AI Article Synopsis
- The study aims to investigate whether increased vascular resistance in the central retinal and ophthalmic arteries contributes to central retinal vein occlusion (CRVO) or if such changes occur as a secondary response to vein occlusion.
- The researchers examined blood flow dynamics in 20 non-ischaemic and 13 ischaemic CRVO patients, comparing them to 22 control subjects using colour Doppler imaging, while also assessing the effects of panretinal photocoagulation (PRP) treatment on ischaemic cases.
- Results indicated that ischaemic CRVO patients had notably lower blood flow velocities in their central retinal and ophthalmic arteries compared to both their fellow eyes and non-ischaemic cases, with further reductions noted following PRP treatment,
Article Abstract
Aims: To determine whether an increase in vascular resistance in the central retinal and ophthalmic arterial circulations contributes to the development of central retinal vein occlusion (CRVO), or haemodynamic alterations in central retinal and ophthalmic arteries occur secondary to the vein occlusion as increased intravascular pressure is transferred through the capillary bed to the arterial side and the effect of panretinal photocoagulation treatment on these circulations in ischaemic cases.
Methods: The ophthalmic and central retinal arteries of the affected and non-affected eyes of 20 patients with non-ischaemic CRVO, 13 patients with ischaemic CRVO, and 22 control subjects were investigated by colour Doppler imaging. Panretinal photocoagulation (PRP) treatment was applied to the eyes with ischaemic CRVO. Maximum and minimum blood flow velocities, and resistivity indexes were calculated in the affected and healthy eyes of patients and in the control eyes.
Results: Average blood flow velocity in the central retinal and ophthalmic arteries of patients with non-ischaemic CRVO did not differ from their fellow eyes, but a significantly lower average blood flow velocity was found in the ophthalmic and central retinal arteries of the patients with ischaemic CRVO compared with their fellow eyes. Patients with ischaemic CRVO had significantly lower blood flow velocities in their ophthalmic and central retinal arteries than non-ischaemic cases that were further reduced following PRP treatment.
Conclusion: This study suggests that impaired arterial blood flow observed in patients with CRVO may be partly related to secondary changes in the retrobulbar arterial circulation as a result of enhanced arterial resistance following CRVO. These data also demonstrate that PRP treatment decreases retinal and ophthalmic blood flow velocities in patients with ischaemic CRVO.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1722785 | PMC |
| http://dx.doi.org/10.1136/bjo.83.1.50 | DOI Listing |
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