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Abstract #18098 Published in IGR 9-2
Retinal blood flow autoregulation after dynamic exercise in healthy young subjects
Iester M; Torre PG; Bricola G; Bagnis A; Calabria GOphthalmologica 2007; 21: 180-185
PURPOSE: To evaluate the retinal blood flow before and after the increase in systemic blood pressure to assess the autoregulation in healthy young subjects. METHODS: Twenty eyes of 20 healthy volunteers were examined. The retinal blood flow was assessed by a Heidelberg retina flowmeter (HRF), while the systemic pressure was assessed by a portable electronic sphygmomanometer. Furthermore intraocular pressure (IOP) was always measured by a Goldmann tonometer immediately after HRF assessments. All measurements of physiological and flow parameters were performed with the subjects seated at rest and then immediately after stair climbing. RESULTS: The IOP decreased significantly after dynamic exercise, while the heart rate and the systemic artery pressure increased significantly. At the baseline, the mean retinal blood flow was 276.8 ± 80.7 arbitrary units (AU) in the superotemporal area, 243.4 ± 63.68 AU in the superonasal area, 258.2 ± 67.37 AU in the inferotemporal area and 243.9 ± 72.24 AU in the inferonasal area. After dynamic exercise the mean retinal blood flow was 249.8 ± 86.78 AU in the superotemporal area, 248.7 ± 63.87 AU in the superonasal area, 245.4 ± 83.85 AU in the inferotemporal area and 228.8 ± 62.53 AU in the inferonasal area. No significant change in retinal blood flow was found. CONCLUSION: Our data support the hypothesis that in normal subjects autoregulation is sufficient to compensate the increase in blood pressure and maintain a stable retinal blood flow after exercise.
Dr. M. Iester, Department of Neurological Sciences, Ophthalmology and Genetics, Clinica Oculistica, University of Genoa, Genoa, Italy. iester@unige.it
Classification:
6.11 Bloodflow measurements (Part of: 6 Clinical examination methods)
