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(Investigative Ophthalmology and Visual Science. 2003;44:3947-3951.)
© 2003 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.02-0855
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Effects of Adrenomedullin on Ocular Hemodynamic Parameters in the Choroid and the Ophthalmic Artery

Guido T. Dorner,1,2 Gerhard Garhöfer,1 Karl-Heinz Huemer,1,3 Elisabeth Golestani,1 Claudia Zawinka,1 Leopold Schmetterer,1,4 and Michael Wolzt1

1From the Departments of Clinical Pharmacology, 2Ophthalmology, 3Physiology, and 4Medical Physics, Allgemeines Krankenhaus Vienna, Vienna, Austria.

PURPOSE. Adrenomedullin acts as a vasodilator and may play a role in inflammatory processes in the eye. This study was designed to determine whether nitric oxide formation is involved in the response to adrenomedullin in the ocular vasculature in vivo.

METHODS. The effects of systemic intravenous adrenomedullin (3.2–16.0 pmol/[kg · min])) on choroidal blood flow were assessed by measurement of fundus pulsation amplitude and laser Doppler flow in the macula, and on blood flow in the ophthalmic artery by ultrasound Doppler flow in pilot studies (n = 7). Subsequently, in a double-blind randomized placebo-controlled crossover study in eight healthy male subjects the effects of 12.8 pmol/(kg · min) adrenomedullin on ocular and systemic hemodynamics were investigated. Adrenomedullin was co-infused with the nitric oxide synthase inhibitor NG-monomethyl-L-arginine (3 mg/kg bolus and 30 µg/[kg · min] continuous intravenous infusion) or vehicle control on separate study days.

RESULTS. Adrenomedullin dose dependently increased choroidal blood flow and flow velocity in the ophthalmic artery. NG-monomethyl-L-arginine reduced the effect of adrenomedullin on fundus pulsation amplitude, but did not alter the flow response in the ophthalmic artery. Systemic hemodynamics were unaffected by adrenomedullin infusion.

CONCLUSIONS. Ocular blood flow is sensitive to changes in adrenomedullin concentrations. The acute vasodilator effects of adrenomedullin are nitric oxide-dependent in the choroid, but not in the ophthalmic artery.




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