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Results for “Ophthalmodynamometry”

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At least 487 records · Page 27Linked to original sources
PubMed2003

Reproducibility of ophthalmodynamometric measurements of central retinal artery and vein collapse pressure.

BACKGROUND: To assess the reproducibility of ophthalmodynamometric measurements using a new, Goldmann contact lens associated, device allowing biomicroscopic visualisation of the optic disc. METHODS: The prospective clinical study included 87 eyes of 58 subjects presenting with a normal fundus (n=40), or ocular diseases (n=47). With topical anaesthesia, a Goldmann contact lens, fitted with a pressure sensor mounted into the holding ring of the contact lens, was placed onto the cornea. Pressure was applied onto the globe through the contact lens, and the pressure values obtained when the central retinal vessels started pulsating were noted. The measurements were performed 10 times. RESULTS: The mean coefficients of variation for redeterminations of the collapse pressure of the central retinal vein and artery were 16.3% (SD 11.4%), and 8.5% (4.1%), respectively. CONCLUSIONS: A simple and new, Goldmann contact lens associated, ophthalmodynamometer allows central retinal artery and vein collapse pressure measurements which are reproducible in a clinical setting.

Adult↗
PubMed2003

Central retinal artery and vein collapse pressure in eyes with chronic open angle glaucoma.

AIMS: To determine central retinal vessel collapse pressure in chronic open angle glaucoma. METHODS: For 19 eyes with chronic open angle glaucoma and 27 eyes of a control group, central retinal vessel collapse pressure was measured by a Goldmann contact lens fitted with a pressure sensor in its holding grip. RESULTS: Central retinal vein collapse pressure was significantly (p=0.001) higher in the glaucoma group than in the control group (26.1 (SD 26.4) relative units versus 6.1 (8.4) relative units). CONCLUSIONS: Measured by a new ophthalmodynamometer, central retinal vein collapse pressure measurements may be abnormally high in eyes with chronic open angle glaucoma.

Adult↗
PubMed1999

Ocular volume change per minute with ocular pneumoplethysmography.

Ocular pneumoplethysmography was performed before and after 1,737 carotid endarterectomies, 82% of which were performed for carotid lesions of hemodynamic consequence. Preoperative ocular hypoperfusion without ischemia was associated with at least transient postoperative ocular hyperemia. A difference in ocular volume change per minute of 14.0%, female greater than male, was explained by sex differences in heart rate, brachial pulse pressure and eye size. These observations may have a direct application in the management of diabetic retinopathy with panretinal photocoagulation.

Blood Pressure↗
PubMedDate not supplied

Effect of pneumatic suction ring placement on intraocular pressure in cats.

PURPOSE: To determine the effect of placing a pneumatic suction ring on intraocular pressure (IOP) in the cat and to design an improved method to generate a stable elevation of IOP. METHODS: A pneumatic suction ring was applied to the eye in cats while the IOP was monitored. Three groups of animals (10 per group) were used. A vacuum pressure of 450 mbar was applied in one step to eyes of group 1 (anesthetized) and to group 2 (euthanized) cats. In group 3 (anesthetized) cats, an initial vacuum pressure of 250 mbar was applied, followed by a vacuum of slowly increasing pressure at a rate of 5 mbar/min for a total of 40 min to 450 mbar. RESULTS: After the one-step application of a vacuum (450 mbar) to the eyes of anesthetized cats (group 1), IOP peaked within the first minute from a basal value of 25 +/- 2 mm Hg (mean +/- SD) to 90 +/- 7 mm Hg. It then rapidly decreased to 69 +/- 2 mm Hg 5 min later and continued to decrease to 39 +/- 4 mm Hg 40 min later. This sharp peak and decline of IOP were also observed in eyes of euthanized cats (group 2). The basal IOP of these eyes was 8 +/- 1 mm Hg. It rose to 18 +/- 2 mm Hg immediately after the application of vacuum pressure (450 mbar) and returned to the basal level 5 min later. In contrast, the eyes of group 3 receiving an initial vacuum of 250 mbar followed by a 5 mbar/min vacuum increment exhibited a rapid increase in IOP and a very stable plateau (mean IOP = 62-68 mm Hg), lasting the whole study period (40 min). CONCLUSION: IOP after a one-step application of a vacuum via a pneumatic suction ring is self-adjusting and declines rapidly over time. This decline in IOP can be overcome by a supplementary increment in vacuum pressure.

Animals↗
PubMed1977

Comparative Doppler directional sonographic and ophthalmodynamographic study in the occlusion of the internal carotid artery.

In the occlusion of the internal carotid artery, the change occurring in the internal-external carotid pressure gradient may cause flow reversal within the ophthalmic artery and its branches. Ophthalmodynamographic, Doppler directional sonographic and angiographic investigations were performed in 21 cases (11 total occlusions, 6 severe and 4 moderate stenoses of the internal carotid artery). The authors compare the results of these investigations and discuss the practical importance of Doppler directional sonography and the significance of flow reversal in the ophthalmic artery.

Adult↗