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  • Title: The effect of intravenous mannitol or oral glycerol on intraocular pressure in dogs.
    Author: Lorimer DW, Hakanson NE, Pion PD, Merideth RE.
    Journal: Cornell Vet; 1989 Jul; 79(3):249-58. PubMed ID: 2502361.
    Abstract:
    The effect of IV mannitol (1.5 gm/kg) or oral glycerol (1.4 and 2.0 gm/kg) on intraocular pressure (IOP) and serum osmolality (SOSM) was investigated in 24 normal dogs. Mean IOPs were significantly decreased from baseline values from 0.5 through 5.5 hours following mannitol administration with a mean maximum depression of 8.7 +/- 1.8 mm Hg whereas mean SOSM was significantly increased from baseline values. Mean IOPs were significantly decreased from baseline values from 1.0 through 10 hours following oral administration of 1.4 gm/kg glycerol with a mean maximal depression of 5.4 +/- 2.7 mm Hg. Mean SOSM increased initially followed by a significant decrease. The change in IOP following mannitol administration showed less variation (smaller standard deviations) than glycerol (1.4 gm/kg). Five of the 6 dogs that received the 2.0 gm/kg glycerol vomited; the mean IOP and SOSM values were not significantly altered from baseline values in these dogs. Four of 5 dogs given cooled (10C) 2.0 gm/kg glycerol vomited. The incidence of vomiting appeared to be dose related. Both mannitol and glycerol (1.4 gm/kg) are effective for decreasing IOP in normal dogs.
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