Maintenance Fluid Therapy: Isotonic Versus Hypotonic Solutions.

Area of Science:

• Veterinary Medicine
• Animal Physiology

Background:

• Maintenance fluid therapy replaces ongoing water and salt losses when oral intake is not possible in small animals.
• Hospitalized dogs and cats can experience disrupted osmoregulation due to stimuli for antidiuretic hormone release, leading to water retention.
• Severe illness can cause both sodium and water retention, resulting in edema.

Purpose of the Study:

• To highlight the challenges in maintenance fluid therapy for hospitalized small animals.
• To discuss the potential risks associated with commercially available fluids.
• To provide guidance on tailoring fluid administration for specific patient needs.

Main Methods:

• Review of physiological responses to fluid therapy in ill animals.
• Analysis of electrolyte and osmolality imbalances from standard fluid formulations.
• Discussion of clinical consequences of inappropriate fluid administration.

Main Results:

• Hospitalized animals are prone to water retention due to hormonal changes.
• Commercial fluids often have electrolyte concentrations that differ significantly from maintenance needs.
• Administration of excess water or sodium can lead to hypoosmolality and edema.

Conclusions:

• Standard fluid therapy may not meet the specific needs of hospitalized small animals.
• Careful consideration of fluid composition is crucial to avoid adverse effects like edema.
• Tailoring fluid therapy based on individual patient goals is recommended for optimal outcomes.