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Alindogan A, Joseph R. Disorders of Sodium. Emerg Med Clin North Am 2023; 41:697-709. [PMID: 37758418 DOI: 10.1016/j.emc.2023.06.003] [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: 10/03/2023]
Abstract
Sodium imbalances are a common occurrence in the emergency department. Although recognition and diagnosis are relatively straightforward, discovering the cause and management should be approached systematically. The most important history items to ascertain is if the patient has symptoms and how long this imbalance has taken to develop. Treatment rapidity depends on severity of symptoms with the most rapid treatment occurring in only the severely symptomatic. Overcorrection has dire consequences and must be approached in a careful and systematic fashion in order to prevent these devastating consequences.
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Affiliation(s)
- Aaron Alindogan
- Department of Emergency Medicine, UTHSCSA, Floyd Curl Drive, MC 7736, San Antonio, TX 78229, USA
| | - Ryan Joseph
- Department of Emergency Medicine, UTHSCSA, Floyd Curl Drive, MC 7736, San Antonio, TX 78229, USA.
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2
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Aziz F, Sam R, Lew SQ, Massie L, Misra M, Roumelioti ME, Argyropoulos CP, Ing TS, Tzamaloukas AH. Pseudohyponatremia: Mechanism, Diagnosis, Clinical Associations and Management. J Clin Med 2023; 12:4076. [PMID: 37373769 DOI: 10.3390/jcm12124076] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 06/08/2023] [Accepted: 06/13/2023] [Indexed: 06/29/2023] Open
Abstract
Pseudohyponatremia remains a problem for clinical laboratories. In this study, we analyzed the mechanisms, diagnosis, clinical consequences, and conditions associated with pseudohyponatremia, and future developments for its elimination. The two methods involved assess the serum sodium concentration ([Na]S) using sodium ion-specific electrodes: (a) a direct ion-specific electrode (ISE), and (b) an indirect ISE. A direct ISE does not require dilution of a sample prior to its measurement, whereas an indirect ISE needs pre-measurement sample dilution. [Na]S measurements using an indirect ISE are influenced by abnormal concentrations of serum proteins or lipids. Pseudohyponatremia occurs when the [Na]S is measured with an indirect ISE and the serum solid content concentrations are elevated, resulting in reciprocal depressions in serum water and [Na]S values. Pseudonormonatremia or pseudohypernatremia are encountered in hypoproteinemic patients who have a decreased plasma solids content. Three mechanisms are responsible for pseudohyponatremia: (a) a reduction in the [Na]S due to lower serum water and sodium concentrations, the electrolyte exclusion effect; (b) an increase in the measured sample's water concentration post-dilution to a greater extent when compared to normal serum, lowering the [Na] in this sample; (c) when serum hyperviscosity reduces serum delivery to the device that apportions serum and diluent. Patients with pseudohyponatremia and a normal [Na]S do not develop water movement across cell membranes and clinical manifestations of hypotonic hyponatremia. Pseudohyponatremia does not require treatment to address the [Na]S, making any inadvertent correction treatment potentially detrimental.
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Affiliation(s)
- Fahad Aziz
- Department of Medicine, Division of Nephrology, University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA
| | - Ramin Sam
- Department of Medicine, Zuckerberg San Francisco General Hospital, School of Medicine, University of California in San Francisco, San Francisco, CA 94110, USA
| | - Susie Q Lew
- Department of Medicine, School of Medicine and Health Sciences, George Washington University, Washington, DC 20052, USA
| | - Larry Massie
- Department of Pathology, Raymond G. Murphy Veterans Affairs Medical Center, University of New Mexico School of Medicine, Albuquerque, NM 87108, USA
| | - Madhukar Misra
- Department of Medicine, Division of Nephrology, University of Missouri, Columbia, MO 65211, USA
| | - Maria-Eleni Roumelioti
- Department of Medicine, Division of Nephrology, University of New Mexico School of Medicine, Albuquerque, NM 87106, USA
| | - Christos P Argyropoulos
- Department of Medicine, Division of Nephrology, University of New Mexico School of Medicine, Albuquerque, NM 87106, USA
| | - Todd S Ing
- Department of Medicine, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153, USA
| | - Antonios H Tzamaloukas
- Research Service, Department of Medicine, Raymond G. Murphy Veterans Affairs Medical Center, University of New Mexico School of Medicine, Albuquerque, NM 87108, USA
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Lefèvre CR, Gibert C, Maucorps L, Vasse J, Michel M, Chupin M, Zhao F, Desmurs L, Collet N, Di Filippo M, Cartier R, Monneret D, Marmontel O. Pseudohyponatremia: interference of hyperglycemia on indirect potentiometry. Clin Chem Lab Med 2023; 61:e25-e28. [PMID: 36282968 DOI: 10.1515/cclm-2022-0766] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/14/2022] [Indexed: 12/15/2022]
Affiliation(s)
- Charles R Lefèvre
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
- Laboratoire de Biochimie-Toxicologie, Hôpital Pontchaillou, CHU de Rennes, Rennes, France
| | - Charles Gibert
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Laure Maucorps
- Laboratoire de Biochimie-Toxicologie, Hôpital Pontchaillou, CHU de Rennes, Rennes, France
| | - Joséphine Vasse
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Marie Michel
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Marine Chupin
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Fanny Zhao
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Laurent Desmurs
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Nicolas Collet
- Laboratoire de Biochimie-Toxicologie, Hôpital Pontchaillou, CHU de Rennes, Rennes, France
| | - Mathilde Di Filippo
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Régine Cartier
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Denis Monneret
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
| | - Oriane Marmontel
- Service de Biochimie et Biologie Moléculaire, Laboratoire de Biologie Médicale Multi-Sites (LBMMS), Hospices Civils de Lyon (HCL), Lyon, France
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4
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Rao J, Ma Y, Long J, Tu Y, Guo Z. The combined impact of hyponatremia and hematocrit on the risk for 90-day readmission and death in patients with heart failure: dilutional hyponatremia versus depletional hyponatremia. Ann Saudi Med 2023; 43:17-24. [PMID: 36739500 PMCID: PMC9899337 DOI: 10.5144/0256-4947.2023.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Hyponatremia is common in hospitalized patients with heart failure (HF) and predicts a poor prognosis after discharge. In general, hyponatremia can be divided into two types: dilutional or depletional. OBJECTIVE Assess the impact of hyponatremia type on short-term outcomes. DESIGN Retrospective cohort SETTINGS: Single center in China PATIENTS AND METHODS: We sorted patients by hyponatremia into two types: dilutional hyponatremia (DiH, with hematocrit <35%) and depletional hyponatremia (DeH, with hematocrit ≥35%). The Kaplan-Meier method and Cox regression analysis were used to identify the impact of hyponatremia types on the risk for 90-day readmission and death. MAIN OUTCOME MEASURES 90-day readmission and death combined. SAMPLE SIZE 1770 patients. RESULTS Hyponatremia was present in 324/1770 patients with 182 cases classified as DiH versus 142 as DeH. Kaplan-Meier analyses showed a higher incidence of poor short-term outcomes in hyponatremia compared with normonatremia (log-rank P<.001), and the risk was higher in DiH than DeH although the difference was not statistically significant (log-rank P=.656). Multivariate Cox regression analyses showed that only DiH was independently associated with short-term outcomes (HR=1.34, 95%CI: 1.02-1.77, P=.038), but not DeH (HR=1.32, 95%CI: 0.97-1.80, P=.081). Analysis of the secondary endpoints showed that DiH increased the risk of readmission but not death (HR=1.36, P=.035 for readmission; HR=1.13, P=.831 for all-cause death). CONCLUSIONS Low hematocrit, rather than high hematocrit, with hyponatremia was associated with a risk of 90-day readmission in patients with HF. LIMITATIONS Single center, nonrandomized. CONFLICT OF INTEREST None.
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Affiliation(s)
- Jiahuan Rao
- From the Department of Cardiology, Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yusheng Ma
- From the Department of Cardiology, Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Jieni Long
- From the Department of Cardiology, Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yan Tu
- From the Department of Cardiology, Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Zhigang Guo
- From the Department of Cardiology, Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou, China
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5
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McCarron EP, Murray E, McKeeman GC, Coward SM, Hamilton P, Connolly G, Roberts BV. Investigating the effects of endogenous lipaemia on the measurement of sodium by indirect ion specific electrode potentiometry. Ann Clin Biochem 2022; 59:324-329. [PMID: 35440186 DOI: 10.1177/00045632221098628] [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: 11/16/2022]
Abstract
BACKGROUND The widely automated method using indirect ion specific electrodes (ISE) potentiometry for determination of sodium concentration is prone to interference from lipaemia. Manufacturer-specified lipaemic (L)-index cut offs may underestimate the effects of endogenous lipaemia. METHODS We assessed the interference on sodium concentration caused by endogenous lipaemia in 32 residual samples (from 13 patients) using indirect ISE (Cobas® 8000 modular analyser with c702 module, Roche diagnostics) and direct ISE (GEM 4000 premier, Werfen) potentiometric methods. Regression analysis (linear and non-linear) was used to determine a reliable (L)-index cut off for reporting sodium concentration. RESULTS There was a poor correlation observed between triglyceride concentration and (L)-index. There was significant negative interference caused by endogenous lipaemia within analysed samples. Non-linear regression demonstrated a negative interference of approximately 5% at an (L)-index of 250. CONCLUSION At present, the manufacturer advises not to report sodium concentration by indirect ISE on the Cobas® 8000 modular analyser if the (L)-index is >2000. However, this has been determined by the addition of exogenous lipids (Intralipid®) and it is clear that this is not comparable to endogenous lipaemia. To ensure patient safety, clinical laboratories should consider lowering the cut off for (L)-index that they use for reporting sodium concentration.
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Affiliation(s)
- Eamon P McCarron
- Department of Clinical Biochemistry, Kelvin Laboratory, Royal Victoria Hospital, 1602Belfast Health and Social Care Trust (BHSCT), Belfast, UK.,Centre for Experimental Medicine, Queen's University, Belfast, UK
| | - Emma Murray
- Department of Clinical Biochemistry, Kelvin Laboratory, Royal Victoria Hospital, 1602Belfast Health and Social Care Trust (BHSCT), Belfast, UK
| | - Gareth C McKeeman
- Department of Clinical Biochemistry, Kelvin Laboratory, Royal Victoria Hospital, 1602Belfast Health and Social Care Trust (BHSCT), Belfast, UK
| | - Stephen M Coward
- Department of Clinical Biochemistry, Kelvin Laboratory, Royal Victoria Hospital, 1602Belfast Health and Social Care Trust (BHSCT), Belfast, UK
| | - Paul Hamilton
- Department of Clinical Biochemistry, Kelvin Laboratory, Royal Victoria Hospital, 1602Belfast Health and Social Care Trust (BHSCT), Belfast, UK.,Centre for Medical Education, Queen's University, Belfast, UK
| | - Grainne Connolly
- Department of Clinical Biochemistry, Kelvin Laboratory, Royal Victoria Hospital, 1602Belfast Health and Social Care Trust (BHSCT), Belfast, UK
| | - Brona V Roberts
- Department of Clinical Biochemistry, Kelvin Laboratory, Royal Victoria Hospital, 1602Belfast Health and Social Care Trust (BHSCT), Belfast, UK
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Corsello A, Malandrini S, Bianchetti MG, Agostoni C, Cantoni B, Meani F, Faré PB, Milani GP. Sodium assessment in neonates, infants, and children: a systematic review. Eur J Pediatr 2022; 181:3413-3419. [PMID: 35821131 PMCID: PMC9395449 DOI: 10.1007/s00431-022-04543-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 06/15/2022] [Accepted: 06/23/2022] [Indexed: 11/29/2022]
Abstract
Hyponatremia is a common disorder in childhood. The indirect and the direct potentiometry are currently the most popular techniques employed for sodium assessment, although discrepancies between the two techniques may be > 10 mmol/L. It is known that < 20% of the recently published articles report information about the technique used for sodium analysis, but no data are available on pediatric studies. This study aimed at investigating the laboratory technique employed for sodium measurement in studies conducted in childhood. A systematic literature search in PubMed, Embase, and Web of Science was undertaken to identify articles containing the word "hyponatremia" in the title between 2013 and 2020. Papers with < 10 subjects were excluded. A total of 565 articles were included. Information on the laboratory technique used for sodium analysis was more commonly (p = 0.035) reported in pediatric (n = 15, 28%) than in non-pediatric (n = 81, 16%) reports. The frequency of reports with and without information on the technique for sodium assessment was not different with respect to the study characteristics, the quartile of the journal where the paper was published, the country income setting, and the inclusion of neonates among the 54 pediatric studies. Conclusion: Most pediatric papers do not report any information on the technique used for sodium analysis. Although international authorities have recommended the implementation of direct potentiometry, a low awareness on this issue is still widespread in pediatric research. What is Known: • Direct potentiometry and indirect potentiometry are currently employed for sodium analysis in blood. • Direct potentiometry is more accurate. What is New: • Less than 30% of pediatric articles provide information on the technique employed for sodium analysis in blood. • Indirect potentiometry is more frequently employed than direct potentiometry in pediatric studies.
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Affiliation(s)
- Antonio Corsello
- Department of Clinical Sciences and Community Health, Università Degli Studi Di Milano, Milan, Italy
| | - Sabrina Malandrini
- Faculty of Biomedical Sciences, Università Della Svizzera Italiana, Lugano, Switzerland
| | - Mario G. Bianchetti
- Faculty of Biomedical Sciences, Università Della Svizzera Italiana, Lugano, Switzerland
| | - Carlo Agostoni
- Department of Clinical Sciences and Community Health, Università Degli Studi Di Milano, Milan, Italy ,Pediatric Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Barbara Cantoni
- Pediatric Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Francesco Meani
- Department of Gynecology and Obstetrics, Centro Di Senologia Della Svizzera Italiana, Ente Ospedaliero Cantonale, Lugano, Switzerland
| | - Pietro B. Faré
- Department of Internal Medicine, Ente Ospedaliero Cantonale, 6600 Locarno, Switzerland
| | - Gregorio P. Milani
- Department of Clinical Sciences and Community Health, Università Degli Studi Di Milano, Milan, Italy ,Pediatric Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
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Datta SK, Chopra P. Interference in Ion-Selective Electrodes Due to Proteins and Lipids. J Appl Lab Med 2021; 7:589-595. [PMID: 34751739 DOI: 10.1093/jalm/jfab125] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/13/2021] [Indexed: 12/22/2022]
Abstract
BACKGROUND Ion-selective electrodes (ISE) have become the mainstay of electrolyte measurements in the clinical laboratory. In most automated analyzers used in large diagnostic laboratories, indirect ISE (iISE) -based electrolyte estimation is done; whereas direct ISE (dISE) -based equipment are mostly used in blood gas analyzers and in the point-of-care (PoC) setting. CONTENT Both the techniques, iISE as well as dISE, are scientifically robust; however, the results are often not interchangeable. Discrepancy happens between the two commonly due to interferences that affect the two measuring principles differently. Over the last decade, several studies have reported discrepancies between dISE and iISE arising due to abnormal protein and lipid contents in the sample. SUMMARY The present review endeavors to consolidate the knowledge accumulated in relation to interferences due to abnormal protein and lipid contents in sample with the principal focus resting on probable solutions thereof.
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Affiliation(s)
- Sudip Kumar Datta
- Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Parul Chopra
- Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi, India
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8
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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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Malandrini S, Lava SAG, Bianchetti MG, Meani F, Faré PB, Camozzi P, Cugliari M, Agostoni C, Milani GP. Which laboratory technique is used for the blood sodium analysis in clinical research? A systematic review. Clin Chem Lab Med 2021; 59:1501-1506. [PMID: 33915610 DOI: 10.1515/cclm-2021-0293] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 04/19/2021] [Indexed: 11/15/2022]
Abstract
BACKGROUND Circulating sodium is analyzed by flame spectrometry and indirect or direct potentiometry. The differences between estimates returned by the three techniques are often relevant. It is unknown whether peer-reviewed international publications focusing on this parameter provide information about the technique. Objectives of the study were to ascertain if information about the employed technique is provided. CONTENT A search in the National Library of Medicine for articles whose title contains "hyponatr[a]emia" was performed. We restricted the search to clinical reports including 10 or more humans published in the 2013-2015 and 2017-2019 periods. Authors of papers not reporting the technique were contacted to obtain this information. The study design and journal quartile ranking of each article were also evaluated. SUMMARY For the final analysis, we included 361 articles (2013-2015, n=169; 2017-2019, n=192). Information about the laboratory technique was given in 61(17%) articles. Thanks to our inquiry, we collected this information for 116(32%) further reports. Indirect potentiometry was the most frequently used technique, followed by direct potentiometry. Spectrometry was used in a small minority of studies. Study design, journal ranking and study period did not modulate the mentioned frequency. OUTLOOK Most articles focusing on hyponatremia do not provide information on the laboratory technique. This parameter is nowadays analyzed by indirect or, less frequently, direct potentiometry. The figures are similar for high and low impact factor journals and for the 2013-2015 and the 2017-2019 periods. Many authors, reviewers and editors likely assume that the results of this parameter are not influenced by the technique.
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Affiliation(s)
- Sabrina Malandrini
- Family Medicine Institute, Faculty of Biomedical Science, Università della Svizzera italiana, Lugano, Switzerland.,Department of Internal Medicine, Ente Ospedaliero Cantonale, Lugano, Switzerland
| | - Sebastiano A G Lava
- Department of Pediatrics, Pediatric Cardiology Unit, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland
| | - Mario G Bianchetti
- Family Medicine Institute, Faculty of Biomedical Science, Università della Svizzera italiana, Lugano, Switzerland.,Pediatric Institute of Southern Switzerland, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Francesco Meani
- Department of Gynecology and Obstetrics, Centro di Senologia della Svizzera Italiana, Ente Ospedaliero Cantonale, Lugano, Switzerland
| | - Pietro B Faré
- Infectious Diseases Unit, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Pietro Camozzi
- Department of Internal Medicine, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Marco Cugliari
- Pediatric Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
| | - Carlo Agostoni
- Pediatric Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
| | - Gregorio P Milani
- Pediatric Institute of Southern Switzerland, Ente Ospedaliero Cantonale, Bellinzona, Switzerland.,Pediatric Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
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10
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Reply to Morton. Am J Gastroenterol 2021; 116:835-836. [PMID: 33982960 DOI: 10.14309/ajg.0000000000001047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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11
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Hyponatremia in Patients with Hematologic Diseases. J Clin Med 2020; 9:jcm9113721. [PMID: 33228240 PMCID: PMC7699475 DOI: 10.3390/jcm9113721] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 11/10/2020] [Accepted: 11/17/2020] [Indexed: 12/14/2022] Open
Abstract
Hyponatremia is the most common electrolyte disorder in clinical practice and is associated with increased morbidity and mortality. It is frequently encountered in hematologic patients with either benign or malignant diseases. Several underlying mechanisms, such as hypovolemia, infections, toxins, renal, endocrine, cardiac, and liver disorders, as well as the use of certain drugs appear to be involved in the development or the persistence of hyponatremia. This review describes the pathophysiology of hyponatremia and discusses thoroughly the contributing factors and mechanisms that may be encountered specifically in patients with hematologic disorders. The involvement of the syndrome of inappropriate antidiuretic hormone (SIADH) secretion and renal salt wasting syndrome (RSWS) in the development of hyponatremia in such patients, as well as their differential diagnosis and management, are also presented. Furthermore, the distinction between true hyponatremia and pseudohyponatremia is explained. Finally, a practical algorithm for the evaluation of hyponatremia in hematologic patients, as well as the principles of hyponatremia management, are included in this review.
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12
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Ebonwu EO, Nagel SE, Repsold L, Pillay TS. Critical evaluation of equations for serum osmolality: Proposals for effective clinical utility. Clin Chim Acta 2020; 510:79-87. [PMID: 32622969 DOI: 10.1016/j.cca.2020.06.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 06/26/2020] [Accepted: 06/26/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND Many studies have assessed the predictive accuracy of serum osmolality equations. Different approaches for selecting a usable equation were compared using thirty published equations and patient data from a regional hospital laboratory. METHODS Laboratory records were extracted with same-sample results for measured serum osmolality, sodium, potassium, urea and glucose analysed in a regional hospital laboratory between 1/1/2017-31/12/2018. Differences were analysed using Passing-Bablok and difference (Bland-Altman) analysis. Three approaches were compared: the shotgun approach, adjusting for bias, and deriving a novel equation using multivariate analysis. The criteria for success included bias ≤0.7%, a 230 - 400 mOsm/kg range, and osmolal gap (OG) 95% reference limits within ±10 mOsm/kg. RESULTS The majority of equations produced proportionally negative-biased results. The shotgun approach identified two equations (EQ19, EQ6) with bias ≤0.7% but unworkable OG reference limits. The bias adjustment approach produced several equations with bias ≤ 0.7% and OG reference limits within or equivalent to ±10 mOsm/kg. A novel equation generated by us (1.89Na+ + 1.71 K+ + 1.08 Urea + 1.08 Glucose + 13.7) improved with the adjustment of bias and was not superior to the adjusted published equations. CONCLUSION Few published equations are immediately usable. Adjustment of bias derives several usable equations of which the best had OG ranges <20 mOsm/kg. We conclude that adjustment of bias can generate equations of equal or superior performance to that of novel equations.
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Affiliation(s)
- Emmanuel O Ebonwu
- Tshwane University of Technology (TUT), Staatsartillerie Rd, Pretoria-West, Pretoria 0183, South Africa; Department of Chemical Pathology, Faculty of Health Sciences, University of Pretoria and National Health Laboratory Service (NHLS) Tshwane Academic Division, Pretoria, South Africa
| | - Susanna E Nagel
- Department of Chemical Pathology, Faculty of Health Sciences, University of Pretoria and National Health Laboratory Service (NHLS) Tshwane Academic Division, Pretoria, South Africa
| | - Lisa Repsold
- Tshwane University of Technology (TUT), Staatsartillerie Rd, Pretoria-West, Pretoria 0183, South Africa
| | - Tahir S Pillay
- Department of Chemical Pathology, Faculty of Health Sciences, University of Pretoria and National Health Laboratory Service (NHLS) Tshwane Academic Division, Pretoria, South Africa; Division of Chemical Pathology, Faculty of Health Sciences, University of Cape Town, South Africa.
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13
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Sodium monitoring in infants < 100 days of life. Eur J Pediatr 2020; 179:1167-1168. [PMID: 31732801 DOI: 10.1007/s00431-019-03471-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 09/05/2019] [Accepted: 09/10/2019] [Indexed: 10/25/2022]
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14
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Van Regenmortel N, Hendrickx S, Roelant E, Baar I, Dams K, Van Vlimmeren K, Embrecht B, Wittock A, Hendriks JM, Lauwers P, Van Schil PE, Van Craenenbroeck AH, Verbrugghe W, Malbrain MLNG, Van den Wyngaert T, Jorens PG. 154 compared to 54 mmol per liter of sodium in intravenous maintenance fluid therapy for adult patients undergoing major thoracic surgery (TOPMAST): a single-center randomized controlled double-blind trial. Intensive Care Med 2019; 45:1422-1432. [PMID: 31576437 PMCID: PMC6773673 DOI: 10.1007/s00134-019-05772-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 08/29/2019] [Indexed: 01/08/2023]
Abstract
PURPOSE To determine the effects of the sodium content of maintenance fluid therapy on cumulative fluid balance and electrolyte disorders. METHODS We performed a randomized controlled trial of adults undergoing major thoracic surgery, randomly assigned (1:1) to receive maintenance fluids containing 154 mmol/L (Na154) or 54 mmol/L (Na54) of sodium from the start of surgery until their discharge from the ICU, the occurrence of a serious adverse event or the third postoperative day at the latest. Investigators, caregivers and patients were blinded to the treatment. Primary outcome was cumulative fluid balance. Electrolyte disturbances were assessed as secondary endpoints, different adverse events and physiological markers as safety and exploratory endpoints. FINDINGS We randomly assigned 70 patients; primary outcome data were available for 33 and 34 patients in the Na54 and Na154 treatment arms, respectively. Estimated cumulative fluid balance at 72 h was 1369 mL (95% CI 601-2137) more positive in the Na154 arm (p < 0.001), despite comparable non-study fluid sources. Hyponatremia < 135 mmol/L was encountered in four patients (11.8%) under Na54 compared to none under Na154 (p = 0.04), but there was no significantly more hyponatremia < 130 mmol/L (1 versus 0; p = 0.31). There was more hyperchloremia > 109 mmol/L under Na154 (24/35 patients, 68.6%) than under Na54 (4/34 patients, 11.8%) (p < 0.001). The treating clinicians discontinued the study due to clinical or radiographic fluid overload in six patients receiving Na154 compared to one patient under Na54 (excess risk 14.2%; 95% CI - 0.2-30.4%, p = 0.05). CONCLUSIONS In adult surgical patients, sodium-rich maintenance solutions were associated with a more positive cumulative fluid balance and hyperchloremia; hypotonic fluids were associated with mild and asymptomatic hyponatremia.
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Affiliation(s)
- Niels Van Regenmortel
- Department of Intensive Care Medicine, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium.
- Department of Intensive Care Medicine, Ziekenhuis Netwerk Antwerpen Campus Stuivenberg, Lange Beeldekensstraat 267, 2060, Antwerp, Belgium.
| | - Steven Hendrickx
- Department of Anesthesiology, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Ella Roelant
- Clinical Trial Center (CTC), Clinical Research Center Antwerp, Antwerp University Hospital, University of Antwerp, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
- StatUa, Center for Statistics, University of Antwerp, Prinsstraat 13, 2000, Antwerp, Belgium
| | - Ingrid Baar
- Department of Intensive Care Medicine, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Karolien Dams
- Department of Intensive Care Medicine, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Karen Van Vlimmeren
- Department of Anesthesiology, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Bart Embrecht
- Department of Anesthesiology, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Anouk Wittock
- Department of Anesthesiology, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Jeroen M Hendriks
- Department of Thoracic and Vascular Surgery, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
- Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
| | - Patrick Lauwers
- Department of Thoracic and Vascular Surgery, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
- Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
| | - Paul E Van Schil
- Department of Thoracic and Vascular Surgery, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
- Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
| | - Amaryllis H Van Craenenbroeck
- Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
- Department of Nephrology, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Walter Verbrugghe
- Department of Intensive Care Medicine, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Manu L N G Malbrain
- Department of Intensive Care Medicine, University Hospital Brussels (UZB), Laarbeeklaan 101, Jette, 1090, Brussels, Belgium
- Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, Jette, 1090, Brussels, Belgium
| | - Tim Van den Wyngaert
- Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
- Department of Nuclear Medicine, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
| | - Philippe G Jorens
- Department of Intensive Care Medicine, Antwerp University Hospital, Wilrijkstraat 10, Edegem, 2650, Antwerp, Belgium
- Faculty of Medicine and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
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15
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Tel-Karthaus N, Salet GAM, Jacobs LH, Nabbe KC, Schoenmakers CH, van der Doelen RH, Geerts N, Hoedemakers RM. Instrument dependent erroneous sodium measurements in hypoproteinemic critically ill patients are causing significant misclassification of dysnatremias. ACTA ACUST UNITED AC 2019; 57:e222-e225. [DOI: 10.1515/cclm-2018-0963] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 01/18/2019] [Indexed: 11/15/2022]
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16
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Abstract
Introduction: For the last few decades, electrolyte determinations in plasma or serum are carried out by reliable potentiometric methods. In recent years, a marked technical evolution has taken place, where the clinical analysis of common analytes (e.g. electrolytes) is partly moving from centralised clinical core laboratories to near-patient point-of-care testing. Methods: As the measuring principle used by point-of-care testing markedly differs from the one used in core laboratories, sodium results are not always interchangeable in critically ill patients due to the different sensitivity of the analytical methods for the electrolyte exclusion effect. Results: This effect mainly occurs in patients with decreased plasma protein values. The observed differences in generated test results might significantly affect the judgment and the treatment of electrolyte disturbances. As technical solutions are not likely to occur in the near future, clinicians and laboratorians should be well aware of this growing problem. Mathematical correction of the sodium results for plasma protein concentration may resolve the problem to a certain extent. Discussion: Although electrolyte determinations are generally very reliable, analytical interferences can occur for sodium rarely, mainly due to contamination by surfactants, benzalkonium in particular. For potassium, the major problem is hemolysis. To a lesser extent, leukocyte lysis and thrombocytopenia may also interfere. For chloride determination, the selectivity of the electrodes used is not ideal. Occasionally, false positive signals can be observed in presence of interfering ions (e.g. bromide).
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17
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Virk MS, Dean NP, Wong ECC. Severe Underestimation of Serum Na following IVIG Treatment. Lab Med 2018; 49:372-376. [PMID: 29897485 DOI: 10.1093/labmed/lmy025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Current chemistry analyzers measure ion concentration using ion- selective electrodes; however, may differ in the specific technology at the bedside versus the central laboratory. Instruments utilized for point-of-care testing (POCT) at the bedside use direct ion-selective electrodes, whereas central-laboratory analyzers use indirect ion-selective electrodes. Under most circumstances, these instruments will deliver the same result; however, various substances can cause interferences in one or the other. An 18-year-old Hispanic woman with a history of immune thrombocytopenic purpura (ITP) presented at Children's National Medical Center (CNMC) with a severe headache and required intravenous immunoglobulin (IVIG) therapy. Because a discrepancy developed between her point-of-care and central-laboratory sodium values, another instrument was used to retest the central-laboratory plasma specimens. The results were more in agreement with those from the point-of-care instrument and revealed a unique interference in sodium measurement related to IVIG use.
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Affiliation(s)
- Mrigender S Virk
- Department of Pathology and Laboratory Medicine, Medstar Georgetown University Hospital, Washington, DC
| | - Nathan P Dean
- Division of Critical Care Medicine, Children's National Medical Center, Washington, DC
| | - Edward C C Wong
- Division of Laboratory Medicine and Hematology, Children's National Medical Center, Washington, DC
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18
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Affiliation(s)
- Gregorio Paolo Milani
- Pediatric Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico and Department of Clinical Sciences and Community Health, Universita degli Studi di Milano, Milan, Italy
| | | | - Sebastiano Ag Lava
- Department of Pediatric Cardiology, Inselspital, University Children's Hospital of Bern, Bern, Switzerland.,Department of Pediatrics, Inselspital, Universitatsspital Bern, Bern, Switzerland
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19
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Garcia RA, Vanelli CP, Pereira Junior ODS, Corrêa JODA. Comparative analysis for strength serum sodium and potassium in three different methods: Flame photometry, ion-selective electrode (ISE) and colorimetric enzymatic. J Clin Lab Anal 2018; 32:e22594. [PMID: 29921038 DOI: 10.1002/jcla.22594] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 05/29/2018] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Hydroelectrolytic disorders are common in clinical situations and may be harmful to the patient, especially those involving plasma sodium and potassium dosages. Among the possible methods for the dosages are flame photometry, ion-selective electrode (ISE) and colorimetric enzymatic method. METHODS We analyzed 175 samples in the three different methods cited from patients attending the laboratory of the University Hospital of the Federal University of Juiz de Fora. The values obtained were statistically treated using SPSS 19.0 software. The present study aims to evaluate the impact of the use of these different methods in the determination of plasma sodium and potassium. RESULTS The averages obtained for sodium and potassium measurements by flame photometry were similar (P > .05) to the means obtained for the two electrolytes by ISE. The averages obtained by the colorimetric enzymatic method presented statistical difference in relation to ISE, both for sodium and potassium. In the correlation analysis, both flame photometry and colorimetric enzymatic showed a strong correlation with the ISE method for both dosages. CONCLUSION At the first time in the same work sodium and potassium were analyzed by three different methods and the results allowed us to conclude that the methods showed a positive and strong correlation, and can be applied in the clinical routine.
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Affiliation(s)
- Rafaela Alvim Garcia
- Faculty of Phamarcy, Department of Pharmaceutical Sciences, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil
| | - Chislene Pereira Vanelli
- Faculty of Medicine, Post graduate Program in Health Sciences, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil
| | | | - José Otávio do Amaral Corrêa
- Faculty of Phamarcy, Department of Pharmaceutical Sciences, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil.,Faculty of Medicine, Post graduate Program in Health Sciences, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil
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20
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Lavagno C, Milani GP, Uestuener P, Simonetti GD, Casaulta C, Bianchetti MG, Fare PB, Lava SAG. Hyponatremia in children with acute respiratory infections: A reappraisal. Pediatr Pulmonol 2017; 52:962-967. [PMID: 28267276 DOI: 10.1002/ppul.23671] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 12/19/2016] [Accepted: 12/29/2016] [Indexed: 12/18/2022]
Abstract
Hyponatremia (<135 mmol/L), typically associated with an elevated anti-diuretic hormone level, is common among children admitted with bronchiolitis, pneumonia, or pulmonary exacerbation of cystic fibrosis. The main consequences of acute hyponatremia include cerebral edema and Ayus-Arieff pulmonary edema. A widespread belief is that, in children with pneumonia or bronchiolitis, hyponatremia results from inappropriate anti-diuresis. By contrast, the pathogenic role of extracellular fluid volume depletion or decreased effective circulating blood volume is underscored. Considering the prevalence of hyponatremia, sodium determination is advised on admission in children diagnosed with bronchiolitis, pneumonia, or pulmonary exacerbation of cystic fibrosis. There is no necessity to do anything beyond reassessing the appropriateness of fluid therapy in cases with mild (130-134 mmol/L) hyponatremia. In children with sodium <130 mmol/L, the underlying etiology is sometimes evident from history and physical findings. Given that clinical assessment of fluid volume status is difficult in hyponatremia, further laboratory evaluation is often required in these patients. An increase in sodium level ≤6 mmol/L per day is currently considered the therapeutic goal in all cases. Emergency correction with a 2 mL/kg body weight bolus of 3.0% saline over 10-15 min intravenously is advised in cases with severe symptoms due to hyponatremia and in cases with symptoms, even if mild, due to a rapid-onset (<48 h) of hyponatremia (two additional doses are administered if the patient's condition does not improve).
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Affiliation(s)
- Camilla Lavagno
- Pediatric Department of Southern Switzerland, Bellinzona, Switzerland
| | - Gregorio P Milani
- Foundation IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Pediatric Emergency Department and Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
| | - Peter Uestuener
- Pediatric Department of Southern Switzerland, Bellinzona, Switzerland
| | | | - Carmen Casaulta
- Department of Pediatrics, University Children's Hospital of Bern, Inselspital, Bern, Switzerland
| | | | - Pietro B Fare
- Pediatric Department of Southern Switzerland, Bellinzona, Switzerland
| | - Sebastiano A G Lava
- Department of Pediatrics, University Children's Hospital of Bern, Inselspital, Bern, Switzerland.,Pediatric Pharmacology and Pharmacogenetics, Hôpital Robert Debré, Paris, France
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21
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Langelaan MLP, Kamp L, Zandijk E, Raijmakers MTM. Prevalence of pseudonatremia in a clinical laboratory - role of the water content. Clin Chem Lab Med 2017; 55:546-553. [PMID: 27676606 DOI: 10.1515/cclm-2016-0401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Accepted: 08/19/2016] [Indexed: 11/15/2022]
Abstract
BACKGROUND Sodium concentration is a frequently used marker to discriminate between differential diagnoses or for clinical follow-up. Pseudonatremia, as a result of indirect ion-selective electrode (ISE) measurements in automated chemistry analyzers, can lead to incorrect diagnosis and treatment. We investigated whether the estimated water content, based on total protein and lipid concentrations, can be used to reduce diagnoses of pseudonatremia. METHODS Indirect and direct ISE measurements of sodium were compared in blood samples from intensive care unit (ICU) (n = 98) and random non-ICU patients (n = 100). Differences between direct measurements using whole blood and lithium-heparin plasma were also determined. Water content, estimated by a linear combination of total protein and lipid concentrations, was used to correct indirectly measured sodium concentrations. The prevalence of pseudonatremia was evaluated in the ICU patient group. RESULTS An absolute difference of 3 mmol/L was observed between direct measurements using lithium-heparin plasma and whole blood, with higher concentrations in plasma. Additionally, we observed that differences between indirect and direct measurements displayed a linear relationship with the estimated water content. The prevalence of pseudohypernatremia after indirect measurements (32%) was reduced when measurements were corrected for water content (19%). CONCLUSIONS In critically ill patients, sodium concentrations should be preferably measured by direct measurements. Whole blood is the preferred material for these measurements. For routine sodium analyses in other patients, correction using the estimated water content appears promising in reducing the prevalence of pseudohypernatremia by indirect measurements.
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22
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Rondon-Berrios H, Argyropoulos C, Ing TS, Raj DS, Malhotra D, Agaba EI, Rohrscheib M, Khitan ZJ, Murata GH, Shapiro JI, Tzamaloukas AH. Hypertonicity: Clinical entities, manifestations and treatment. World J Nephrol 2017; 6:1-13. [PMID: 28101446 PMCID: PMC5215203 DOI: 10.5527/wjn.v6.i1.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 08/17/2016] [Accepted: 11/02/2016] [Indexed: 02/06/2023] Open
Abstract
Hypertonicity causes severe clinical manifestations and is associated with mortality and severe short-term and long-term neurological sequelae. The main clinical syndromes of hypertonicity are hypernatremia and hyperglycemia. Hypernatremia results from relative excess of body sodium over body water. Loss of water in excess of intake, gain of sodium salts in excess of losses or a combination of the two are the main mechanisms of hypernatremia. Hypernatremia can be hypervolemic, euvolemic or hypovolemic. The management of hypernatremia addresses both a quantitative replacement of water and, if present, sodium deficit, and correction of the underlying pathophysiologic process that led to hypernatremia. Hypertonicity in hyperglycemia has two components, solute gain secondary to glucose accumulation in the extracellular compartment and water loss through hyperglycemic osmotic diuresis in excess of the losses of sodium and potassium. Differentiating between these two components of hypertonicity has major therapeutic implications because the first component will be reversed simply by normalization of serum glucose concentration while the second component will require hypotonic fluid replacement. An estimate of the magnitude of the relative water deficit secondary to osmotic diuresis is obtained by the corrected sodium concentration, which represents a calculated value of the serum sodium concentration that would result from reduction of the serum glucose concentration to a normal level.
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23
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Goldwasser P, Roche-Recinos A, Barth RH. Graded interference with the direct potentiometric measurement of sodium by hemoglobin. Clin Biochem 2017; 50:440-443. [PMID: 28065682 DOI: 10.1016/j.clinbiochem.2016.12.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Revised: 12/23/2016] [Accepted: 12/23/2016] [Indexed: 01/27/2023]
Abstract
OBJECTIVES Sodium concentration is measured by either indirect (INa) or direct potentiometry (DNa), on chemistry and gas panels, respectively. A spurious difference between these methods (ΔNa=INa-DNa) can be confusing to the clinician. For example, variation in serum total protein (TP) is well known to selectively interfere with INa. Red cells have been suggested to interfere with DNa, but both positive and negative interference have been reported. In this study, the effect of gas panel hemoglobin (Hb) on ΔNa was examined. METHODS ΔNa was calculated in 772 pairs of closely-timed chemistry and gas panels (median: 4min. apart), retrospectively collected from our critical care units, with 1 pair per patient. Hb was treated as a categorical or continuous variable and tested for linear and non-linear effects, with adjustment for 3 known influences on ΔNa-TP, bicarbonate (tCO2), and the chemistry-gas panel glucose difference (ΔGlu). RESULTS Hb ranged from 3.5 to 22.0g/dL [35-220g/L]. In categorical analysis, ΔNa increased with Hb, and the effect was essentially linear. By simple regression, ΔNa rose 0.06±0.03[SE]mmol/L per 1g/dL [10g/L] increase in Hb (p<0.05), but confounding was suspected because Hb also correlated (p<10-3) with TP, tCO2, and ΔGlu. Using multiple regression to adjust for the confounders, ΔNa rose 0.15±0.03mmol/L per 1g/dL [10g/L] rise in Hb (p<10-6). CONCLUSIONS Increasing Hb spuriously decreases DNa and increases ΔNa. A linear correction for this artifact can reduce the discordance between INa and DNa, promoting their interchangeable use.
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Affiliation(s)
- Philip Goldwasser
- Department of Medicine, Veterans Affairs New York Harbor Healthcare System, 800 Poly Place, Brooklyn, NY 11209, USA.
| | - Andrea Roche-Recinos
- State University of New York, Downstate Medical Center, 450 Clarkson Ave., Brooklyn, NY 11203, USA
| | - Robert H Barth
- Department of Medicine, Veterans Affairs New York Harbor Healthcare System, 800 Poly Place, Brooklyn, NY 11209, USA
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24
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Lava SAG, Bianchetti MG, Milani GP. Testing Na + in blood. Clin Kidney J 2016; 10:147-148. [PMID: 28396732 PMCID: PMC5381209 DOI: 10.1093/ckj/sfw103] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 09/02/2016] [Indexed: 11/15/2022] Open
Abstract
Both direct potentiometry and indirect potentiometry are currently used for Na+ testing in blood. These measurement techniques show good agreement as long as protein and lipid concentrations in blood remain normal. In severely ill patients, indirect potentiometry commonly leads to relevant errors in Na+ estimation: 25% of specimens show a disagreement between direct and indirect potentiometry, which is ≥4 mmol/L (mostly spuriously elevated Na+ level due to low circulating albumin concentration). There is a need for increased awareness of the poor performance of indirect potentiometry in some clinical settings.
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Affiliation(s)
- Sebastiano A G Lava
- Department of Pediatrics, University Children's Hospital of Bern, Inselspital, Bern, Switzerland; Pediatric Pharmacology and Pharmacogenetics, Hôpital Robert Debré, Paris, France
| | - Mario G Bianchetti
- Pediatric Department of Southern Switzerland, Bellinzona, Switzerland; Università della Svizzera Italiana, Lugano, Switzerland
| | - Gregorio P Milani
- Foundation IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Pediatric Emergency Department, Milan, Italy
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25
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How to Solve the Underestimated Problem of Overestimated Sodium Results in the Hypoproteinemic Patient. Crit Care Med 2016; 44:e83-8. [PMID: 26465222 DOI: 10.1097/ccm.0000000000001304] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The availability of a fast and reliable sodium result is a prerequisite for the appropriate correction of a patient's fluid balance. Blood gas analyzers and core laboratory chemistry analyzers measure electrolytes via different ion-selective electrode methodology, that is, direct and indirect ion-selective electrodes, respectively. Sodium concentrations obtained via both methods are not always concordant. A comparison of results between both methods was performed, and the impact of the total protein concentration on the sodium concentration was investigated. Furthermore, we sought to develop an adjustment equation to correct between both ion-selective electrode methods. DESIGN A model was developed using a pilot study cohort (n = 290) and a retrospective patient cohort (n = 690), which was validated using a prospective patient cohort (4,006 samples). SETTING ICU and emergency department at Ghent University Hospital. PATIENTS Patient selection was based on the concurrent availability of routine blood gas Na⁺(direct) as well as core laboratory Na⁺(indirect) results. INTERVENTIONS In the pilot study, left-over blood gas syringes were collected for further laboratory analysis. MEASUREMENT AND MAIN RESULTS There was a significant negative linear correlation between Na⁺(indirect) and Na⁺(direct) relative to changes in total protein concentration (Pearson r = -0.69; p < 0.0001). In our setting, for each change of 10 g/L in total protein concentration, a deviation of ~1.3 mmol/L is observed with the Na⁺(indirect) result. Validity of our adjustment equation protein-corrected Na⁺(indirect) = Na⁺(indirect) - 10.53 + (0.1316 × total protein) was demonstrated on a prospective patient cohort. CONCLUSIONS As Na⁺(direct) measurements on a blood gas analyzer are not influenced by the total protein concentration in the sample, they should be preferentially used in patients with abnormal protein concentrations. However, as blood gas analyzers are not available at all clinical wards, the implementation of a protein-corrected sodium result might provide an acceptable alternative.
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26
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Oude Lansink-Hartgring A, Hessels L, Weigel J, de Smet AMGA, Gommers D, Panday PVN, Hoorn EJ, Nijsten MW. Long-term changes in dysnatremia incidence in the ICU: a shift from hyponatremia to hypernatremia. Ann Intensive Care 2016; 6:22. [PMID: 26983857 PMCID: PMC4794471 DOI: 10.1186/s13613-016-0124-x] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 03/02/2016] [Indexed: 12/18/2022] Open
Abstract
Background Dysnatremia is associated with adverse outcome in critically ill patients. Changes in patients or treatment strategies may have affected the incidence of dysnatremia over time. We investigated long-term changes in the incidence of dysnatremia and analyzed its association with mortality. Methods Over a 21-year period (1992–2012), all serum sodium measurements were analyzed retrospectively in two university hospital ICUs, up to day 28 of ICU admission for the presence of dysnatremia. The study period was divided into five periods. All serum sodium measurements were collected from the electronic databases of both ICUs. Serum sodium was measured at the clinical chemistry departments using standard methods. All sodium measurements were categorized in the following categories: <120, 120–124, 125–129, 130–134, 135–139, 140–145, 146–150, 151–155, 156–160, >160 mmol/L. Mortality was determined at 90 days after ICU admission. Results In 80,571 ICU patients, 913,272 serum sodium measurements were analyzed. A striking shift in the pattern of ICU-acquired dysnatremias was observed: The incidence of hyponatremia almost halved (47–25 %, p < 0.001), whereas the incidence of hypernatremia nearly doubled (13–24 %, p < 0.001). Most hypernatremias developed after ICU admission, and the incidence of severe hypernatremia (sodium > 155 mmol/L) increased dramatically over the years. On ICU day 10 this incidence was 0.7 % in the 1992–1996 period, compared to 6.3 % in the 2009–2012 period (p < 0.001). More severe dysnatremia was associated with significantly higher mortality throughout the 21-year study period (p < 0.001). Conclusions In two large Dutch cohorts, we observed a marked shift in the incidence of dysnatremia from hyponatremia to hypernatremia over two decades. As hypernatremia was mostly ICU acquired, this strongly suggests changes in treatment as underlying causes. This shift may be related to the increased use of sodium-containing infusions, diuretics, and hydrocortisone. As ICU-acquired hypernatremia is largely iatrogenic, it should be—to an important extent—preventable, and its incidence may be considered as an indicator of quality of care. Strategies to prevent hypernatremia deserve more emphasis; therefore, we recommend that further study should be focused on interventions to prevent the occurrence of dysnatremias during ICU stay. Electronic supplementary material The online version of this article (doi:10.1186/s13613-016-0124-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Annemieke Oude Lansink-Hartgring
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands.
| | - Lara Hessels
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
| | - Joachim Weigel
- Department of Intensive Care Adults, Erasmus MC, Rotterdam, The Netherlands
| | - Anne Marie G A de Smet
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
| | - Diederik Gommers
- Department of Intensive Care Adults, Erasmus MC, Rotterdam, The Netherlands
| | - Prashant V Nannan Panday
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Ewout J Hoorn
- Department of Internal Medicine, Erasmus MC, Rotterdam, The Netherlands
| | - Maarten W Nijsten
- Department of Critical Care, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
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27
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Liamis G, Filippatos TD, Elisaf MS. Evaluation and treatment of hypernatremia: a practical guide for physicians. Postgrad Med 2016; 128:299-306. [PMID: 26813151 DOI: 10.1080/00325481.2016.1147322] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Hypernatremia (serum sodium concentration >145 mEq/L) is a common electrolyte disorder with increased morbidity and mortality especially in the elderly and critically ill patients. The review presents the main pathogenetic mechanisms of hypernatremia, provides specific directions for the evaluation of patients with increased sodium levels and describes a detailed algorithm for the proper correction of hypernatremia. Furthermore, two representative cases of hypovolemic and hypervolemic hypernatremia are presented along with practical clues for their proper evaluation and treatment. Accurate diagnosis and appropriate treatment is crucial since undercorrection or overcorrection of hypernatremia are both associated with poor patients' prognosis.
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Affiliation(s)
- George Liamis
- a Department of Internal Medicine , School of Medicine, University of Ioannina , Ioannina , Greece
| | - Theodosios D Filippatos
- a Department of Internal Medicine , School of Medicine, University of Ioannina , Ioannina , Greece
| | - Moses S Elisaf
- a Department of Internal Medicine , School of Medicine, University of Ioannina , Ioannina , Greece
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28
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Rafat C, Flamant M, Gaudry S, Vidal-Petiot E, Ricard JD, Dreyfuss D. Hyponatremia in the intensive care unit: How to avoid a Zugzwang situation? Ann Intensive Care 2015; 5:39. [PMID: 26553121 PMCID: PMC4639545 DOI: 10.1186/s13613-015-0066-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 09/02/2015] [Indexed: 12/11/2022] Open
Abstract
Hyponatremia is a common
electrolyte derangement in the setting of the intensive care unit. Life-threatening neurological complications may arise not only in case of a severe (<120 mmol/L) and acute fall of plasma sodium levels, but may also stem from overly rapid correction of hyponatremia. Additionally, even mild hyponatremia carries a poor short-term and long-term prognosis across a wide range of conditions. Its multifaceted and intricate physiopathology may seem deterring at first glance, yet a careful multi-step diagnostic approach may easily unravel the underlying mechanisms and enable physicians to adopt the adequate measures at the patient’s bedside. Unless hyponatremia is associated with obvious extracellular fluid volume increase such as in heart failure or cirrhosis, hypertonic saline therapy is the cornerstone of the therapeutic of profound or severely symptomatic hyponatremia. When overcorrection of hyponatremia occurs, recent data indicate that re-lowering of plasma sodium levels through the infusion of hypotonic fluids and the cautious use of desmopressin acetate represent a reasonable strategy. New therapeutic options have recently emerged, foremost among these being vaptans, but their use in the setting of the intensive care unit remains to be clarified.
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Affiliation(s)
- Cédric Rafat
- AP-HP, Service de Réanimation Médico-Chirurgicale, Hôpital Louis Mourier, Colombes, France. .,AP-HP, Urgences Néphrologiques et Transplantation Rénale, Hôpital Tenon, Paris, France.
| | - Martin Flamant
- AP-HP, Service de Physiologie Rénale, Hôpital Bichat, Paris, France. .,Université Paris Diderot, Sorbonne Paris Cité, Paris, France. .,INSERM, U1149, Centre de Recherche sur l'Inflammation, Paris, France.
| | - Stéphane Gaudry
- AP-HP, Service de Réanimation Médico-Chirurgicale, Hôpital Louis Mourier, Colombes, France. .,Université Paris Diderot, Sorbonne Paris Cité, Paris, France. .,ECEVE UMR 1123, ECEVE, Paris, France.
| | - Emmanuelle Vidal-Petiot
- AP-HP, Service de Physiologie Rénale, Hôpital Bichat, Paris, France. .,Université Paris Diderot, Sorbonne Paris Cité, Paris, France. .,INSERM, U1149, Centre de Recherche sur l'Inflammation, Paris, France.
| | - Jean-Damien Ricard
- AP-HP, Service de Réanimation Médico-Chirurgicale, Hôpital Louis Mourier, Colombes, France. .,Université Paris Diderot, Sorbonne Paris Cité, Paris, France. .,INSERM UMR 1137, IAME, Paris, France.
| | - Didier Dreyfuss
- AP-HP, Service de Réanimation Médico-Chirurgicale, Hôpital Louis Mourier, Colombes, France. .,Université Paris Diderot, Sorbonne Paris Cité, Paris, France. .,INSERM UMR 1137, IAME, Paris, France.
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29
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Braconnier A, Vrigneaud L, Bertocchio JP. [Hyponatremias: From pathophysiology to treatments. Review for clinicians]. Nephrol Ther 2015; 11:201-12. [PMID: 26095871 DOI: 10.1016/j.nephro.2015.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 04/22/2015] [Accepted: 04/22/2015] [Indexed: 10/23/2022]
Abstract
Hyponatremia could be defined as a public health topic: too many patients are concerned in both hospitalized and general populations; hyponatremia induces lots of clinical outcomes and a great economic burden. Its pathophysiology involves thirst regulation (hypotonic water intakes) and losses regulation (through the kidney under vasopressin control). Diagnostic approach should insure that hyponatremia reflects hypo-osmolality and hypotonicity: first, a false hyponatremia should be ruled out, then a non-hypotonic one. Next step is clinic: extracellular status should be evaluated. When increased, any edematous status should be evoked: heart failure, liver cirrhosis or nephrotic syndrome. When decreased, any cause of extracellular dehydration should be evoked: natriuresis could help distinguishing between renal (adrenal insufficiency, diuretics use or salt-losing nephropathy) or extrarenal (digestive mostly) etiologies. When clinically normal, a secretion of inappropriate antidiuretic hormone (SIADH) should be evoked, once hypothyroidism or hypoadrenocorticism have been ruled out. Therapy depends on the severity of the clinical impact. From extracellular rehydration, through fluid restriction, the paraneoplastic and heart failure-induced SIADH benefit from a new class of drug, available among the therapeutic strategies: aquaretics act through antidiuretic hormone receptor antagonism (vaptans). Their long-term benefits still have to be proven but it is a significant step forward in the treatment of hyponatremias.
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Affiliation(s)
- Antoine Braconnier
- Service de néphrologie, hémodialyse, transplantation, hôpital Maison-Blanche, CHU de Reims, avenue Cognacq-Jay, 51092 Reims cedex, France; Faculté de médecine, université Reims Champagne Ardenne, 51000 Reims, France; Club des jeunes néphrologues, 11, rue Auguste-Mourcou, 59000 Lille, France
| | - Laurence Vrigneaud
- Club des jeunes néphrologues, 11, rue Auguste-Mourcou, 59000 Lille, France; Service de néphrologie, médecine interne, centre hospitalier de Valenciennes, avenue Désandrouin, CS 50479, 59322 Valenciennes cedex, France
| | - Jean-Philippe Bertocchio
- Club des jeunes néphrologues, 11, rue Auguste-Mourcou, 59000 Lille, France; Service d'explorations fonctionnelles rénales et métaboliques, hôpital européen Georges-Pompidou, 20, rue Leblanc, 75908 Paris cedex, France; Université Paris Descartes, 75006 Paris, France.
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