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Koffas S, Pantelis AG, Lapatsanis DP. Hypocalcemia in the Immediate Postoperative Period Following Metabolic Bariatric Surgery - Hype or Harm? Obes Surg 2024; 34:2530-2536. [PMID: 38833132 DOI: 10.1007/s11695-024-07312-3] [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: 10/08/2023] [Revised: 05/19/2024] [Accepted: 05/23/2024] [Indexed: 06/06/2024]
Abstract
PURPOSE Hypocalcemia post-metabolic bariatric surgery (MBS) is a known long-term complication after hypoabsorptive procedures. However, data on immediate postoperative calcium are limited. Our aim was to evaluate the prevalence of hypocalcemia on the 1st postoperative day after MBS and correlate it with potential associated factors. MATERIALS AND METHODS We analyzed data from all consecutive index MBS over 1 year. We collected data on demographics and on preoperative and postoperative values of serum calcium (TC), albumin, adjusted calcium (AC-Payne formula), magnesium, phosphorus, preoperative vitamin-D, and postoperative 24-h urine output, intravenous fluids (IVF), bolus intravenous furosemide, and creatine phosphokinase (CPK). Continuous data are expressed as means ± SD (range). Categorical data are presented as frequencies (%). Linear regression was implemented to designate potential correlations. RESULTS The cohort included 86 patients (58.1% females). The mean preoperative TC was 9.4mg/dL ± 0.4 (8.5-10.5) and mean postoperative TC 7.8mg/dL ± 0.6 (6.3-9.3, 17.0% decrease). The mean preoperative AC was 10.1mg/dL ± 0.4 (9.2-11.2) and mean postoperative AC 8.5mg/dL ± 0.6 (7.0-10.0, 15.8% decrease). Seventy-three patients (84.8%) had abnormally low TC (< 8.5mg/dL), and 43 (50%) abnormally low AC. There was only weak correlation between postoperative TC and AC with magnesium (r = 0.258), phosphorus (r = 0.269), vitamin-D (-0.163), 24-h urine output (r = -0.168), IVF (r = -0.237), bolus furosemide (r = 0.155), and mean operative time (r = 0.010). CONCLUSIONS In our cohort of patients, hypocalcemia was a real problem but we did not find any significant correlation with the examined factors. Further studies are warranted to validate our findings and investigate other potential correlations.
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Affiliation(s)
- Stefanos Koffas
- 4th Department of General Surgery, Evaggelismos General Hospital of Athens, Ipsilantou 45-47, 106 76, Athens, Greece
| | - Athanasios G Pantelis
- Obesity and Metabolic Disorders Surgical Department, Athens Medical Group Psychiko Clinic, 1 Andersen Str., 115 25, Athens, Greece.
| | - Dimitris P Lapatsanis
- Obesity and Metabolic Disorders Surgical Department, Athens Medical Group Psychiko Clinic, 1 Andersen Str., 115 25, Athens, Greece
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Schmidt M, Steinbach D, Federbusch M, Tönjes A, Isermann B, Kaiser T, Eckelt F. Evidence-based cutoffs for total and adjusted calcium: a major factor in detecting severe hypo- and hypercalcemia. Clin Chem Lab Med 2024; 62:1367-1375. [PMID: 38095218 DOI: 10.1515/cclm-2023-0805] [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: 07/27/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Abstract
OBJECTIVES Severe hypo- and hypercalcemia are common and urgent treatment is recommended. Free calcium (fCa) is the gold standard but needs blood gas tests with challenging preanalytics. Total calcium (tCa) and calculated adjusted calcium (aCa) are readily available, but their interpretation is hampered by identical tCa and aCa cutoffs, laborious local aCa calculation and difficult comparability of calcium biomarkers. METHODS Laboratory results from University Medicine Leipzig were evaluated over a five-year period (236,274 patients). A local aCa equation was derived by linear least squares regression, the agreement between fCa, tCa and aCa assessed with Cohen's κ and decision thresholds derived by this indirect method. RESULTS The local aCa equation was created from data of 9,756 patients, each with one paired measurement of tCa, fCa and albumin. Derived aCa cutoffs (1.95/3.15 mmol/L) differ markedly from derived tCa cutoffs (1.6/2.9 mmol/L) and severe hypo- and hypercalcemia can be more accurately assessed by aCa (κ=0.489, 0.812) than by tCa (κ=0.445, 0.744). Comparing our approach to standard care (tCa, literature cutoff), a total 3,250 of 3,680 (88.3 %) misclassified measurements were correctly classified when using aCa with evidence-based cutoffs. CONCLUSIONS Optimized cutoffs for aCa and tCa hold great potential for improved patient care. Locally derived aCa equations differ mostly in the chosen mean normal calcium and provide minimal overall improvement, but entail a close examination of the used cutoffs before application.
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Affiliation(s)
- Maria Schmidt
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Leipzig Medical Center, Leipzig, Germany
| | - Daniel Steinbach
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Leipzig Medical Center, Leipzig, Germany
| | - Martin Federbusch
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Leipzig Medical Center, Leipzig, Germany
| | - Anke Tönjes
- Department of Endocrinology, Nephrology, Rheumatology, University Leipzig Medical Center, Leipzig, Germany
| | - Berend Isermann
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Leipzig Medical Center, Leipzig, Germany
| | - Thorsten Kaiser
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Leipzig Medical Center, Leipzig, Germany
- Institute for Laboratory Medicine, Microbiology and Pathobiochemistry, University Hospital Ostwestfalen-Lippe (UK-OWL), Campus Klinikum Lippe, Lippe, Germany
| | - Felix Eckelt
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Leipzig Medical Center, Leipzig, Germany
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
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3
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Liu Y, Zheng Y, Ding S. The correlation between serum calcium levels and prognosis in patients with severe acute osteomyelitis. Front Immunol 2024; 15:1378730. [PMID: 38903514 PMCID: PMC11186995 DOI: 10.3389/fimmu.2024.1378730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Accepted: 05/27/2024] [Indexed: 06/22/2024] Open
Abstract
Objective To explore the relationship between serum calcium levels and the prognosis of severe acute osteomyelitis, and to assess the effectiveness of calcium levels in prognostic evaluation. Methods Relevant patient records of individuals diagnosed with severe acute osteomyelitis were obtained for this retrospective study from the Medical Information Mart for Intensive Care (MIMIC-IV). The study aimed to assess the impact of different indicators on prognosis by utilizing COX regression analysis. To enhance prognostic prediction for critically ill patients, a nomogram was developed. The discriminatory capacity of the nomogram was evaluated using the Area Under the Curve (AUC) of the Receiver Operating Characteristic (ROC) curve, in addition to the calibration curve. Result The study analyzed a total of 1,133 cases of severe acute osteomyelitis, divided into the survivor group (1,025 cases) and the non-survivor group (108 cases). Significant differences were observed between the two groups in terms of age, hypertension, sepsis, renal injury, and various laboratory indicators, including WBC, PLT, Ca2+, CRP, hemoglobin, albumin, and creatinine (P<0.05). However, no significant differences were found in race, gender, marital status, detection of wound microbiota, blood sugar, lactate, and ALP levels. A multivariate COX proportional hazards model was constructed using age, hypertension, sepsis, Ca2+, creatinine, albumin, and hemoglobin as variables. The results revealed that hypertension and sepsis had a significant impact on survival time (HR=0.514, 95% CI 0.339-0.779, P=0.002; HR=1.696, 95% CI 1.056-2.723, P=0.029). Age, hemoglobin, Ca2+, albumin, and creatinine also showed significant effects on survival time (P<0.05). However, no statistically significant impact on survival time was observed for the other variables (P>0.05). To predict the survival time, a nomogram was developed using the aforementioned indicators and achieved an AUC of 0.841. The accuracy of the nomogram was further confirmed by the ROC curve and calibration curve. Conclusion According to the findings, this study establishes that a reduction in serum calcium levels serves as a distinct and standalone predictor of mortality among individuals diagnosed with severe acute osteomyelitis during their stay in the Intensive Care Unit (ICU) within a span of two years.
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Affiliation(s)
- Yunlong Liu
- Department of Pediatric Surgery, Women and Children’s Hospital Affiliated to Ningbo University, Ningbo, Zhejiang, China
| | - Yan Zheng
- Department of School of Foundation, Zhejiang Pharmaceutical University, Ningbo, China
| | - Sheng Ding
- Department of Pediatric Surgery, Women and Children’s Hospital Affiliated to Ningbo University, Ningbo, Zhejiang, China
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4
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Li X, He W, Song Q, Ding Q, Zhang X, Zeng Z, Deng W, Deng G, Guan L, Hong W, Liu Y, Shu F, Xu L, Tan N, Ma J, Jiang L. The Prognostic Value of Serum Calcium Levels in Elderly Dilated Cardiomyopathy Patients. Glob Heart 2024; 19:25. [PMID: 38434155 PMCID: PMC10906334 DOI: 10.5334/gh.1304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 02/05/2024] [Indexed: 03/05/2024] Open
Abstract
Background It is unclear whether serum calcium on admission is associated with clinical outcomes in dilated cardiomyopathy (DCM). In this study, we conducted a retrospective study spanning a decade to investigate the prognostic value of baseline calcium in elderly patients with DCM. Methods A total of 1,089 consecutive elderly patients (age ≥60 years) diagnosed with DCM were retrospectively enrolled from January 2010 to December 2019. Univariate and multivariate analyses were performed to investigate the association of serum calcium with their clinical outcomes. Results In this study, the average age of the subjects was 68.36 ± 6.31 years. Receiver operating characteristic (ROC) curve analysis showed that serum calcium level had a great sensitivity and specificity for predicting in-hospital death, with an AUC of 0.732. Kaplan-Meier survival analysis showed that patients with a serum calcium >8.62 mg/dL had a better prognosis than those with a serum calcium ≤8.62 mg/dL (log-rank χ2 40.84, p < 0.001). After adjusting for several common risk factors, a serum calcium ≤8.62 mg/dL was related to a higher risk of long-term mortality (HR: 1.449; 95% CI: 1.115~1.882; p = 0.005). Conclusions Serum calcium level could be served as a simple and affordable tool to evaluate patients' prognosis in DCM.
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Affiliation(s)
- Xinyi Li
- School of Medicine, South China University of Technology, Guangzhou 510006, China
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Wenfei He
- Department of Cardiology, Guangdong Provincial People’s Hospital’s Nanhai Hospital, The Second People’s Hospital of Nanhai District, Foshan 528000, China
| | - Qiqi Song
- School of Medicine, South China University of Technology, Guangzhou 510006, China
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Qingshan Ding
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Xiaonan Zhang
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Zhigang Zeng
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Weiping Deng
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Gang Deng
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Lichang Guan
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Wanzi Hong
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Yaoxin Liu
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Fen Shu
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Lishu Xu
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Ning Tan
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Jinjin Ma
- School of Medicine, South China University of Technology, Guangzhou 510006, China
| | - Lei Jiang
- School of Medicine, South China University of Technology, Guangzhou 510006, China
- Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
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Kjøller TS, Lind BS, Schwarz P, Jørgensen HL. Measurement of plasma total calcium before plasma free ionized calcium - a possibility with affordable pitfalls. Scand J Clin Lab Invest 2024; 84:38-43. [PMID: 38381053 DOI: 10.1080/00365513.2024.2317756] [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: 10/20/2023] [Accepted: 02/05/2024] [Indexed: 02/22/2024]
Abstract
Free ionized calcium (fCa) is considered the gold standard for assessing calcium status in patients, but it is relatively expensive and is associated with several preanalytical and analytical error sources. We investigated the feasibility of using a reflex test that involves first measuring total calcium (tCa) and if out of reference range, then measure fCa, with expectation of reducing the number of fCa measurements. We used data from 1815 unique patients with concurrent measurement of fCa, tCa and albumin adjusted calcium (aCa). Patients were stratified by albumin level, and the association of fCa to tCa and aCa respectively was assessed with linear regression. The regression analysis showed the best linearity for tCa and aCa at albumin <35 g/L (R2: 0.80-0.90), and the poorest at albumin >40 g/L (R2: tCa 0.58; aCa 0.59). We examined the accuracy of hypo- and hypercalcemia classifications for tCa, aCa and the reflex test. aCa had more misclassifications of hypo- and hypercalcemia than tCa, with respectively 25% and 21%. Implementation of the reflex test would correct any false hypo- or hypercalcemia classified by tCa, leaving only false negative results corresponding to 9% of all tCa measurements. False negative results were on average 0.04 mmol/L above or below the reference range of fCa. Implementation of the reflex test reduces the number of fCa by 68% without major errors diagnosing hyper- or hypocalcemia.
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Affiliation(s)
- Tobias Skou Kjøller
- Department of Clinical Biochemistry, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
| | - Bent S Lind
- Department of Clinical Biochemistry, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
| | - Peter Schwarz
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
- Department of Endocrinology, Rigshospitalet, Copenhagen, Denmark
| | - Henrik L Jørgensen
- Department of Clinical Biochemistry, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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6
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Milat F, Ramchand SK, Herath M, Gundara J, Harper S, Farrell S, Girgis CM, Clifton-Bligh R, Schneider HG, De Sousa SMC, Gill AJ, Serpell J, Taubman K, Christie J, Carroll RW, Miller JA, Grossmann M. Primary hyperparathyroidism in adults-(Part I) assessment and medical management: Position statement of the endocrine society of Australia, the Australian & New Zealand endocrine surgeons, and the Australian & New Zealand bone and mineral society. Clin Endocrinol (Oxf) 2024; 100:3-18. [PMID: 34931708 DOI: 10.1111/cen.14659] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 11/30/2021] [Accepted: 12/09/2021] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To formulate clinical consensus recommendations on the presentation, assessment, and management of primary hyperparathyroidism (PHPT) in adults. METHODS Representatives from relevant Australian and New Zealand Societies used a systematic approach for adaptation of guidelines (ADAPTE) to derive an evidence-informed position statement addressing nine key questions. RESULTS PHPT is a biochemical diagnosis. Serum calcium should be measured in patients with suggestive symptoms, reduced bone mineral density or minimal trauma fractures, and in those with renal stones. Other indications are detailed in the manuscript. In patients with hypercalcaemia, intact parathyroid hormone, 25-hydroxy vitamin D, phosphate, and renal function should be measured. In established PHPT, assessment of bone mineral density, vertebral fractures, urinary tract calculi/nephrocalcinosis and quantification of urinary calcium excretion is warranted. Parathyroidectomy is the only definitive treatment and is warranted for all symptomatic patients and should be considered for asymptomatic patients without contraindications to surgery and with >10 years life expectancy. In patients who do not undergo surgery, we recommend annual evaluation for disease progression. Where the diagnosis is not clear or the risk-benefit ratio is not obvious, multidisciplinary discussion and formulation of a consensus management plan is appropriate. Genetic testing for familial hyperparathyroidism is recommended in selected patients. CONCLUSIONS These clinical consensus recommendations were developed to provide clinicians with contemporary guidance on the assessment and management of PHPT in adults. It is anticipated that improved health outcomes for individuals and the population will be achieved at a decreased cost to the community.
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Affiliation(s)
- Frances Milat
- Department of Endocrinology, Monash Health, Victoria, Australia
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Victoria, Australia
- Department of Medicine, Nursing & Health Sciences, Monash University, Victoria, Australia
| | - Sabashini K Ramchand
- Department of Endocrinology, Austin Health, Victoria, Australia
- Department of Medicine, Austin Health, University of Melbourne, Victoria, Australia
| | - Madhuni Herath
- Department of Endocrinology, Monash Health, Victoria, Australia
- Centre for Endocrinology and Metabolism, Hudson Institute of Medical Research, Victoria, Australia
- Department of Medicine, Nursing & Health Sciences, Monash University, Victoria, Australia
| | - Justin Gundara
- Department of Surgery, Redland Hospital, Metro South and Faculty of Medicine, University of Queensland, Australia
- Department of Surgery, Logan Hospital, Metro South and School of Medicine and Dentistry, Griffith University, Queensland, Australia
| | - Simon Harper
- Department of General Surgery, Wellington Regional Hospital, Wellington, New Zealand
- Department of Surgery, University of Otago, Wellington, New Zealand
| | - Stephen Farrell
- Department of Surgery, St Vincent's Hospital, Victoria, Australia
- Department of Surgery, Austin Hospital, Victoria, Australia
- Department of Surgery, Royal Children's Hospital, Victoria, Australia
- Department of Surgery, University of Melbourne, Victoria, Australia
| | - Christian M Girgis
- Department of Diabetes and Endocrinology, Westmead Hospital, New South Wales, Australia
- Department of Endocrinology, Royal North Shore Hospital, St Leonards, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, New South Wales, Australia
| | - Roderick Clifton-Bligh
- Department of Endocrinology, Royal North Shore Hospital, St Leonards, New South Wales, Australia
- Faculty of Medicine and Health, University of Sydney, New South Wales, Australia
- Kolling Institute, University of Sydney, New South Wales, Australia
| | - Hans G Schneider
- Clinical Biochemistry Unit, Alfred Pathology Service, Alfred Health, Victoria, Australia
- Department of Endocrinology, Alfred Hospital, Victoria, Australia
- Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Victoria, Australia
| | - Sunita M C De Sousa
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, Australia
- South Australian Adult Genetics Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, South Australia, Australia
| | - Anthony J Gill
- Faculty of Medicine and Health, University of Sydney, New South Wales, Australia
- Cancer Diagnosis and Pathology Group, Kolling Institute of Medical Research, Royal North Shore Hospital, St Leonards, New South Wales, Australia
- NSW Health Pathology, Department of Anatomical Pathology, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Jonathan Serpell
- Department of General Surgery, The Alfred Hospital, Victoria, Australia
- Monash University Department of Endocrine Surgery, Victoria, Australia
| | - Kim Taubman
- Department of Medical Imaging, St Vincent's Hospital, Victoria, Australia
- Department of Endocrinology, St Vincent's Hospital, Victoria, Australia
- Department of Medicine, University of Melbourne, Victoria, Australia
| | | | - Richard W Carroll
- Endocrine, Diabetes, and Research Centre, Wellington Regional Hospital, Wellington, New Zealand
| | - Julie A Miller
- Department of Surgery, University of Melbourne, Victoria, Australia
- Department of Surgery, The Royal Melbourne Hospital, Victoria, Australia
- Epworth Hospital Network, Victoria, Australia
| | - Mathis Grossmann
- Department of Endocrinology, Austin Health, Victoria, Australia
- Department of Medicine, Austin Health, University of Melbourne, Victoria, Australia
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Wynne Z, Falat C. Disorders of Calcium and Magnesium. Emerg Med Clin North Am 2023; 41:833-848. [PMID: 37758427 DOI: 10.1016/j.emc.2023.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
This review will discuss the importance and homeostasis of calcium and magnesium in the human body, as well as the implications and treatment of disordered calcium and magnesium. With calcium and magnesium often considered to be the "forgotten cations" in medicine, it is our hope that this review will lead providers to evaluate for and effectively manage these electrolyte disorders in the emergency department.
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Affiliation(s)
- Zachary Wynne
- Department of Emergency Medicine, University of Maryland Medical Center, 110 South Paca Street, 6th Floor Suite 200, Baltimore, MD 21201, USA
| | - Cheyenne Falat
- Department of Emergency Medicine, University of Maryland Medical Center, 110 South Paca Street, 6th Floor Suite 200, Baltimore, MD 21201, USA.
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Magagnoli L, Cozzolino M, Caskey FJ, Evans M, Torino C, Porto G, Szymczak M, Krajewska M, Drechsler C, Stenvinkel P, Pippias M, Dekker FW, de Rooij ENM, Wanner C, Chesnaye NC, Jager KJ. Association between CKD-MBD and mortality in older patients with advanced CKD-results from the EQUAL study. Nephrol Dial Transplant 2023; 38:2562-2575. [PMID: 37230954 PMCID: PMC10615632 DOI: 10.1093/ndt/gfad100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Indexed: 05/27/2023] Open
Abstract
BACKGROUND Chronic kidney disease-mineral and bone disorder (CKD-MBD) is a common complication of CKD; it is associated with higher mortality in dialysis patients, while its impact in non-dialysis patients remains mostly unknown. We investigated the associations between parathyroid hormone (PTH), phosphate and calcium (and their interactions), and all-cause, cardiovascular (CV) and non-CV mortality in older non-dialysis patients with advanced CKD. METHODS We used data from the European Quality study, which includes patients aged ≥65 years with estimated glomerular filtration rate ≤20 mL/min/1.73 m2 from six European countries. Sequentially adjusted Cox models were used to assess the association between baseline and time-dependent CKD-MBD biomarkers and all-cause, CV and non-CV mortality. Effect modification between biomarkers was also assessed. RESULTS In 1294 patients, the prevalence of CKD-MBD at baseline was 94%. Both PTH [adjusted hazard ratio (aHR) 1.12, 95% confidence interval (CI) 1.03-1.23, P = .01] and phosphate (aHR 1.35, 95% CI 1.00-1.84, P = .05), but not calcium (aHR 1.11, 95% CI 0.57-2.17, P = .76), were associated with all-cause mortality. Calcium was not independently associated with mortality, but modified the effect of phosphate, with the highest mortality risk found in patients with both hypercalcemia and hyperphosphatemia. PTH level was associated with CV mortality, but not with non-CV mortality, whereas phosphate was associated with both CV and non-CV mortality in most models. CONCLUSIONS CKD-MBD is very common in older non-dialysis patients with advanced CKD. PTH and phosphate are independently associated with all-cause mortality in this population. While PTH level is only associated with CV mortality, phosphate seems to be associated with both CV and non-CV mortality.
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Affiliation(s)
- Lorenza Magagnoli
- University of Milan, Department of Health Sciences, Milan, Italy
- ASST Santi Paolo e Carlo, Renal Division, Milan, Italy
| | - Mario Cozzolino
- University of Milan, Department of Health Sciences, Milan, Italy
- ASST Santi Paolo e Carlo, Renal Division, Milan, Italy
| | - Fergus J Caskey
- University of Bristol, Population Health Sciences, Bristol, UK
- North Bristol NHS Trust, Renal Unit, Bristol, UK
| | - Marie Evans
- Karolinska Institutet, Department of Clinical Intervention and Technology (CLINTEC), Stockholm, Sweden
| | - Claudia Torino
- Istituto di Fisiologia Clinica Consiglio Nazionale delle Ricerche (IFC-CNR), Clinical Epidemiology and Pathophysiology of Renal Diseases and Hypertension, Reggio Calabria, Italy (IT)
| | - Gaetana Porto
- G.O.M., Azienda Ospedaliera Bianchi-Melacrino-Morelli, Reggio Calabria, Italy
| | - Maciej Szymczak
- Wroclaw Medical University, Department of Nephrology and Transplantation Medicine, Wroclaw, Poland
| | - Magdalena Krajewska
- Wroclaw Medical University, Department of Nephrology and Transplantation Medicine, Wroclaw, Poland
| | | | - Peter Stenvinkel
- Karolinska Institutet, Department of Clinical Intervention and Technology (CLINTEC), Stockholm, Sweden
| | - Maria Pippias
- University of Bristol, Population Health Sciences, Bristol, UK
- North Bristol NHS Trust, Renal Unit, Bristol, UK
| | - Friedo W Dekker
- Leiden University Medical Center, Department of Clinical Epidemiology, Leiden, The Netherlands
| | - Esther N M de Rooij
- Leiden University Medical Center, Department of Clinical Epidemiology, Leiden, The Netherlands
| | - Christoph Wanner
- University Hospital Würzburg, Division of Nephrology, Würzburg, Germany
| | - Nicholas C Chesnaye
- Amsterdam UMC location AMC, Medical Informatics, ERA Registry, Amsterdam, The Netherlands
- Amsterdam Public Health Research Institute, Quality of Care, Amsterdam, The Netherlands
| | - Kitty J Jager
- Amsterdam UMC location AMC, Medical Informatics, ERA Registry, Amsterdam, The Netherlands
- Amsterdam Public Health Research Institute, Quality of Care, Amsterdam, The Netherlands
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9
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De Vincentis S, Del Sindaco G, Pagnano A, Brigante G, Moretti A, Zirilli L, Rochira V, Simoni M, Mantovani G, Madeo B. Application of calcium-to-phosphorus (Ca/P) ratio in the diagnosis of pseudohypoparathyroidism: another piece in the puzzle of diagnosis of Ca-P metabolism disorders. Front Endocrinol (Lausanne) 2023; 14:1268704. [PMID: 37854194 PMCID: PMC10580082 DOI: 10.3389/fendo.2023.1268704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 09/11/2023] [Indexed: 10/20/2023] Open
Abstract
Objective The serum calcium (Ca)-to-phosphorus (P) ratio has been proposed to identify patients with primary hyperparathyroidism and chronic hypoparathyroidism (HPT), but it has never been tested in pseudohypoparathyroidism (PHP). The aim of this study was to test the performance of Ca/P ratio in PHP diagnosis compared with that in healthy subjects and patients with HPT for differential diagnosis. Design A retrospective, cross-sectional, and observational study was carried out. Methods Serum Ca, P, creatinine, parathyroid hormone (PTH), and albumin were collected. Ca and P were expressed in mmol/L. Ca/P diagnostic performance was evaluated by receiver operating characteristic curve, sensitivity, specificity, and accuracy. Results A total of 60 patients with PHP, 60 patients with HPT, and 120 controls were enrolled. The Ca/P ratio was lower in patients with PHP and HPT than that in controls (p < 0.0001). The cutoff of 1.78 (2.32 if Ca and P measured in mg/dL) for Ca/P ratio could identify patients with PHP and HPT among the entire cohort (sensitivity and specificity of 76%). No valid cutoff of Ca/P was found to distinguish patients with PHP from patients with HPT; in this case, PTH above 53.0 ng/dL identified patients with PHP (sensitivity and specificity of 100%). The index (Ca/P × PTH) above 116 ng/L recognized patients with PHP from controls (sensitivity of 84.7% and specificity of 87.4%), whereas (Ca/P × PTH) below 34 ng/L recognized patients with HPT from controls (sensitivity of 88.9% and specificity of 90.8%). Conclusions The Ca/P ratio below 1.78 (2.32 CU) is highly accurate to identify patients with PHP and HPT, although it is not reliable to differentiate these two conditions. The index (Ca/P × PTH) is excellent to specifically recognize PHP or HPT from healthy subjects.
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Affiliation(s)
- Sara De Vincentis
- Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria di Modena Policlinico di Modena, Ospedale Civile di Baggiovara, Modena, Italy
- Clinical and Experimental Medicine PhD Program, University of Modena and Reggio Emilia, Modena, Italy
| | - Giulia Del Sindaco
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Angela Pagnano
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Giulia Brigante
- Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria di Modena Policlinico di Modena, Ospedale Civile di Baggiovara, Modena, Italy
| | - Antonio Moretti
- Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Lucia Zirilli
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria di Modena Policlinico di Modena, Ospedale Civile di Baggiovara, Modena, Italy
| | - Vincenzo Rochira
- Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria di Modena Policlinico di Modena, Ospedale Civile di Baggiovara, Modena, Italy
| | - Manuela Simoni
- Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria di Modena Policlinico di Modena, Ospedale Civile di Baggiovara, Modena, Italy
| | - Giovanna Mantovani
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
- Endocrinology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Bruno Madeo
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria di Modena Policlinico di Modena, Ospedale Civile di Baggiovara, Modena, Italy
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10
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Ropero-Luis G, López-Sampalo A, Sanz-Cánovas J, Ruiz-Cantero A, Gómez-Huelgas R. Characteristics of hospitalized patients with hypercalcemia in the province of Malaga: a longitudinal, retrospective, multicenter study. Rev Clin Esp 2023; 223:486-492. [PMID: 37532015 DOI: 10.1016/j.rceng.2023.07.009] [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] [Indexed: 08/04/2023]
Abstract
BACKGROUND AND OBJECTIVE There are limited studies analyzing hypercalcemia in hospitalized patients. Our objectives were to describe the clinical characteristics of hospitalized patients with hypercalcemia, estimate its prevalence in the hospital setting, analyze the rate of correction of hypercalcemia, and identify prognostic variables. MATERIALS AND METHODS Observational, longitudinal, retrospective, and bicentric study. Adult patients admitted to two hospitals in Málaga (2014-2018) with a diagnosis of hypercalcemia were included. The minimum follow-up was 2 years or until death. RESULTS A total of 205 patients with hypercalcemia were included (incidence: 0.13%). The mean age (SD) was 68.2 (13.1) years, with a predominance of males (55.1%). The median (IQR) serum calcium at admission was 13.1 (11.8-14.6) mg/dl. The most common etiologies were neoplasms (75.1%), primary hyperparathyroidism, and medications (both 8.8%). The median (IQR) follow-up period was 5.1 (1.7-60.3) weeks. The most commonly used treatments were fluid therapy (86.8%), loop diuretics (70.9%), bisphosphonates (60.7%), and glucocorticoids (46.2%). The rate of correction of hypercalcemia was 65.2%, with a median (IQR) of 6 (3-10) days. The mortality rate was 81.5%. The median (95% CI) survival was 5.1 (3-7.3) weeks. Factors associated with higher mortality were advanced age, neoplastic etiology, serum calcium at admission, and failure to correct hypercalcemia. CONCLUSIONS Hypercalcemia in hospitalized patients is mainly due to neoplastic processes and is associated with high mortality. We observed a low rate of adherence to recommendations for the management of hypercalcemia.
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Affiliation(s)
- G Ropero-Luis
- Unidad de Gestión Clínica de Medicina Interna y Especialidades Médicas, Hospital de la Serranía, Ronda, Málaga, Spain; Facultad de Medicina, Universidad de Málaga, Málaga, Spain.
| | - A López-Sampalo
- Servicio de Medicina Interna, Hospital Regional Universitario de Málaga, Málaga, Spain
| | - J Sanz-Cánovas
- Servicio de Medicina Interna, Hospital Regional Universitario de Málaga, Málaga, Spain
| | - A Ruiz-Cantero
- Unidad de Gestión Clínica de Medicina Interna y Especialidades Médicas, Hospital de la Serranía, Ronda, Málaga, Spain; Facultad de Medicina, Universidad de Málaga, Málaga, Spain
| | - R Gómez-Huelgas
- Facultad de Medicina, Universidad de Málaga, Málaga, Spain; Servicio de Medicina Interna, Hospital Regional Universitario de Málaga, Málaga, Spain; Instituto de Investigación Biomédica de Málaga (IBIMA - Plataforma BIONAND), Spain; CIBER Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, Madrid, Spain
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11
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Phylactou M, Comninos AN, Salih A, Labib M, Eng PC, Clarke SA, Moore P, Tan T, Cegla J, Dhillo WS, Abbara A. Derivation and comparison of formulae for the adjustment of total calcium. Front Endocrinol (Lausanne) 2023; 14:1070443. [PMID: 37251673 PMCID: PMC10213740 DOI: 10.3389/fendo.2023.1070443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 04/18/2023] [Indexed: 05/31/2023] Open
Abstract
Background Free ionized calcium (Ca2+) is the biologically active component of total calcium (TCa) and hence responsible for its biological action. TCa is routinely adjusted for albumin using several formulae (e.g. James, Orell, Payne and Berry) to more closely reflect Ca2+. Here, we derive a novel formula to estimate Ca2+ and compare its performance to established formulae. Methods Cohort for prediction of Ca2+: 2806 serum samples (TCa) taken contemporaneously with blood gas samples (Ca2+) at Imperial College Healthcare NHS Trust were used to derive formulae to estimate Ca2+ using multivariable linear regression. Cohort for prediction of PTH: Performance of novel and existing formulae to predict PTH in 5510 patients was determined by Spearman correlation. Results Ca2+ prediction Cohort: Adjusted calcium (r2 = 0.269) was less strongly associated with Ca2+, than TCa (r2 = 0.314). Prediction of Ca2+ from a newly derived formula incorporating TCa, potassium, albumin, and hematocrit had an improved r2 of 0.327, whereas inclusion of all available parameters increased the r2 further to 0.364. Of the established formulae, James performed best in predicting Ca2+ (r2 = 0.27). PTH prediction cohort: Berry resulted in higher whereas Orell in lower adjusted calcium levels. Prediction of PTH was strongest in the setting of hypercalcemia, with James having the highest Spearman correlation coefficient (+0.496) similar to including all parameters (+0.499). Conclusion Adjustment of calcium for albumin using established formulae does not always outperform unadjusted TCa in the reflection of Ca2+. Further prospective studies are needed to optimise adjustment of TCa and to establish bounds for validity.
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Affiliation(s)
- Maria Phylactou
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Alexander N. Comninos
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Ahmed Salih
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
| | - Marina Labib
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
| | - Pei Chia Eng
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Sophie A. Clarke
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Pope Moore
- Department of Clinical Biochemistry, North West London Pathology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Tricia Tan
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
- Department of Clinical Biochemistry, North West London Pathology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Jaimini Cegla
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
- Department of Clinical Biochemistry, North West London Pathology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Waljit S. Dhillo
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
| | - Ali Abbara
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, United Kingdom
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12
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Albert SG, Scott Isbell T. Reconsideration of "Albumin Corrected Total calcium" Determinations: Potential Errors in the Clinical Management of Disorders of Calcium Metabolism. Clin Chim Acta 2023; 544:117353. [PMID: 37076097 DOI: 10.1016/j.cca.2023.117353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 04/04/2023] [Accepted: 04/12/2023] [Indexed: 04/21/2023]
Abstract
BACKGROUND The formula, referenced in major textbooks, for albumin corrected calcium [Calcium(alb)] may not accurately depict ionized calcium [ICa]. We evaluated the accuracy of unadjusted calcium [Calcium(Unadjusted)] and [Calcium(alb)], and developed a protocol for local laboratory adjustment of calcium for albumin. METHODS Laboratory data were obtained from an electronic health record. Assessments were accuracy, false positive, and false negative rates. Clinical reliability was defined in "error zones" for calcium [Ca]: Zone A =Ca(normal), ICa(low) ; Zone B =Ca(low), ICa(normal) ; and Zone C =Ca(normal), ICa(high), Zone D=Ca(high), ICa(normal). RESULTS A linear regression from 468 laboratory tests was used to derive a formula for "revised corrected calcium" [Calcium (revised)] over a range of albumin concentrations where, [Calcium (revised)] = plasma calcium (mg/dl) + [(4- Albumin (g/d)L)]*(plasma calcium (mg/dl)*0.052)]. [Calcium(alb]] vs [Calcium(Unadjusted)] decreased zone B errors 12%, [95%CI;8-15%], vs 44% [95%CI;37-50%], p <0.001. However, [Calcium(alb]] vs [Calcium(Unadjusted)] increased zone A error (60%,[95%CI;42-78%], vs 7% [95%CI;1-13%], p <0.001). [Calcium (revised)] decreased zone A errors (15%, [95%CI;6-24%]) vs [Calcium(alb) ] (60% [95%CI;42-78%], p<0.001) and Zone D errors from 9% [95%CI;6-12%] to 2% [95%CI;1:5%, p<0.001]. CONCLUSIONS [Calcium(alb)] is unreliable in hypo- or hypercalcemia. We provide a protocol for locally derived correction of calcium for albumin.
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Affiliation(s)
- Stewart G Albert
- Department of Internal Medicine, Division of Endocrinology and Metabolism.
| | - T Scott Isbell
- Department of Pathology, Division of Laboratory Medicine. Saint Louis University School of Medicine
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13
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Minasi A, Andreadi A, Maiorino A, Giudice L, De Taddeo S, D'Ippolito I, de Guido I, Laitano R, Romano M, Ruotolo V, Magrini A, Di Daniele N, Rogliani P, Bellia A, Lauro D. Hypocalcemia is associated with adverse outcomes in patients hospitalized with COVID-19. Endocrine 2023; 79:577-586. [PMID: 36350462 PMCID: PMC9643940 DOI: 10.1007/s12020-022-03239-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Accepted: 10/19/2022] [Indexed: 11/11/2022]
Abstract
PURPOSE Calcium ions are involved in the regulation of several cellular processes and may also influence viral replication. Hypocalcemia has been frequently reported during infectious diseases and in critically ill patients, including also COVID-19 patients, significantly related with the pro-inflammatory state and mortality. The aim of this study is to investigate the prevalence of hypocalcemia at admission in patients hospitalized for COVID-19 (Coronavirus disease 2019) and to evaluate association of hypocalcemia with in-hospital COVID-19 outcomes. METHODS Retrospective analysis on 118 consecutive patients, hospitalized for COVID-19 between March and May 2020. Clinical characteristics, inflammation markers, biochemical routine and mineral metabolism parameters at admission were collected. Hypocalcemia was defined as total serum calcium <2.2 mmol/L. Population was stratified by tertiles of total serum calcium. Primary outcome was the composite of in-hospital death or admission to intensive care unit (ICU). Secondary outcomes included in-hospital death, admission to ICU and need for non-invasive ventilation as separate events. Associations were tested by logistic regression and Cox-regression analysis with survival curves. RESULTS Overall prevalence of hypocalcemia was 76.6%, with just 6.7% of patients reporting levels of 25-(OH)-vitamin D > 30 ng/ml. Total serum calcium was inversely related with selected inflammatory biomarkers (p < 0.05) and poorer outcome of COVID-19 during hospitalization. Lower tertile of total calcium (≤2.02 mmol/L) had increased risk of in-hospital mortality (HR 2.77; 1.28-6.03, p = 0.01) compared with other groups. CONCLUSION Total serum calcium detected on admission is inversely related with proinflammatory biomarkers of severe COVID-19 and is useful to better define risk stratification for adverse in-hospital outcome.
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Affiliation(s)
- Alessandro Minasi
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Aikaterini Andreadi
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Alessio Maiorino
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Luca Giudice
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Sofia De Taddeo
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Ilenia D'Ippolito
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Ilaria de Guido
- Department of Experimental Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Respiratory Medicine, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Rossella Laitano
- Department of Experimental Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Respiratory Medicine, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Maria Romano
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Valeria Ruotolo
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Andrea Magrini
- Department of Biomedicine and Prevention, University of Rome "Tor Vergata", Rome, Italy
| | - Nicola Di Daniele
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
| | - Paola Rogliani
- Department of Experimental Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Respiratory Medicine, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Alfonso Bellia
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy
| | - Davide Lauro
- Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy.
- Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy.
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14
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Bancal C, Salipante F, Hannas N, Lumbroso S, Cavalier E, De Brauwere DP. A new approach to assessing calcium status via a machine learning algorithm. Clin Chim Acta 2023; 539:198-205. [PMID: 36549640 DOI: 10.1016/j.cca.2022.12.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 12/16/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND AND AIMS Calcium plays a fundamental role in biological processes. Ionized calcium (Ca2+), is the biologically active fraction, but in practice total or corrected calcium assays are routinely used to determine calcium status. MATERIALS AND METHODS We retrospectively compared total and corrected calcium to assess the calcium status, with ionized calcium which is considered for now like the best indicator. To compensate for their lack of performance we created a machine learning algorithm to predict calcium status. RESULTS Corrected calcium performed less well than total calcium with 58% and 74% agreement, respectively, in our population. Total calcium was especially good for hypocalcemic samples: 93% agreement versus 45% for normocalcemic and 54% for hypercalcemic samples. Corrected calcium was especially good for hypercalcemic and normocalcemic samples: 90% and 84% agreement respectively versus 40% for hypocalcemic samples. Corrected calcium is mainly faulty in hypoalbuminemia, acid-base disorders, renal insufficiency, hyperphosphatemia, or inflammatory syndrome. With our ML algorithm, we obtained 81% correct classifications. Its main advantage is that its performance are not influenced by the variables studied or the calcium status. CONCLUSION In many situations, corrected calcium should not be used. Our ML algorithm may make a better assessment of calcium status than total calcium. Finally, if doubt, an ionized calcium assay should be performed.
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Affiliation(s)
- Candice Bancal
- Laboratoire de biochimie et biologie moléculaire, CHU Nîmes, France.
| | - Florian Salipante
- Laboratoire de biostatistique, épidémiologie clinique, santé publique, innovation et méthodologie, CHU de Nîmes, Université de Montpellier, Nîmes, France
| | - Nassim Hannas
- Laboratoire Labosud, groupe Inovie, Montpellier, France
| | - Serge Lumbroso
- Laboratoire de biochimie et biologie moléculaire, CHU Nîmes, France
| | - Etienne Cavalier
- Department of Clinical Chemistry, University of Liege, CHU de Liege, Belgium
| | - David-Paul De Brauwere
- Service de biochimie et biologie moléculaire, UM Pathologies Héréditaires du Métabolisme et Du Globule Rouge, Hospices civils de Lyon, France
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15
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Conrich-Wilks G, Ivison F, Kilpatrick ES. Factors influencing the derivation and clinical application of blood calcium adjustment equations. Ann Clin Biochem 2023; 60:54-62. [PMID: 36154292 PMCID: PMC9853561 DOI: 10.1177/00045632221131673] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
BACKGROUND Laboratories are recommended to use patient data to derive their local adjusted calcium (adjCa) equation, using numerous criteria to exclude patients with potential calcium metabolism abnormalities. It is not known which, if any, of the exclusions influence the final equation formula, or to what extent. This study investigated the effect using fewer exclusions has on adjCa equations and on patient results when compared to a reference equation. METHODS A reference ACB adjCa equation was derived from the total calcium and albumin pairs of 1305 individuals who, from an initial 22,906 adults, met recommended criteria (excluding abnormalities in either calcium, albumin, creatinine, magnesium, ALP or ALT, and specific clinical areas). This reference equation was compared to seven alternatives derived using fewer criteria, including one with no exclusions. All equations were applied to a validation cohort (n=19,640) to determine their effect on adjCa results and on categorizing patients into hypo-, normo- or hypercalcaemia. RESULTS Most alternative adjCa equations, including the one without any exclusions, showed no statistical (p < 0.05) difference in their slope or intercept compared to the ACB reference. Nor did any of the validation cohort have a clinically significantly different adjCa result (>5% and >0.1 mmol/L different) when applying an alternative rather than the reference equation. Additionally, no alternative equation changed the kappa categorization of the validation population's calcium status. CONCLUSIONS When deriving adjCa equations, most exclusion criteria have little influence on the equation or patient results, including using none at all. This knowledge could simplify deployment of local equations.
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Affiliation(s)
- Georgia Conrich-Wilks
- Department of Medical Sciences, University of Manchester, Manchester, UK,Georgia Conrich-Wilks, Department of Clinical Biochemistry, Glasgow Royal Infirmary, Glasgow, G4 9AD, UK.
| | - Fiona Ivison
- Department of Clinical Biochemistry, Manchester Royal Infirmary, Manchester University NHS Foundation Trust, Manchester, UK
| | - Eric S Kilpatrick
- Department of Clinical Biochemistry, Manchester Royal Infirmary, Manchester University NHS Foundation Trust, Manchester, UK
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16
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Chen R, Song A, Wang O, Jiang Y, Li M, Xia W, Lin X, Xing X. The preliminary study on cardiac structure and function in Chinese patients with primary hyperparathyroidism. Front Endocrinol (Lausanne) 2023; 14:1083521. [PMID: 36824357 PMCID: PMC9941322 DOI: 10.3389/fendo.2023.1083521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Accepted: 01/23/2023] [Indexed: 02/10/2023] Open
Abstract
PURPOSE Recent evidences show that primary hyperparathyroidism (PHPT) patients have a high prevalence of cardiovascular diseases. However, the reported changes in cardiac status are inconsistent in previous studies. The present work evaluated the cardiac structure and function in PHPT patients by echocardiography. METHODS PHPT patients and age- and sex-matched healthy controls were enrolled in this case-control study. Biochemical parameters were retrospectively collected from PHPT patients. Cardiac function and structure were assessed in all subjects using echocardiography. RESULTS A total of 153 PHPT patients and 51 age- and sex-matched healthy controls were enrolled in this study. The mean serum calcium and parathyroid hormone (PTH) levels in PHPT patients were 2.84 ± 0.28mmol/L and 206.9 (130.0, 447.5) pg/ml, respectively. Left ventricular ejection fraction (LVEF) and early to late mitral annular velocity (E/A) were significantly lower in PHPT patients than in healthy controls (68.2 ± 6.0 vs. 70.7 ± 16.7%, 1.0 ± 0.5 vs. 1.4 ± 0.5, respectively, p both < 0.05). The left ventricular mass index (LVMI) and the relative wall thickness (RWT) were not significantly different between the two groups. However, the difference in LVEF between PHPT patients without hypertension and diabetes and the control groups disappeared. The majority of PHPT patients had normal cardiac geometry; however, a proportion of them exhibited concentric remodeling (normal LVMI, RWT≥0.42). Serum calcium, corrected calcium, ionized calcium and PTH were inversely related to E/A, whereas serum phosphorus and 24-hour urine calcium were positively related to E/A. Furthermore, biochemical parameters were not correlated with LVEF. CONCLUSIONS These findings demonstrate that PHPT patients exhibit diastolic cardiac dysfunction reflected by decreased E/A, as well as possible cardiac structural abnormalities. The serum calcium, phosphorus, and parathyroid hormone levels may influence cardiac structure and function.
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Affiliation(s)
- Rong Chen
- Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
| | - An Song
- Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
| | - Ou Wang
- Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
| | - Yan Jiang
- Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
| | - Mei Li
- Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
| | - Weibo Xia
- Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
| | - Xue Lin
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
- *Correspondence: Xue Lin, ; Xiaoping Xing,
| | - Xiaoping Xing
- Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China
- *Correspondence: Xue Lin, ; Xiaoping Xing,
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Liu B, Dong D, Wang Z, Gao Y, Yu D, Ye S, Du X, Ma L, Cao H, Liu F, Zhang R, Li C. Analysis of influencing factors of serum total protein and serum calcium content in plasma donors. PeerJ 2022; 10:e14474. [PMID: 36523465 PMCID: PMC9745925 DOI: 10.7717/peerj.14474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 11/07/2022] [Indexed: 12/14/2022] Open
Abstract
Background and objectives The adverse effects of plasma donation on the body has lowered the odds of donation. The aim of this study was to investigate the prevalence of abnormal serum calcium and total serum protein related to plasma donation, identify the influencing factors, and come up with suggestions to make plasma donation safer. Methods Donors from 10 plasmapheresis centers in five provinces of China participated in this study. Serum samples were collected before donation. Serum calcium was measured by arsenazo III colorimetry, and the biuret method was used for total serum protein assay. An automatic biochemical analyzer was used to conduct serum calcium and total serum protein tests. Results The mean serum calcium was 2.3 ± 0.15 mmol/L and total serum protein was 67.75 ± 6.02 g/L. The proportions of plasma donors whose serum calcium and total serum protein were lower than normal were 20.55% (815/3,966) and 27.99% (1,111/3,969), respectively. There were significant differences in mean serum calcium and total serum protein of plasma donors with different plasma donation frequencies, gender, age, regions, and body mass index (BMI), (all p < 0.05). Logistic regression analysis revealed that donation frequencies, age, BMI and regions were significantly associated with a higher risk of low serum calcium level, and donation frequencies, gender, age and regions were significant determinants factors of odds of abnormal total serum protein. Conclusions Donation frequencies, gender, age, regions, and BMI showed different effects on serum calcium and total serum protein. More attention should be paid to the age, donation frequency and region of plasma donors to reduce the probability of low serum calcium and low total serum protein.
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Affiliation(s)
- Bin Liu
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
| | - Demei Dong
- Beijing Tiantan Biological Products Co., Ltd, Chengdu, China
| | - Zongkui Wang
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
| | - Yang Gao
- Beijing Tiantan Biological Products Co., Ltd, Chengdu, China
| | - Ding Yu
- Rongsheng Pharmaceuticals Co., Ltd, Chengdu, China
| | - Shengliang Ye
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
| | - Xi Du
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
| | - Li Ma
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
| | - Haijun Cao
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
| | - Fengjuan Liu
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
| | - Rong Zhang
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
| | - Changqing Li
- Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College, Chengdu, China
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Abstract
IMPORTANCE Hypercalcemia affects approximately 1% of the worldwide population. Mild hypercalcemia, defined as total calcium of less than 12 mg/dL (<3 mmol/L) or ionized calcium of 5.6 to 8.0 mg/dL (1.4-2 mmol/L), is usually asymptomatic but may be associated with constitutional symptoms such as fatigue and constipation in approximately 20% of people. Hypercalcemia that is severe, defined as total calcium of 14 mg/dL or greater (>3.5 mmol/L) or ionized calcium of 10 mg/dL or greater (≥2.5 mmol/L) or that develops rapidly over days to weeks, can cause nausea, vomiting, dehydration, confusion, somnolence, and coma. OBSERVATIONS Approximately 90% of people with hypercalcemia have primary hyperparathyroidism (PHPT) or malignancy. Additional causes of hypercalcemia include granulomatous disease such as sarcoidosis, endocrinopathies such as thyroid disease, immobilization, genetic disorders, and medications such as thiazide diuretics and supplements such as calcium, vitamin D, or vitamin A. Hypercalcemia has been associated with sodium-glucose cotransporter 2 protein inhibitors, immune checkpoint inhibitors, denosumab discontinuation, SARS-CoV-2, ketogenic diets, and extreme exercise, but these account for less than 1% of causes. Serum intact parathyroid hormone (PTH), the most important initial test to evaluate hypercalcemia, distinguishes PTH-dependent from PTH-independent causes. In a patient with hypercalcemia, an elevated or normal PTH concentration is consistent with PHPT, while a suppressed PTH level (<20 pg/mL depending on assay) indicates another cause. Mild hypercalcemia usually does not need acute intervention. If due to PHPT, parathyroidectomy may be considered depending on age, serum calcium level, and kidney or skeletal involvement. In patients older than 50 years with serum calcium levels less than 1 mg above the upper normal limit and no evidence of skeletal or kidney disease, observation may be appropriate. Initial therapy of symptomatic or severe hypercalcemia consists of hydration and intravenous bisphosphonates, such as zoledronic acid or pamidronate. In patients with kidney failure, denosumab and dialysis may be indicated. Glucocorticoids may be used as primary treatment when hypercalcemia is due to excessive intestinal calcium absorption (vitamin D intoxication, granulomatous disorders, some lymphomas). Treatment reduces serum calcium and improves symptoms, at least transiently. The underlying cause of hypercalcemia should be identified and treated. The prognosis for asymptomatic PHPT is excellent with either medical or surgical management. Hypercalcemia of malignancy is associated with poor survival. CONCLUSIONS AND RELEVANCE Mild hypercalcemia is typically asymptomatic, while severe hypercalcemia is associated with nausea, vomiting, dehydration, confusion, somnolence, and coma. Asymptomatic hypercalcemia due to primary hyperparathyroidism is managed with parathyroidectomy or observation with monitoring, while severe hypercalcemia is typically treated with hydration and intravenous bisphosphonates.
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Affiliation(s)
- Marcella Donovan Walker
- Division of Endocrinology, Department of Medicine, Columbia University Irving Medical Center, Vagelos College of Physicians and Surgeons, New York, New York
| | - Elizabeth Shane
- Division of Endocrinology, Department of Medicine, Columbia University Irving Medical Center, Vagelos College of Physicians and Surgeons, New York, New York
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19
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He X, Lin B, Tao T, Chen Q, Wang J, Jin J. Higher serum albumin-corrected calcium levels are associated with revascularization and poor outcome after mechanical thrombectomy. BMC Neurol 2022; 22:330. [PMID: 36056314 PMCID: PMC9438214 DOI: 10.1186/s12883-022-02856-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 08/24/2022] [Indexed: 11/13/2022] Open
Abstract
Background Serum calcium abnormalities have been determined to be associated with the risk and outcome of stroke. The aim of the present study was to examine the associations of serum calcium with vascular recanalization, symptomatic intracranial haemorrhage and functional outcome in stroke patients after mechanical thrombectomy. Methods A total of 192 patients treated with mechanical thrombectomy for anterior circulation large vessel occlusion were consecutively included from August 2017 to June 2021. Serum calcium levels were measured on admission, and albumin-corrected calcium levels were calculated for subsequent analysis. Successful arterial revascularization was defined as a modified Thrombolysis in Cerebral Infarction scale score ≥ 2b. Symptomatic intracranial haemorrhage was assessed according to the European Cooperative Acute Stroke Study (ECASS) III criteria. Poor functional outcome was defined as a modified Rankin Scale score > 2 at 3 months. Results Patients with poor outcomes had higher albumin-corrected calcium levels than patients with good outcomes before (2.20 (2.10, 2.30) mmol/L vs. 2.13 (2.04, 2.24) mmol/L, P = 0.002), and after adjusting for other factors (AOR 95% CI, 1.812 (1.253, 2.621), P = 0.002). Patients with unsuccessful recanalization had higher albumin-corrected calcium levels than those with recanalization (2.26 (2.09, 2.46) mmol/L vs. 2.17 (2.07, 2.27) mmol/L, P = 0.029), and after adjusting for other factors (AOR 95% CI, 2.068 (1.214, 3.524)), P = 0.008). No association was found between albumin-corrected calcium and symptomatic intracranial haemorrhage. Conclusions Higher serum albumin-corrected calcium levels are independently associated with revascularization and poor outcome in stroke patients after mechanical thrombectomy. Supplementary Information The online version contains supplementary material available at 10.1186/s12883-022-02856-2.
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Affiliation(s)
- Xinwei He
- Department of Neurology, Taizhou Central Hospital (Taizhou University Hospital), 999 Donghai Road, Taizhou, 318000, China
| | - Baomei Lin
- Department of Neurology, Taizhou Central Hospital (Taizhou University Hospital), 999 Donghai Road, Taizhou, 318000, China
| | - Taotao Tao
- Department of Neurology, Taizhou Central Hospital (Taizhou University Hospital), 999 Donghai Road, Taizhou, 318000, China
| | - Qiuyue Chen
- Department of Neurology, Taizhou Central Hospital (Taizhou University Hospital), 999 Donghai Road, Taizhou, 318000, China
| | - Jinhua Wang
- Department of Neurology, Huanggang Central Hospital, Huanggang, 438000, Hubei, China.
| | - Jiaolei Jin
- Department of Neurology, Taizhou Central Hospital (Taizhou University Hospital), 999 Donghai Road, Taizhou, 318000, China.
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20
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Grunbaum A, Kremer R. Parathyroid hormone-related protein (PTHrP) and malignancy. VITAMINS AND HORMONES 2022; 120:133-177. [PMID: 35953108 DOI: 10.1016/bs.vh.2022.03.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
PTHrP (parathyroid hormone related protein) is an important mediator of malignancy-related tumor progression and hypercalcemia that shares considerable homology and functionality with parathyroid hormone. In this chapter, we review what has been elucidated to date regarding PTHrP's role in malignancies. Starting with a review of calcium metabolism and regulation, we then summarize the discovery and structure of PTHrP and development of sensitive immunoassays for specific measurement. Subsequently, we explore its role in tumor progression, with emphasis on the primary tumor as well as skeletal and non-osseus metastases. We then consider the clinical implications of PTHrP in cancer before concluding with a discussion of both established and potential treatments for malignancy associated hypercalcemia and bone metastases.
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Affiliation(s)
- Ami Grunbaum
- Calcium Research Laboratories and Department of Medicine, McGill University and McGill University Health Centre, Montreal, QC, Canada
| | - Richard Kremer
- Calcium Research Laboratories and Department of Medicine, McGill University and McGill University Health Centre, Montreal, QC, Canada.
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21
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Guise TA, Wysolmerski JJ. Cancer-Associated Hypercalcemia. Reply. N Engl J Med 2022; 386:2540. [PMID: 35767456 DOI: 10.1056/nejmc2206287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Theresa A Guise
- University of Texas M.D. Anderson Cancer Center, Houston, TX
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22
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Novel methods of predicting ionized calcium status from routine data in critical care: External validation in MIMIC-III. Clin Chim Acta 2022; 531:375-381. [DOI: 10.1016/j.cca.2022.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/21/2022] [Accepted: 05/02/2022] [Indexed: 11/22/2022]
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23
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Anstey CM, Venkatesh B. A Comparison of the Commonly Used Surrogate Markers for Citrate Accumulation and Toxicity during Continuous Renal Replacement Therapy with Regional Citrate Anticoagulation. Blood Purif 2022; 51:997-1005. [PMID: 35443247 DOI: 10.1159/000524129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 03/16/2022] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Continuous renal replacement therapy using regional citrate anticoagulation is commonly used as a modality of organ support in the critically ill population. Currently, citrate accumulation or toxicity is assessed using surrogate markers, notably the uncorrected total-to-ionized calcium ration. The accuracy and utility of this method have been questioned. OBJECTIVES/AIMS The aim of this study was to compare the surrogate markers used for assessing citrate accumulation or toxicity using the measurement of plasma citrate as the gold standard. METHODS Blood was sampled from 20 patients before, during, and after episodes of filtration with citrate concentration measured using spectrophotometry. Demographic and other clinical and biochemical data were also collected. According to protocol, a 15 mmol/L solution of trisodium citrate was used as the prefilter anticoagulant. Results were analyzed using STATA (v16.0) and presented as mean (SD), median (IQR), or simple proportion. Univariate linear regression using citrate concentration as the dependent variable was performed with all surrogate markers. RESULTS Twenty patients (17 males) were enrolled in the study with a mean (SD) age of 62.7 (9.9) years. The uncorrected calcium ratio had the best fit to the citrate data with an R2 value of 0.39. The albumin-corrected calcium ratio, pH, anion gap (AG), albumin-corrected AG, standard base excess, and strong ion gap all had R2 values less than 0.05. CONCLUSION(S) In the absence of direct measurement of citrate concentration, uncorrected total-to-ionized calcium ratio is superior to other surrogate markers, though not ideal, in assessing citrate accumulation or toxicity.
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Affiliation(s)
- Chris M Anstey
- School of Medicine, Sunshine Coast Campus, Griffith University, Birtinya, Queensland, Australia
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24
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Ramirez-Sandoval JC, Diener-Cabieses P, Gutiérrez-Valle F, Ley-Tapia S, Pastrana-Brandes S, Galindo PE, Fagundo R, Moreno-Yañez M, Reza-Albarrán AA, Correa-Rotter R. Validation of an equation for free calcium estimation: accuracy improves after adjustment for phosphate and CO 2. Int Urol Nephrol 2022; 54:2625-2635. [PMID: 35294676 DOI: 10.1007/s11255-022-03170-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 02/27/2022] [Indexed: 10/18/2022]
Abstract
PURPOSE Free calcium is the gold standard for diagnosis of calcium disorders, although calcium assessment is routinely performed by albumin-adjusted calcium. Our objective was to develop a novel-specific correction equation for free calcium employing serum total calcium and other analytes. METHODS Retrospective single-center cohort study. A new equation for free calcium assessment was formulated from data of hospitalized patients (n = 3481, measurements = 7157) and tested in a validation cohort (n = 3218, measurements = 6911). All measurements were performed simultaneously from the same blood draw. RESULTS Total CO2 and phosphate, in addition to albumin, were the principal factors associated to calcium misdiagnosis. A novel laboratory-specific prediction equation was developed: free calcium (mmol/L) = 0.541 + (total calcium [mmol/L] *0.441) - (serum albumin [g/L] *0.0067) - (serum phosphate [mmol/L] *0.0425) - (CO2 [mmol/L] *0.003). This new equation substantially improved adjusted R2 to 0.67 (95% CI 0.78-0.82, p < 0.001; Kendall's c-tau: 0.28, p < 0.001). Bland-Altman plots of estimated free calcium and free calcium showed a mean difference of - 0.0006 mmol/L (LOA + 0.126 to - 0.124). In validation cohort, the AUC-ROC curves for hypercalcemia and hypocalcemia diagnosis deploying the new equation were 0.88 (95% CI 0.86-0.89, p < 0.001) and 0.98 (95% CI 0.97-99, p < 0.001), respectively, which were superior to historical formulas for calcium. In univariate models, eGFR was associated with Ca-status misdiagnosis, yet this association disappeared when analysis was adjusted to phosphate and CO2. CONCLUSIONS The novel equation proposed for prediction of free calcium could be useful when free calcium is not available. The conventional formulas misclassify many patients, in particular when phosphate or bicarbonate disturbances are present.
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Affiliation(s)
- Juan C Ramirez-Sandoval
- Department of Nephrology and Mineral Metabolism, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Belisario Dominguez Sección XVI, 14080, Mexico City, Mexico.
| | | | | | - Sofía Ley-Tapia
- Escuela de Medicina, Universidad Panamericana, Mexico City, Mexico
| | | | - Pablo E Galindo
- Department of Nephrology and Mineral Metabolism, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Belisario Dominguez Sección XVI, 14080, Mexico City, Mexico
| | - Reynerio Fagundo
- Central Laboratory, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Mauricio Moreno-Yañez
- Department of Nephrology and Mineral Metabolism, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Belisario Dominguez Sección XVI, 14080, Mexico City, Mexico
| | - Alfredo Adolfo Reza-Albarrán
- Department of Endocrinology, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Ricardo Correa-Rotter
- Department of Nephrology and Mineral Metabolism, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Belisario Dominguez Sección XVI, 14080, Mexico City, Mexico
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25
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Alhenc-Gelas M, Lefevre G, Bachmeyer C, M'Bappe P, Ouahabi S, Grateau G, Letavernier E, Steichen O. Poor performance of albumin or protein-adjusted plasma calcium to diagnose dyscalcemia in hospitalized patients: A confirmatory study in a general internal medicine department. Rev Med Interne 2021; 43:206-211. [PMID: 34953621 DOI: 10.1016/j.revmed.2021.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 11/13/2021] [Accepted: 11/28/2021] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Hypo- and hypercalcemia are common and some causes require urgent diagnosis and treatment. Measurement of ionized calcium is the reference test to diagnose calcium disorders but total calcium adjusted for protein or albumin concentration is more often used. METHODS Patients hospitalised in a general internal medicine department from September 2013 to December 2015 who had a total plasma calcium concentration and a serum albumin or protein concentration measured within 24h of a ionized calcium blood measurement were included. Total calcium was adjusted for protein or albumin concentration using widely used formulas and compared to ionized calcium as the gold standard. RESULTS Among 210 included patients, 46 (22%) had hypocalcemia, 124 (59%) normocalcemia and 40 (19%) hypercalcemia according to ionized calcium concentration. Total calcium had 50% sensitivity and 95% specificity to diagnose hypocalcemia and a 93% sensitivity and 89% specificity to diagnose hypercalcemia. Adjusting total calcium for protein or albumin concentrations did not increase and sometimes decreased diagnostic accuracy. CONCLUSION Total calcium, with or without albumin/protein adjustment, is poorly sensitive to screen for hypocalcemia. Unadjusted total calcium is as sensitive as protein- or albumin-adjusted total calcium to screen for hypercalcemia. These data argue against the use of albumin- or protein-adjusted calcium. Ionized calcium measurement should be performed to confirm dyscalcemia in patients with abnormal total calcium concentration and to rule out hypocalcemia in patients with total calcium concentration in the lower range of normal values.
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Affiliation(s)
- M Alhenc-Gelas
- Service de médecine interne, Assistance Publique-Hôpitaux de Paris (AP-HP), hôpital Tenon, 75020 Paris, France
| | - G Lefevre
- Laboratoire de biochimie, Assistance Publique-Hôpitaux de Paris (AP-HP), hôpital Tenon, 75020 Paris, France
| | - C Bachmeyer
- Service de médecine interne, Assistance Publique-Hôpitaux de Paris (AP-HP), hôpital Tenon, 75020 Paris, France
| | - P M'Bappe
- Service de médecine interne, Assistance Publique-Hôpitaux de Paris (AP-HP), hôpital Tenon, 75020 Paris, France
| | - S Ouahabi
- Laboratoire de biochimie, Assistance Publique-Hôpitaux de Paris (AP-HP), hôpital Tenon, 75020 Paris, France
| | - G Grateau
- Service de médecine interne, Assistance Publique-Hôpitaux de Paris (AP-HP), hôpital Tenon, 75020 Paris, France
| | - E Letavernier
- Explorations fonctionnelles rénales, Assistance Publique-Hôpitaux de Paris (AP-HP), hôpital Tenon, 75020 Paris, France
| | - O Steichen
- Service de médecine interne, Assistance Publique-Hôpitaux de Paris (AP-HP), hôpital Tenon, 75020 Paris, France; Sorbonne université, Inserm, Institut Pierre-Louise d'épidémiologie et de santé publique (IPLESP, UMR-S1136), 75006 Paris, France.
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26
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Kenny CM, Murphy CE, Boyce DS, Ashley DM, Jahanmir J. Things We Do for No Reason™: Calculating a "Corrected Calcium" Level. J Hosp Med 2021; 16:499-501. [PMID: 34197298 PMCID: PMC8340960 DOI: 10.12788/jhm.3619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 03/13/2021] [Indexed: 11/20/2022]
Affiliation(s)
- Colin M Kenny
- Division of Internal Medicine and Department of Medicine, Tripler Army Medical Center, Honolulu, Hawaii
- Corresponding Author: Colin M Kenny, DO;
| | - Caroline E Murphy
- Division of Internal Medicine and Department of Medicine, Tripler Army Medical Center, Honolulu, Hawaii
| | - Dacia S Boyce
- Division of Internal Medicine and Department of Medicine, Tripler Army Medical Center, Honolulu, Hawaii
| | - Deptmer M Ashley
- Division of Internal Medicine and Department of Medicine, Tripler Army Medical Center, Honolulu, Hawaii
| | - Jay Jahanmir
- Division of Nephrology, Department of Medicine, Tripler Army Medical Center, Honolulu, Hawaii
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27
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Law MM, Smith JD, Schneider HG, Wilson S. Misclassification of calcium status in end-stage kidney disease using albumin-adjusted calcium levels. Nephrology (Carlton) 2021; 26:725-732. [PMID: 34089212 DOI: 10.1111/nep.13910] [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] [Received: 02/23/2021] [Revised: 05/16/2021] [Accepted: 05/24/2021] [Indexed: 01/08/2023]
Abstract
BACKGROUND Albumin-adjusted calcium remains widely used in clinical practice with guidelines for chronic kidney disease (CKD) mineral bone disorder recommending the use of serum calcium for monitoring. This is despite ionized calcium being the biologically active fraction. This study aimed to investigate the ability of total calcium and albumin-adjusted calcium to correctly assign calcium status in stage 5/5D CKD across non-dialysis, haemodialysis and peritoneal dialysis patients. METHODS Over a 6-months, 352 paired serum and ionized calcium samples were collected from stage 5 (n = 58) and 5D (n = 294, 196 haemodialysis, 98 peritoneal dialysis) CKD patients in a tertiary-hospital setting. Albumin-adjusted calcium was calculated using the modified-Payne formula. Ionized calcium was the reference standard. The agreement between the two methods in assigning calcium status was assessed using Cohen's weighted kappa (κ) statistic. RESULTS Albumin-adjusted calcium was a poor predictor of calcium status compared to ionized calcium in stage 5/5D CKD (observed agreement 0.42, weighted κ 0.20, 95% CI 0.15-0.26). Dialysis dependence was associated with worse agreement (observed agreement 0.38, weighted κ 0.14, 95% CI 0.09-0.19). Total calcium was more reliable, however, remained inaccurate. Calcium status was not more accurately classified in those with higher albumin levels ≥30 g/L (observed agreement 0.47, weighted κ 0.23, 95% CI 0.10-0.36). CONCLUSION Total calcium provides better approximation of calcium status than albumin-adjusted calcium in stage 5/5D CKD. Albumin-adjusted calcium tends to 'overcorrect' serum calcium upward. Clinicians should use ionized calcium where accurate measure of calcium is indicated, with total calcium used as the next best option where resources are limited.
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Affiliation(s)
- Mandy M Law
- Department of Renal Medicine, Alfred Health, Melbourne, Victoria, Australia.,Department of Nephrology, The Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - Joel D Smith
- Department of Pathology, The Royal Melbourne Hospital, Parkville, Victoria, Australia.,Laboratory Services, The Royal Children's Hospital, Parkville, Victoria, Australia
| | - Hans G Schneider
- Clinical Biochemistry Unit, The Alfred Pathology Service, Alfred Health, Melbourne, Victoria, Australia.,Monash University, Melbourne, Victoria, Australia
| | - Scott Wilson
- Department of Renal Medicine, Alfred Health, Melbourne, Victoria, Australia.,Monash University, Melbourne, Victoria, Australia
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Yap E, Roche-Recinos A, Goldwasser P. Predicting Ionized Hypocalcemia in Critical Care: An Improved Method Based on the Anion Gap. J Appl Lab Med 2021; 5:4-14. [PMID: 32445343 DOI: 10.1373/jalm.2019.029314] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 04/30/2019] [Indexed: 12/24/2022]
Abstract
BACKGROUND Low ionized calcium (ICa) is prevalent in critical care patients. It is poorly detected by the popular indirect method, which corrects serum total calcium (TCa) for change in albumin. That correction (cTCa) ignores any concomitant change in the anion-complexed fraction of TCa. We tested whether the diagnosis of low ICa can be improved by further correcting for calcium complexation, represented by the anion gap (AG) or its components-sodium, chloride, and total carbon dioxide (tCO2). METHODS We retrospectively studied all patients in our intensive care units between 2009 and 2011 with ICa measured on arterial (n = 310) or venous (n = 462) gas panels within 19 min of a comprehensive chemistry panel. Logistic models to predict low ICa and linear models to estimate ICa were derived in the arterial group and validated in the venous group, using either AG (AG model) or its components (Ion model) as predictors, adjusted for TCa and albumin. RESULTS AG and its set of components were each highly significant independent predictors of low ICa. On validation, the logistic Ion model was better than the logistic AG model (ROC curve area ± SE: 0.92 ± 0.02 vs 0.89 ± 0.02; P = 0.008), which, in turn, was far better than cTCa (0.81 ± 0.03; P = 0.0006); the hypocalcemia rates predicted by the models showed good fit with the observed rates. Linear estimates of ICa were too imprecise for clinical use. CONCLUSIONS The adjustment of TCa for AG or for sodium, chloride, and tCO2 markedly improves the diagnosis of low ICa. This finding may be useful in guiding ICa testing.
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Affiliation(s)
- Ernie Yap
- State University of New York, Downstate Medical Center, Brooklyn, NY
| | | | - Philip Goldwasser
- Department of Medicine, Veterans Affairs New York Harbor Healthcare System, Brooklyn, NY
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29
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Interaction of serum calcium and folic acid treatment on first stroke in hypertensive males. Clin Nutr 2021; 40:2381-2388. [DOI: 10.1016/j.clnu.2020.10.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 10/16/2020] [Accepted: 10/19/2020] [Indexed: 12/13/2022]
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30
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Hartogsohn EAR, Khan AA, Kjaersulf LU, Sikjaer T, Hussain S, Rejnmark L. Changes in treatment needs of hypoparathyroidism during pregnancy and lactation: A case series. Clin Endocrinol (Oxf) 2020; 93:261-268. [PMID: 32350890 DOI: 10.1111/cen.14212] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 04/07/2020] [Accepted: 04/20/2020] [Indexed: 12/12/2022]
Abstract
OBJECTIVE As only sparse data are available, we aimed to investigate whether needs for activated vitamin D and calcium supplements change in women with hypoparathyroidism during pregnancy and lactation and risk of pregnancy-related complications. DESIGN Retrospective review of medical records. PATIENTS Twelve Danish and Canadian patients with chronic hypoparathyroidism who completed 17 pregnancies. MEASUREMENTS Data were extracted on plasma levels of ionized calcium (P-Ca2+ ) and doses of active vitamin D and calcium supplements during pregnancy (N = 14) and breastfeeding (N = 10). Data on pregnancy complications were available from all 17 pregnancies. RESULTS Although average doses of active vitamin D (P = .91) and calcium supplements (P = .43) did not change during pregnancies, a more than 20% increase or decrease in dose of active vitamin D was needed in more than half of the pregnancies in order to maintain normocalcemia. Five women (36%) developed hypercalcaemia by the end of pregnancy or start of lactation. Median levels of P-Ca2+ increased from 1.20 mmol/L in third trimester to 1.32 mmol/L in the post-partum period (P < .03). Accordingly, the average dose of active vitamin D was significantly reduced (P = .01) during lactation compared to 3rd trimester. One woman developed severe pre-eclampsia (6%). Further four pregnancies (24%) were complicated by polyhydramnios, dystocia and/or perinatal hypoxia. Ten pregnancies required caesarean delivery (59%) with four (24%) being performed as an emergency. CONCLUSION In chronic hypoparathyroidism, close medical monitoring of the mother with frequent adjustments in the dose of calcium and active vitamin D is required during pregnancy and lactation in order to maintain normocalcemia. Patients should be offered close obstetric care to handle potential perinatal complications. We recommend evaluating the neonate immediately after birth and notifying the paediatrician of the risks of hypocalcaemia as well as hypercalcaemia in the neonate.
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Affiliation(s)
- Etki A R Hartogsohn
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Aliya A Khan
- Medicine, Divisions of Endocrinology and Metabolism and Geriatric Medicine, McMaster University, Oakville, ON, Canada
| | | | - Tanja Sikjaer
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Sharjil Hussain
- Medicine, Divisions of Endocrinology and Metabolism and Geriatric Medicine, McMaster University, Oakville, ON, Canada
| | - Lars Rejnmark
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
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Toffaletti JG. Predicting Ionized Hypocalcemia with Total Calcium: Can "Correction" with Logistical Modeling of Multiple Analytes Do the Trick? J Appl Lab Med 2020; 5:1-3. [PMID: 32445336 DOI: 10.1373/jalm.2019.030197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 07/01/2019] [Indexed: 01/13/2023]
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Kur DK, Hillig T, Hansen SI, Goharian T, Witte ML, Thode J. Evaluation of a New Automated Routine Measurement for Serum Adjusted Ionized Calcium (at pH 7.4) in Patients Suspected of Calcium Metabolic Disease. J Appl Lab Med 2020; 5:704-715. [DOI: 10.1093/jalm/jfaa006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 11/01/2019] [Indexed: 11/14/2022]
Abstract
AbstractBackgroundTotal calcium is a less accurate test in predicting ionized calcium (Ca2+) in patients suspected of calcium metabolic disease. Nevertheless, total calcium continues to be used as routine measurement instead of adjusted Ca2+ (at pH 7.4). In the current study we evaluate a new multichannel instrument, the ISE Module E1200 for adjusted Ca2+ (at pH 7.4), containing three different ion-selective electrode (ISE) units.MethodsSerum from 1350 patients was compared to the ABL835 flex and KoneLab. Total calcium was also evaluated on the Dimension Vista 1500 system. Correlations between instruments were assessed by Deming regression and degree of agreement by Cohen’s kappa (κ).ResultsAnalytical imprecisions for the three ISE units for adjusted Ca2+ (at pH 7.4) was between 0.36% and 2.52%, and for pH between 0.32% and 3.24%. Results were comparable for each ISE unit (r = 0.797–0.917; all P < 0.0001) and in high-throughput settings (r = 0.871; P < 0.0001). The degree of agreement between instruments was moderate to good (κ = 0.52–0.77). In contrast, there was a very poor agreement (κ = −0.14) for total calcium with discrepancy in 53.4% of the samples.ConclusionsThe new ISE Module E1200 is comparable with the ABL835 flex and KoneLab 30i and therefore may be used for routine analysis of serum adjusted Ca2+ (at pH 7.4). The measured adjusted Ca2+ (at pH 7.4) was less comparable with very poor agreement to total calcium measured on the Dimension Vista 1500 system.
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Affiliation(s)
| | - Thore Hillig
- Department of Clinical Biochemistry, North Zealand Hospital Hilleroed, University of Copenhagen, Copenhagen, Denmark
| | - Steen I Hansen
- Department of Clinical Biochemistry, North Zealand Hospital Hilleroed, University of Copenhagen, Copenhagen, Denmark
| | - Tina Goharian
- Department of Clinical Biochemistry, North Zealand Hospital Hilleroed, University of Copenhagen, Copenhagen, Denmark
| | - Majbritt L Witte
- Department of Clinical Biochemistry, North Zealand Hospital Hilleroed, University of Copenhagen, Copenhagen, Denmark
| | - Jorgen Thode
- Department of Clinical Biochemistry, North Zealand Hospital Hilleroed, University of Copenhagen, Copenhagen, Denmark
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Pekar JD, Grzych G, Durand G, Haas J, Lionet A, Brousseau T, Glowacki F, Maboudou P. Calcium state estimation by total calcium: the evidence to end the never-ending story. Clin Chem Lab Med 2020; 58:222-231. [PMID: 31473684 DOI: 10.1515/cclm-2019-0568] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Accepted: 08/07/2019] [Indexed: 01/31/2023]
Abstract
Background Total blood calcium (TCa) is routinely used to diagnose and manage mineral and bone metabolism disorders. Numerous laboratories adjust TCa by albumin, though literature suggests there are some limits to this approach. Here we report a large retrospective study on agreement rate between ionized calcium (iCa) measurement and TCa or albumin-adjusted calcium measurements. Methods We retrospectively selected 5055 samples with simultaneous measurements of iCa, TCa, albumin and pH. We subgrouped our patients according to their estimated glomerular filtration rate (eGFR), albumin levels and pH. We analyzed each patient's calcium state with iCa as reference to determine agreement rate with TCa and albumin-adjusted calcium using Payne, Clase, Jain and Ridefelt formulas. Results The Payne formula performed poorly in patients with abnormal albumin, eGFR or pH levels. In patients with low albumin levels or blood pH disorders, Payne-adjusted calcium may overestimate the calcium state in up to 80% of cases. Similarly, TCa has better agreement with iCa in the case of hypoalbuminemia, but performed similarly to the Payne formula in patients with physiological albumin levels. The global agreement rate for Clase, Jain and Ridefelt formulas suggests significant improvement compared to Payne calcium adjustment but no significant improvement compared to TCa. Conclusions Total and albumin-adjusted calcium measurement leads to a misclassification of calcium status. Moreover, accurate calcium state determination depends on blood pH levels, whose measurement requires the same pre-analytical restrictions as iCa measurement. We propose that iCa should instead become the reference method to determine the real calcium state.
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Affiliation(s)
| | - Guillaume Grzych
- Centre de Biologie Pathologie, Laboratoire d'Hormonologie, Métabolisme-Nutrition, Oncologie, rue du Pr J. Leclercq, CHU Lille, F-59000 Lille, France.,Université de Lille, INSERM UMR-1011, Lille, France
| | - Gatien Durand
- CHU Lille, UF 8832 Biochimie automatisée, Lille, France
| | - Joël Haas
- Université de Lille, INSERM UMR-1011, Lille, France
| | - Arnaud Lionet
- CHU Lille, Service de Néphrologie et Transplantation, Lille, France
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Madeo B, De Vincentis S, Kara E, Vescini F, Trenti T, Guaraldi G, Rochira V. Reliability of calcium-phosphorus (Ca/P) ratio as a new, accurate and inexpensive tool in the diagnosis of some Ca-P disorders. J Endocrinol Invest 2019; 42:1041-1049. [PMID: 30796757 DOI: 10.1007/s40618-019-01025-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Accepted: 02/13/2019] [Indexed: 12/24/2022]
Abstract
PURPOSE The serum calcium/phosphorus (Ca/P) ratio is an accurate tool to differentiate patients with primary hyperparathyroidism (PHPT) from healthy subjects. However, other disorders of the Ca-P metabolism might impair the Ca/P ratio, such as hypophosphatemia (HypoP) not PHPT related. The aim of this study is to examine the diagnostic value of Ca/P ratio in the diagnosis of PHPT and HypoP not PHPT related. METHODS Single-center, retrospective, case-control study, including 150 patients with PHPT and 306 patients with HypoP, compared with 150 controls. HypoP patients were enrolled among HIV-infected patients by selecting those with Fanconi-like syndrome due to antiretroviral treatment. Parameters which were measured were serum Ca, P, parathyroid hormone (PTH), 25-OH vitamin D, albumin and creatinine). RESULTS The Ca/P ratio was significantly higher in PHPT and HypoP patients, compared to controls (p < 0.0001). At receiver operator characteristic (ROC) curve analysis, the cut-off of 3.56 (2.75 SI) for Ca/P ratio was able to identify patients with PHPT and HypoP (sensitivity 95%; specificity 93%). Among patients with Ca/P ratio above 3.56, the thresholds of 10.3 mg/dL (2.6 mmol/L) for serum Ca (sensitivity 93%; specificity 98%) and 80.5 pg/mL for PTH (sensitivity 91%; specificity 91%) were defined for the specific diagnosis of PHPT. CONCLUSIONS The Ca/P ratio above 3.56 (2.75 SI) is a highly accurate tool to identify PHPT and HypoP not PHPT-related patients. Thanks to its simplicity, this index can be proposed as a screening and first-line examination in the diagnostic work-up when a disorder of Ca-P metabolism is suspected or should be ruled out.
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Affiliation(s)
- B Madeo
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria of Modena, Ospedale Civile di Baggiovara, Modena, Italy.
| | - S De Vincentis
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria of Modena, Ospedale Civile di Baggiovara, Modena, Italy
- Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - E Kara
- Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
- Endocrinology and Metabolism Unit, University Hospital of Udine, Udine, Italy
| | - F Vescini
- Endocrinology and Metabolism Unit, University Hospital of Udine, Udine, Italy
| | - T Trenti
- Department of Laboratory Medicine and Pathological Anatomy, Azienda USL of Modena, Modena, Italy
| | - G Guaraldi
- Multidisciplinary Metabolic Clinic, Unit of Infectious Diseases, University of Modena and Reggio Emilia, Modena, Italy
| | - V Rochira
- Unit of Endocrinology, Department of Medical Specialties, Azienda Ospedaliero-Universitaria of Modena, Ospedale Civile di Baggiovara, Modena, Italy
- Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
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Grzych G, Pekar JD, Durand G, Deckmyn B, Maboudou P, Lippi G. Albumin-Adjusted Calcium and Ionized Calcium for Assessing Calcium Status in Hospitalized Patients. Clin Chem 2019; 65:703-705. [PMID: 30910778 DOI: 10.1373/clinchem.2018.300392] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Guillaume Grzych
- Department of Biochemistry and Molecular Biology, Laboratory of Endocrinology Metabolism-Nutrition, Oncology Biology Pathology Center University of Lille Lille, France .,INSERM UMR-1011-European Genomic Institute for Diabetes, Pasteur Institute University of Lille Lille, France
| | - Jean David Pekar
- CHU Lille Biochemistry Emergency Department, Biology and Pathology Center University of Lille Lille, France
| | - Gatien Durand
- CHU Lille Biochemistry Emergency Department, Biology and Pathology Center University of Lille Lille, France
| | - Benjamin Deckmyn
- INSERM UMR-1011-European Genomic Institute for Diabetes, Pasteur Institute University of Lille Lille, France.,GHICL Department of Biochemistry Saint Philibert Hospital Lomme, France
| | - Patrice Maboudou
- CHU Lille Biochemistry Emergency Department, Biology and Pathology Center University of Lille Lille, France
| | - Giuseppe Lippi
- Section of Clinical Biochemistry University of Verona, Verona, Italy
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Smith JD, Wilson S, Schneider HG. In Reply. Clin Chem 2019; 65:706-707. [PMID: 30910776 DOI: 10.1373/clinchem.2019.302216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Joel D Smith
- Clinical Biochemistry Unit Alfred Pathology Service Alfred Health Melbourne, Victoria, Australia
| | - Scott Wilson
- Department of Renal Medicine Alfred Health Melbourne, Victoria, Australia.,Monash University Melbourne, Victoria, Australia
| | - Hans G Schneider
- Clinical Biochemistry Unit Alfred Pathology Service Alfred Health Melbourne, Victoria, Australia .,Monash University Melbourne, Victoria, Australia
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Affiliation(s)
- R Brian Payne
- Department of Chemical Pathology St James's University Hospital Leeds, UK (Retired)
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