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Abstract #12997 Published in IGR 7-3
Effect of age on outflow resistance washout during anterior chamber perfusion in rhesus and cynomolgus monkeys
Kiland JA; Gabelt BT; Kaufman PLExperimental Eye Research 2005; 81: 724-730
When aqueous humour outflow resistance is measured by two-level constant pressure perfusion in non-human primate eyes, a progressive decrease in outflow resistance, known as the 'washout effect' occurs with time. The effect of age on total outflow resistance washout (the reciprocal of outflow facility (OF)) was determined in rhesus and cynomolgus monkeys. In cynomolgus monkeys, the effect of time between exchange of the anterior chamber (AC) contents and post-exchange OF measurements on outflow resistance was also examined. Total OF was determined at baseline in one eye of 35 rhesus monkeys aged 4-29 yrs, and in 27 cynomolgus monkeys, aged 3-17 yrs, at baseline and after 10 min AC exchange with 1 or 2 ml Barany's perfusand or in Barany's containing 0.01-1% dimethyl sulfoxide (DMSO) or Tris base. Resistance washout did not differ with age at baseline in rhesus or cynomolgus monkeys. Similarly, no changes were found when comparing post-exchange resistance washout vs. age in cynomolgus monkeys that had undergone AC exchange with Barany's perfusand only or Barany's containing 0.01-1% DMSO or Tris base. Rate of resistance washout decreased with increased length of time between exchange of the AC contents and post-exchange outflow facility readings (-0.0004±0.0092 mmHg min-1 μl-1 yr-1 ; p = 0.016). Several explanations for these findings are plausible.
Dr. J.A. Kiland, Department of Ophthalmology and Visual Sciences, 600 Highland Avenue, Rm F4/321, University of Wisconsin Medical School, Madison, WI 53792, USA. jkiland@wisc.edu
Classification:
2.6.2 Outflow (Part of: 2 Anatomical structures in glaucoma > 2.6 Aqueous humor dynamics)
5 Experimental glaucoma; animal models