Effect of U74006F (Tirilazad Mesylate) in rabbit eyes after argon laser trabeculoplasty.
A new free radical scavenger, U74006F (Upjohn Company, Kalamazoo, MI, USA) was studied to determine if it would have a beneficial effect on preventing intraocular pressure (IOP) spikes and reducing blood-aqueous barrier (BAB) breakdown in rabbits after argon laser trabeculoplasty (ALT). The post-ALT IOP averaged 24.7 mm Hg (+/- 3.8 mm Hg; N = 6) and 30.3 mm Hg (+/- 6.9 mm Hg; N = 7) at 1 hour (p = 0.097) and 22.7 mm Hg (+/- 1.9) and 27.3 mm Hg (+/- 7.0 mm Hg) at 3 hours in the U74006F and vehicle groups (p = 0.137), respectively. By 48 hours, the IOP averaged 12.8 +/- 2.2 mm Hg in the U74006F group and 12.4 +/- 2.4 mm Hg in the vehicle group (P = 0.757). The aqueous fluorescein permeability (AFP) between lasered and unlasered eyes was determined for the U74006F and vehicle-treated groups by aqueous fluorophotometry. Prelaser or baseline AFP was determined for the U74006F (-0.236 +/- 0.236) and vehicle (-0.145 +/- 0.237) groups (p = 0.505). At day 2 posttreatment, the U74006F group and the placebo group both reported similar AFP of 5.109 +/- 4.831 and 5.680 +/- 4.280 (p = 0.827), respectively. At one week post-ALT, AFP for the U74006F group (0.109 +/- 0.367) had returned close to baseline, while that of the vehicle group (0.426 +/- 0.511) was still quite elevated (p = 0.220). U74006F appears to be beneficial in the prevention of acute elevation of IOP following ALT but not in the prevention of Blood-Aqueous Barrier (BAB) breakdown.(ABSTRACT TRUNCATED AT 250 WORDS)
Fiscella
R G
RG
University of Illinois, Chicago.
Asrani
S G
SG
Hillman
D S
DS
Rusin
M M
MM
Le
H
H
D000818:Animals; D002199:Capillary Permeability / Q000187:drug effects; D005260:Female; D016166:Free Radical Scavengers; D007429:Intraocular Pressure / Q000187:drug effects*; D053685:Laser Therapy; D008054:Lipid Peroxides / Q000037:antagonists & inhibitors*; D008297:Male; D009798:Ocular Hypertension / Q000378:metabolism / Q000517:prevention & control; D011281:Pregnatrienes / Q000494:pharmacology*; D011817:Rabbits; D014130:Trabeculectomy
D016166:Free Radical Scavengers; D008054:Lipid Peroxides; D011281:Pregnatrienes; C053355:tirilazad