title: Direct measurement of retinal microvascular pressures in the live, anesthetized cat.
abstract: Microvascular pressures in retinal circulation were measured in living, anesthetized cat by the servonull micropuncture technique. Of the total vascular pressure drop 32% was in the segment proximal to the large retinal arteries when intraocular pressure was set at 10 mm Hg and decreased to 27% when intraocular pressure was increased to 20 mm Hg. The pressure in the retinal veins was substantially (> 7 mm Hg) greater than intraocular pressure at both values of intraocular pressure. There was negligible pressure drop within venous segment; however, the pressure drop from the retinal veins to the systemic veins was large and cannot be explained on the basis of a venous waterfall within the retina.
authors.affiliation: Biomedical Engineering Department, McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208.
authors.forename: M R
authors.initials: MR
authors.lastname: Glucksberg
authors.forename: R
authors.initials: R
authors.lastname: Dunn
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000502:physiology*; D002415:Cats; D008833:Microcirculation / Q000502:physiology; D008846:Micromanipulation; D012161:Retinal Artery / Q000502:physiology*; D012169:Retinal Vein / Q000502:physiology*