Effects of dopamine on human retinal vessel diameter and its modulation during flicker stimulation

Departments of 1  Clinical Pharmacology, 2  Physiology, and 3  Ophthalmology and the 4  Institute of Medical Physics, University of Vienna Medical School, Vienna A-1090, Austria We performed a randomized, subject-blinded, placebo and time-controlled, two-way crossover study in 12 healthy male subjec...

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Bibliographic Details
Published in:American journal of physiology. Heart and circulatory physiology 2003-01, Vol.284 (1), p.H358-H363
Main Authors: Huemer, Karl-Heinz, Garhofer, Gerhard, Zawinka, Claudia, Golestani, Elisabeth, Litschauer, Brigitte, Schmetterer, Leopold, Dorner, Guido T
Format: Article
Language:English
Subjects:
Adult
Dopamine - administration & dosage
Dopamine - blood
Dopamine - pharmacology
Hemodynamics - drug effects
Humans
Injections, Intravenous
Male
Photic Stimulation - methods
Retinal Vessels - drug effects
Retinal Vessels - physiology
Single-Blind Method
Vasodilation
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Summary:Departments of 1  Clinical Pharmacology, 2  Physiology, and 3  Ophthalmology and the 4  Institute of Medical Physics, University of Vienna Medical School, Vienna A-1090, Austria We performed a randomized, subject-blinded, placebo and time-controlled, two-way crossover study in 12 healthy male subjects. Placebo or dopamine was administered on two separate study days. After saline infusion, dopamine hydrochloride was infused in three consecutive doses (5, 10, and 15 µg · kg 1 · min 1 ). Plasma levels of dopamine were determined at each perfusion step. Arterial and venous retinal vessel diameters were measured with the use of a Zeiss retinal vessel analyzer. Diffuse luminance flicker stimuli of 8 Hz were applied for 60 s. Blood pressure and pulse rate were monitored continuously. Flicker stimulation (8 Hz) increased retinal vessel diameters under basal conditions. The response to 8-Hz flicker light was significantly reduced by dopamine administration. In addition, dopamine slightly but significantly increased retinal vessel diameters. Dopamine hydrochloride significantly increased systolic but not diastolic or mean arterial pressure. The present study indicates that dopamine has a distinct effect on retinal vessel diameters also attenuating the flicker-induced response reactivity of retinal vessels. This implies a role of dopamine in retinal blood flow hemodynamics. retinal vessel analyzer; neurovascular coupling
ISSN:0363-6135
1522-1539
DOI:10.1152/ajpheart.00642.2002