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Bumetanide and cerebrospinal fluid acid-base variables during acute CO2 elevation
1Pulmonary Section, Veterans Administration Medical Center, Cincinnati, OH 45220.
Respiration Physiology
|January 1, 1990
Summary
Bumetanide, a NaCl cotransport inhibitor, did not alter cisternal cerebrospinal fluid (CSF) acid-base balance or ionic composition during acute respiratory acidosis (ARA) in dogs. The drug showed no significant effect on CSF [HCO3-] or [Na(+)-Cl-] levels compared to controls.
Area of Science:
- Neuroscience
- Physiology
- Pharmacology
Background:
- Cerebrospinal fluid (CSF) acid-base balance is crucial for central nervous system function.
- Acute respiratory acidosis (ARA) significantly impacts CSF acid-base homeostasis.
- NaCl cotransport plays a role in regulating CSF ionic composition and pH.
Purpose of the Study:
- To investigate the effects of bumetanide, a NaCl cotransport inhibitor, on cisternal CSF acid-base balance during ARA.
- To determine if bumetanide alters CSF ionic composition, specifically [Na(+)-Cl-], under conditions of ARA.
Main Methods:
- Anesthetized, mechanically ventilated dogs with ligated renal pedicles were used.
- Bumetanide or saline was administered intravenously prior to inducing ARA.
- Blood and cisternal CSF acid-base variables and ionic composition were measured during a 5-hour period of controlled hypercapnia (ARA).
Main Results:
- PaCO2 was maintained between 55-60 mm Hg in both groups during ARA.
- Mean cisternal CSF PCO2 increased by approximately 20 mm Hg in both bumetanide and control groups.
- No significant differences were observed in CSF [HCO3-] or CSF [Na(+)-Cl-] between the bumetanide-treated group and the control group during ARA.
Conclusions:
- Bumetanide, at the tested dose, does not affect the acid-base balance or ionic composition of cisternal CSF during ARA in dogs.
- The similar changes in CSF [Na(+)-Cl-] in both groups suggest that any potential inhibition of Cl- influx by bumetanide was proportional to Na+ influx.