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PubMed1996

Osmolality and electrolytes in cerebrospinal fluid and serum of febrile children with and without seizures.

UNLABELLED: During acute febrile diseases mild disturbances of water and electrolyte balance occur frequently. It has been suggested that changes in electrolyte balance, in particular hyponatraemia, might predispose a child to convulsions during febrile illness; however, the changes of electrolytes in the CSF are not known. We have studied the effects of fever and convulsions on water and electrolyte balance in CSF and serum by measuring osmolality and electrolyte concentrations in children. The febrile population consisted of 60 children, 36 of whom had seizures during fever. Twenty-one children without convulsions and nine children with epileptic symptoms were nonfebrile controls. We noticed that CSF is subject to changes in osmolality and electrolyte concentration during fever, while convulsions do not exhibit such changes. CSF osmolality and sodium concentrations were lower in febrile children than in nonfebrile controls. The osmolality in febrile children with convulsions was 3.8% (P < 0.01) and without seizures 3.5% (P < 0.01) lower than in nonfebrile nonconvulsive children. The changes in CSF sodium concentration, and to a lesser extent potassium and chloride concentrations, paralleled those of CSF osmolality. A positive correlation was observed between the CSF and serum osmolatities (r = 0.73, P < 0.0001), and sodium concentrations (r = 0.63, P < 0.0001). A negative correlation between the body temperature and both CSF osmolality (r = -0.66, P < 0.0001) and sodium concentration (r = -0.59, P < 0.0001) exhibits also the important regulative role of increased body temperature. CONCLUSION: Fever is an important factor for disturbances in fluid and electrolyte balance. The alterations in CSF osmolality and sodium concentration do not, however, give an unambiguous explanation for the susceptibility to simple febrile seizures.

Child↗
PubMed1990

Electrolytes: clinical applications.

Many factors can influence electrolytes in the horse. With the major electrolytes (sodium and potassium), alterations in serum or plasma values do not reflect changes in total body status. However, estimates of electrolyte alterations may be made by combining assessments of body weight changes with plasma sodium values by using the formula of Edelman et al. In planning electrolyte therapy, it has to be remembered that access to green feed or hay is important in correcting any total body potassium depletion and that diets marginal in sodium may interfere with exercise capacity by limiting sweat production. Free access to salt would seem to be the simplest method to ensure adequate sodium availability. Despite the widespread use of various commercial electrolyte supplements administered in horses' feed, most would appear to be unwarranted. Extensive electrolyte deficits are most likely in endurance horses in which substantial electrolyte losses can occur in the sweat. In such cases and when access to grass or hay is limited, supplementation with sodium and potassium chloride may be useful. Bicarbonate administration appears to have no clinical role in endurance or pleasure horses. However, its use as a buffer to limit the extent of lactic acidosis during galloping exercise has not been resolved.

Animals↗
PubMed1988

Duration of delirium shortened by the correction of electrolyte imbalance.

Among 53 delirious patients with an electrolyte imbalance in the serum, the duration of delirium in 18 cases was significantly shortened by the correction of electrolyte imbalance, compared with that of 35 cases of delirium without an electrolyte correction. The mean duration of delirium (mean value +/- SE) corrected by electrolyte was 9.4 +/- 1.9 days, whereas the mean duration of delirium without the electrolyte correction was 25.7 +/- 4.6 days. The mean duration of delirium in 13 cases without the electrolyte imbalance was 25.0 +/- 6.6 days. From these results, the electrolyte correction should be done systematically for the delirious patients as a treatment for the disorder.

Adult↗
PubMed1983

Separation of cholera enterotoxin-induced mucus secretion from electrolyte secretion in rabbit ileum by acetazolamide, colchicine, cycloheximide, cytochalasin B and indomethacin.

In vivo rabbit ileal loops were prepared and inoculated with purified cholera enterotoxin (CT). After a lag period of about 1 h there was persistent stimulation of water and electrolyte secretion and a transient stimulation of mucus secretion into the luminal fluid. Repeated intraluminal inoculation of prostaglandin E1 (PGE1) caused a pattern of water, electrolyte and mucus secretion which was qualitatively the same as that following CT, except that no lag period was observed. Doses of the protein synthesis inhibitor, cycloheximide, the microtubule disrupter, colchicine, and the microfilament disrupter, cytochalasin B, were found that inhibited CT-induced mucus secretion but not water and electrolyte secretion. The carbonic anhydrase inhibitor, acetazolamide, inhibited CT-induced water and electrolyte secretion without inhibiting the mucus secreted over a 5-hour test period. Thus a variety of agents can be used to demonstrate a separation of intestinal water and electrolyte secretion from mucus secretion. The prostaglandin synthesis inhibitor, indomethacin, also inhibited CT-induced water, electrolyte and mucus secretion, but no dose of this agent was found that completely separated the water and electrolyte from the mucus secretion.

Acetazolamide↗
PubMedDate not supplied

[A methodological approach to determining electrolyte disorders in cholera patients].

A total of 198 cholera patients were studied for blood concentrations of electrolytes; the above patients were treated at Mykolaïv Cholera Hospital during an outbreak in 1995. It is advisable that blood plasma concentration of electrolytes be represented as mmol/kg of the mass of a cholera patient's body instead of mmol/l, to indicate disturbances in electrolytic balance. It is a matter of principle for the assessment of the patient's state to be done, first of all, before initiating the rehydration therapy treatments. Determinants of electrolytes in cholera patients got decreased not only in severe course of the illness but also in moderately severe one. Of all the electrolytes studied in blood plasma, it is in K+ and Cl- that deviations from the norm were at their greatest. Since electrolytic balance is a sensitive indicator of homeostasis of human organism it is useful to calculate the volume of salt solutions for the primary rehydration according to blood plasma concentration of Cl- in mmol/kg of mass of the patient's body. Lowering of electrolyte concentration in erythrocytes occurred only in severe course of cholera involving K+ only.

Acute Disease↗
PubMed1999

Acid-base and electrolyte abnormalities in patients with acute leukemia.

Disturbances of acid-base balance and electrolyte abnormalities are commonly seen in patients with acute leukemia. Our study aimed at illuminating the probable pathogenetic mechanisms responsible for these disturbances in patients with acute leukemia admitted to our hospital. We studied 66 patients (24 men and 44 women) aged between 17 and 87 years old on their admission and prior to any therapeutic intervention. Patients with diabetes mellitus, acute or chronic renal failure, hepatic failure, patients receiving drugs that influence acid-base status and electrolyte parameters during the last month, such as corticosteroids, cisplatin, diuretics, antacids, aminoglycosides, amphotericin, penicillin, and K(+), PO(4)(3-), or Mg(2+) supplements were excluded. Forty-one patients had at least one acid-base or electrolyte disturbance. There were no significant differences in the incidence of acid-base balance and electrolyte abnormalities between patients with acute myeloid leukemia (AML) and patients with acute lymphoblastic leukemia (ALL). The most frequent electrolyte abnormality was hypokalemia, observed in 41 patients (63%), namely in 34 patients with AML, and 7 with ALL; the main underlying pathophysiologic mechanism was inappropriate kaliuresis. Furthermore, hypokalemic patients more frequently experienced concurrent electrolyte disturbances (i.e., hyponatremia, hypocalcemia, hypophosphatemia, and hypomagnesemia), as well as various acid-base abnormalities compared to normokalemic patients. Hypokalemia in patients with acute leukemia may serve as an indicator of multiple concurrent, interrelated electrolyte disturbances, especially in patients with AML.

Acid-Base Imbalance↗
PubMed2001

Directed control of electroosmotic flow in nonaqueous electrolytes using poly(ethylene glycol) coated capillaries.

Poly(ethylene glycol) (PEG)-coated capillaries exhibit unique properties in nonaqueous electrolytes. Immobilized PEG interacts significantly with different cations present in nonaqueous electrolytes. This can induce a positive surface charge on PEG-coated capillaries and results in an adjustable anodic electroosmotic flow (EOF) in nonaqueous electrolytes whereas a reduced cathodic EOF is observed in aqueous electrolytes. The EOF can reversibly be adjusted by the variation of the electrolyte constitution, namely the type of the solvent used and the nature and concentration of background cations. In methanol and especially in acetonitrile electrolytes the magnitude and also the direction of EOF is strongly dependent on the water content. Using different alkali metal cations, the EOF can be increased, reduced, or even reversed depending on the nature of the cation. The directed manipulation of EOF in methanolic electrolytes using PEG-coated capillaries was applied for optimization of nonaqueous capillary electrophoretic separations of acidic compounds with regard to reproducibility, resolution, and analysis time.

Acetonitriles↗
PubMed2006

Effect of the electrolyte concentration on cation binding in aqueous surfactant solutions.

Electrospray ionisation mass spectrometry (ESI-MS) is used for the qualitative and quantitative study of ion binding to interfaces. The ESI-MS measurements are carried out in aqueous solutions of sodium dodecyl sulphate (SDS) in the presence of NaCl, NH(4)ClO(4) , KCl, or Mg(ClO(4))(2) . The effect of the electrolyte concentration on the fractions, y(cation(+) ), of the DS(-) monomers bound to the cations is shown. Moreover, the binding stability of different cations with DS(-) monomers is determined versus the electrolyte concentration. This stability and the y(Na(+) ) values (the Na(+) ions derived from SDS), estimated in the presence of a given electrolyte, are quantitatively correlated with the electrolyte cation effect on the water structure. We also present calibration curves from which the molar concentrations of the sodium ions (derived from SDS) and of the other cations (derived from the electrolyte), bound to the SDS-micelle surface at a given electrolyte concentration, can be obtained. Besides, specific ion effects (Hofmeister effects) are considered for 1:1 electrolytes.

Calibration↗
PubMed2004

Acceleration of carbon-13 spin-lattice relaxation times in amino acids by electrolytes.

Measurements of the enhancement, by various electrolytes, of the spin-lattice relaxation time of carbon-13 at different locations in a number of amino acids are reported. Spin-lattice relaxation times T1 of all the carbons in amino acids generally tend to decrease with increase in the concentration of electrolytes, the largest effects often being observed for the charged carboxylate groups of the amino acids. Carboxylic carbons in amino acids are the sensitive 'acceptor' of the 13C spin-lattice relaxation accelerating effects offered by electrolytes, and the 13C spin-lattice relaxation accelerating ability of electrolytes decreases in the order Mg(ClO4)2 > MgCl2 > CaCl2 > NaCl > KCl > LiClO4 > NaOH. The mechanisms of the observed phenomena are discussed in terms of intermolecular interaction, paramagnetic impurities in electrolytes and other mechanisms; large contributions of intermolecular interactions with electrolytes are present on complex formation between amino acids and metal ions and the incoming 'unsaturation' of the primary solvation shell of cations with the increase in electrolyte concentration.

Amino Acids↗
PubMed1992

Lateral conductance parallel to membrane surfaces: effects of anesthetics and electrolytes at pre-transition.

The effects of dilute salts and anesthetics were studied on the impedance dispersion in the dipalmitoylphosphatidylcholine (DPPC) liposomes. Below the pre-transition temperature, the apparent activation energy for conductance in DPPC-H2O without salts was equivalent to pure water, 18.2 kJ mol-1. This suggests that the mobile ions (H3O+ and OH-) interact negligibly with the lipid surface below the pre-transition temperature. At pre-transition temperature, the apparent activation energy of the conductance decreased by the increase in the DPPC concentrations. The effects of various salts (LiCl, NaCl, KCl, KBr, and KI) on the apparent activation energy of the conductance were studied. Changes in anions, but not in cations, affected the activation energy. The order of the effect was Cl- less than Br- less than I-. Cations appear to be highly immobilized by hydrogen bonding to the phosphate moiety of DPPC. The smaller the ionic radius, the more ions are fixed on the surface at the expense of the free-moving species. The apparent activation energy of the transfer of ions at the vesicle surface was estimated from the temperature-dependence of the dielectric constant, and was 61.0 kJ mol-1 in the absence of electrolytes. In the presence of electrolytes, the order of the activation energy was F- greater than Cl- greater than Br- greater than I-. When the ionic radius is smaller, these anions interact with the hydration layer at the vesicle surface and the ionic transfer may become sluggish. In the absence of electrolytes, the apparent activation energy of the dielectric constant decreased by the increase in halothane concentrations. In the presence of electrolytes, however, the addition of halothane increased the apparent activation energy. We propose that the adsorption of halothane on the vesicle surface produces two effects: (1) destruction of the hydration shell, and (2) increase in the binding of electrolytes to the vesicle surface. In the absence of electrolytes, the first effect predominates and the apparent activation energy is decreased. In the presence of electrolytes, the latter effect predominates and the apparent activation energy is increased.

1,2-Dipalmitoylphosphatidylcholine↗
PubMed1995

Fluid-electrolyte changes in physically conditioned subjects after hypokinesia and chronic hyperhydration.

The aim of this study was to determine whether fluid-electrolyte changes, which are developed during prolonged hypokinesia (decreased number of km per day), can be prevented or minimized with the use of a daily intake of fluid and salt supplementation (FSS). The experiments on hypokinesia (HK) were performed for 364 days on 18 endurance-trained male volunteers in the age range of 21-23 years, with an average maximum oxygen uptake of 67 ml kg-1. All volunteers were divided into three equal groups: six volunteers were placed on a continuous regime of exercise of 14.0 km day-1 and served as control subjects. Six volunteers were subjected to continuous HK without FSS and were considered as the unsupplemented hypokinetic subjects (UHS). The remaining volunteers were under continuous HK and FSS and were considered as the supplemented hypokinetic subjects (SHS). For the simulation of the hypokinetic effect, the UHS and SHS groups were kept continuously under an average of 2.7 km day-1 for the duration of the experiment. Prior to exposure to HK, all volunteers were on the same exercise regime as the controls. During the pre-experimental period of 60 days and during the post-experimental period, urinary excretion of electrolytes and concentrations of sodium, potassium, calcium and magnesium in serum as well as serum osmolality were determined. An increased renal excretion of fluid and electrolytes and a decreased serum electrolyte concentration were observed in the SHS, while a decreased renal excretion of fluid and electrolytes and an increased serum electrolyte concentration were observed in the UHS, during the initial stages of the post-hypokinetic period. By day 30 of the post-hypokinetic period these changes were reverted back to the control levels. We concluded that chronic hyperhydration may be used to attenuate urinary and serum electrolyte changes in endurance-trained volunteers after exposure to prolonged HK.

Adolescent↗
PubMed1993

Site specificity and meal stimulation of the intestinal absorption of water, electrolytes, and bile acids.

Ileal water and electrolyte absorption exceed jejunal absorption in both the basal and meal-stimulated states. The purposes of these experiments were to determine: (1) if luminal bile acids alter basal or meal-stimulated intestinal absorption, and (2) if there is site specificity or meal stimulation of intestinal bile acid absorption. Twenty-five centimeters of canine proximal jejunal and distal ileal Thiry-Vella fistulas were constructed. Simultaneous jejunal and ileal absorption studies (n = 88) were performed with a luminal perfusate containing polyethylene glycol labeled with radioactive carbon-14 to calculate the absorption of water, electrolytes, and the bile acid taurocholate (TC). In group 1, there was no TC in the luminal perfusate, whereas in group 2, 10 mM of TC was present in the luminal perfusate. Half of the observations were performed after a meal stimulus, which consisted of an orally ingested, 480-kcal mixed nutrient meal. Intraluminal TC did not affect basal or meal-stimulated water or electrolyte absorption. In both the basal and meal-stimulated states, ileal absorption of water, electrolytes, and TC significantly exceeded jejunal absorption (p < 0.05). A meal significantly stimulated water and electrolyte absorption in both the jejunum and ileum, but it stimulated absorption of TC in the ileum only (p < 0.05). Intraluminal TC does not alter basal or meal-stimulated intestinal water and electrolyte absorption. A meal stimulates increased water and electrolyte absorption in both the jejunum and the ileum, but it stimulates bile acid absorption in the ileum only. Bile acid absorption is site specific and responsive to a meal stimulus.

Animals↗
PubMed1976

Intestinal absorption of water and electrolytes.

1. Recent advances in knowledge of intestinal physiology have provided some insight into disturbed mechanisms and their clinical effects; for example, diarrhoea can now be defined biochemically as excessive fluid and electrolyte loss due to their malabsorption or excessive secretion. 2. Because of differences in structure and in absorptive and secretory mechanisms, the various parts of the gut perform different functions. In the jejunum, transport activity is extensive and the rapid equilibration of its content provides the optimal absorptive mixture. Functionally, the ileum and colon are similar; compared with the jejunum, they have greater absorptive capacity for electrolytes and generate significantly higher transmural electrical potentials. In the colon, some transport mechanisms are potentiated by adrenocortical steroids. 3. Water and electrolyte absorption and secretion are the end-products of bidirectional fluxes across the intestinal wall that are several times greater than net movement in either direction. Secretion is the surplus of negative flux (into the lumen) and absorption the surplus of positive flux (out of it). 4. Many electrolyte transport mechanisms require the absorption of other electrolytes or non-electrolytes, and some are concerned with electrolyte exchange. Water transport is always passive, in the direction of solute flow, but its solvent drag can move solutes across the intestinal membrane.

Adult↗
PubMed2003

Modification and validation of the pyromellitic acid electrolyte for the capillary electrophoretic determination of anions.

For the determination of inorganic and organic anions, the pyromellitic acid (PMA) electrolyte is widely used. The pH adjustment of the self-prepared electrolyte was very challenging to satisfy the pH of specification of pH 7.8 +/- 0.1. A modification was proposed to provide a more simple electrolyte by buffering the PMA electrolyte with triethanolamine (TEA) only instead of adjusting the pH by NaOH and TEA. Thus, the proposed electrolyte consisted of 2.25 mmol l(-1) PMA, 0.75 mmol 1(-1) hexamethonium hydroxide and 12 mmol 1(-1) TEA. The performance of the PMA electrolyte buffered by TEA only was compared to a commercial available PMA and statistically validated in accordance with the methodology of Taguchi. No statistically significant difference could be found for both electrolytes assessing the performance and detection limits of hydrodynamic, stacking and electrokinetic injection with transient isotachophoretic preconcentration as well as repeatability of migration times, peak resolutions and peak symmetries.

Benzoates↗
PubMed2000

Influence of pH*-value of methanolic electrolytes on electroosmotic flow in hydrophilic coated capillaries.

The dependency of EOF on the H+-concentration and the related so called pH* value of methanolic electrolytes has been examined with poly(ethylene glycol) (PEG), poly(vinyl alcohol) (PVA) and uncoated capillaries. These results were compared with the pH dependency of EOF of these capillaries using aqueous buffers. In uncoated capillaries the dependency of EOF on the pH(*)-value is very similar for aqueous and methanolic electrolytes. The EOF increases with increasing H+-concentration and pH-hysteresis is observed. In PVA coated capillaries the EOF is strongly reduced over wide pH* or pH ranges for both methanolic electrolytes and aqueous buffers. The EOF in PEG coated capillaries is surprisingly directed to the anode with methanolic electrolytes whereas a reduced cathodic EOF is observed in aqueous electrolytes. The anodic EOF of PEG-coated capillaries in methanolic electrolytes is independent of the pH*-value. The usefulness of PEG- and PVA-coated capillaries for adjusting the EOF in non-aqueous electrolytes for the analysis of isomeric organic acids was demonstrated.

Electrochemistry↗
PubMed2002

Fluid and salt supplementation effect on body hydration and electrolyte homeostasis during bed rest and ambulation.

Bed rest (BR) induces significant urinary and blood electrolyte changes, but little is known about the effect of fluid and salt supplements (FSS) on catabolism, hydration and electrolytes. The aim was to measure the effect of FSS on catabolism, body hydration and electrolytes during BR. Studies were done during 7 days of a pre-bed rest period and during 30 days of a rigorous bed rest period. Thirty male athletes aged, 24.6 +/- 7.6 years were chosen as subjects. They were divided into three groups: unsupplemented ambulatory control subjects (UACS), unsupplemented bed rested subjects (UBRS) and supplemented bed rested subjects (SBRS). The UBRS and SBRS groups were kept under a rigorous bed rest regime for 30 days. The SBRS daily took 30 ml water per kg body weight and 0.1 sodium chloride per kg bodyweight. Plasma sodium (Na), potassium (K), calcium (Ca) and magnesium (Mg) levels, urinary Na, K, Ca and Mg excretion, plasma osmolality, plasma protein level, whole blood hemoglobin (Hb) and hematocrit (Hct) level increased significantly (p < or = 0.05), while plasma volume (PV), body weight, body fat, peak oxygen uptake, food and fluid intake decreased significantly (p < or = 0.05) in the UBRS group when compared with the SBRS and UACS groups. In contrast, plasma and urinary electrolytes, osmolality, protein level, whole blood Hct and Hb level decreased significantly (p < or = 0.05), while PV, fluid intake, body weight and peak oxygen uptake increased significantly (p < or = 0.05) in the SBRS group when compared with the UBRS group. The measured parameters did not change significantly in the UACS group when compared with their baseline control values. The data indicate that FSS stabilizes electrolytes and body hydration during BR, while BR alone induces significant changes in electrolytes and body hydration. We conclude that FSS may be used to prevent catabolism and normalize body hydration status and electrolyte values during BR.

Adaptation, Physiological↗
PubMed2003

Analysis of excess Gibbs energy of electrolyte solutions: a new model for aqueous solutions.

This paper presents an analysis of the excess Gibbs free energy of aqueous electrolytes. The analysis of experimental data leads to the conclusion that the equilibrium state for dilute univalent electrolytes in water involves an intercalation of water and ionic liquid crystal domains. Excess free energy of the solution is determined by the Madelung energy of hydrated ion-pair liquid crystals, and the energy associated with a shift in the structural equilibrium of water. The data that point to such a model include: molecular orbital-molecular dynamics applied to electrolyte water systems; Raman spectra; infrared spectra; magnetic resonance spectra of ions; the apparent density of water; and the excess free energy of electrolytes in aqueous solutions. Molecular orbital-molecular dynamics calculations of relatively large water clusters containing a molecule of sodium iodide show that the solvent separated ion pair exists in a substantial potential well compared to other possible structures. Raman spectra of univalent electrolyte solutions as a function of concentration can be quantitatively modeled using only the spectra of pure water and electrolyte solution at the concentration of the solvent separated ion pair. The other observations are consistent with the structures proposed from the Raman spectral study. The new model provides a satisfactory account of the fact that the excess free energy of dilute (<0.2 mol/l) solutions is generally more negative than anticipated on the basis of Debye-Hückel theory, and that the equilibrium evidence points to the same functional behavior at very low concentrations as is seen at 0.05 mol/l. We present a testable hypothesis that the excess free energy, and other thermodynamic properties of the solutions do not follow the Debye-Hückel limiting law. The tests of this hypothesis must involve only equilibrium measurements at concentrations between 0.05 and 0.0005 mol/l. This hypothesis concerning the structure of aqueous electrolyte solutions is not in conflict in any way with the Debye-Hückel-Onsager theory of electrical conductivity.

Electrolytes↗
PubMed2001

The electrochemical oxide growth behaviour on titanium in acid and alkaline electrolytes.

Titanium implants have a thin oxide surface layer. The properties of this oxide layer may explain the good biocompatibility of titanium implants. Anodic oxidation results in a thickening of the oxide film, with possible improved biocompatability of anodized implants. The aim of the present study was twofold: (1) firstly, to characterize the growth behaviour of galvanostatically prepared anodic oxide films on commercially pure (c.p.) titanium and (2) secondly, to establish a better understanding of the electroche0mical growth behaviour of anodic oxide on commercially pure titanium (ASTM grade 1) after changes of the electrochemical parameters in acetic acid, phosphoric acid, calcium hydroxide, and sodium hydroxide under galvanostatic anodizing mode. The oxide thickness was measured by Ar sputter etching in Auger Electron spectroscopy (AES) and the colours were estimated by an L*a*b* system (lightness, hue and saturation) using a spectrophotometer. In the first part of our study, it was demonstrated that the interference colours were useful to identify the thickness of titanium oxide. It was also found that the anodic forming voltages with slope (dV/dt) in acid electrolytes were higher than in alkaline electrolytes. Each of the used electrolytes demonstrates an intrinsically specific growth constant (nm/V) in the range of 1.4--2.78 nm/V. In the second part of our study we found, as a general trend, that an increase of electrolyte concentration and electrolyte temperature respectively decreases the anodic forming voltage, the anodic forming rate (nm/s) and the current efficiency (nm.cm(2)/C), while an increase of the current density and the surface area ratio of the anode to cathode increase the anodic forming voltage, the anodic forming rate and the current efficiency. The effects of electrolyte concentration, electrolyte temperature, and agitation speed were explained on the basis of the model of the electrical double layer.

Acetic Acid↗