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Abstract #9808 Published in IGR 5-3
Changes in choroidal blood flow during light/dark transitions are not altered by atropine or propranolol in healthy subjects
Fuchsjager Mayrl G; Malec M; Amoako Mensah T; Kolodjaschna J; Schmetterer LVision Research 2003; 43: 2185-2190
It has recently been reported that light/dark transitions lead to changes in choroidal blood flow. Several observations indicate that these changes in choroidal perfusion are triggered at least in part by neural mechanisms. In the present study the authors hypothesized that the choroidal blood flow response to changes in retinal illumination may be modified by either the muscarinic receptor antagonist atropine or by the beta-receptor antagonist propranolol. In 15 healthy subjects the response of choroidal perfusion was studied in a randomized placebo-controlled three way cross-over study using laser Doppler flowmetry and laser interferometric measurement of fundus pulsation amplitude. Before drug administration a transition from light to dark reduced both choroidal hemodynamic parameters by 8-12%. Neither propranolol nor atropine altered basal choroidal blood flow or choroidal blood flow responses to light/dark transitions. These data indicate that neither muscarinic nor beta-receptors are involved in the choroidal blood flow response to changes in retinal illumination. Further studies are required to elucidate which mechanisms contribute to this blood flow behavior of the choroid.
Dr. G. Fuchsjager Mayrl, Department of Clinical Pharmacology, University of Vienna, Wahringer Gurtel 18-20, A-1090, Vienna, Austria
Classification:
6.11 Bloodflow measurements (Part of: 6 Clinical examination methods)
