Consecutive water provocative tests in normal and glaucomatous Beagles

Area of Science:

• Veterinary Ophthalmology
• Animal Physiology

Background:

• Glaucoma is a leading cause of blindness in dogs.
• Intraocular pressure (IOP) is a key indicator of glaucoma.
• Provocative tests are used to assess the eye's response to stimuli.

Purpose of the Study:

• To evaluate the efficacy of water provocative tests in differentiating normal Beagles from those with glaucoma.
• To assess the IOP response to oral water loading in canine glaucoma models.

Main Methods:

• Normal and glaucomatous Beagles were subjected to water provocative testing.
• 50 ml/kg of water was administered via stomach tube.
• Schiotz tonometry was used to measure intraocular pressure for 90 minutes post-administration.

Main Results:

• Glaucomatous Beagles exhibited a significantly higher mean increase in Schiotz tonometric values (7.3–19.9 mm Hg) compared to normal dogs (3.1–8.6 mm Hg).
• Dogs with glaucoma demonstrated progressive and gradually increasing IOP responses.
• Water provocative tests showed a clear distinction between normal and glaucomatous canine eyes.

Conclusions:

• Water provocative testing is a valuable tool for diagnosing canine glaucoma.
• The test effectively highlights the compromised aqueous humor outflow in glaucomatous eyes.
• Further studies could explore variations in water dosage and timing for optimized diagnostic accuracy.