic Disease, Gansu Province, Lanzhou, Gansu, China
The First School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China

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Jiayu Li Clinical Research Center for Metabolic Disease, Gansu Province, Lanzhou, Gansu, China
The First School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China

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Bona Bai Clinical Research Center for Metabolic Disease, Gansu Province, Lanzhou, Gansu, China
The First School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China

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Limin Tian Department of Endocrinology, Gansu Provincial Hospital, Lanzhou, Gansu, China
Clinical Research Center for Metabolic Disease, Gansu Province, Lanzhou, Gansu, China
The First School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China

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Aims

Aging, obesity, and type 2 diabetes mellitus (T2DM) form a metabolic disease continuum that has a continuously increasing prevalence. Lipidomics explains the complex interactions between lipid metabolism and metabolic diseases. We aimed to systematically investigate the plasma lipidome changes induced by newly diagnosed impaired glucose tolerance (IGT) and T2DM in overweight/obese elderly individuals and to identify potential biomarkers to differentiate between the IGT, T2DM, and control groups.

Methods

Plasma samples from 148 overweight/obese elderly individuals, including 52 patients with IGT, 47 patients with T2DM, and 49 euglycemic controls, were analyzed using a high-coverage nontargeted absolute quantitative lipidomics approach.

Results

We quantified 1840 lipids from thirty-eight classes and seven lipid categories. Among overweight/obese elderly individuals, the lipidomic profiles of IGT and T2DM patients were significantly different from those of controls, while they were similar in the IGT and T2DM groups. The concentrations of diglycerides, triglycerides, phosphatidylcholines, and ceramides were obviously altered in the IGT and T2DM groups. Particularly, IGT and T2DM induced the accumulation of triglycerides with longer carbon atom numbers (C44–50) and saturated or lower double bond numbers (n (C=C) = 0–2). Furthermore, a total of 17 potential lipidic biomarkers were identified to successfully differentiate between the IGT, T2DM, and control groups.

Conclusions

In overweight/obese elderly patients, IGT and T2DM induced apparent lipidome-wide changes. This study’s results may contribute to explaining the complex dysfunctional lipid metabolism in aging, obesity, and diabetes.

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Stefan M Constantinescu Department of Endocrinology and Nutrition, Cliniques Universitaires Saint-Luc, Brussels, Belgium

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Thierry Duprez Department of Radiology, Cliniques Universitaires Saint-Luc, Brussels, Belgium

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Edward Fomekong Department of Neurosurgery, Cliniques Universitaires Saint-Luc, Brussels, Belgium

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Christian Raftopoulos Department of Neurosurgery, Cliniques Universitaires Saint-Luc, Brussels, Belgium

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Orsalia Alexopoulou Department of Endocrinology and Nutrition, Cliniques Universitaires Saint-Luc, Brussels, Belgium

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Dominique Maiter Department of Endocrinology and Nutrition, Cliniques Universitaires Saint-Luc, Brussels, Belgium

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Objectives

The incidental diagnosis of nonfunctioning pituitary macroadenomas (NFPMAs) is becoming more prevalent with the spread of modern brain imaging techniques. We sought to uncover new data about their natural history and surgical outcome.

Design

This is a retrospective single-center observational study.

Methods

Among 210 patients seen for a NFPMA between 2010 and 2019, 70 (33%) were discovered incidentally (i-NFPMA). We analyzed outcomes in a total of 65 patients with available follow-up data.

Results

Mean age at diagnosis (± s.d.) was 60 ± 14 years and mean maximal diameter was 20.0 ± 7.3 mm. At diagnosis, 29 patients (45%) had pituitary hormone deficits (LH/FSH 41%, TSH 29%, ACTH 15%) and 12% had visual field deficits. 26 patients underwent initial surgery, while 12 had delayed surgery after initial surveillance. In the surveillance group, the risk of tumor growth was estimated at 10%/year. Patients with hormonal deficits at diagnosis experienced earlier growth at 24 months (P < 0.02). Overall, surgical resection of the i-NFPMA led to stable or improved endocrine function in 91% of patients, with only 6% postoperative permanent diabetes insipidus. Moreover, surgery was more effective in preserving intact endocrine function (10/12) than restoring altered endocrine function to normal (6/22, P = 0.03).

Conclusion

About one-third of NFPMAs are now discovered incidentally and a significant subset may be responsible for unrecognized endocrine and visual deficits. Under surveillance the risk of further tumor growth is significant (10%/year) and seems to occur faster in patients already harboring an endocrine deficit. Early surgical removal before onset of endocrine deficits appears to lead to better endocrine outcome.

Open access
Julia Beckhaus Department of Pediatrics and Pediatric Hematology/Oncology, University Children’s Hospital, Carl von Ossietzky University, Klinikum Oldenburg AöR, Oldenburg, Germany
Division of Epidemiology and Biometry, Carl von Ossietzky University, Oldenburg, Germany

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Svenja Boekhoff Department of Pediatrics and Pediatric Hematology/Oncology, University Children’s Hospital, Carl von Ossietzky University, Klinikum Oldenburg AöR, Oldenburg, Germany

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Katrin Scheinemann Pediatric Hematology-Oncology Center, Children’s Hospital of Eastern Switzerland, St. Gallen, Switzerland
Faculty of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
Department of Pediatrics, McMaster Children’s Hospital and McMaster University, Hamilton, Ontario, Canada

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Freimut H Schilling Department of Pediatrics, Division of Pediatric Hematology and Oncology, Children’s Hospital Lucerne, Lucerne, Switzerland

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Gudrun Fleischhack Pediatrics III, University Hospital of Essen, Essen, Germany

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Gerhard Binder University Children’s Hospital, Pediatric Endocrinology, University Tübingen, Tübingen, Germany

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Brigitte Bison Diagnostic and Interventional Neuroradiology, Faculty of Medicine, University of Augsburg, Augsburg, Germany

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Torsten Pietsch Institute of Neuropathology, DGNN Brain Tumor Reference Center, University of Bonn Medical Center, Bonn, Germany

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Carsten Friedrich Department of Pediatrics and Pediatric Hematology/Oncology, University Children’s Hospital, Carl von Ossietzky University, Klinikum Oldenburg AöR, Oldenburg, Germany

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Hermann L Müller Department of Pediatrics and Pediatric Hematology/Oncology, University Children’s Hospital, Carl von Ossietzky University, Klinikum Oldenburg AöR, Oldenburg, Germany

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Background

Craniopharyngiomas (CPs) are rare embryonic tumors. Clinical presentation and outcome of patients perinatally diagnosed with congenital CP (cCP) are not clear and refer mainly to a few case reports in the literature. The aim of this study was to analyze clinical presentation and outcome in patients with cCP.

Study design

Three hundred and sixty-one patients diagnosed with adamantinomatous CP were recruited 2007–2022 in KRANIOPHARYNGEOM 2007/Registry 2019 and prospectively observed. In two cases, cCP was diagnosed prenatally and in one case on the second day of life. Pre- and perinatal diagnostic findings, postnatal evaluation, and therapeutic interventions and outcome in these three cases of cCP were analyzed.

Results

All patients survived. One patient developed psychomotor retardation and a mild hemiparesis. Prenatal routine ultrasound examination led to the diagnosis of cCP. Tumor resection was performed during the early postnatal period (range: 11–51 days of age). Functional capacity, measured by Fertigkeitenskala-Münster-Heidelberg (FMH) was reduced in three and behavioral parameters, measured by the Strength and Difficulties Questionnaire (SDQ) were abnormal in two cases.

Conclusion

cCP is a rare diagnosis with a prevalence of 0.83% in our study group. Compared to cases reported in the literature, the presented cases were treated immediately and had a better prognosis. Based on improvements of diagnostic and therapeutic techniques, prenatal diagnosis of cCP should lead to transfer prior to delivery of cCP patients to a specialized center for delivery and postnatal treatment of newborns with sellar masses by a multidisciplinary team to secure the improved prognosis of these patients.

Significance statement

We previously reported that lower event-free survival rates after craniopharyngioma are associated with younger age at diagnosis. Perinatally diagnosed congenital craniopharyngiomas are very rare. This article presents three unique cases with congenital craniopharyngioma, comparing their diagnostics, therapy, and development. All three cases had surgery during the early postnatal period with sparing of the posterior hypothalamus. In each case, endocrinopathy was present at follow-up. Low functional capacity was reported in all cases and an abnormal total difficulties score in two cases. Compared to the literature, the presented cases had better prognosis in morbidity and mortality. This report and the review of the literature confirm the importance of a multidisciplinary approach in the diagnostic and treatment of the very rare condition of congenital craniopharyngioma.

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Pravik Solanki Faculty of Medicine, Nursing and Health Sciences, Monash University, Victoria, Australia
Alfred Health, Melbourne, Victoria, Australia

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Beng Eu Prahran Market Clinic, Victoria, Australia
Department of General Practice, Melbourne Medical School, The University of Melbourne, Victoria, Australia

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Jeremy Smith Faculty of Science, University of Western Australia, Perth, Australia

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Carolyn Allan Hudson Institute of Medical Research, Melbourne, Victoria, Australia

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Kevin Lee Faculty of Medicine, Nursing and Health Sciences, Monash University, Victoria, Australia

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Hypogonadism can result following anabolic steroid abuse. The duration and degree of recovery from anabolic steroid-induced hypogonadism (ASIH) is immensely variable, and there is a paucity of prospective controlled data characterising the trajectory of natural recovery following cessation. This poses difficulties for users trying to stop androgen abuse, and clinicians wanting to assist them. The objective of this paper was to synthesise evidence on the physical, psychological and biochemical patterns of ASIH recovery. We present the pathophysiology of ASIH through a literature review of hypothalamic–pituitary–testosterone axis recovery in supraphysiological testosterone exposure. This is followed by a scoping review of relevant observational and interventional studies published on PubMed and finally, a conclusion that is an easy reference for clinicians helping patients that are recovering from AAS abuse. Results indicate that ASIH recovery depends on age and degree of androgen abuse, with physical changes like testicular atrophy expected to have near full recovery over months to years; spermatogenesis expected to achieve full recovery over months to years; libido returning to baseline over several months (typically less potent than during AAS use); and recovery from gynaecomastia being unlikely. For psychological recovery, data are insufficient and conflicting, indicating a transient withdrawal period which may be followed by persisting longer-term milder symptoms. For biochemical recovery, near complete recovery of testosterone is seen over months, and complete gonadotropin recovery is expected over 3–6 months. Further prospective studies are indicated to more closely describe patterns of recovery.

Open access
Supitcha Patjamontri Developmental Endocrinology Research Group, University of Glasgow, Royal Hospital for Children, Glasgow, UK
Division of Endocrinology and Metabolism, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand

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Alexander Spiers MRC Centre for Environment and Health, Imperial College London, London, UK
NIHR Health Protection Research Unit on Chemical Radiation Threats and Hazards, Imperial College London, London, UK

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Rachel B Smith MRC Centre for Environment and Health, Imperial College London, London, UK
NIHR Health Protection Research Unit on Chemical Radiation Threats and Hazards, Imperial College London, London, UK
National Institute for Health Research (NIHR) Health Protection Research Unit in Environmental Exposures and Health, Imperial College London, London, UK
Mohn Centre for Children’s Health and Wellbeing, Imperial College London, London, UK

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Chen Shen MRC Centre for Environment and Health, Imperial College London, London, UK
NIHR Health Protection Research Unit on Chemical Radiation Threats and Hazards, Imperial College London, London, UK

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Jo Adaway Department of Clinical Biochemistry, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK

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Brian G Keevil Department of Clinical Biochemistry, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK

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Mireille B Toledano MRC Centre for Environment and Health, Imperial College London, London, UK
NIHR Health Protection Research Unit on Chemical Radiation Threats and Hazards, Imperial College London, London, UK
National Institute for Health Research (NIHR) Health Protection Research Unit in Environmental Exposures and Health, Imperial College London, London, UK
Mohn Centre for Children’s Health and Wellbeing, Imperial College London, London, UK

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S Faisal Ahmed Developmental Endocrinology Research Group, University of Glasgow, Royal Hospital for Children, Glasgow, UK

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Context

Salivary androgens represent non-invasive biomarkers of puberty that may have utility in clinical and population studies.

Objective

To understand normal age-related variation in salivary sex steroids and demonstrate their correlation to pubertal development in young adolescents.

Design, setting and participants

School-based cohort study of 1495 adolescents at two time points for collecting saliva samples approximately 2 years apart.

Outcome measures

The saliva samples were analyzed for five androgens (testosterone, androstenedione (A4), 17-hydroxyprogesterone, 11-ketotestosterone and 11β-hydroxyandrostenedione) using liquid chromatography-mass spectrometry; in addition, salivary dehydroepiandrosterone (DHEA) and oestradiol (OE2) were analysed by ELISA. The pubertal staging was self-reported using the Pubertal Development Scale (PDS).

Results

In 1236 saliva samples from 903 boys aged between 11 and 16 years, salivary androgens except DHEA exhibited an increasing trend with an advancing age (ANOVA, P < 0.001), with salivary testosterone and A4 concentration showing the strongest correlation (r = 0.55, P < 0.001 and r = 0.48, P < 0.001, respectively). In a subgroup analysis of 155 and 63 saliva samples in boys and girls, respectively, morning salivary testosterone concentrations showed the highest correlation with composite PDS scores and voice-breaking category from PDS self-report in boys (r = 0.75, r = 0.67, respectively). In girls, salivary DHEA and OE2 had negligible correlations with age or composite PDS scores.

Conclusion

In boys aged 11–16 years, an increase in salivary testosterone and A4 is associated with self-reported pubertal progress and represents valid non-invasive biomarkers of puberty in boys.

Open access
Lingjuan Li Department of Nursing, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China

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Jing Qin Department of Nursing, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China

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Lin Ren Department of Nursing, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China

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Shiyuan Xiang Department of Nursing, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China

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Xiaoyun Cao Department of Neurosurgery, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China
National Center for Neurological Disorders, Shanghai, China
Shanghai Clinical Medical Center of Neurosurgery, Shanghai, China
Neurosurgical Institute of Fudan University, Shanghai, China
Shanghai Key Laboratory of Medical Brain Function and Restoration and Neural Regeneration, Fudan University, Shanghai, China

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Xianglan Zheng Department of Nursing, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China

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Zhiwen Yin Department of Nursing, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China

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Nidan Qiao Department of Neurosurgery, Huashan Hospital, Shanghai Medical School, Fudan University, Shanghai, China
National Center for Neurological Disorders, Shanghai, China
Shanghai Clinical Medical Center of Neurosurgery, Shanghai, China
Neurosurgical Institute of Fudan University, Shanghai, China
Shanghai Key Laboratory of Medical Brain Function and Restoration and Neural Regeneration, Fudan University, Shanghai, China

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Purpose

We aimed to describe and predict the risk of severe hypernatremia after surgical resection of craniopharyngioma and to identify the association of water intake, urine output, and sodium level change in the patients.

Method

The outcome was postoperative severe hypernatremia. We identified risk factors associated with hypernatremia using multivariable regression. We trained machine learning models to predict the outcome. We compared serum sodium change, intravenous input, oral input, total input, urine output, and net fluid balance according to different nurse shifts.

Results

Among 234 included patients, 125 developed severe hypernatremia after surgery. The peak incidence occurred during day 0 and day 6 after surgery. The risk was increased in patients with gross total resection (odds ratio (OR) 2.41, P < 0.001), high Puget classification (OR 4.44, P = 0.026), preoperative adrenal insufficiency (OR 2.01, P = 0.040), and preoperative hypernatremia (OR 5.55, P < 0.001). The random forest algorithm had the highest area under the receiver operating characteristic curve (0.770, 95% CI, 0.727–0.813) in predicting the outcome and was validated in the prospective validation cohort. Overnight shifts were associated with the highest serum sodium increase (P = 0.010), less intravenous input (P < 0.001), and less desmopressin use (P < 0.001).

Conclusion

The overall incidence of severe hypernatremia after surgical resection of craniopharyngioma was significant, especially in patients with gross total resection, hypothalamus distortion, preoperative adrenal insufficiency, and preoperative severe hypernatremia. Less intravenous input and less desmopressin use were associated with serum sodium increases, especially during overnight shifts.

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Hyunjae Lee Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea

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Tae-Shin Kim Department of Laboratory Medicine, Seoul National University Hospital, Seoul, Republic of Korea

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Ja-Yoon Gu Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea

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Mi Ran Yu Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea

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Seung-Eun Lee Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea

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Eun Sook Kim Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea

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Hyun Kyung Kim Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea

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Objective

The inflammatory microenvironment has been implicated in differentiated thyroid cancer (DTC). Inflammatory stimuli induce the release of components of neutrophils into extracellular space, leading to formation of neutrophil extracellular trap (NET), which can stimulate growth and progression of cancer. Generation of activated factor XII and thrombin is also involved in cancer progression. This study attempted to determine whether the level of circulating markers of NET, activated factor XII, and endogenous thrombin potential may be useful for detecting the recurrence of DTC.

Methods

A total of 122 patients with DTC were recruited during the postoperative follow-up period. Measurement of the levels of circulating markers of NET (neutrophil elastase, histone–DNA complex, cell-free dsDNA), activated factor XII, and endogenous thrombin potential was performed.

Results

A significantly elevated level of neutrophil elastase was detected in patients with recurrence (n = 12) compared to those without recurrence (n = 110), while significant elevation of the levels of other markers was not observed. The value for area under the curve (0.717, P = 0.018) of neutrophil elastase for detecting recurrence of DTC was superior to that (0.661, P = 0.051) of serum thyroglobulin. An elevated level of neutrophil elastase was significantly associated with recurrence of DTC independent of serum thyroglobulin.

Conclusions

Because an elevated level of neutrophil elastase was detected in patients with recurrence of DTC and showed a significant association with recurrence of DTC, it can be proposed as a novel biomarker for use in detecting recurrence of DTC along with other tests.

Open access
A Bergougnoux Service de Génétique Moléculaire et de Cytogénétique, Centre Hospitalier Universitaire de Montpellier, Université de Montpellier, Montpellier, France

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L Gaspari Département d'Endocrinologie et de Gynécologie Pédiatrique, Hôpital Arnaud de Villeneuve, Université de Montpellier, Montpellier, France
INSERM Unité 1203 (DEFE), Université de Montpellier, Montpellier, France

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M Soleirol Département de Pediatrie, CHU Nîmes, France, Université de Montpellier Faculté de Médecine Montpellier-Nîmes, Montpellier, France

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N Servant Service de Génétique Moléculaire et de Cytogénétique, Centre Hospitalier Universitaire de Montpellier, Université de Montpellier, Montpellier, France

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S Soskin Département de Pédiatrie, Centre Hospitalier Universitaire Hautepierre de Strasbourg, Strasbourg, France

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S Rossignol Département de Pédiatrie, Centre Hospitalier Universitaire Hautepierre de Strasbourg, Strasbourg, France

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K Wagner-Mahler Département de Pédiatrie, CHU Nice, Hôpitaux Pédiatriques de Nice CHU-Lenval, Nice, France

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J Bertherat Department of Endocrinology, French Reference Center for Rare Adrenal Disorders, Hôpital Cochin, Université Paris Cité, Institut Cochin, Assitance Publique-Hôpitaux de Paris, Paris, France

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C Sultan Département d'Endocrinologie et de Gynécologie Pédiatrique, Hôpital Arnaud de Villeneuve, Université de Montpellier, Montpellier, France

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N Kalfa Department of Pediatric Urological Surgery, French Reference Center for abnormalities of Genital Development (DevGen), CHU Lapeyronie, Montpellier University, Montpellier, France

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F Paris Service de Génétique Moléculaire et de Cytogénétique, Centre Hospitalier Universitaire de Montpellier, Université de Montpellier, Montpellier, France
Département d'Endocrinologie et de Gynécologie Pédiatrique, Hôpital Arnaud de Villeneuve, Université de Montpellier, Montpellier, France
INSERM Unité 1203 (DEFE), Université de Montpellier, Montpellier, France

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Although hyperandrogenism is a frequent cause of consultation in adolescent girls, more severe forms with virilization must lead to suspicion of an adrenal or ovarian tumor. However, they may also reveal a 46,XY disorder of sexual development (DSD). Here, we describe four adolescent girls referred for pubertal virilization and in whom we diagnosed a 46,XY DSD. We performed gene mutation screening by Sanger sequencing (all patients) and by next-generation sequencing (NGS) in patient #4. We identified new heterozygous NR5A1 gene variants in patients #1 and #2 and a homozygous SRD5A2 gene deletion in patient #3. Patient #4 received a diagnosis of complete androgen insensitivity in childhood; however, due the unusual pubertal virilization, we completed the gene analysis by NGS that revealed two heterozygous HSD17B3 variants. This work underlines the importance of considering the hypothesis of 46,XY DSD in adolescent girls with unexplained virilization at puberty.

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Kathryn Lingen Close Concerns, San Francisco, California, USA

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Talia Pikounis Close Concerns, San Francisco, California, USA

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Natalie Bellini University Hospitals, Cleveland, Ohio, USA

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Diana Isaacs Cleveland Clinic, Cleveland, Ohio, USA

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Insulin administration remains vital to the treatment of diabetes and although there have been advances in insulin delivery, evidence suggests that many people with diabetes on insulin therapy have suboptimal glycemic management. Recent advancements in insulin administration techniques include connected insulin devices, such as connected insulin pens and pen caps. In this review, we provide an overview of the literature on the use of connected insulin pens and pen caps to further elucidate the clinical benefits and drawbacks of these devices. We discuss the development of these devices, outlining the characteristics of insulin pens and pen caps with regulatory approvals. These devices have different features that can ease the burden of diabetes management, including automatic recording of insulin dose information, tracking of insulin-on-board, bolus calculators, and missed dose alerts. Despite the advantages of connected pens and pen caps, a small percentage of insulin users are currently using these devices, due to many factors, including lack of health-care professional awareness, initial training for prescribers, and setup of the device. Overcoming these barriers and publishing more data demonstrating the glycemic outcomes associated with these systems could improve diabetes management for people living with diabetes. As health-care systems become increasingly digital, connected insulin pens have the potential to allow a data-driven approach to diabetes management for people who are not interested in, cannot afford, or do not have intensive insulin regimens that might warrant use of insulin pumps or automated insulin delivery systems.

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Jelena Stankovic Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark

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Kurt Kristensen Steno Diabetes Center Aarhus (SDCA), Aarhus University Hospital, Aarhus, Denmark
Department of Pediatrics, Aarhus University Hospital, Aarhus, Denmark

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Niels Birkebæk Department of Pediatrics, Aarhus University Hospital, Aarhus, Denmark

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Jens Otto Lunde Jørgensen Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark

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Esben Søndergaard Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
Steno Diabetes Center Aarhus (SDCA), Aarhus University Hospital, Aarhus, Denmark

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Background

The diagnosis of the polyuria–polydipsia syndrome is challenging. Copeptin is a robust biomarker of arginine vasopressin (AVP) secretion. Arginine, which stimulates growth hormone (GH), has been shown also to stimulate copeptin secretion via unknown mechanisms.

Aim

The aim was to investigate copeptin levels in response to three different GH stimulation tests in patients suspected of GH deficiency.

Methods

In this cross-sectional study, we measured plasma copeptin levels at baseline and at 60, 105, and 150 min in patients undergoing a stimulation test for growth hormone deficiency with either arginine (n = 16), clonidine (n = 8) or the insulin tolerance test (ITT) (n = 10).

Results

In patients undergoing the arginine test, the mean age was 9 years, and 10 years for clonidine. The ITT was only performed in adult patients (>18 years) with a mean age of 49 years. Copeptin level increased significantly from baseline to 60 min after arginine (P <0.01) and ITT (P < 0.01). By contrast, copeptin level tended to decrease after clonidine stimulation (P = 0.14).

Conclusion

These data support that infusion of arginine increases plasma copeptin levels and reveal a comparable response after an ITT. We hypothesize that the underlying mechanism is abrogation of somatostatin-induced AVP suppression.

Open access