Furosemide and cerebrospinal fluid ions during acute respiratory acidosis

1989 ◽  
Vol 67 (2) ◽  
pp. 563-569 ◽  
Author(s):  
S. Javaheri ◽  
J. F. Freidel ◽  
P. J. Davis
Keyword(s):  
Cerebrospinal Fluid ◽  
Ionic Composition ◽  
Respiratory Acidosis ◽  
Base Line ◽  
Acid Base Balance ◽  
Acid Base ◽  
Mechanically Ventilated ◽  
Group I ◽  
Base Balance ◽  
Group Ii

The purpose of this study was to investigate the effects of furosemide, an inhibitor of NaCl cotransport, on cisternal cerebrospinal fluid (CSF) acid-base balance during acute respiratory acidosis (ARA). We measured blood and CSF acid-base variables in two groups (n = 7 in each) of anesthetized, paralyzed, and mechanically ventilated dogs with bilateral ligation of renal pedicles (to eliminate saluresis). After base-line samples were obtained (-1 h), furosemide (50 mg/kg) was administered intravenously within 15 min (group II); group I received an equal volume of half-normal saline. ARA was induced 1 h later (0 h) and arterial CO2 tension was maintained between 55 and 60 Torr for 5 h. Mean cisternal CSF PCO2 was 42.8 +/- 2.6 and 39.5 +/- 1.7 Torr, respectively in groups I and II and rose approximately 20 Torr during ARA. In group I, CSF [HCO3-] was 22.0 +/- 1.0, 24.8 +/- 0.6, and 25.4 +/- 1.6 meq/l, respectively at 0, 2.5, and 5 h. Respective values for group II were 22.2 +/- 1.3, 24.3 +/- 1.8, and 24.6 +/- 1.0 meq/l. These values were not significantly different from each other. In each group, CSF [Na+-Cl-] increased significantly during ARA, but the changes were not significantly different when the two groups were compared. We conclude that furosemide at the dose used in the present study does not change ionic composition and acid-base balance of cisternal CSF compared with control. Because changes in CSF [Na+-Cl-] during ARA were similar in both groups, any inhibition of Cl- influx into CSF by furosemide should have been proportional to that of Na+.

Acute respiratory acidosis: large-dose furosemide and cerebrospinal fluid ions

1994 ◽  
Vol 76 (6) ◽  
pp. 2651-2655 ◽  
Author(s):  
S. Javaheri ◽  
W. Corbett ◽  
J. M. Adams ◽  
P. J. Davis ◽  
P. S. Gartside
Keyword(s):  
Cerebrospinal Fluid ◽  
Large Dose ◽  
Ionic Composition ◽  
Respiratory Acidosis ◽  
Control Group ◽  
Mechanically Ventilated ◽  
Group I ◽  
Serial Serum ◽  
Group Ii ◽  
Nacl Cotransport

NaCl cotransport carrier is known to be involved in transepithelial fluid absorption and secretion in various tissues. Recent studies indicate that Na-K-2Cl cotransport carrier also exists in the choroid plexus cells and that inhibition of the carrier decreases cerebrospinal fluid (CSF) production. In this study, we used large-dose intravenous furosemide, an inhibitor of Na-K-2Cl carrier, to determine the effects on cisternal CSF ionic composition in acute respiratory acidosis. In pentobarbital-anesthetized mechanically ventilated dogs, renal pedicles were ligated to prevent furosemide-induced diuresis. The experimental group (group II, n = 7) received 400 mg/kg of furosemide intravenously, and group I (control group, n = 7) received the vehicle. In group II, serial serum and CSF furosemide concentrations were approximately 10(-3) and 10(-5) mol/l, respectively. During 5 h of acute respiratory acidosis in both groups, the mean arterial PCO2 increased approximately 25 Torr, with comparable changes in CSF PCO2. In both groups, CSF [HCO3-] and [H+] rose approximately 3 meq/l and 20 neq/l, respectively. Changes in CSF [Na+], [K+], [Cl-], and [Na(+)-Cl-] were also similar and were not significantly different from each other when the two groups were compared. These data show that furosemide at the dose that inhibits NaCl cotransport carrier does not significantly alter ionic composition of cisternal CSF.

scholarly journals Comparative analysis of using balanced and normal saline solutions as an intraoperative therapy in newborns

2019 ◽  
Vol 9 (2) ◽  
pp. 41-49 ◽  
Author(s):  
Marianna M. Nasser ◽  
Yurii I. Kucherov ◽  
Yuliya V. Zhirkova
Keyword(s):  
Normal Saline ◽  
Saline Solution ◽  
Infusion Therapy ◽  
Hemodynamic Parameters ◽  
Acid Base Balance ◽  
Metabolic Disturbances ◽  
Acid Base ◽  
Group I ◽  
Base Balance ◽  
Group Ii

The purpose of the study was to compare the values of acid base balance, electrolytic and hemodynamic parameters in newborns depending on the composition of intraoperative infusion therapy. The study was done in 60 newborns who were given Staerofundin ISO basic infusion (10 ml/kg/hour) in group I (n=31) and normal saline solution in group II (n=29) during a surgery.Results: following the surgery, no differences in pH values were observed between the groups, moderate metabolic disturbances were found. In Group II, levels of bicarbonates decreased from 22.2 to 20.5 (р=0.047). By the end of the surgery, normal electrolyte composition was found more frequently in group I (29%) as compared to group II (20%). Hypopotassemia (34.5% and 22.6%), hyperpotassemia (44.8% and 25.8%) and hyperchloremia (63% and 51.7%) were found more frequently in group II as compared to group I, respectively. To achieve the target level of blood pressure, the bolus was injected to 29% (n=9) of children from group I and 17.2% (n=5) of children from group II. Adrenergic agonists were used in 42% of children from group I and 27.6% of children from group II (р=0,038). There were no differences between the cumulative doses.Conclusion. Sterofundin and normal saline solution demonstrated equivalent values of effectiveness and produced similar effect on the values of acid base balance, electrolytic and hemodynamic parameters during the intraoperative period in newborns.

Evidence of active regulation of cerebrospinal fluid acid-base balance

1981 ◽  
Vol 51 (2) ◽  
pp. 369-375 ◽  
Author(s):  
S. W. Bledsoe ◽  
D. Y. Eng ◽  
T. F. Hornbein
Keyword(s):  
Cerebrospinal Fluid ◽  
Electrical Potential ◽  
Respiratory Acidosis ◽  
Respiratory Alkalosis ◽  
Electrical Potential Difference ◽  
Passive Transport ◽  
Acid Base Balance ◽  
Acid Base ◽  
Transport Control ◽  
Base Balance

To test the passive transport hypothesis of cerebrospinal fluid (CSF) [H+] regulation, we altered the relationship between plasma [H+] and the electrical potential difference between CSF and blood (PD) by elevating plasma [K+] during 6-h systemic acid-base disturbances. In five groups of pentobarbital-anesthetized dogs, we increased plasma [K+] from 3.5 to an average of 7.8 meq/l. Hyperkalemia produced an increase in the PD of 6.3 mV by 6 h with normal plasma acid-base status (pHa 7.4), of 8.3 mV with isocapnic metabolic acidosis (pHa 7.2), of 5.3 mV with isocapnic metabolic alkalosis (pHa 7.6), of 9.2 mV with isobicarbonate respiratory acidosis (PaCO2 61 Torr) and of 5.7 mV with isobicarbonate respiratory alkalosis (PaCO2 25 Torr). The change in CSF [H+] at 6 h in each group was the same as that observed in normokalemic animals (Am. J. Physiol. 228: 1134-1154, 1975). This result is not consistent with the passive transport hypothesis. The CSF-blood PD is therefore not an important determinant of CSF [H+] CSF [H+] homeostasis must result from some form of active transport control.

Ionic mechanisms of cerebrospinal fluid acid-base regulation

1983 ◽  
Vol 54 (1) ◽  
pp. 3-12 ◽  
Author(s):  
E. E. Nattie
Keyword(s):  
Cerebrospinal Fluid ◽  
Ionic Composition ◽  
Strong Ion Difference ◽  
Acid Base Balance ◽  
Acid Base ◽  
Co2 Partial Pressure ◽  
Base Balance ◽  
Ionic Mechanisms ◽  
Relationship Of

This review emphasizes the importance of strong ions in the regulation of cerebrospinal fluid (CSF) acid-base balance. In a solution like CSF that is devoid of nonbicarbonate buffers. [H+] and [HCO-3] are dependent variables, the independent variables being the CO2 partial pressure (PCO2) and the strong ion difference. Any measureable changes in CSF [HCO-3] and any change in [H+] that occur independent of changes in PCO2 must be accompanied by, if not caused by, changes in strong ions. The role of H+ and HCO-3 vs. strong ions in the ionic mechanisms of CSF acid-base regulation is unknown. For example, these mechanisms could depend only on changes in strong ions that accompany acid-base disorders, or they could be triggered by changes in [H+] or PCO2. These ideas are presented within the context of current concepts concerning the relationship of CSF to brain interstitial fluid (ISF) and the importance of choroid plexus and blood-brain barrier mechanisms in determining CSF and ISF ionic composition. Studies concerning CSF strong ions in normal and abnormal acid-base states are reviewed.

Acid-Base Balance in Cerebrospinal Fluid

1965 ◽  
Vol 12 (5) ◽  
pp. 479-496 ◽  
Author(s):  
J. B. POSNER ◽  
A. G. SWANSON ◽  
F. PLUM
Keyword(s):  
Cerebrospinal Fluid ◽  
Acid Base Balance ◽  
Acid Base ◽  
Base Balance

Acid-base balance and plasma composition in the aestivating lungfish (Protopterus)

1977 ◽  
Vol 232 (1) ◽  
pp. R10-R17 ◽  
Author(s):  
R. G. DeLaney ◽  
S. Lahiri ◽  
R. Hamilton ◽  
P. Fishman
Keyword(s):  
Plasma Osmolality ◽  
Respiratory Acidosis ◽  
Electrolyte Balance ◽  
Plasma Composition ◽  
Total Plasma ◽  
Acid Base Balance ◽  
Acid Base ◽  
Plasma Bicarbonate ◽  
Arterial Ph ◽  
Base Balance

Upon entering into aestivation, Protopterus aethiopicus develops a respiratory acidosis. A slow compensatory increase in plasma bicarbonate suffices only to partially restore arterial pH toward normal. The cessation of water intake from the start of aestivation results in hemoconcentration and marked oliguria. The concentrations of most plasma constituents continue to increase progressively, and the electrolyte ratios change. The increase in urea concentration is disproportionately high for the degree of dehydration and constitutes an increasing fraction of total plasma osmolality. Acid-base and electrolyte balance do not reach a new equilibrium within 1 yr in the cocoon.

Effects of temperature on acid-base balance and ventilation in desert iguanas

1981 ◽  
Vol 51 (2) ◽  
pp. 452-460 ◽  
Author(s):  
P. E. Bickler
Keyword(s):  
Steady State ◽  
Pulmonary Ventilation ◽  
Respiratory Acidosis ◽  
Lung Ventilation ◽  
Acid Base Balance ◽  
Acid Base ◽  
Arterial Ph ◽  
Blood Relative ◽  
Base Balance ◽  
History Of

The effects of constant and changing temperatures on blood acid-base status and pulmonary ventilation were studied in the eurythermal lizard Dipsosaurus dorsalis. Constant temperatures between 18 and 42 degrees C maintained for 24 h or more produced arterial pH changes of -0.0145 U X degrees C-1. Arterial CO2 tension (PCO2) increased from 9.9 to 32 Torr plasma [HCO-3] and total CO2 contents remained constant at near 19 and 22 mM, respectively. Under constant temperature conditions, ventilation-gas exchange ratios (VE/MCO2 and VE/MO2) were inversely related to temperature and can adequately explain the changes in arterial PCO2 and pH. During warming and cooling between 25 and 42 degrees C arterial pH, PCO2 [HCO-3], and respiratory exchange ratios (MCO2/MO2) were similar to steady-state values. Warming and cooling each took about 2 h. During the temperature changes, rapid changes in lung ventilation following steady-state patterns were seen. Blood relative alkalinity changed slightly with steady-state or changing body temperatures, whereas calculated charge on protein histidine imidazole was closely conserved. Cooling to 17-18 degrees C resulted in a transient respiratory acidosis correlated with a decline in the ratio VE/MCO2. After 12-24 h at 17-18 degrees C, pH, PCO2, and VE returned to steady-state values. The importance of thermal history of patterns of acid-base regulation in reptiles is discussed.

The effects of enforced activity on ventilation, circulation and blood acid-base balance in the aquatic gill-less urodele, Cryptobranchus alleganiensis; a comparison with the semi-terrestrial anuran, Bufo marinus

1980 ◽  
Vol 84 (1) ◽  
pp. 289-302
Author(s):  
R. G. Boutilier ◽  
D. G. McDonald ◽  
D. P. Toews
Keyword(s):  
Recovery Period ◽  
Respiratory Acidosis ◽  
Bufo Marinus ◽  
Acid Base Balance ◽  
Acid Base ◽  
Post Exercise ◽  
Arterial Blood ◽  
Cryptobranchus Alleganiensis ◽  
Base Balance ◽  
Lower Magnitude

A combined respiratory and metabolic acidosis occurs in the arterial blood immediately following 30 min of strenuous activity in the predominantly skin-breathing urodele, Cryptobranchus alleganiensis, and in the bimodal-breathing anuran, Bufo marinus, at 25 degrees C. In Bufo, the bulk of the post-exercise acidosis is metabolic in origin (principally lactic acid) and recovery is complete within 4-8 h. In the salamander, a lower magnitude, longer duration, metabolic acid component and a more pronounced respiratory acidosis prolong the recovery period for up to 22 h post-exercise. It is suggested that fundamental differences between the dominant sites for gas exchange (pulmonary versus cutaneous), and thus in the control of respiratory acid-base balance, may underline the dissimilar patterns of recovery from exercise in these two species.

Practical Evaluation of Acid-Base Balance

1957 ◽  
Vol 3 (5) ◽  
pp. 631-637
Author(s):  
Herbert P Jacobi ◽  
Anthony J Barak ◽  
Meyer Beber
Keyword(s):  
Respiratory Acidosis ◽  
Respiratory Alkalosis ◽  
Acid Base Balance ◽  
Bicarbonate Concentration ◽  
Acid Base ◽  
Plasma Bicarbonate ◽  
Practical Evaluation ◽  
Base Balance

Abstract The Co2 combining power bears a variable relationship to the in vivo plasma bicarbonate concentration, depending upon the type and severity of acid-base distortion. In respiratory alkalosis and metabolic acidosis the Co2 combining power will usually be greater than the in vivo plasma bicarbonate concentration; whereas, in respiratory acidosis and metabolic alkalosis the Co2 combining power will usually be less. Co2 content, on the other hand, will always parallel the in vivo plasma bicarbonate concentration quite closely, being only slightly greater. These facts, together with other considerations which are discussed, recommend the abandonment of the determination of CO2 combining power.

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