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Voicu V, Tataru CP, Toader C, Covache-Busuioc RA, Glavan LA, Bratu BG, Costin HP, Corlatescu AD, Ciurea AV. Decoding Neurodegeneration: A Comprehensive Review of Molecular Mechanisms, Genetic Influences, and Therapeutic Innovations. Int J Mol Sci 2023; 24:13006. [PMID: 37629187 PMCID: PMC10455143 DOI: 10.3390/ijms241613006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/17/2023] [Accepted: 08/18/2023] [Indexed: 08/27/2023] Open
Abstract
Neurodegenerative disorders often acquire due to genetic predispositions and genomic alterations after exposure to multiple risk factors. The most commonly found pathologies are variations of dementia, such as frontotemporal dementia and Lewy body dementia, as well as rare subtypes of cerebral and cerebellar atrophy-based syndromes. In an emerging era of biomedical advances, molecular-cellular studies offer an essential avenue for a thorough recognition of the underlying mechanisms and their possible implications in the patient's symptomatology. This comprehensive review is focused on deciphering molecular mechanisms and the implications regarding those pathologies' clinical advancement and provides an analytical overview of genetic mutations in the case of neurodegenerative disorders. With the help of well-developed modern genetic investigations, these clinically complex disturbances are highly understood nowadays, being an important step in establishing molecularly targeted therapies and implementing those approaches in the physician's practice.
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Affiliation(s)
- Victor Voicu
- Pharmacology, Toxicology and Clinical Psychopharmacology, “Carol Davila” University of Medicine and Pharmacy in Bucharest, 020021 Bucharest, Romania;
- Medical Section within the Romanian Academy, 010071 Bucharest, Romania
| | - Calin Petre Tataru
- Department of Opthamology, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
- Central Military Emergency Hospital “Dr. Carol Davila”, 010825 Bucharest, Romania
| | - Corneliu Toader
- Department of Neurosurgery, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania; (R.-A.C.-B.); (L.A.G.); (B.-G.B.); (H.P.C.); (A.D.C.); (A.V.C.)
- Department of Vascular Neurosurgery, National Institute of Neurology and Neurovascular Diseases, 077160 Bucharest, Romania
| | - Razvan-Adrian Covache-Busuioc
- Department of Neurosurgery, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania; (R.-A.C.-B.); (L.A.G.); (B.-G.B.); (H.P.C.); (A.D.C.); (A.V.C.)
| | - Luca Andrei Glavan
- Department of Neurosurgery, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania; (R.-A.C.-B.); (L.A.G.); (B.-G.B.); (H.P.C.); (A.D.C.); (A.V.C.)
| | - Bogdan-Gabriel Bratu
- Department of Neurosurgery, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania; (R.-A.C.-B.); (L.A.G.); (B.-G.B.); (H.P.C.); (A.D.C.); (A.V.C.)
| | - Horia Petre Costin
- Department of Neurosurgery, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania; (R.-A.C.-B.); (L.A.G.); (B.-G.B.); (H.P.C.); (A.D.C.); (A.V.C.)
| | - Antonio Daniel Corlatescu
- Department of Neurosurgery, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania; (R.-A.C.-B.); (L.A.G.); (B.-G.B.); (H.P.C.); (A.D.C.); (A.V.C.)
| | - Alexandru Vlad Ciurea
- Department of Neurosurgery, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania; (R.-A.C.-B.); (L.A.G.); (B.-G.B.); (H.P.C.); (A.D.C.); (A.V.C.)
- Neurosurgery Department, Sanador Clinical Hospital, 010991 Bucharest, Romania
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Pitakpatapee Y, Srikajon J, Sangpeamsook T, Saengphatrachai W, Srivanitchapoom P. A Rare Cause of a Treatable Abnormal Movement, Not to Miss. Mov Disord Clin Pract 2022; 9:S13-S16. [PMID: 36118509 PMCID: PMC9465002 DOI: 10.1002/mdc3.13541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 02/21/2022] [Accepted: 03/12/2022] [Indexed: 11/09/2022] Open
Affiliation(s)
- Yuvadee Pitakpatapee
- Division of Neurology, Department of Medicine, Faculty of Medicine Siriraj HospitalMahidol UniversityBangkokThailand
| | - Jindapa Srikajon
- Division of Neurology, Department of Medicine, Faculty of Medicine Siriraj HospitalMahidol UniversityBangkokThailand
| | - Tanita Sangpeamsook
- Division of Neurology, Department of Medicine, Faculty of Medicine Siriraj HospitalMahidol UniversityBangkokThailand
| | - Weerawat Saengphatrachai
- Division of Neurology, Department of Medicine, Faculty of Medicine Siriraj HospitalMahidol UniversityBangkokThailand
| | - Prachaya Srivanitchapoom
- Division of Neurology, Department of Medicine, Faculty of Medicine Siriraj HospitalMahidol UniversityBangkokThailand
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G J, Bansal R, Ajmal M, Gupta P, Pathania M. Young Male With Seizure Disorder and Intracranial Calcification: A Case of Fahr’s Syndrome. Cureus 2022; 14:e22189. [PMID: 35308708 PMCID: PMC8925936 DOI: 10.7759/cureus.22189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/13/2022] [Indexed: 11/18/2022] Open
Abstract
Fahr’s syndrome is a neurodegenerative disorder characterized by abnormal deposition of calcium in the brain, especially in basal ganglia. The term Fahr’s disease is used when primary familial brain calcification is present, and the term Fahr’s syndrome is used for secondary causes. Our patient is a 35-year-old male who presented to our hospital with complaints of two episodes of generalized tonic-clonic seizures. He had a history of recurrent episodes of seizures since the age of 15 and they all were generalized tonic-clonic seizures. He did not have a family history of epilepsy. Lab investigations showed a normal hemogram, and liver and renal function were within normal limits. Serum electrolyte levels showed hypocalcemia, but other electrolyte levels were normal. He had low parathyroid hormone levels and normal levels of vitamin D. Brain imaging studies with non-contrast CT and a contrast-enhanced MRI showed bilaterally symmetrical dense calcifications. The etiology in our patient was the primary hypoparathyroidism and was treated accordingly. He reported symptomatic improvement with treatment and had no episodes of seizures after the commencement of the treatment. So, in cases of Fahr’s syndrome, treatable etiologies must be ruled out as they can delay the progression of the disease.
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Faisal M, Kukkle PL. Hypoparathyroidism Masquerading as Corticobasal Syndrome. Mov Disord Clin Pract 2021; 8:600-603. [PMID: 33981794 PMCID: PMC8088101 DOI: 10.1002/mdc3.13182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/10/2021] [Accepted: 02/24/2021] [Indexed: 01/26/2023] Open
Affiliation(s)
| | - Prashanth Lingappa Kukkle
- Center for Parkinson's Disease and Movement Disorders ClinicVikram HospitalsBangaloreIndia
- Parkinson's Disease and Movement Disorders ClinicBangaloreIndia
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Fahr's syndrome due to hypoparathyroidism revisited: A case of parkinsonism and a review of all published cases. Clin Neurol Neurosurg 2021; 202:106514. [PMID: 33529967 DOI: 10.1016/j.clineuro.2021.106514] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/18/2021] [Accepted: 01/19/2021] [Indexed: 11/23/2022]
Abstract
INTRODUCTION Fahr's syndrome due to hypoparathyroidism refers to bilateral basal ganglia (BG) calcifications and manifests with movement disorders, seizures, cognitive and behavioral symptoms. CASE PRESENTATION We report a case of a 74-year-old woman, who presented with parkinsonism due to post-surgical hypoparathyroidism and normal DaT scan, despite extensive calcifications of the BG, periventricular white matter, and cerebellum. METHODS A comprehensive literature review of all reported cases of Fahr's syndrome due to hypoparathyroidism was conducted in the electronic databases PubMed and Web of science. Moreover, demographic and clinical characteristics of the patients overall were calculated and associated with radiological findings. RESULTS We reviewed a total of 223 cases with Fahr's syndrome due to hypoparathyroidism (124 female, 99 male). Mean age on presentation was 44.6 ± 17.7 years. Thirty nine percent of patients had idiopathic hypoparathyroidism, 35.4 % acquired and 25.6 % pseudohypoparathyroidism. Almost half of the patients had tetany, seizures or a movement disorder and approximately 40 % neuropsychiatric symptoms. The patients with a movement disorder had a 2.23 likelihood of having neuropsychiatric symptoms as well (OR 2.23, 95 % CI 1.29-3.87). Moreover, there was a statistically significant association between the phenotype severity (i.e. the presence of more than one symptom) and the extent of brain calcifications (χ2 = 32.383, p = 0.009). CONCLUSION Fahr's syndrome is a rare disorder, which nonetheless manifests with several neurological symptoms. A head CT should be considered for patients with hypoparathyroidism and neurological symptoms. More studies using DaT scan are needed to elucidate the effects of calcifications on the dopaminergic function of the BG.
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Abstract
BACKGROUND Hypoparathyroidism is a rare endocrine disorder characterized by hypocalcemia and low or undetectable levels of parathyroid hormone. METHODS This review is an evidence-based summary of hypoparathyroidism in terms of relevant pathophysiological, clinical, and therapeutic concepts. RESULTS Many clinical manifestations of hypoparathyroidism are due to the lack of the physiological actions of parathyroid hormone on its 2 major target organs: the skeleton and the kidney. The skeleton is inactive, accruing bone without remodeling it. The kidneys lose the calcium-conserving actions of parathyroid hormone and, thus, excrete a greater fraction of calcium. Biochemical manifestations, besides hypocalcemia and low or undetectable levels of parathyroid hormone, include hyperphosphatemia and low levels of 1,25-dihydroxyvitamin D. Calcifications in the kidney, brain, and other soft tissues are common. Removal of, or damage to, the parathyroid glands at the time of anterior neck surgery is, by far, the most likely etiology. Autoimmune destruction of the parathyroid glands and other genetic causes represent most of the other etiologies. Conventional treatment with calcium and active vitamin D can maintain the serum calcium level but high doses may be required, adding to the risk of long-term soft tissue calcifications. The advent of replacement therapy with recombinant human PTH(1-84) represents a major step in the therapeutics of this disease. CONCLUSIONS Advances in our knowledge of hypoparathyroidism have led to greater understanding of the disease itself and our approach to it.
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Affiliation(s)
- John P Bilezikian
- Department of Medicine, Division of Endocrinology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York
- Correspondence and Reprint Requests: John P. Bilezikian, Vice-Chair, International Research and Education, Department of Medicine, Vagelos College of Physicians and Surgeons, 630 W. 168th Street, New York, NY 10032. E-mail:
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Lopera JZ, Tabares SAL, Herrera DÁ, Henao EC, Barragán FAJ, Barrera CAB, Corrales JDG, Marín CR, Castro DC, Román-González A. Characteristics of hypoparathyroidism in Colombia: data from a single center in the city of Medellín. ARCHIVES OF ENDOCRINOLOGY AND METABOLISM 2020; 64:282-289. [PMID: 32555995 PMCID: PMC10522211 DOI: 10.20945/2359-3997000000250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 03/29/2020] [Indexed: 11/23/2022]
Abstract
OBJECTIVE Hypoparathyroidism is a rare condition, whose most common etiology is complications of neck surgery. The aim of the study was to identify the clinical and biochemical profile of the patients with diagnosis of hypoparathyroidism, including the frequency of symptoms, clinical signs, long-term complications and disease control. Additionally, the study sought to know what the medication profile was, and the doses required by the patients. SUBJECTS AND METHOD A retrospective cohort study was conducted wherein all patients with ICD-10 codes associated with hypoparathyroidism between 2011 and 2018 at the Hospital Universitario San Vicente Fundación were included. We investigated the etiology of the disease; biochemical profile including lowest serum calcium, highest serum phosphorus, 25OHD levels, calciuria and calcium/phosphorus product; medication doses, disease control, and presence of complications, especially renal and neurologic complications were also evaluated. RESULTS The cohort included 108 patients (99 women/9 men) with a mean age of 51.6 ± 15.6 years. The main etiology was postoperative (93.5%), the dose of elemental calcium received was relatively low (mean 1,164 mg/day), and in only 9.2% of cases more than 2,500 mg/day of elemental calcium was necessary. We were able to evaluate the follow-up in 89 patients, and found that only 57.3% met the criteria for controlled disease. CONCLUSION The clinical profile of patients with hypoparathyroidism in our cohort is similar to that described in other international studies, with predominantly postoperative etiology. With standard therapy, only adequate control is achieved in a little more than half of patients. Arch Endocrinol Metab. 2020;64(3):282-9.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Alejandro Román-González
- Universidad de Antioquia, Medellín, Colombia
- Hospital Universitario San Vicente Fundación, Medellin, Colombia
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Petersenn S, Bojunga J, Brabant G, Etzrodt-Walter G, Finke R, Scharla S, Stamm B, Weber MM, Wicke C, Siggelkow H. [Hypoparathyroidism - un underestimated problem?]. MMW Fortschr Med 2020; 161:12-20. [PMID: 31828671 DOI: 10.1007/s15006-019-1174-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND Hypoparathyroidism is a rare and disabilitating disorder characterized by hypocalcemia and low parathyroid hormone levels. Most of the cases occur as a result of the removal of parathyroid glands or damage to the glands during neck surgery. More rare causes include nonsurgical causes such as autoimmune or genetic diseases. METHOD In this review, a panel of experts presents the current state of diagnosis and therapy of hypoparathyroidism and explains practical aspects of caring for the affected patients. RESULTS Common signs and symptoms are abnormal sensations and increased excitability in the lower limbs, paresthesia of perioral areas and nocturnal leg cramps. Renal complications frequently occur, but also basal ganglia calcification. Treatment consists of administration of vitamin D analogs in combination with 0.5-1.0 g calcium daily. An adjunctive treatment with the in April 2017 approved recombinant human parathyroid hormone (1-84) is an option for patients whose hypoparathyroidism is difficult to control by conventional treatment alone. Initially and after dose changes follow-up controls should be performed at least every 2 weeks, in well-controlled patients or in the case of chronic progression every 3-6 months.
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Affiliation(s)
- Stephan Petersenn
- ENDOC Praxis für Endokrinologie, Andrologie und medikamentöse Tumortherapie, Hamburg, Deutschland. .,ENDOC Praxis für Endokrinologie, Andrologie und medikamentöse, Tumortherapie, Erik-Blumenfeld-Platz 27A, D-22587, Hamburg, Deutschland.
| | - Jörg Bojunga
- Medizinische Klinik 1, Gastroenterologie und Hepatologie, Pneumologie und Allergologie, Endokrinologie und Diabetologie sowie Ernährungsmedizin, Universitätsklinikum Frankfurt, Frankfurt am Main, Deutschland
| | - Georg Brabant
- Medizinische Klinik I, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Lübeck, Deutschland
| | | | - Reinhard Finke
- Innere Medizin, Endokrinologie/Diabetologie & Allgemeinmedizin, Praxisgemeinschaft an der Kaisereiche, Berlin, Deutschland
| | | | - Bettina Stamm
- Medicover Saarbrücken MVZ, Praxis für Innere Medizin, Endokrinologie und Diabetologie, Andrologie, Osteologie und Allgemeinmedizin, Saarbrücken, Deutschland
| | - Matthias M Weber
- I. Medizinische Klinik und Poliklinik, Schwerpunkt Endokrinologie und Stoffwechselerkrankungen, Universitätsmedizin Mainz, Deutschland
| | - Corinna Wicke
- Schilddrüsenzentrum, Luzerner Kantonsspital, Luzern, Schweiz
| | - Heide Siggelkow
- MVZ Endokrinologikum Göttingen, Zentrum für Hormon- und Stoffwechselerkrankungen, Nuklearmedizin und Humangenetik, Göttingen, Deutschland.,Klinik für Gastroenterologie und gastrointestinale Onkologie, Klinik für Gastroenterologie und Endokrinologie, Universitätsmedizin Göttingen, Deutschland
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Tabacco G, Naciu AM, Maggi D, Santonati A, Pedone C, Cesareo R, Bosco D, Gaspa G, Napoli N, Pozzilli P, Manfrini S, Palermo A. Cardiovascular Autonomic Neuropathy as a New Complication of Postsurgical Chronic Hypoparathyroidism. J Bone Miner Res 2019; 34:475-481. [PMID: 30395692 DOI: 10.1002/jbmr.3623] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Revised: 10/22/2018] [Accepted: 10/28/2018] [Indexed: 12/22/2022]
Abstract
Postsurgical hypoparathyroidism (hypoPT) increases fatigue and seems to affect the risk of mortality. Cardiovascular autonomic neuropathy (CAN) is an impairment of the cardiovascular autonomic system, a cause of increased mortality, and associated with increased fatigability. The aim of this study is to evaluate CAN in hypoPT and its relationship with hypocalcemia, PTH levels, and hyperphosphatemia. This is a cross-sectional study comparing 51 postsurgical hypoPT patients treated with calcium and calcitriol and 43 control subjects without any PTH/calcium/phosphate disorders who underwent thyroidectomy. CAN was assessed by heart rate (HR) response to deep breathing, HR response to the lying-to-standing test, HR response to the Valsalva maneuver, and blood pressure response to standing. Participants were considered to have "early CAN" if they had one abnormal result in the HR tests and "definite CAN" with two or more abnormal results. The prevalence of CAN was 23% in the control group and 78% in the hypoPT group (OR 11.48; 95% CI, 4.48 to 32.17). Patients with hypoPT and serum calcium (sCa) ≥8.5 mg/dL had a prevalence of early CAN of 72.4% and the prevalence was 86.4% in those with sCa <8.5 mg/dL. Definite CAN was found in 2.3% of the control group, 24.1% of the hypoPT group without hypocalcemia, and 59.1% of the hypoPT group with hypocalcemia. In the hypoPT group, the OR for definite CAN in the patients with hypocalcemia compared to the patients with normocalcemia was 4.54 (95% CI, 1.36 to 15.11). The association between low sCa and definite CAN was confirmed after adjustment for confounders with OR 13.62 (95% CI, 2.12 to 149.84). No association was found between definite CAN and PTH levels or high phosphate levels. HypoPT is associated with CAN and hypocalcemia seems to affect its severity. Larger and prospective studies are needed to confirm our findings. © 2018 American Society for Bone and Mineral Research.
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Affiliation(s)
- Gaia Tabacco
- Unit of Endocrinology and Diabetes, University Campus Bio-Medico, Rome, Italy
| | - Anda Mihaela Naciu
- Unit of Endocrinology and Diabetes, University Campus Bio-Medico, Rome, Italy
| | - Daria Maggi
- Unit of Endocrinology and Diabetes, University Campus Bio-Medico, Rome, Italy
| | - Assunta Santonati
- Department of Endocrinology, San Giovanni Addolorata Hospital, Rome, Italy
| | - Claudio Pedone
- Unit of Geriatric, University Campus Bio-Medico, Rome, Italy
| | - Roberto Cesareo
- Thyroid and Metabolic Bone Diseases Center, Santa Maria Goretti Hospital, Latina, Italy
| | - Daniela Bosco
- Department of Endocrinology, San Giovanni Addolorata Hospital, Rome, Italy
| | - Gianluigi Gaspa
- Thyroid and Metabolic Bone Diseases Center, Santa Maria Goretti Hospital, Latina, Italy
| | - Nicola Napoli
- Unit of Endocrinology and Diabetes, University Campus Bio-Medico, Rome, Italy.,IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
| | - Paolo Pozzilli
- Unit of Endocrinology and Diabetes, University Campus Bio-Medico, Rome, Italy
| | - Silvia Manfrini
- Unit of Endocrinology and Diabetes, University Campus Bio-Medico, Rome, Italy
| | - Andrea Palermo
- Unit of Endocrinology and Diabetes, University Campus Bio-Medico, Rome, Italy
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Hu ZX, Lu XD, Lou DN, Zhou ML, Zhu QR, Luo SS, Chen MY. A case report of a Chinese patient with 22q11.2 deletion accompanied with EOPD, severe dystonia and hypocalcemia. Clin Park Relat Disord 2019; 1:72-73. [PMID: 34316604 PMCID: PMC8288804 DOI: 10.1016/j.prdoa.2019.07.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 07/07/2019] [Accepted: 07/15/2019] [Indexed: 11/26/2022] Open
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Abstract
Hypoparathyroidism is associated with a spectrum of clinical manifestations in the acute and chronic settings, from mild to debilitating. Although the acute symptoms of hypocalcemia are primarily due to neuromuscular irritability, the chronic manifestations of hypoparathyroidism may be due to the disease itself or to complications of therapy or to both. The chronic complications of hypoparathyroidism can affect multiple organ systems, including the renal, neurologic, neuropsychiatric, skeletal, and immune systems. Further research is needed to determine the pathophysiology of complications in hypoparathyroidism and whether interventions can decrease the risk of these complications.
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Affiliation(s)
- Natalie E Cusano
- Department of Medicine, Bone Metabolism Program, Lenox Hill Hospital, Zucker School of Medicine at Hofstra/Northwell, 110 East 59th Street, 8th Floor, Suite 8B, New York, NY 10022, USA.
| | - John P Bilezikian
- Division of Endocrinology, Department of Medicine, Columbia University College of Physicians and Surgeons, 630 West 168th Street, PH 8W-864, New York, NY 10032, USA
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Abstract
Hypoparathyroidism is a disease characterized by inadequately low circulating concentrations of parathyroid hormone (PTH) resulting in low calcium levels and increased phosphate levels in the blood. Symptoms of the disease result from increased neuromuscular irritability caused by hypocalcaemia and include tingling, muscle cramps and seizures. The most common cause of the disease is inadvertent removal of, or injury to, the parathyroid glands during neck surgery, followed by genetic, idiopathic and autoimmune aetiologies. Conventional treatment includes activated vitamin D and/or calcium supplements, but this treatment does not fully replace the functions of PTH and can lead to short-term problems (such as hypocalcaemia, hypercalcaemia and increased urinary calcium excretion) and long-term complications (which include nephrocalcinosis, kidney stones and brain calcifications). PTH replacement has emerged as a new treatment option. Clinical trials using human PTH(1-34) and PTH(1-84) showed that this treatment was safe and effective in studies lasting up to 6 years. Recombinant human PTH(1-84) has been approved in the United States and Europe for the management of hypoparathyroidism; however, its effect on long-term complications is still being evaluated. Clinical practice guidelines, which describe the consensus of experts in the field, have been published and recognize the need for more research to optimize care. In this Primer, we summarize current knowledge of the prevalence, pathophysiology, clinical presentation and management of hypoparathyroidism.
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Kamath SD, Rao BS. Delayed Post-Surgical Hypoparathyroidism: The Forgotten Chameleon! J Clin Diagn Res 2017; 11:OD07-OD09. [PMID: 28384917 PMCID: PMC5376817 DOI: 10.7860/jcdr/2017/23609.9260] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 11/18/2016] [Indexed: 01/21/2023]
Abstract
Delayed hypoparathyroidism, due to accidental gland removal or ischemia of parathyroids can present many years after thyroidectomy and symptoms may be non-specific. This condition, if not diagnosed timely, may prove fatal and have serious consequences. Hence, clinicians must have a high index of suspicion to treat this condition. All patients with a history of previous thyroid surgery, who come with vague symptoms like fatigue, muscle aches should undergo estimation of serum calcium, phosphorus and Parathyroid Hormone (PTH) due to the lack of any pathognomonic features of hypoparathyroidism. We report a rare case of delayed post-surgical hypoparathyroidism who became symptomatic 15 years after thyroid surgery and remained so for another 10 years before the final diagnosis was established.
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Affiliation(s)
- Sangita Deepak Kamath
- Consultant, Department of Medicine, Tata Main Hospital, Jamshedpur, Jharkhand, India
| | - Balllamudi Srinivas Rao
- Senior Specialist and Head of Department, Department of Medicine, Tata Main Hospital, Jamshedpur, Jharkhand, India
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Cassiani-Miranda CA, Herazo-Bustos M, Cabrera-González A, Cadena-Ramos I, Barrios-Ayola F. [Psychosis Associated With Fahr's Syndrome: A Case Report]. REVISTA COLOMBIANA DE PSIQUIATRIA 2015; 44:256-261. [PMID: 26578478 DOI: 10.1016/j.rcp.2015.03.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2015] [Revised: 02/18/2015] [Accepted: 03/21/2015] [Indexed: 06/05/2023]
Abstract
INTRODUCTION Fahr syndrome (SF) is a rare neurological disorder, characterized by abnormal deposition of calcium in brain areas that control movement. OBJECTIVE The case is presented of a 41-year-old female with a convulsive syndrome, psychotic disorder, neurocognitive disorde,r and intellectual disability associated with bilateral brain calcifications and altered calcium/phosphorus metabolism in the context of hypoparathyroidism. METHOD Case report. RESULTS The calcifications found in the patient could be the cause of psychotic symptoms and cognitive impairment. Diagnostic imaging, laboratory tests, psychiatric and neuropsychological assessments are presented. The clinical presentation of this case is compared with similar ones reported in the literature. Therapeutic approaches and clinical outcomes are described. CONCLUSIONS Fahr's syndrome should be suspected in patients with neuropsychiatric disorders and seizures. Neuroimaging studies, and the determining of phosphorus and calcium metabolism and parathyroid hormone levels are important in this type of patient.
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Affiliation(s)
- Carlos Arturo Cassiani-Miranda
- Grupo de Investigación en Psiquiatría y Salud Mental, Facultad de Medicina, Universidad de Cartagena, Cartagena, Colombia.
| | - Mariana Herazo-Bustos
- Grupo de Investigación en Psiquiatría y Salud Mental, Facultad de Medicina, Universidad de Cartagena, Cartagena, Colombia
| | | | | | - Francisco Barrios-Ayola
- Grupo de Investigación en Psiquiatría y Salud Mental, Facultad de Medicina, Universidad de Cartagena, Cartagena, Colombia
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Terada T, Kakimoto A, Yoshikawa E, Kono S, Bunai T, Hosoi Y, Sakao-Suzuki M, Konishi T, Miyajima H, Ouchi Y. The Possible Link between GABAergic Dysfunction and Cognitive Decline in a Patient with Idiopathic Hypoparathyroidism. Intern Med 2015; 54:2245-50. [PMID: 26328655 DOI: 10.2169/internalmedicine.54.4295] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Idiopathic hypoparathyroidism (IHP) is accompanied by cognitive impairment. We report the case of a 70-year-old IHP patient with cognitive disturbance. Brain computed tomography showed bilateral calcification in basal ganglia, thalamus, and cerebellum. Neuropsychological assessment revealed low scores for intelligence, memory, and perseverative errors. Brain positron emission tomography showed a significant reduction in [(18)F]-Fludeoxyglucose (FDG) uptake in bilateral frontal, left temporal and parietal cortices, along with a marked reduction in [(11)C]-flumazenil binding in left frontal, temporal, parietal, and bilateral cerebellum. These findings suggest cognitive impairment in IHP may be ascribed to GABAergic dysfunction, thus leading to, or coexisting with, cerebral hypometabolism.
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Affiliation(s)
- Tatsuhiro Terada
- Department of Biofunctional Imaging, Medical Photonics Research Center, Hamamatsu University School of Medicine, Japan
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Sikjaer T, Rolighed L, Hess A, Fuglsang-Frederiksen A, Mosekilde L, Rejnmark L. Effects of PTH(1-84) therapy on muscle function and quality of life in hypoparathyroidism: results from a randomized controlled trial. Osteoporos Int 2014; 25:1717-26. [PMID: 24687385 DOI: 10.1007/s00198-014-2677-6] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Accepted: 02/26/2014] [Indexed: 01/13/2023]
Abstract
UNLABELLED The effects of treatment with 100 μg parathyroid hormone (PTH) (1-84) or an identical placebo on muscle function and quality of life (QoL) was studied in hypoparathyroid patients. At baseline, we found reduced QoL but no myopathy in the patients. Six months of treatment did not improve QoL, and muscle strength decreased slightly. INTRODUCTION A reduced quality of life (QoL) and myopathy that may be due to the absence of PTH have been reported in patients with hypoparathyroidism (hypoPT). METHODS Sixty-two patients with chronic hypoPT were randomized to 6 months of treatment with either PTH(1-84) 100 μg/d s.c. or placebo, given as add-on therapy to conventional treatment. Muscle function and postural stability were investigated using a dynamometer chair, a stadiometer platform, the repeated chair stands test, the timed up and go test, and electromyography. QoL was assessed using the 36-item Short Form Health Survey and the WHO-5 Well-Being Index. RESULTS The mean age of the patients was 52 ± 11 years, and 85 % were females. At baseline, QoL was significantly reduced in comparison with norm-based scores. Compared with placebo, PTH did not improve QoL or muscle function. Rather, max force production decreased significantly by 30 % at elbow flexion in the PTH group compared with the placebo group. Moreover, there was a nonsignificant trend for muscle strength to decrease in the upper extremities and on knee extension in response to PTH. Treatment did not affect postural stability. Electromyography showed a slight decrease in the duration of motor unit potentials in the PTH group, indicating a tendency toward myopathy, which, however was not symptomatic. CONCLUSIONS Overall, our data do not support an immediate beneficial effect of PTH replacement therapy on muscle function or QoL. A high frequency of hypercalcemia among our patients may have compromised the potential beneficial effects of reversing the state of PTH insufficiency.
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Affiliation(s)
- T Sikjaer
- Osteoporosis Clinic, Department of Internal Medicine and Endocrinology, MEA, Aarhus University Hospital, Tage-Hansensgade 2, 8000, Aarhus, Denmark,
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This is your brain on calcium: psychosis as the presentation of isolated hypoparathyroidism. Am J Emerg Med 2014; 32:945.e1-4. [PMID: 24742362 DOI: 10.1016/j.ajem.2014.01.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 01/18/2014] [Indexed: 11/22/2022] Open
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Saleem S, Aslam HM, Anwar M, Anwar S, Saleem M, Saleem A, Rehmani MAK. Fahr's syndrome: literature review of current evidence. Orphanet J Rare Dis 2013; 8:156. [PMID: 24098952 PMCID: PMC3853434 DOI: 10.1186/1750-1172-8-156] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Accepted: 10/05/2013] [Indexed: 01/02/2023] Open
Abstract
Fahr’s disease or Fahr’s syndrome is a rare, neurological disorder characterized by abnormal calcified deposits in basal ganglia and cerebral cortex. Calcified deposits are made up of calcium carbonate and calcium phosphate, and are commonly located in the Basal Ganglia, Thalamus, Hippocampus, Cerebral cortex, Cerebellar Subcortical white matter and Dentate Nucleus. Molecular genetics of this disease haven’t been studied extensively; hence evidence at the molecular and genetic level is limited. Fahr’s disease commonly affects young to middle aged adults. Etiology of this syndrome does not identify a specific agent but associations with a number of conditions have been noted; most common of which are endocrine disorders, mitochondrial myopathies, dermatological abnormalities and infectious diseases. Clinical manifestations of this disease incorporate a wide variety of symptoms, ranging from neurological symptoms of extrapyramidal system to neuropsychiatric abnormalities of memory and concentration to movement disorders including Parkinsonism, chorea and tremors amongst others. Diagnostic criteria for this disease has been formulated after modifications from previous evidence and can be stated briefly, it consist of bilateral calcification of basal ganglia, progressive neurologic dysfunction, absence of biochemical abnormalities, absence of an infectious, traumatic or toxic cause and a significant family history. Imaging modalities for the diagnosis include CT, MRI, and plain radiography of skull. Other investigations include blood and urine testing for hematologic and biochemical indices. Disease is as yet incurable but management and treatment strategies mainly focus on symptomatic relief and eradication of causative factors; however certain evidence is present to suggest that early diagnosis and treatment can reverse the calcification process leading to complete recovery of mental functions. Families with a known history of Fahr’s disease should be counseled prior to conception so that the birth of affected babies can be prevented. This review was written with the aim to remark on the current substantial evidence surrounding this disease.
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Affiliation(s)
- Shafaq Saleem
- Department of Medicine, Dow Medical College, DUHS, Karachi, Sindh, Pakistan.
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El Otmani H, Lahlou I, Raji L, Omari S, Belmansour Y, Moutaouakil F, Boulaajaj FZ, Mouden M, Gam I, Hakim K, El Moutawakil B, Rafai MA, Fadel H, Slassi I. [Striatopallidodentate calcinosis, hypoparathyroidism and neurological features: a case series study]. Rev Neurol (Paris) 2013; 169:495-501. [PMID: 23523016 DOI: 10.1016/j.neurol.2012.11.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2012] [Revised: 11/12/2012] [Accepted: 11/14/2012] [Indexed: 11/24/2022]
Abstract
INTRODUCTION The respective roles of hypocalcemia and intracerebral calcifications in the occurrence of various neurological manifestations in hypoparathyroidism is not entirely clear. Nevertheless, therapeutic and prognostic implications are important. OBJECTIVES We analyze the neurological clinical aspects observed in hypoparathyroidism and correlate them to the biological calcium abnormality and radiological CT scan findings. We also compare these results with data reported in the idiopathic form of striatopallidodentate calcinosis. PATIENTS The neurological clinical, CT scan findings and outcome have been retrospectively studied in patients recruited during 13 years (2000-2012) for neurological features associated with hypoparathyroidism or pseudohypoparathyroidism. RESULTS Twelve patients with primary hypoparathyroidism (n=5), secondary to thyroidectomy (n=4) and pseudohypoparathyroidism (n=3) were studied. The sex-ratio was 1 and mean age was 39 years. All patients had a tetany, 60% had epilepsy, associated in one patient with "benign" intracranial hypertension; 50% had behavioral changes. Response to calcium therapy was excellent for all these events. Moderate cognitive deficit was noted in three patients (25%), parkinsonism in two patients and hyperkinetic movement disorders in one other. These events were not responsive to calcium therapy and were more common in cases of extensive brain calcifications and in patients who had pseudohypoparathroidism. COMMENTS This study suggests that, in patients with hypoparathyroidism, epilepsy and psychiatric disorders are induced by hypocalcemia and reversible after its correction. Cognitive and extrapyramidal impairment seem to be related to the progressive extension of intracerebral calcification, particularly in patients with a late diagnosis. In patients with pseudohypoparathyroidism, this finding is different because of the contribution of other factors, specific to this disease.
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Affiliation(s)
- H El Otmani
- Service de neurologie, CHU d'Ibn Rochd, 1, rue des Hôpitaux, Casablanca, Maroc.
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Zisimopoulou V, Siatouni A, Tsoukalos G, Tavernarakis A, Gatzonis S. Extensive bilateral intracranial calcifications: a case of iatrogenic hypoparathyroidism. Case Rep Med 2013; 2013:932184. [PMID: 23509468 PMCID: PMC3595685 DOI: 10.1155/2013/932184] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 01/10/2013] [Accepted: 01/24/2013] [Indexed: 11/21/2022] Open
Abstract
This is a case of a 69-year-old male patient with long-standing iatrogenic hypoparathyroidism after total thyroidectomy. The clinical evaluation revealed mild neurological symptoms and excessive brain calcinosis. Intracranial calcification that affects structures other than the basal ganglia and the cerebellum is a rare manifestation of postoperative hypoparathyroidism. Detection of brain calcinosis in patients who had total thyroidectomy can motivate clinicians in further investigation of possible hypoparathyroidism with measurement of calcium and phosphorus serum levels.
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Affiliation(s)
- Vaso Zisimopoulou
- Department of Neurology, Evaggelismos Hospital, 45-47 Ipsilantou Street, 10676 Athens, Greece
| | - Anna Siatouni
- Department of Neurosurgery, Athens Medical School, Evaggelismos Hospital, 45-47 Ipsilantou Street, 10676 Athens, Greece
| | - Grigorios Tsoukalos
- Department of Radiology, Evaggelismos Hospital, 45-47 Ipsilantou Street, 10676 Athens, Greece
| | - Antonios Tavernarakis
- Department of Neurology, Evaggelismos Hospital, 45-47 Ipsilantou Street, 10676 Athens, Greece
| | - Stylianos Gatzonis
- Department of Neurosurgery, Athens Medical School, Evaggelismos Hospital, 45-47 Ipsilantou Street, 10676 Athens, Greece
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Kurozumi A, Okada Y, Arao T, Endou I, Matsumoto T, Tanaka Y. Extrapyramidal symptoms and advanced calcification of the basal ganglia in a patient with autosomal dominant hypocalcemia. Intern Med 2013; 52:2077-81. [PMID: 24042516 DOI: 10.2169/internalmedicine.52.8375] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Most cases of hypoparathyroidism with decreased parathyroid hormone (PTH) secretion, excluding secondary hypoparathyroidism, are considered to be idiopathic. We herein report a relatively rare case of hypoparathyroidism with extrapyramidal symptoms, including brachybasia and a frozen gait, caused by advanced basal ganglia calcification in a 64-year-old man with hypoparathyroidism. A DNA (deoxyribonucleic acid) analysis of blood samples obtained from the patient and his eldest daughter revealed autosomal dominant hypocalcemia (ADH) with mutations in the calcium-sensing receptor (CaSR) gene. In cases of chronic hypoparathyroidism, calcification of the basal ganglia is observed if the patient is not treated for a long period. However, extrapyramidal symptoms as a complication of hypoparathyroidism are relatively rare.
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Affiliation(s)
- Akira Kurozumi
- The First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Japan, Japan
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23
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Exacerbation of idiopathic paroxysmal kinesigenic dyskinesia in remission state caused by secondary hypoparathyroidism with hypocalcemia after thyroidectomy: evidence for ion channelopathy. Brain Dev 2012; 34:840-3. [PMID: 22361453 DOI: 10.1016/j.braindev.2012.01.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 01/25/2012] [Accepted: 01/31/2012] [Indexed: 11/21/2022]
Abstract
Most reported cases of paroxysmal kinesigenic dyskinesia (PKD) are idiopathic or familial; however, hypoparathyroidism is another unusual cause of secondary PKD. The pathomechanism of PKD remains poorly understood, and the association between idiopathic and secondary PKD remains an enigma, and has yet to be clearly elucidated. We recently encountered a patient with idiopathic PKD whose symptoms were aggravated by secondary hypoparathyroidism with hypocalcemia after having undergone a thyroidectomy. The patient's paroxysms were ameliorated by the normalization of serum calcium levels. The results discussed herein may provide support for the hypothesis that PKD is associated with neuronal ion regulation.
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Rizvi I, Ansari NA, Beg M, Shamim MD. Widespread intracranial calcification, seizures and extrapyramidal manifestations in a case of hypoparathyroidism. NORTH AMERICAN JOURNAL OF MEDICAL SCIENCES 2012; 4:369-72. [PMID: 22912949 PMCID: PMC3421919 DOI: 10.4103/1947-2714.99523] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Hypoparathyroidism can present with neurological complaints like seizures, parasthesias, depression, psychosis, extrapyramidal manifestations and features of raised intracranial pressure. Hypoparathyroidism and pseudohypoparathyroidism are the most common causes of pathological basal ganglia calcification. A 50 year male presented with generalized seizures and extrapyramidal features like tremors and rigidity. Investigations revealed that he had hypocalcemia, hyperphosphatemia and very low PTH levels, CT scan of head showed calcification of bilateral basal ganglia, cerebellum and subcortical white matter of frontal and parietal lobes. He showed remarkable recovery on restoration of normal serum calcium levels. Hypoparathyroidism should be kept in the differential diagnosis of patients presenting with seizures and extrapyramidal features.
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Affiliation(s)
- Imran Rizvi
- Department of Medicine, Jawaharlal Nehru Medical College, Aligarh, India
| | - Noor Alam Ansari
- Department of Medicine, Jawaharlal Nehru Medical College, Aligarh, India
| | - Mujahid Beg
- Department of Medicine, Jawaharlal Nehru Medical College, Aligarh, India
| | - Md. Dilawez Shamim
- Department of Medicine, Jawaharlal Nehru Medical College, Aligarh, India
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Affiliation(s)
- Paramdeep Singh
- Department of Radiodiagnosis, Dayanand Medical College and Hospital, Ludhiana, Punjab, India
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Anwar-ul-Haq, Ibrahim S, Gulab S, Saleem T, Ishaque S. Brain calcinosis and seizures in an adolescent boy. Clin Pediatr (Phila) 2010; 49:1160-3. [PMID: 20118093 DOI: 10.1177/0009922809348251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Pourfar M, Waters C. A rock solid case of parkinsonism. Mov Disord 2008. [DOI: 10.3109/9780203008454-98] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Su YC, Lin YM, Hou SW, Chen CC, Chong CF, Wang TL. Hypoparathyroidism-induced epilepsy: an overlooked cause. Am J Emerg Med 2006; 24:617-8. [PMID: 16938604 DOI: 10.1016/j.ajem.2005.12.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2005] [Accepted: 12/08/2005] [Indexed: 11/16/2022] Open
Affiliation(s)
- Yung-Cheng Su
- Emergency Department, Shin-Kong Wu Ho-Su Memorial Hospital, Taipei City 111, Taiwan
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McFarlane S, Doty C, Zehtabchi S, Casey G. Generalized seizure in a 30-year-old man with presumed intracranial hemorrhage: a case report. J Emerg Med 2000; 19:135-8. [PMID: 10903460 DOI: 10.1016/s0736-4679(00)00199-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A 30-year-old man presented to the emergency department of another institution with recurrent episodes of generalized tonic-clonic seizures. He was found to be hypocalcemic and was treated with an intravenous infusion of calcium followed by Dilantin. A computed tomography scan of the head was obtained, and the patient was transferred to our institution for neurosurgical evaluation and possible intervention of what was thought to be bilateral intracranial hemorrhages. After further evaluation at our institution, the diagnoses of hypoparathyroidism associated with hypocalcemic seizures and basal ganglia calcifications were established on both clinical and biochemical grounds. This case report discusses the clinical presentation, pathogenesis, diagnostic work-up, and management of hypoparathyroidism and associated seizures, highlighting the possible diagnostic and therapeutic pitfalls that are most pertinent to the emergency physician.
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Affiliation(s)
- S McFarlane
- Department of Emergency Medicine, Kings County Hospital Center and State University of New York, Health Science Center at Brooklyn, Brooklyn, NY 11203, USA
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Hull KL, Fathimani K, Sharma P, Harvey S. Calcitropic peptides: neural perspectives. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PART C, PHARMACOLOGY, TOXICOLOGY & ENDOCRINOLOGY 1998; 119:389-410. [PMID: 9827010 DOI: 10.1016/s0742-8413(98)00010-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
In mammals and higher vertebrates, calcitropic peptides are produced by peripheral endocrine glands: the parathyroid gland (PTH), thyroid or ultimobranchial gland (calcitonin) and the anterior pituitary gland (growth hormone and prolactin). These hormones are, however, also found in the neural tissues of lower vertebrates and invertebrates that lack these endocrine organs, suggesting that neural tissue may be an ancestral site of calcitropic peptide synthesis. Indeed, the demonstration of CNS receptors for these calcitropic peptides and their induction of neurological actions suggest that these hormones arose as neuropeptides. Neural and neuroendocrine roles of some of these calcitropic hormones (calcitonin and parathyroid hormone) and related peptides (calcitonin gene related peptide, stanniocalcin and parathyroid hormone related peptide) are thus the focus of this review.
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Affiliation(s)
- K L Hull
- Department of Physiology, University of Alberta, Edmonton, Canada
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