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Dynamic retinal vessel response to flicker in age‐related macular degeneration patients before and after vascular endothelial growth factor inhibitor injection
Author(s) -
Lanzl Ines M.,
Seidova SeidFatima,
Maier Mathias,
Lohmann Chris,
SchmidtTrucksäss Arno,
Halle Martin,
Kotliar Konstantin E.
Publication year - 2011
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2009.01718.x
Subject(s) - medicine , retinal , ophthalmology , macular degeneration , quartile , retinal artery , confidence interval
. Purpose: Retinal vessel responses to flickering light are different in various systemic and ocular diseases and can be improved after successful therapy. We investigated retinal vessel response to flickering light in age‐related macular degeneration (AMD) patients before and after treatment with a single intravitreal bevacizumab (Avastin ® ) injection. Methods: In 10 patients with exudative AMD [age: median (1.quartile; 3.quartile) 76.0 (73.5; 80.0) years], retinal vessel reactions were examined by Dynamic Vessel Analyser (DVA) before and 3 months after a single intravitreal application of bevacizumab (1.25 mg). A baseline measurement was followed by three consecutive monochromatic flicker stimulations (530–600 nm, 12.5 Hz, 20 seconds). Temporal retinal vessel reaction was analysed and compared with the reaction in healthy controls. Results: Mean arterial dilation at the end of flicker was not different in all groups. For veins this parameter amounted to: pre‐treatment, 2.6 (1.7; 3.9)%; post‐treatment, 2.9 (2.4; 4.0)%; control, 4.3 (3.2; 5.7)%; significant: pre‐treatment – control (Dunnett’s procedure, p < 0.05). Maximal dilation occurred in arteries at: pre‐treatment, 17.5 (14.8; 32.5) seconds; post‐treatment, 18.0 (16.6; 30.6) seconds; control, 14.5 (10.8; 17.3) seconds. Both AMD groups were slower (p < 0.05): in veins at 17.0 (14.5; 20.0) seconds, 12.8 (8.6; 14.8) seconds and 18.5 (17.1; 19.9) seconds, respectively; significant post‐treatment – control (p < 0.05). In the post‐treatment AMD group arterial constriction after stimulation occurred more slowly compared with the control group (p < 0.05). Conclusion: Dynamic retinal arterial and venous reactions to flickering light are altered in AMD compared with controls. Three months after a single injection of a vascular endothelial growth factor inhibitor, the investigated retinal dynamic vascular parameters were not altered in our study.