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Normal saline versus balanced crystalloids in patients with prerenal acute kidney injury and pre-existing chronic kidney disease. ROMANIAN JOURNAL OF INTERNAL MEDICINE = REVUE ROUMAINE DE MEDECINE INTERNE 2023; 61:98-105. [PMID: 36801001 DOI: 10.2478/rjim-2023-0007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Indexed: 02/20/2023]
Abstract
Introduction Normal saline (N/S) and Ringer's-Lactate (L/R), are administered in everyday clinical practice. Despite that, N/S increases the risk of sodium overload and hyperchloremic metabolic acidosis. In contrast, L/R has lower sodium content, significantly less chloride and contains lactates. In this study we compare the efficacy of L/R versus N/S administration in patients with prerenal acute kidney injury (AKI) and pre-established chronic kidney disease (CKD). Methods In this prospective open-label study we included patients with prerenal AKI and previously known CKD stage III-V without need for dialysis. Patients with other forms of AKI, hypervolemia or hyperkalemia were excluded. Patients received either N/S or L/R intravenously at a dose of 20 ml/kg body-weight/day. We studied kidney function at discharge and at 30 days, duration of hospitalization, acid-base balance and the need for dialysis. Results We studied 38 patients and 20 were treated with N/S. Kidney function improvement during hospitalization and at 30 days after discharge, was similar between the two groups. Duration of hospitalization was also similar. Anion-gap improvement as expressed with Δanion-gap between discharge and admission day was higher in those patients that received L/R in comparison to those that received N/S and pH increase (ΔpH) was slightly higher in the L/R group. No patient required dialysis. Conclusions Administration of L/R or N/S to patients with prerenal AKI and pre-established CKD had no significant difference in short or long term kidney function but L/R showed a better profile in acid-base balance improvement and Cl- overload in comparison to N/S.
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2
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Zadek F, Giudici G, Ferraris Fusarini C, Ambrosini MT, di Modugno A, Scaravilli V, Zanella A, Fumagalli R, Stocchetti N, Calderini E, Langer T. Cerebrospinal fluid and arterial acid-base equilibria in spontaneously breathing third-trimester pregnant women. Br J Anaesth 2022; 129:726-733. [PMID: 36096944 PMCID: PMC9642833 DOI: 10.1016/j.bja.2022.07.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/17/2022] [Accepted: 07/10/2022] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Acid-base status in full-term pregnant women is characterised by hypocapnic alkalosis. Whether this respiratory alkalosis is primary or consequent to changes in CSF electrolytes is not clear. METHODS We enrolled third-trimester pregnant women (pregnant group) and healthy, non-pregnant women of childbearing age (controls) undergoing spinal anaesthesia for Caesarean delivery and elective surgery, respectively. Electrolytes, strong ion difference (SID), partial pressure of carbon dioxide ( [Formula: see text] ), and pH were measured in simultaneously collected CSF and arterial blood samples. RESULTS All pregnant women (20) were hypocapnic, whilst only four (30%) of the controls (13) had an arterial [Formula: see text] <4.7 kPa (P<0.001). The incidence of hypocapnic alkalosis was higher in the pregnant group (65% vs 8%; P=0.001). The CSF-to-plasma Pco2 difference was significantly higher in pregnant women (1.5 [0.3] vs 1.0 [0.4] kPa; P<0.001), mainly because of a decrease in arterial Pco2 (3.9 [0.3] vs 4.9 [0.5] kPa; P<0.001). Similarly, the CSF-to-plasma difference in SID was less negative in pregnant women (-7.8 [1.4] vs -11.4 [2.3] mM; P<0.001), mainly because of a decreased arterial SID (31.5 [1.2] vs 36.1 [1.9] mM; P<0.001). The major determinant of the reduced plasma SID of pregnant women was a relative increase in plasma chloride compared with sodium. CONCLUSIONS Primary hypocapnic alkalosis characterises third-trimester pregnant women leading to chronic acid-base adaptations of CSF and plasma. The compensatory SID reduction, mainly sustained by an increase in chloride concentration, is more pronounced in plasma than in CSF, as the decrease in Pco2 is more marked in this compartment. CLINICAL TRIAL REGISTRATION NCT03496311.
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Affiliation(s)
- Francesco Zadek
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
| | - Giorgio Giudici
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | | | - Maria T. Ambrosini
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Adriana di Modugno
- Central Laboratory, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Vittorio Scaravilli
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy,Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Alberto Zanella
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy,Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Roberto Fumagalli
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy,Department of Anesthesia and Intensive Care Medicine, Niguarda Ca’ Granda, Milan, Italy
| | - Nino Stocchetti
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy,Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Edoardo Calderini
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy
| | - Thomas Langer
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy,Department of Anesthesia and Intensive Care Medicine, Niguarda Ca’ Granda, Milan, Italy,Corresponding author.
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3
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Crosignani A, Spina S, Marrazzo F, Cimbanassi S, Malbrain MLNG, Van Regenemortel N, Fumagalli R, Langer T. Intravenous fluid therapy in patients with severe acute pancreatitis admitted to the intensive care unit: a narrative review. Ann Intensive Care 2022; 12:98. [PMID: 36251136 PMCID: PMC9576837 DOI: 10.1186/s13613-022-01072-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 10/11/2022] [Indexed: 11/26/2022] Open
Abstract
Patients with acute pancreatitis (AP) often require ICU admission, especially when signs of multiorgan failure are present, a condition that defines AP as severe. This disease is characterized by a massive pancreatic release of pro-inflammatory cytokines that causes a systemic inflammatory response syndrome and a profound intravascular fluid loss. This leads to a mixed hypovolemic and distributive shock and ultimately to multiorgan failure. Aggressive fluid resuscitation is traditionally considered the mainstay treatment of AP. In fact, all available guidelines underline the importance of fluid therapy, particularly in the first 24–48 h after disease onset. However, there is currently no consensus neither about the type, nor about the optimal fluid rate, total volume, or goal of fluid administration. In general, a starting fluid rate of 5–10 ml/kg/h of Ringer’s lactate solution for the first 24 h has been recommended. Fluid administration should be aggressive in the first hours, and continued only for the appropriate time frame, being usually discontinued, or significantly reduced after the first 24–48 h after admission. Close clinical and hemodynamic monitoring along with the definition of clear resuscitation goals are fundamental. Generally accepted targets are urinary output, reversal of tachycardia and hypotension, and improvement of laboratory markers. However, the usefulness of different endpoints to guide fluid therapy is highly debated. The importance of close monitoring of fluid infusion and balance is acknowledged by most available guidelines to avoid the deleterious effect of fluid overload. Fluid therapy should be carefully tailored in patients with severe AP, as for other conditions frequently managed in the ICU requiring large fluid amounts, such as septic shock and burn injury. A combination of both noninvasive clinical and invasive hemodynamic parameters, and laboratory markers should guide clinicians in the early phase of severe AP to meet organ perfusion requirements with the proper administration of fluids while avoiding fluid overload. In this narrative review the most recent evidence about fluid therapy in severe AP is discussed and an operative algorithm for fluid administration based on an individualized approach is proposed.
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Affiliation(s)
- Andrea Crosignani
- School of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.,Department of Anaesthesia and Critical Care, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Stefano Spina
- School of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.,Department of Anaesthesia and Critical Care, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Francesco Marrazzo
- School of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.,Department of Anaesthesia and Critical Care, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Stefania Cimbanassi
- General Surgery and Trauma Team, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy.,Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Manu L N G Malbrain
- First Department of Anaesthesia and Intensive Therapy, Medical University of Lublin, Lublin, Poland.,International Fluid Academy, Lovenjoel, Belgium
| | - Niels Van Regenemortel
- Department of Intensive Care Medicine, Antwerp University Hospital, Antwerp, Belgium.,Department of Intensive Care Medicine, Ziekenhuis Netwerk Antwerpen Campus Stuivenberg, Antwerp, Belgium
| | - Roberto Fumagalli
- School of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy.,Department of Anaesthesia and Critical Care, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Thomas Langer
- School of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy. .,Department of Anaesthesia and Critical Care, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy.
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4
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Langer T, Zadek F, Carbonara M, Caccioppola A, Brusatori S, Zoerle T, Bottazzini F, Ferraris Fusarini C, di Modugno A, Zanella A, Zanier ER, Fumagalli R, Pesenti A, Stocchetti N. Cerebrospinal Fluid and Arterial Acid-Base Equilibrium of Spontaneously Breathing Patients with Aneurismal Subarachnoid Hemorrhage. Neurocrit Care 2022; 37:102-110. [PMID: 35199305 PMCID: PMC9283163 DOI: 10.1007/s12028-022-01450-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/12/2022] [Indexed: 12/29/2022]
Abstract
BACKGROUND Hyperventilation resulting in hypocapnic alkalosis (HA) is frequently encountered in spontaneously breathing patients with acute cerebrovascular conditions. The underlying mechanisms of this respiratory response have not been fully elucidated. The present study describes, applying the physical-chemical approach, the acid-base characteristics of cerebrospinal fluid (CSF) and arterial plasma of spontaneously breathing patients with aneurismal subarachnoid hemorrhage (SAH) and compares these results with those of control patients. Moreover, it investigates the pathophysiologic mechanisms leading to HA in SAH. METHODS Patients with SAH admitted to the neurological intensive care unit and patients (American Society of Anesthesiologists physical status of 1 and 2) undergoing elective surgery under spinal anesthesia were enrolled. CSF and arterial samples were collected simultaneously. Electrolytes, strong ion difference (SID), partial pressure of carbon dioxide (PCO2), weak noncarbonic acids (ATOT), and pH were measured in CSF and arterial blood samples. RESULTS Twenty spontaneously breathing patients with SAH and 25 controls were enrolled. The CSF of patients with SAH, as compared with controls, was characterized by a lower SID (23.1 ± 2.3 vs. 26.5 ± 1.4 mmol/L, p < 0.001) and PCO2 (40 ± 4 vs. 46 ± 3 mm Hg, p < 0.001), whereas no differences in ATOT (1.2 ± 0.5 vs. 1.2 ± 0.2 mmol/L, p = 0.95) and pH (7.34 ± 0.06 vs. 7.35 ± 0.02, p = 0.69) were observed. The reduced CSF SID was mainly caused by a higher lactate concentration (3.3 ± 1.3 vs. 1.4 ± 0.2 mmol/L, p < 0.001). A linear association (r = 0.71, p < 0.001) was found between CSF SID and arterial PCO2. A higher proportion of patients with SAH were characterized by arterial HA, as compared with controls (40 vs. 4%, p = 0.003). A reduced CSF-to-plasma difference in PCO2 was observed in nonhyperventilating patients with SAH (0.4 ± 3.8 vs. 7.8 ± 3.7 mm Hg, p < 0.001). CONCLUSIONS Patients with SAH have a reduction of CSF SID due to an increased lactate concentration. The resulting localized acidifying effect is compensated by CSF hypocapnia, yielding normal CSF pH values and resulting in a higher incidence of arterial HA.
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Affiliation(s)
- Thomas Langer
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy.
- Department of Anesthesia and Intensive Care Medicine, Niguarda Ca' Granda, Milan, Italy.
| | - Francesco Zadek
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Marco Carbonara
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Alessio Caccioppola
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Serena Brusatori
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Tommaso Zoerle
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Francesco Bottazzini
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | | | - Adriana di Modugno
- Central Laboratory, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Alberto Zanella
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Elisa R Zanier
- Laboratory of Acute Brain Injury and Therapeutic Strategies, Department of Neuroscience, Istituto Di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Roberto Fumagalli
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
- Department of Anesthesia and Intensive Care Medicine, Niguarda Ca' Granda, Milan, Italy
| | - Antonio Pesenti
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Nino Stocchetti
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
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Langer T, Giani M. Acid-base effects of regional citrate anticoagulation for continuous renal replacement therapy: don't judge the technique only by its name, every bag is not the same! Minerva Anestesiol 2021; 87:1281-1283. [PMID: 34874133 DOI: 10.23736/s0375-9393.21.16207-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Thomas Langer
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Monza-Brianza, Italy - .,Department of Anesthesia and Intensive Care Medicine, Niguarda Ca' Granda Hospital, Milan, Italy -
| | - Marco Giani
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Monza-Brianza, Italy.,ASST Monza, San Gerardo Hospital, Monza, Monza-Brianza, Italy
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Gattarello S, Pasticci I, Busana M, Lazzari S, Palermo P, Palumbo MM, Romitti F, Steinberg I, Collino F, Vassalli F, Langer T, Moerer O, Saager L, Herrmann P, Cadringher P, Meissner K, Quintel M, Gattinoni L. Role of Fluid and Sodium Retention in Experimental Ventilator-Induced Lung Injury. Front Physiol 2021; 12:743153. [PMID: 34588999 PMCID: PMC8473803 DOI: 10.3389/fphys.2021.743153] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Accepted: 08/20/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Ventilator-induced lung injury (VILI) via respiratory mechanics is deeply interwoven with hemodynamic, kidney and fluid/electrolyte changes. We aimed to assess the role of positive fluid balance in the framework of ventilation-induced lung injury. Methods:Post-hoc analysis of seventy-eight pigs invasively ventilated for 48 h with mechanical power ranging from 18 to 137 J/min and divided into two groups: high vs. low pleural pressure (10.0 ± 2.8 vs. 4.4 ± 1.5 cmH2O; p < 0.01). Respiratory mechanics, hemodynamics, fluid, sodium and osmotic balances, were assessed at 0, 6, 12, 24, 48 h. Sodium distribution between intracellular, extracellular and non-osmotic sodium storage compartments was estimated assuming osmotic equilibrium. Lung weight, wet-to-dry ratios of lung, kidney, liver, bowel and muscle were measured at the end of the experiment. Results: High pleural pressure group had significant higher cardiac output (2.96 ± 0.92 vs. 3.41 ± 1.68 L/min; p < 0.01), use of norepinephrine/epinephrine (1.76 ± 3.31 vs. 5.79 ± 9.69 mcg/kg; p < 0.01) and total fluid infusions (3.06 ± 2.32 vs. 4.04 ± 3.04 L; p < 0.01). This hemodynamic status was associated with significantly increased sodium and fluid retention (at 48 h, respectively, 601.3 ± 334.7 vs. 1073.2 ± 525.9 mmol, p < 0.01; and 2.99 ± 2.54 vs. 6.66 ± 3.87 L, p < 0.01). Ten percent of the infused sodium was stored in an osmotically inactive compartment. Increasing fluid and sodium retention was positively associated with lung-weight (R2 = 0.43, p < 0.01; R2 = 0.48, p < 0.01) and with wet-to-dry ratio of the lungs (R2 = 0.14, p < 0.01; R2 = 0.18, p < 0.01) and kidneys (R2 = 0.11, p = 0.02; R2 = 0.12, p = 0.01). Conclusion: Increased mechanical power and pleural pressures dictated an increase in hemodynamic support resulting in proportionally increased sodium and fluid retention and pulmonary edema.
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Affiliation(s)
- Simone Gattarello
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Iacopo Pasticci
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Mattia Busana
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Stefano Lazzari
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Paola Palermo
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Maria Michela Palumbo
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Federica Romitti
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Irene Steinberg
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Francesca Collino
- Department of Anesthesia, Intensive Care and Emergency, "Città della Salute e della Scienza" Hospital, Turin, Italy
| | - Francesco Vassalli
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Thomas Langer
- Department of Medicine and Surgery, University of Milano-Bicocca, Milan, Italy.,Department of Anesthesia and Intensive Care Medicine, Niguarda Ca' Granda, Milan, Italy
| | - Onnen Moerer
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Leif Saager
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Peter Herrmann
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Paolo Cadringher
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Konrad Meissner
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
| | - Michael Quintel
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany.,Department of Anesthesiology, Intensive Care and Emergency Medicine Donau-Isar-Klinikum Deggendorf, Deggendorf, Germany
| | - Luciano Gattinoni
- Department of Anesthesiology, University Medical Centre Göttingen, Göttingen, Germany
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7
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Langer T, Brusatori S, Carlesso E, Zadek F, Brambilla P, Ferraris Fusarini C, Duska F, Caironi P, Gattinoni L, Fasano M, Lualdi M, Alberio T, Zanella A, Pesenti A, Grasselli G. Low noncarbonic buffer power amplifies acute respiratory acid-base disorders in patients with sepsis: an in vitro study. J Appl Physiol (1985) 2021; 131:464-473. [PMID: 34138647 DOI: 10.1152/japplphysiol.00787.2020] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Patients with sepsis have typically reduced concentrations of hemoglobin and albumin, the major components of noncarbonic buffer power (β). This could expose patients to high pH variations during acid-base disorders. The objective of this study is to compare, in vitro, noncarbonic β of patients with sepsis with that of healthy volunteers, and evaluate its distinct components. Whole blood and isolated plasma of 18 patients with sepsis and 18 controls were equilibrated with different CO2 mixtures. Blood gases, pH, and electrolytes were measured. Noncarbonic β and noncarbonic β due to variations in strong ion difference (βSID) were calculated for whole blood. Noncarbonic β and noncarbonic β normalized for albumin concentrations (βNORM) were calculated for isolated plasma. Representative values at pH = 7.40 were compared. Albumin proteoforms were evaluated via two-dimensional electrophoresis. Hemoglobin and albumin concentrations were significantly lower in patients with sepsis. Patients with sepsis had lower noncarbonic β both of whole blood (22.0 ± 1.9 vs. 31.6 ± 2.1 mmol/L, P < 0.01) and plasma (0.5 ± 1.0 vs. 3.7 ± 0.8 mmol/L, P < 0.01). Noncarbonic βSID was lower in patients (16.8 ± 1.9 vs. 24.4 ± 1.9 mmol/L, P < 0.01) and strongly correlated with hemoglobin concentration (r = 0.94, P < 0.01). Noncarbonic βNORM was lower in patients [0.01 (-0.01 to 0.04) vs. 0.08 (0.06-0.09) mmol/g, P < 0.01]. Patients with sepsis and controls showed different amounts of albumin proteoforms. Patients with sepsis are exposed to higher pH variations for any given change in CO2 due to lower concentrations of noncarbonic buffers and, possibly, an altered buffering function of albumin. In both patients with sepsis and healthy controls, electrolyte shifts are the major buffering mechanism during respiratory acid-base disorders.NEW & NOTEWORTHY Patients with sepsis are poorly protected against acute respiratory acid-base derangements due to a lower noncarbonic buffer power, which is caused both by a reduction in the major noncarbonic buffers, i.e. hemoglobin and albumin, and by a reduced buffering capacity of albumin. Electrolyte shifts from and to the red blood cells determining acute variations in strong ion difference are the major buffering mechanism during acute respiratory acid-base disorders.
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Affiliation(s)
- Thomas Langer
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy.,Department of Anesthesia and Intensive Care Medicine, Niguarda Ca' Granda, Milan, Italy
| | - Serena Brusatori
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Eleonora Carlesso
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Francesco Zadek
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Paolo Brambilla
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | | | - Frantisek Duska
- Department of Anaesthesia and Intensive Care Medicine, The Third Faculty of Medicine, Charles University and FNKV University Hospital, Prague, Czech Republic
| | - Pietro Caironi
- Department of Anesthesia and Critical Care, Azienda Ospedaliero-Universitaria S. Luigi Gonzaga, Orbassano, Italy.,Department of Oncology, University of Turin, Orbassano, Italy
| | - Luciano Gattinoni
- Department of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Mauro Fasano
- Department of Science and High Technology, University of Insubria, Busto Arsizio, Italy
| | - Marta Lualdi
- Department of Science and High Technology, University of Insubria, Busto Arsizio, Italy
| | - Tiziana Alberio
- Department of Science and High Technology, University of Insubria, Busto Arsizio, Italy
| | - Alberto Zanella
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy.,Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Antonio Pesenti
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy.,Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Giacomo Grasselli
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy.,Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
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8
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Increased ratio of P[v-a]CO 2 to C[a-v]O 2 without global hypoxia: the case of metformin-induced lactic acidosis. Respir Physiol Neurobiol 2020; 285:103586. [PMID: 33202296 DOI: 10.1016/j.resp.2020.103586] [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: 08/28/2020] [Revised: 10/18/2020] [Accepted: 11/11/2020] [Indexed: 12/24/2022]
Abstract
The ratio of venoarterial CO2 tension to arteriovenous O2 content difference (P[v-a]CO2/C[a-v]O2) increases when lactic acidosis is due to inadequate oxygen supply (hypoxia); we aimed to verify whether it also increases when lactic acidosis develops because of mitochondrial dysfunction (dysoxia) with constant oxygen delivery. Twelve anaesthetised, mechanically ventilated pigs were intoxicated with IV metformin (4.0 to 6.4 g over 2.5 to 4.0 h). Saline and norepinephrine were used to preserve oxygen delivery. Lactate and P[v-a]CO2/C[a-v]O2 were measured every one or two hours (arterial and mixed venous blood). During metformin intoxication, lactate increased from 0.8 (0.6-0.9) to 8.5 (5.0-10.9) mmol/l (p < 0.001), even if oxygen delivery remained constant (from 352 ± 78 to 343 ± 97 ml/min, p = 0.098). P[v-a]CO2/C[a-v]O2 increased from 1.6 (1.2-1.8) to 2.3 (1.9-3.2) mmHg/ml/dl (p = 0.004). The intraclass correlation coefficient between lactate and P[v-a]CO2/C[a-v]O2 was 0.72 (p < 0.001). We conclude that P[v-a]CO2/C[a-v]O2 increases when lactic acidosis is due to dysoxia. Therefore, a high P[v-a]CO2/C[a-v]O2 may not discriminate hypoxia from dysoxia as the cause of lactic acidosis.
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9
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Kilic O, Gultekin Y, Yazici S. The Impact of Intravenous Fluid Therapy on Acid-Base Status of Critically Ill Adults: A Stewart Approach-Based Perspective. Int J Nephrol Renovasc Dis 2020; 13:219-230. [PMID: 33061531 PMCID: PMC7534048 DOI: 10.2147/ijnrd.s266864] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 08/14/2020] [Indexed: 12/25/2022] Open
Abstract
One of the most important tasks of physicians working in intensive care units (ICUs) is to arrange intravenous fluid therapy. The primary indications of the need for intravenous fluid therapy in ICUs are in cases of resuscitation, maintenance, or replacement, but we also load intravenous fluid for purposes such as fluid creep (including drug dilution and keeping venous lines patent) as well as nutrition. However, in doing so, some facts are ignored or overlooked, resulting in an acid-base disturbance. Regardless of the type and content of the fluid entering the body through an intravenous route, it may impair the acid-base balance depending on the rate, volume, and duration of the administration. The mechanism involved in acid-base disturbances induced by intravenous fluid therapy is easier to understand with the help of the physical-chemical approach proposed by Canadian physiologist, Peter Stewart. It is possible to establish a quantitative link between fluid therapy and acid–base disturbance using the Stewart principles. However, it is not possible to accomplish this with the traditional approach; moreover, it may not be noticed sometimes due to the normalization of pH or standard base excess induced by compensatory mechanisms. The clinical significance of fluid-induced acid-base disturbances has not been completely clarified yet. Nevertheless, as fluid therapy may be the cause of unexplained acid-base disorders that may lead to confusion and elicit unnecessary investigation, more attention must be paid to understand this issue. Therefore, the aim of this paper is to address the effects of different types of fluid therapies on acid-base balance using the simplified perspective of Stewart principles. Overall, the paper intends to help recognize fluid-induced acid-base disturbance through bedside evaluation and choose an appropriate fluid by considering the acid-base status of a patient.
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Affiliation(s)
- Ozgur Kilic
- Siyami Ersek Thoracic and Cardiovascular Surgery Center, Cardiology Department, Cardiac Intensive Care Unit, Istanbul, Turkey
| | - Yucel Gultekin
- Mersin University Hospital, General Surgery Department, Mersin, Turkey
| | - Selcuk Yazici
- Siyami Ersek Thoracic and Cardiovascular Surgery Center, Cardiology Department, Cardiac Intensive Care Unit, Istanbul, Turkey
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10
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Langer T, D'Oria V, Spolidoro GCI, Chidini G, Scalia Catenacci S, Marchesi T, Guerrini M, Cislaghi A, Agostoni C, Pesenti A, Calderini E. Fluid therapy in mechanically ventilated critically ill children: the sodium, chloride and water burden of fluid creep. BMC Pediatr 2020; 20:424. [PMID: 32891127 PMCID: PMC7487923 DOI: 10.1186/s12887-020-02322-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 08/25/2020] [Indexed: 12/15/2022] Open
Abstract
Background Fluid therapy is a cornerstone of pediatric intensive care medicine. We aimed at quantifying the load of water, sodium and chloride due to different fluid indications in our pediatric intensive care unit (PICU). We were particularly interested in the role of fluid creep, i.e. fluid administered mainly as the vehicle for drugs, and the association between sodium load and water balance. Methods Critically ill children aged ≤3 years and invasively ventilated for ≥48 h between 2016 and 2019 in a single tertiary center PICU were retrospectively enrolled. Need for renal replacement therapy, plasmapheresis or parenteral nutrition constituted exclusion criteria. Quantity, quality and indication of fluids administered intravenously or enterally, urinary output and fluid balance were recorded for the first 48 h following intubation. Concentrations of sodium and chloride provided by the manufacturers were used to compute the electrolyte load. Results Forty-three patients (median 7 months (IQR 3–15)) were enrolled. Patients received 1004 ± 284 ml of water daily (153 ± 36 ml/kg/day), mainly due to enteral (39%), creep (34%) and maintenance (24%) fluids. Patients received 14.4 ± 4.8 mEq/kg/day of sodium and 13.6 ± 4.7 mEq/kg/day of chloride, respectively. The majority of sodium and chloride derived from fluid creep (56 and 58%). Daily fluid balance was 417 ± 221 ml (64 ± 30 ml/kg/day) and was associated with total sodium intake (r2 = 0.49, p < 0.001). Conclusions Critically ill children are exposed, especially in the acute phase, to extremely high loads of water, sodium and chloride, possibly contributing to edema development. Fluid creep is quantitatively the most relevant fluid in the PICU and future research efforts should address this topic in order to reduce the inadvertent water and electrolyte burden and improve the quality of care of critically ill children.
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Affiliation(s)
- Thomas Langer
- Department of Medicine and Surgery, University of Milan-Bicocca, Milan, Italy. .,Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Anestesia e Terapia Intensiva Donna-Bambino, Milan, Italy. .,Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy.
| | - Veronica D'Oria
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Anestesia e Terapia Intensiva Donna-Bambino, Milan, Italy
| | - Giulia C I Spolidoro
- Department of Clinical Sciences and Community Health, University of Milan, 20122, Milan, Italy
| | - Giovanna Chidini
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Anestesia e Terapia Intensiva Donna-Bambino, Milan, Italy
| | - Stefano Scalia Catenacci
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Anestesia e Terapia Intensiva Donna-Bambino, Milan, Italy
| | - Tiziana Marchesi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Anestesia e Terapia Intensiva Donna-Bambino, Milan, Italy
| | - Marta Guerrini
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Anestesia e Terapia Intensiva Donna-Bambino, Milan, Italy
| | - Andrea Cislaghi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Anestesia e Terapia Intensiva Donna-Bambino, Milan, Italy
| | - Carlo Agostoni
- Department of Clinical Sciences and Community Health, University of Milan, 20122, Milan, Italy.,Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Pediatric Intermediate Care Unit, 20122, Milan, Italy
| | - Antonio Pesenti
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy.,Department of Anesthesia, Critical Care and Emergency, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Edoardo Calderini
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Anestesia e Terapia Intensiva Donna-Bambino, Milan, Italy
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11
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Malbrain MLNG, Langer T, Annane D, Gattinoni L, Elbers P, Hahn RG, De Laet I, Minini A, Wong A, Ince C, Muckart D, Mythen M, Caironi P, Van Regenmortel N. Intravenous fluid therapy in the perioperative and critical care setting: Executive summary of the International Fluid Academy (IFA). Ann Intensive Care 2020; 10:64. [PMID: 32449147 PMCID: PMC7245999 DOI: 10.1186/s13613-020-00679-3] [Citation(s) in RCA: 108] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 05/14/2020] [Indexed: 02/07/2023] Open
Abstract
Intravenous fluid administration should be considered as any other pharmacological prescription. There are three main indications: resuscitation, replacement, and maintenance. Moreover, the impact of fluid administration as drug diluent or to preserve catheter patency, i.e., fluid creep, should also be considered. As for antibiotics, intravenous fluid administration should follow the four Ds: drug, dosing, duration, de-escalation. Among crystalloids, balanced solutions limit acid–base alterations and chloride load and should be preferred, as this likely prevents renal dysfunction. Among colloids, albumin, the only available natural colloid, may have beneficial effects. The last decade has seen growing interest in the potential harms related to fluid overloading. In the perioperative setting, appropriate fluid management that maintains adequate organ perfusion while limiting fluid administration should represent the standard of care. Protocols including a restrictive continuous fluid administration alongside bolus administration to achieve hemodynamic targets have been proposed. A similar approach should be considered also for critically ill patients, in whom increased endothelial permeability makes this strategy more relevant. Active de-escalation protocols may be necessary in a later phase. The R.O.S.E. conceptual model (Resuscitation, Optimization, Stabilization, Evacuation) summarizes accurately a dynamic approach to fluid therapy, maximizing benefits and minimizing harms. Even in specific categories of critically ill patients, i.e., with trauma or burns, fluid therapy should be carefully applied, considering the importance of their specific aims; maintaining peripheral oxygen delivery, while avoiding the consequences of fluid overload.
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Affiliation(s)
- Manu L N G Malbrain
- Department of Intensive Care Medicine, University Hospital Brussels (UZB), Laarbeeklaan 101, 1090, Jette, Belgium. .,Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, Jette, 1090, Belgium. .,International Fluid Academy, Lovenjoel, Belgium.
| | - Thomas Langer
- School of Medicine and Surgery, Milano-Bicocca University, Milan, Italy.,Department of Anesthesia and Critical Care, ASST Grande Ospedale Metropolitano Niguarda, Milan, Italy
| | - Djillali Annane
- General Intensive Care Unit, Raymond Poincaré Hospital (GHU APHP Université Paris Saclay), U1173 Inflammation & Infection, School of Medicine Simone Veil, UVSQ-University Paris Saclay, 104 Boulevard Raymond Poincaré, 92380, Garches, France
| | - Luciano Gattinoni
- Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Paul Elbers
- Department of Intensive Care Medicine, Amsterdam UMC, Location VUmc, Amsterdam, The Netherlands
| | - Robert G Hahn
- Karolinska Institutet at Danderyds Hospital (KIDS), Stockholm, Sweden
| | - Inneke De Laet
- Department of Intensive Care Medicine, Ziekenhuis Netwerk Antwerpen, ZNA Stuivenberg, Antwerp, Belgium
| | - Andrea Minini
- Department of Intensive Care Medicine, University Hospital Brussels (UZB), Laarbeeklaan 101, 1090, Jette, Belgium
| | - Adrian Wong
- Department of Intensive Care Medicine and Anaesthesia, King's College Hospital, Denmark Hill, London, UK
| | - Can Ince
- Department of Intensive Care Medicine, Laboratory of Translational Intensive Care Medicine, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - David Muckart
- Department of Surgery, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa.,Level I Trauma Unit and Trauma Intensive Care Unit, Inkosi Albert Luthuli Central Hospital, Durban, South Africa
| | - Monty Mythen
- University College London Hospitals, National Institute of Health Research Biomedical Research Centre, London, UK
| | - Pietro Caironi
- SCDU Anestesia e Rianimazione, Azienda Ospedaliero-Universitaria S. Luigi Gonzaga, Orbassano, Italy.,Dipartimento di Oncologia, Università degli Studi di Torino, Turin, Italy
| | - Niels Van Regenmortel
- Department of Intensive Care Medicine, Ziekenhuis Netwerk Antwerpen, ZNA Stuivenberg, Antwerp, Belgium.,Department of Intensive Care Medicine, Ziekenhuis Netwerk Antwerpen, ZNA Stuivenberg, Antwerp, Belgium
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12
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Zanella A, Caironi P, Castagna L, Rezoagli E, Salerno D, Scotti E, Scaravilli V, Deab SA, Langer T, Mauri T, Ferrari M, Dondossola D, Chiodi M, Zadek F, Magni F, Gatti S, Gattinoni L, Pesenti AM. Extracorporeal Chloride Removal by Electrodialysis. A Novel Approach to Correct Acidemia. Am J Respir Crit Care Med 2020; 201:799-813. [DOI: 10.1164/rccm.201903-0538oc] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Alberto Zanella
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care, and Emergency
| | - Pietro Caironi
- Department of Anesthesia and Critical Care, Azienda Ospedaliero-Universitaria S. Luigi Gonzaga, Orbassano, Italy; Department of Oncology, University of Turin, Orbassano, Italy
| | | | - Emanuele Rezoagli
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
- Regenerative Medicine Institute at CÚRAM Centre for Research in Medical Devices, and Discipline of Anaesthesia, School of Medicine, National University of Ireland Galway, Galway, Ireland
- Department of Anaesthesia and Intensive Care Medicine, Galway University Hospitals, SAOLTA University Health Group, Galway, Ireland
| | - Domenico Salerno
- Department of Medicine and Surgery, University of Milan-Bicocca, Monza, Italy
| | - Eleonora Scotti
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
| | | | | | - Thomas Langer
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care, and Emergency
| | - Tommaso Mauri
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care, and Emergency
| | - Michele Ferrari
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
| | - Daniele Dondossola
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
- General and Liver Transplant Surgery Unit, and
| | - Manuela Chiodi
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
| | - Francesco Zadek
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
| | - Federico Magni
- Department of Emergency and Intensive Care, San Gerardo Hospital, Monza, Italy; and
| | - Stefano Gatti
- Center for Preclinical Research, Fondazione IRCCS Ca’ Granda-Ospedale Maggiore Policlinico, Milan, Italy
| | - Luciano Gattinoni
- Department of Anesthesiology, Emergency and Intensive Care Medicine, University of Göttingen, Göttingen, Germany
| | - Antonio M. Pesenti
- Department of Medical Physiopathology and Transplants, University of Milan, Milan, Italy
- Department of Anesthesia, Critical Care, and Emergency
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13
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Pfortmueller CA, Kabon B, Schefold JC, Fleischmann E. Crystalloid fluid choice in the critically ill : Current knowledge and critical appraisal. Wien Klin Wochenschr 2018; 130:273-282. [PMID: 29500723 DOI: 10.1007/s00508-018-1327-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 02/11/2018] [Indexed: 12/24/2022]
Abstract
Intravenous infusion of crystalloid solutions is one of the most frequently administered medications worldwide. Available crystalloid infusion solutions have a variety of compositions and have a major impact on body systems; however, administration of crystalloid fluids currently follows a "one fluid for all" approach than a patient-centered fluid prescription. Normal saline is associated with hyperchloremic metabolic acidosis, increased rates of acute kidney injury, increased hemodynamic instability and potentially mortality. Regarding balanced infusates, evidence remains less clear since most studies compared normal saline to buffered infusion solutes.; however, buffered solutes are not homogeneous. The term "buffered solutes" only refers to the concept of acid-buffering in infusion fluids but this does not necessarily imply that the solutes have similar physiological impacts. The currently available data indicate that balanced infusates might have some advantages; however, evidence still is inconclusive. Taking the available evidence together, there is no single fluid that is superior for all patients and settings, because all currently available infusates have distinct differences, advantages and disadvantages; therefore, it seems inevitable to abandon the "one fluid for all" strategy towards a more differentiated and patient-centered approach to fluid therapy in the critically ill.
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Affiliation(s)
- Carmen A Pfortmueller
- Clinic for General Anesthesiology, Intensive Care and Pain Management, Medical University of Vienna, Vienna, Austria. .,Department of Intensive Care, Inselspital, Bern University Hospital, Bern, Switzerland.
| | - Barbara Kabon
- Clinic for General Anesthesiology, Intensive Care and Pain Management, Medical University of Vienna, Vienna, Austria
| | - Joerg C Schefold
- Department of Intensive Care, Inselspital, Bern University Hospital, Bern, Switzerland
| | - Edith Fleischmann
- Clinic for General Anesthesiology, Intensive Care and Pain Management, Medical University of Vienna, Vienna, Austria
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14
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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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15
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Muir W. Effect of Intravenously Administered Crystalloid Solutions on Acid-Base Balance in Domestic Animals. J Vet Intern Med 2017; 31:1371-1381. [PMID: 28833697 PMCID: PMC5598900 DOI: 10.1111/jvim.14803] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 06/30/2017] [Accepted: 07/13/2017] [Indexed: 12/28/2022] Open
Abstract
Intravenous fluid therapy can alter plasma acid-base balance. The Stewart approach to acid-base balance is uniquely suited to identify and quantify the effects of the cationic and anionic constituents of crystalloid solutions on plasma pH. The plasma strong ion difference (SID) and weak acid concentrations are similar to those of the administered fluid, more so at higher administration rates and with larger volumes. A crystalloid's in vivo effects on plasma pH are described by 3 general rules: SID > [HCO3-] increases plasma pH (alkalosis); SID < [HCO3-] decreases plasma pH (alkalosis); and SID = [HCO3-] yields no change in plasma pH. The in vitro pH of commercially prepared crystalloid solutions has little to no effect on plasma pH because of their low titratable acidity. Appreciation of IV fluid composition and an understanding of basic physicochemical principles provide therapeutically valuable insights about how and why fluid therapy can produce and correct alterations of plasma acid-base equilibrium. The ideal balanced crystalloid should (1) contain species-specific concentrations of key electrolytes (Na+ , Cl- , K+ , Ca++ , Mg++ ), particularly Na+ and Cl- ; (2) maintain or normalize acid-base balance (provide an appropriate SID); and (3) be isosmotic and isotonic (not induce inappropriate fluid shifts) with normal plasma.
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Affiliation(s)
- W. Muir
- College of Veterinary MedicineLincoln Memorial UniversityHarrogateTN
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17
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Kimmoun A, Novy E, Auchet T, Ducrocq N, Levy B. Hemodynamic consequences of severe lactic acidosis in shock states: from bench to bedside. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2015; 19:175. [PMID: 25887061 PMCID: PMC4391479 DOI: 10.1186/s13054-015-0896-7] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Lactic acidosis is a very common biological issue for shock patients. Experimental data clearly demonstrate that metabolic acidosis, including lactic acidosis, participates in the reduction of cardiac contractility and in the vascular hyporesponsiveness to vasopressors through various mechanisms. However, the contributions of each mechanism responsible for these deleterious effects have not been fully determined and their respective consequences on organ failure are still poorly defined, particularly in humans. Despite some convincing experimental data, no clinical trial has established the level at which pH becomes deleterious for hemodynamics. Consequently, the essential treatment for lactic acidosis in shock patients is to correct the cause. It is unknown, however, whether symptomatic pH correction is beneficial in shock patients. The latest Surviving Sepsis Campaign guidelines recommend against the use of buffer therapy with pH ≥7.15 and issue no recommendation for pH levels <7.15. Furthermore, based on strong experimental and clinical evidence, sodium bicarbonate infusion alone is not recommended for restoring pH. Indeed, bicarbonate induces carbon dioxide generation and hypocalcemia, both cardiovascular depressant factors. This review addresses the principal hemodynamic consequences of shock-associated lactic acidosis. Despite the lack of formal evidence, this review also highlights the various adapted supportive therapy options that could be putatively added to causal treatment in attempting to reverse the hemodynamic consequences of shock-associated lactic acidosis.
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Affiliation(s)
- Antoine Kimmoun
- CHU Nancy, Service de Réanimation Médicale Brabois, Pole Cardiovasculaire et Réanimation Médicale, Hôpital de Brabois, Vandoeuvre-les-Nancy, 54511, France. .,Université de Lorraine, Nancy, 54000, France. .,INSERM U1116, Groupe Choc, Faculté de Médecine, Vandoeuvre-les-Nancy, 54511, France.
| | - Emmanuel Novy
- CHU Nancy, Service de Réanimation Médicale Brabois, Pole Cardiovasculaire et Réanimation Médicale, Hôpital de Brabois, Vandoeuvre-les-Nancy, 54511, France. .,Université de Lorraine, Nancy, 54000, France.
| | - Thomas Auchet
- CHU Nancy, Service de Réanimation Médicale Brabois, Pole Cardiovasculaire et Réanimation Médicale, Hôpital de Brabois, Vandoeuvre-les-Nancy, 54511, France.
| | - Nicolas Ducrocq
- CHU Nancy, Service de Réanimation Médicale Brabois, Pole Cardiovasculaire et Réanimation Médicale, Hôpital de Brabois, Vandoeuvre-les-Nancy, 54511, France.
| | - Bruno Levy
- CHU Nancy, Service de Réanimation Médicale Brabois, Pole Cardiovasculaire et Réanimation Médicale, Hôpital de Brabois, Vandoeuvre-les-Nancy, 54511, France. .,Université de Lorraine, Nancy, 54000, France. .,INSERM U1116, Groupe Choc, Faculté de Médecine, Vandoeuvre-les-Nancy, 54511, France.
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18
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Scotti E, Ferrari M, Chiodi M, Zadek F, Belloni I, Zazzeron L, Langer T, Gattinoni L, Caironi P. Acid-base effects of different crystalloid solutions for ECMO priming: preliminary report. Crit Care 2015. [PMCID: PMC4472918 DOI: 10.1186/cc14436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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19
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Langer T, Scotti E, Carlesso E, Protti A, Zani L, Chierichetti M, Caironi P, Gattinoni L. Electrolyte shifts across the artificial lung in patients on extracorporeal membrane oxygenation: interdependence between partial pressure of carbon dioxide and strong ion difference. J Crit Care 2014; 30:2-6. [PMID: 25307980 DOI: 10.1016/j.jcrc.2014.09.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 08/19/2014] [Accepted: 09/15/2014] [Indexed: 12/13/2022]
Abstract
PURPOSE Partial pressure of carbon dioxide (PCO2), strong ion difference (SID), and total amount of weak acids independently regulate pH. When blood passes through an extracorporeal membrane lung, PCO2 decreases. Furthermore, changes in electrolytes, potentially affecting SID, were reported. We analyzed these phenomena according to Stewart's approach. METHODS Couples of measurements of blood entering (venous) and leaving (arterial) the extracorporeal membrane lung were analyzed in 20 patients. Changes in SID, PCO2, and pH were computed and pH variations in the absence of measured SID variations calculated. RESULTS Passing from venous to arterial blood, PCO2 was reduced (46.5 ± 7.7 vs 34.8 ± 7.4 mm Hg, P < .001), and hemoglobin saturation increased (78 ± 8 vs 100% ± 2%, P < .001). Chloride increased, and sodium decreased causing a reduction in SID (38.7 ± 5.0 vs 36.4 ± 5.1 mEq/L, P < .001). Analysis of quartiles of ∆PCO2 revealed progressive increases in chloride (P < .001), reductions in sodium (P < .001), and decreases in SID (P < .001), at constant hemoglobin saturation variation (P = .12). Actual pH variation was lower than pH variations in the absence of measured SID variations (0.09 ± 0.03 vs 0.12 ± 0.04, P < .001). CONCLUSIONS When PCO2 is reduced and oxygen added, several changes in electrolytes occur. These changes cause a PCO2-dependent SID reduction that, by acidifying plasma, limits pH correction caused by carbon dioxide removal. In this particular setting, PCO2 and SID are interdependent.
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Affiliation(s)
- Thomas Langer
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy; Dipartimento di Anestesia, Rianimazione ed Emergenza Urgenza, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milano, Italy.
| | - Eleonora Scotti
- Dipartimento di Anestesia, Rianimazione ed Emergenza Urgenza, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milano, Italy
| | - Eleonora Carlesso
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - Alessandro Protti
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy; Dipartimento di Anestesia, Rianimazione ed Emergenza Urgenza, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milano, Italy
| | - Loredana Zani
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - Monica Chierichetti
- Dipartimento di Anestesia, Rianimazione ed Emergenza Urgenza, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milano, Italy
| | - Pietro Caironi
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy; Dipartimento di Anestesia, Rianimazione ed Emergenza Urgenza, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milano, Italy
| | - Luciano Gattinoni
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy; Dipartimento di Anestesia, Rianimazione ed Emergenza Urgenza, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milano, Italy
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Roger C, Muller L, Deras P, Louart G, Nouvellon E, Molinari N, Goret L, Gris J, Ripart J, de La Coussaye J, Lefrant J. Does the type of fluid affect rapidity of shock reversal in an anaesthetized-piglet model of near-fatal controlled haemorrhage? A randomized study. Br J Anaesth 2014; 112:1015-23. [DOI: 10.1093/bja/aet375] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Abstract
PURPOSE OF REVIEW This review explores the contemporary definition of the term 'balanced crystalloid' and outlines optimal design features and their underlying rationale. RECENT FINDINGS Crystalloid interstitial expansion is unavoidable, but also occurs with colloids when there is endothelial glycocalyx dysfunction. Reduced chloride exposure may lessen kidney dysfunction and injury with a possible mortality benefit. Exact balance from an acid-base perspective is achieved with a crystalloid strong ion difference of 24 mEq/l. This can be done simply by replacing 24 mEq/l of chloride in 0.9% sodium chloride with bicarbonate or organic anion bicarbonate substitutes. Potassium, calcium and magnesium additives are probably unnecessary. Large volumes of mildly hypotonic crystalloids such as lactated Ringer's solution reduce extracellular tonicity in volunteers and increase intracranial pressure in nonbrain-injured experimental animals. A total cation concentration of 154 mmol/l with accompanying anions provides isotonicity. Of the commercial crystalloids, Ringer's acetate solution is close to balanced from both acid-base and tonicity perspectives, and there is little current evidence of acetate toxicity in the context of volume loading, in contrast to renal replacement. SUMMARY The case for balanced crystalloids is growing but unproven. A large randomized controlled trial of balanced crystalloids versus 0.9% sodium chloride is the next step.
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Ottolina D, Ferrari M, Zazzeron L, Scotti E, Stanziano M, Rovati C, Marenghi C, Gattinoni L, Caironi P. Strong ion difference and arterial bicarbonate concentration as cornerstones of the impact of fluid therapy on acid-base balance. Crit Care 2013. [PMCID: PMC3642670 DOI: 10.1186/cc12316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Myburgh J, Finfer S. Causes of death after fluid bolus resuscitation: new insights from FEAST. BMC Med 2013; 11:67. [PMID: 23497460 PMCID: PMC3599713 DOI: 10.1186/1741-7015-11-67] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 03/14/2013] [Indexed: 12/26/2022] Open
Abstract
The Fluid Expansion as Supportive Therapy (FEAST study) was an extremely well conducted study that gave unexpected results. The investigators had reported that febrile children with impaired perfusion treated in low-income countries without access to intensive care are more likely to die if they receive bolus resuscitation with albumin or saline compared with no bolus resuscitation at all. In a secondary analysis of the trial, published in BMC Medicine, the authors found that increased mortality was evident in patients who presented with clinical features of severe shock in isolation or in conjunction with features of respiratory or neurological failure. The cause of excess deaths was primarily refractory shock and not fluid overload. These features are consistent with a potential cardiotoxic or ischemia-reperfusion injury following resuscitation with boluses of intravenous fluid. Although these effects may have been amplified by the absence of invasive monitoring, mechanical ventilation or vasopressors, the results provide compelling insights into the effects of intravenous fluid resuscitation and potential adverse effects that extend beyond the initial resuscitation period. These data add to the increasing body of literature about the safety and efficacy of intravenous resuscitation fluids, which may be applicable to management of other populations of critically ill patients.
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Affiliation(s)
- John Myburgh
- St George Clinical School, University of New South Wales, The George Institute for Global Health, L13, 321 Kent Street, Sydney 2000, Australia
| | - Simon Finfer
- Royal North Shore Hospital, University of Sydney, The George Institute for Global Health, L13, 321 Kent Street, Sydney 2000, Australia
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Supporting hemodynamics: what should we target? What treatments should we use? CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2013; 17 Suppl 1:S4. [PMID: 23514343 PMCID: PMC3603477 DOI: 10.1186/cc11502] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Assessment and monitoring of hemodynamics is a cornerstone in critically ill patients as hemodynamic alteration may become life-threatening in a few minutes. Defining normal values in critically ill patients is not easy, because 'normality' is usually referred to healthy subjects at rest. Defining 'adequate' hemodynamics is easier, which embeds whatever pressure and flow set is sufficient to maintain the aerobic metabolism. We will refer to the unifying hypothesis proposed by Schrier several years ago. Accordingly, the alteration of three independent variables - heart (contractility and rate), vascular tone and intravascular volume - may lead to underfilling of the arterial tree, associated with reduced (as during myocardial infarction or hemorrhage) or expanded (sepsis or cirrhosis) plasma volume. The underfilling is sensed by the arterial baroreceptors, which activate primarily the sympathetic nervous system and renin-angiotensin-aldosterone system, as well as vasopressin, to restore the arterial filling by increasing the vascular tone and retaining sodium and water. Under 'normal' conditions, therefore, the homeostatic system is not activated and water/sodium excretion, heart rate and oxygen extraction are in the range found in normal subjects. When arterial underfilling occurs, the mechanisms are activated (sodium and water retention) - associated with low central venous oxygen saturation (ScvO2) if underfilling is caused by low flow/hypovolemia, or with normal/high ScvO2 if associated with high flow/hypervolemia. Although the correction of hemodynamics should be towards the correction of the independent determinants, the usual therapy performed is volume infusion. An accepted target is ScvO2 >70%, although this ignores the arterial underfilling associated with volume expansion/high flow. For large-volume resuscitation the worst solution is normal saline solution (chloride load, strong ion difference = 0, acidosis). To avoid changes in acid-base equilibrium the strong ion difference of the infused solution should be equal to the baseline bicarbonate concentration.
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Year in review in Intensive Care Medicine 2012: I. Neurology and neurointensive care, epidemiology and nephrology, biomarkers and inflammation, nutrition, experimentals. Intensive Care Med 2012; 39:232-46. [PMID: 23248038 PMCID: PMC3569582 DOI: 10.1007/s00134-012-2774-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 11/29/2012] [Indexed: 01/06/2023]
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