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Fincher S, Gibbons K, Johnson K, Trnka P, Mattke AC. Urinary Chloride Excretion Postcardiopulmonary Bypass in Pediatric Patients-A Pilot Study. J Pediatr Intensive Care 2024; 13:80-86. [PMID: 38571987 PMCID: PMC10987220 DOI: 10.1055/s-0041-1736549] [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: 06/06/2021] [Accepted: 09/10/2021] [Indexed: 10/20/2022] Open
Abstract
The aim of this study was to describe renal chloride metabolism following cardiopulmonary bypass (CPB) surgery in pediatric patients. A prospective observational trial in a tertiary pediatric intensive care unit (PICU) with 20 recruited patients younger than 2 years following CPB surgery was conducted. Urinary electrolytes, plasma urea, electrolytes, creatinine, and arterial blood gases were collected preoperatively, on admission to PICU and at standardized intervals thereafter. The urinary and plasma strong ion differences (SID) were calculated from these results at each time point. Fluid input and output and electrolyte and drug administration were also recorded. Median chloride administration was 67.7 mmol/kg over the first 24 hours. Urinary chloride (mmol/L; median interquartile range [IQR]) was 30 (19, 52) prior to surgery, 15 (15, 65) on admission, and remained below baseline until 24 hours. Plasma chloride (mmol/L; median [IQR]) was 105 (98, 107) prior to surgery and 101 (101, 106) on admission to PICU. It then increased from baseline, but remained within normal limits, for the remainder of the study. The urinary SID increased from 49.8 (19.1, 87.2) preoperatively to a maximum of 122.7 (92.5, 151.8) at 6 hours, and remained elevated until 48 hours. Plasma and urinary chloride concentrations were not associated with the development of acute kidney injury. Urinary chloride excretion is impaired after CPB. The urinary SID increase associated with the decrease in chloride excretion suggests impaired production and/or excretion of ammonium by the nephron following CPB, with gradual recovery postoperatively.
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Affiliation(s)
- Sophie Fincher
- Department of Pediatric Intensive Care, Queensland Children's Hospital, Brisbane, Australia
- Pediatric Critical Care Research Group, Brisbane, Australia
| | - Kristen Gibbons
- Pediatric Critical Care Research Group, Brisbane, Australia
- Child Health Research Centre, The University of Queensland, Brisbane, Australia
| | - Kerry Johnson
- Department of Pediatric Intensive Care, Queensland Children's Hospital, Brisbane, Australia
- Pediatric Critical Care Research Group, Brisbane, Australia
- Child Health Research Centre, The University of Queensland, Brisbane, Australia
| | - Peter Trnka
- School of Medicine, The University of Queensland, Brisbane, Australia
- Queensland Child and Adolescent Renal Service, Queensland Children's Hospital, Brisbane, Australia
| | - Adrian C. Mattke
- Department of Pediatric Intensive Care, Queensland Children's Hospital, Brisbane, Australia
- Pediatric Critical Care Research Group, Brisbane, Australia
- Child Health Research Centre, The University of Queensland, Brisbane, Australia
- School of Medicine, The University of Queensland, Brisbane, Australia
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Gomez DE, Bedford S, Darby S, Palmisano M, MacKay RJ, Renaud DL. Acid-base disorders in sick goats and their association with mortality: A simplified strong ion difference approach. J Vet Intern Med 2020; 34:2776-2786. [PMID: 33140905 PMCID: PMC7694813 DOI: 10.1111/jvim.15956] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 10/23/2020] [Accepted: 10/23/2020] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVES To investigate the acid-base status of sick goats using the simplified strong ion difference (sSID) approach, to establish the quantitative contribution of sSID variables to changes in blood pH and HCO3 - and to determine whether clinical, acid-base, and biochemical variables on admission are associated with the mortality of sick goats. ANIMALS One hundred forty-three sick goats. METHODS Retrospective study. Calculated sSID variables included SID using 6 electrolytes unmeasured strong ions (USI) and the total nonvolatile buffer ion concentration in plasma (Atot ). The relationship between measured blood pH and HCO3 - , and the sSID variables was examined using forward stepwise linear regression. Cox proportional hazard models were constructed to assess associations between potential predictor variables and mortality of goats during hospitalization. RESULTS Hypocapnia, hypokalemia, hyperchloremia, hyperlactatemia, and hyperproteinemia were common abnormalities identified in sick goats. Respiratory alkalosis, strong ion acidosis, and Atot acidosis were acid-base disorders frequently encountered in sick goats. In sick goats, the sSID variables explained 97% and 100% of the changes in blood pH and HCO3 - , respectively. The results indicated that changes in the respiratory rate (<16 respirations per minute), USI, and pH at admission were associated with increased hazard of hospital mortality in sick goats. CONCLUSIONS AND CLINICAL IMPORTANCE The sSID approach is a useful methodology to quantify acid-base disorders in goats and to determine the mechanisms of their development. Clinicians should consider calculation of USI in sick goats as part of the battery of information required to establish prognosis.
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Affiliation(s)
- Diego E. Gomez
- Department of Large Animal Clinical SciencesCollege of Veterinary Medicine, University of FloridaGainesvilleFloridaUSA
- Department of Clinical StudiesOntario Veterinary College, University of GuelphGuelphOntarioCanada
| | - Sofia Bedford
- Department of Clinical StudiesOntario Veterinary College, University of GuelphGuelphOntarioCanada
| | - Shannon Darby
- Department of Large Animal Clinical SciencesCollege of Veterinary Medicine, University of FloridaGainesvilleFloridaUSA
| | - Megan Palmisano
- Department of Large Animal Clinical SciencesCollege of Veterinary Medicine, University of FloridaGainesvilleFloridaUSA
| | - Robert J. MacKay
- Department of Large Animal Clinical SciencesCollege of Veterinary Medicine, University of FloridaGainesvilleFloridaUSA
| | - David L. Renaud
- Department of Population MedicineOntario Veterinary College, University of GuelphGuelphOntarioCanada
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Zingg T, Bhattacharya B, Maerz LL. Metabolic acidosis and the role of unmeasured anions in critical illness and injury. J Surg Res 2017; 224:5-17. [PMID: 29506851 DOI: 10.1016/j.jss.2017.11.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 09/04/2017] [Accepted: 11/03/2017] [Indexed: 12/31/2022]
Abstract
Acid-base disorders are frequently present in critically ill patients. Metabolic acidosis is associated with increased mortality, but it is unclear whether as a marker of the severity of the disease process or as a direct effector. The understanding of the metabolic component of acid-base derangements has evolved over time, and several theories and models for precise quantification and interpretation have been postulated during the last century. Unmeasured anions are the footprints of dissociated fixed acids and may be responsible for a significant component of metabolic acidosis. Their nature, origin, and prognostic value are incompletely understood. This review provides a historical overview of how the understanding of the metabolic component of acid-base disorders has evolved over time and describes the theoretical models and their corresponding tools applicable to clinical practice, with an emphasis on the role of unmeasured anions in general and several specific settings.
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Affiliation(s)
- Tobias Zingg
- Department of Surgery, Section of General Surgery, Trauma & Surgical Critical Care, Yale University School of Medicine, New Haven, Connecticut.
| | - Bishwajit Bhattacharya
- Department of Surgery, Section of General Surgery, Trauma & Surgical Critical Care, Yale University School of Medicine, New Haven, Connecticut
| | - Linda L Maerz
- Department of Surgery, Section of General Surgery, Trauma & Surgical Critical Care, Yale University School of Medicine, New Haven, Connecticut
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Morgan TJ, Anstey CM, Wolf MB. A head to head evaluation of 8 biochemical scanning tools for unmeasured ions. J Clin Monit Comput 2016; 31:449-457. [PMID: 27072989 DOI: 10.1007/s10877-016-9861-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2015] [Accepted: 03/08/2016] [Indexed: 12/31/2022]
Abstract
We aimed to evaluate the sensitivity and specificity of 8 biochemical scanning tools in signalling the presence of unmeasured anions. We used blood gas and biochemical data from 15 patients during and after cardio-pulmonary bypass. Sampling time-points were pre-bypass (T1), 2 min post equilibration with priming fluid containing acetate and gluconate anions (T2), late bypass (T3) and 4 h after surgery (T4). We calculated the anion gap (AG), albumin-corrected anion gap (AGc), whole blood base excess (BE) gap, plasma BE gap, standard BE gap and the strong ion gap (SIG), plus 2 new indices-the unmeasured ion index (UIX) and unmeasured plasma anions according to the interstitial, plasma and erythrocyte acid-base model (IPEua). Total measured plasma concentrations of acetate and gluconate [XA] were proxies for unmeasured plasma anions. [XA] values (mmol/L) were 1.41 (0.87) at T1, 11.73 (3.28) at T2, 4.80 (1.49) at T3 and 1.36 (0.73) at T4. Corresponding [albumin] values (g/L) were 32.3 (2.0), 19.8 (2.6), 21.3 (2.5) and 29.1 (2.3) respectively. Only the AG failed to increase significantly at T2 in response to a mean [XA] surge of >10 mEq/L. At an [XA] threshold of 6 mEq/L, areas under receiver -operator characteristic curves in rank order were IPEua and UIX (0.88 and 0.87 respectively), SIG (0.81), AGc (0.79), standard BE gap (0.77), plasma BE gap (0.71), BE gap (0.70) and AG (0.59). Similar ranking hierarchies applied to positive and negative predictive values. We conclude that during acute hemodilution UIX and IPEua are superior to the anion gap (with and without albumin correction) and 4 other indices as scanning tools for unmeasured anions.
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Affiliation(s)
- Thomas J Morgan
- Intensive Care Unit, Mater Research, Mater Health Services, University of Queensland, Salmon Building, Raymond Terrace, South Brisbane, QLD, 4101, Australia.
| | - Chris M Anstey
- Department of Intensive Care, Sunshine Coast Hospital, Nambour, QLD, 4560, Australia.,University of Queensland, Brisbane, QLD, 4101, Australia
| | - Matthew B Wolf
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, SC, 29209, USA
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Du W, Long Y, Wang XT, Liu DW. The Use of the Ratio between the Veno-arterial Carbon Dioxide Difference and the Arterial-venous Oxygen Difference to Guide Resuscitation in Cardiac Surgery Patients with Hyperlactatemia and Normal Central Venous Oxygen Saturation. Chin Med J (Engl) 2016; 128:1306-13. [PMID: 25963349 PMCID: PMC4830308 DOI: 10.4103/0366-6999.156770] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Background: After cardiac surgery, central venous oxygen saturation (ScvO2) and serum lactate concentration are often used to guide resuscitation; however, neither are completely reliable indicators of global tissue hypoxia. This observational study aimed to establish whether the ratio between the veno-arterial carbon dioxide and the arterial-venous oxygen differences (P(v−a)CO2/C(a−v)O2) could predict whether patients would respond to resuscitation by increasing oxygen delivery (DO2). Methods: We selected 72 patients from a cohort of 290 who had undergone cardiac surgery in our institution between January 2012 and August 2014. The selected patients were managed postoperatively on the Intensive Care Unit, had a normal ScvO2, elevated serum lactate concentration, and responded to resuscitation by increasing DO2 by >10%. As a consequence, 48 patients responded with an increase in oxygen consumption (VO2) while VO2 was static or fell in 24. Results: At baseline and before resuscitative intervention in postoperative cardiac surgery patients, a P(v−a)CO2/C(a−v)O2 ratio ≥1.6 mmHg/ml predicted a positive VO2 response to an increase in DO2 of >10% with a sensitivity of 68.8% and a specificity of 87.5%. Conclusions: P(v−a)CO2/C(a−v)O2 ratio appears to be a reliable marker of global anaerobic metabolism and predicts response to DO2 challenge. Thus, patients likely to benefit from resuscitation can be identified promptly, the P(v−a)CO2/C(a−v)O2 ratio may, therefore, be a useful resuscitation target.
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Affiliation(s)
| | | | | | - Da-Wei Liu
- Department of Critical Care Medicine, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China
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Affiliation(s)
- Miriam R Fine-Goulden
- Paediatric Intensive Care Unit, Evelina Children's Hospital, Guy's and St. Thomas' NHS Foundation Trust, , London
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Kneidinger N, Funk GC, Lindner G, Drolz A, Schenk P, Fuhrmann V. Unmeasured anions are associated with short-term mortality in patients with hypoxic hepatitis. Wien Klin Wochenschr 2013; 125:474-80. [DOI: 10.1007/s00508-013-0400-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Accepted: 06/23/2013] [Indexed: 02/06/2023]
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Lindsay AJ, Xu M, Sessler DI, Blackstone EH, Bashour CA. Lactate clearance time and concentration linked to morbidity and death in cardiac surgical patients. Ann Thorac Surg 2012; 95:486-92. [PMID: 22959571 DOI: 10.1016/j.athoracsur.2012.07.020] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 07/05/2012] [Accepted: 07/10/2012] [Indexed: 02/07/2023]
Abstract
BACKGROUND Early predictors of morbidity after cardiac operations are lacking. Elevated lactate concentrations in the immediate postoperative period reflect unmet metabolic demand and may be associated with outcome. This study examined the association between early plasma lactate concentrations and outcome after cardiac operations. METHODS As a retrospective cohort investigation, patient information was obtained from the Cardiovascular Information and the Anesthesiology Institute's patient registries. Inclusion criteria were all adult cardiac surgical patients undergoing isolated coronary artery bypass grafting or valve procedures, or coronary artery bypass grafting with a valve procedure, from January 1, 2008, to August 7, 2008 (arterial lactate values were added to the patient registry beginning January 1, 2008). RESULTS Lactate concentrations during the initial 12 postoperative hours of a patient's stay in the cardiovascular intensive care unit were averaged (mean lactate concentration), and linear regression concentrations over time were used to predict when the lactate concentration would reach 1.5 mmol/L in individual patients (predicted lactate clearance time). We also considered the product of the mean and clearance (product value). Predicted lactate clearance time, mean lactate concentration, and product value were associated with any type of reoperation, death, and a set of composite outcomes (p < 0.001 for each). The accuracy of these indices was moderate to good, with the highest C statistic (for product value) being 0.82. CONCLUSIONS Predicted lactate clearance time, mean lactate concentration, and product value are each associated with death, any type of reoperation, and a set of composite outcomes in patients undergoing coronary artery bypass grafting or valve operations, or both. Product value provided the best early prognostic guidance in individual patients.
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Affiliation(s)
- Aaron J Lindsay
- Department of Outcomes Research, Cleveland Clinic, Cleveland, Ohio 44195, USA
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Park SJ, Kim HS, Byon HJ, Kim CS, Cheong IY, Kim JT. Intraoperative Plasma Lactate as an Early Indicator of Major Postoperative Events in Pediatric Cardiac Patients. TOHOKU J EXP MED 2012; 228:239-45. [DOI: 10.1620/tjem.228.239] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Seong-Joo Park
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital
| | - Hee-Soo Kim
- Department of Anesthesiology and Pain Medicine, Seoul National University Hospital
| | - Hyo-Jin Byon
- Department of Anesthesiology and Pain Medicine, Inha National University Hospital
| | - Chong-Sung Kim
- Department of Anesthesiology and Pain Medicine, Seoul National University Hospital
| | - Il-Young Cheong
- Department of Anesthesiology and Pain Medicine, Kangwon National University Hospital
| | - Jin-Tae Kim
- Department of Anesthesiology and Pain Medicine, Seoul National University Hospital
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Abstract
BACKGROUND : The intra- and postoperative monitoring of lactate and acid-base has been advocated in pediatric cardiac critical care as surrogate markers of cardiac output, oxygen delivery, and cellular perfusion. Many clinicians use lactate and base excess routinely as markers of tissue perfusion and to assess the effectiveness of their intervention. This review discusses the strengths and weaknesses of using these measurements in pediatric cardiac critical care. METHODOLOGY : A search of MEDLINE, EMBASE, PubMed, and the Cochrane Database was conducted to find controlled trials of lactate and base excess. Adult and pediatric data were considered. Guidelines published by the Society of Critical Care Medicine, the American Heart Association, the American Academy of Pediatrics, and the International Liaison Committee on Resuscitation were reviewed including further review of references cited. RESULTS AND CONCLUSIONS : Many factors other than tissue hypoxia may contribute to hyperlactemia in critical illness. Although the presence of hyperlactemia on admission appears to be associated with intensive care unit mortality and morbidity in some retrospective analyses, significant overlap between survivors and nonsurvivors means that nonsurvivors cannot be predicted from admission lactate measurement. Persistently elevated postoperative lactate is associated with increased morbidity and mortality in the pediatric cardiac population. To date there is no randomized control trial of goal-directed therapy in adult or pediatric cardiac care that includes normalization of lactate as a target. Overall equivalent time measurements of base excess, anion gap, and pH have a low predictive value for morbidity and mortality in children after cardiac surgery. Lactate is one of a cluster of markers of cellular perfusion and oxygen delivery. Alone, as a single measurement, it has minimal predictive value and is nondiscriminatory for survival.
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Kneidinger N, Lindner G, Fuhrmann V, Doberer D, Dunkler D, Schneeweiss B, Funk GC. Acute phase proteins do not account for unmeasured anions in critical illness. Eur J Clin Invest 2007; 37:820-5. [PMID: 17764464 DOI: 10.1111/j.1365-2362.2007.01857.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND The increasingly recognized prognostic impact of the strong ion gap in critical illness is in contrast to its largely unknown chemical nature. Experimental and clinical evidence suggest that acute phase proteins might account for elevation of the strong ion gap. The hypothesis of this investigation was that acute phase proteins account for strong ion gap in critically ill patients. MATERIALS AND METHODS The charges of the two acute phase proteins C-reactive protein and fibrinogen were estimated by a computer model. Additionally, 142 patients admitted to a medical intensive care unit of a university hospital were studied prospectively during a six month period. Serial daily observations were recorded and classified according to the systemic inflammatory state. The acute phase proteins C-reactive protein and fibrinogen were measured and the strong ion gap was calculated from the measured acid-base variables. RESULTS The approximated mean charges of C-reactive protein and fibrinogen at a pH of 7.4 are -4.0 and -13.6 per molecule, respectively. Therefore, their negative charge is too small to explain the elevated strong ion gap even during a substantial increase of C-reactive protein and fibrinogen due to an acute-phase reaction. Moreover, C-reactive protein did not correlate with the strong ion gap when partialized for creatinine (R = 0.02, P = 0.567). Fibrinogen did not correlate with the strong ion gap. Creatinine correlated with the strong ion gap (R = 0.42, P < 0.001). Neither systemic inflammatory state nor increasing C-reactive protein levels were associated with an increasing strong ion gap. CONCLUSION Acute phase proteins do not account for an elevated strong ion gap in critically ill patients.
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Affiliation(s)
- N Kneidinger
- Intensive Care Unit 13H1, Medical University of Vienna, Austria.
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Bibliography. Current world literature. Cardiovascular medicine. Curr Opin Pediatr 2007; 19:601-6. [PMID: 17885483 DOI: 10.1097/mop.0b013e3282f12851] [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: 11/25/2022]
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Funk GC. Das Säure-Basen-Modell nach Stewart. Wien Klin Wochenschr 2007; 119:390-403. [PMID: 17671819 DOI: 10.1007/s00508-007-0811-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2007] [Accepted: 05/03/2007] [Indexed: 01/18/2023]
Abstract
In addition to paCO(2), Stewart's acid base model takes into account the influence of albumin, inorganic phosphate, electrolytes and lactate on acid-base equilibrium. It allows a comprehensive and quantitative analysis of acid-base disorders. Particularly simultaneous and mixed metabolic acid-base disorders, which are common in critically ill patients, can be assessed. Stewart's approach is therefore a valuable tool in addition to the customary acid-base approach based on bicarbonate or base excess. However, some chemical aspects of Stewart's approach remain controversial.
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