A pilot study of in vivo venous pressures in the pig retinal circulation

Authors: Westlake, William H; Morgan, William H; Yu, Dao-Yi

Source: Clinical & Experimental Ophthalmology, Volume 29, Number 3, June 2001 , pp. 167-170(4)

Publisher: Blackwell Publishing

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Abstract:

Retinal venous pressure was examined in six pigs using a balanced servo-nulling micropuncture technique. The mean transmural venous pressure was 0.95 mmHg (SD 1.50 mmHg). The transmural venous pressure was lower at the optic disc than away from the disc (0.32 ± 1.46 mmHg vs 1.69 ± 1.19 mmHg, P < 0.01). At the disc a transmural pressure of zero or less (0 to -0.5 mmHg) was demonstrated in 10/21 (48%) of the disc readings. Over an intraocular pressure range of 15-26 mmHg there was a strong correlation between intraocular pressure and retinal venous pressure (Pearson coefficient r = 0.92). The results are compatible with the Starling resistor theory of venous outflow from the eye.

Keywords: pig; retinal vein pressure; Starling resistor; vascular waterfall

Document Type: Research article

DOI: 10.1046/j.1442-9071.2001.00399.x

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