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Background  Hyperosmolar agents frequently are used to decrease intracranial pressure but their effects on electrolyte and acid‐base variables have not been prospectively investigated.    Objectives  Compare duration and magnitude of changes in electrolyte and acid‐base variables after hyperosmolar treatment.    Animals  Twenty‐eight client‐owned dogs with intracranial hypertension caused by various pathologies.    Methods  Prospective, randomized, nonblinded, experimental cohort study. Fifteen dogs received a single dose (4 mL/kg) of 7.2% hypertonic saline (HTS), 13 dogs received 20% mannitol (MAN) 1 g/kg IV. Electrolyte and acid‐base variables were measured before (T 0 ), and 5 (T 5 ), 60 (T 60 ), and 120 (T 120 ) minutes after administration. Variables were compared between treatments and among time points within treatment groups.    Results  Mean plasma sodium and chloride concentrations were higher after HTS than MAN at T 5  (158 vs 141 mEq/L; 126 vs 109 mEq/L) and significant differences were maintained at all time points. After HTS, plasma sodium and chloride concentrations remained increased from T 0  at all time points. After MAN, plasma sodium and chloride concentrations decreased at T 5 , but these changes were not maintained at T 60  and T 120 . Plasma potassium concentration was lower at T 5  after HTS compared with T 0  (3.6 vs 3.9 mEq/L) and compared to MAN (3.6 vs 4.1 mEq/L). At T 60  and T 120 , plasma ionized calcium concentration was lower after HTS than MAN (1.2 vs 1.3 mmol/L). No significant differences were found in acid‐base variables between treatments.    Conclusions and Clinical Importance  At the administered dose, dogs receiving HTS showed sustained increases in plasma sodium and chloride concentrations, whereas dogs receiving MAN showed transient decreases. Future studies should assess the effects of multiple doses of hyperosmolar agents on electrolyte and acid‐base variables.

journal of veterinary internal medicine

Comparison of the effects of 7.2% hypertonic saline and 20% mannitol on electrolyte and acid‐base variables in dogs with suspected intracranial hypertension