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(Investigative Ophthalmology and Visual Science. 2004;45:2732-2736.)
© 2004 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.04-0083
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H-7 Effect on Outflow Facility after Trabecular Obstruction Following Long-Term Echothiophate Treatment in Monkeys

B’Ann T. Gabelt, Elizabeth A. Hennes, Jennifer L. Seeman, Baohe Tian, and Paul L. Kaufman

From the Department of Ophthalmology and Visual Sciences, University of Wisconsin, Madison, Wisconsin.

PURPOSE. To determine whether H-7 can enhance outflow facility after trabecular meshwork obstruction by extracellular material that accumulates after long-term treatment of monkeys with the cholinesterase inhibitor echothiophate iodide (ECHO).

METHODS. Cynomolgus monkeys were treated topically with 150 µg ECHO in one (n = 4 eyes) or both (n = 8 eyes) eyes for up to 48 weeks. Accommodation response to topical pilocarpine was monitored periodically. Outflow facility response to H-7 was measured by two-level constant pressure perfusion on three or four different occasions after intraocular pressure was elevated for 12 to 18 weeks.

RESULTS. Long-term treatment with ECHO decreased the accommodative response to pilocarpine and increased intraocular pressure, as has been reported. Baseline outflow facility was decreased by 46% ± 7% (n = 12, P < 0.001). H-7 partially restored baseline outflow facility measured during subsequent perfusions while ECHO treatment was continued. Concurrent H-7 enhanced outflow facility by 73% ± 18% (n = 12, P < 0.005) beyond the same-day baseline in ECHO-treated eyes. Cessation of ECHO treatment further restored baseline outflow facility, and the outflow facility response to H-7.

CONCLUSIONS. H-7 can enhance OF in the presence of trabecular obstruction produced by long-term ECHO treatment. This suggests that H-7 may be useful in treating glaucoma, even in the presence of accumulated plaque material that has been described previously.






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Copyright © 2004 by the Association for Research in Vision and Ophthalmology