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Inverse correlation between endothelin-1-induced peripheral microvascular vasoconstriction and blood pressure in glaucoma patients

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Abstract

• Background: The potent vasoconstrictor peptide endothelin-I has been shown to participate in the control of peripheral vascular tone and in the regulation of ocular perfusion. In glaucoma patients vasospasms and arterial hypotension have been identified as risk factors for the progression of glaucomatous damage, and the regulation of endothelin-1 release is disturbed in some of these patients. The aim of this study was to assess the relationship between resting blood pressure and cutaneous vascular responsiveness to endothelin-1 and phenylephrine in patients with glaucoma and in matched controls. • Methods: In 9 patients with primary open-angle glaucoma (POAG), 7 patient with normal tension glaucoma (NTG), and 16 age- and sex-matched controls, endothelin-1 and phenylephrine responses were assessed in the human forearm microcirculation using laser Doppler flowmetry during intra-arterial drug administration. Blood pressure was measured intra-arterially. • Results: In contrast to α1-adrenergic effects, endothelin-1 responses were inversely correlated to both systolic (r 2 = 0.27,P = 0.05) and diastolic (r 2 = 0.54,P = 0.001) blood pressure in glaucoma patients, whereas there was no such correlation in controls. Patients with lower blood pressure values were more sensitive to the vasoconstrictor effects of endothelin-1. Cutaneous responsiveness to endothelin-1 and phenylephrine was similar in glaucoma patients and in controls. • Conclusion: These results reveal that glaucoma patients appear to have peripheral microvascular abnormalities which are exhibited as altered responsiveness to endothelin-1. Thus, this study supports the hypothesis that endothelin-l-related microvascular dysfunction may be involved in the pathogenesis of glaucomatous damage.

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Authors and Affiliations

  1. Department of Ophthalmology, University of Basel, Switzerland

    Andreas Gass & Josef Flammer

  2. Division of Clinical Pharmacology, Department of Medicine, University Hospital, CH-4031, Basel, Switzerland

    Lilly Linder, Silvana C. Romerio & Walter E. Haefeli

  3. Department of Pharmacy, University of Basel, Switzerland

    Lilly Linder & Walter E. Haefeli

  4. Medical Outpatient Department, University Hospital, CH-4031, Basel, Switzerland

    Paul Gasser

Authors
  1. Andreas Gass
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  2. Josef Flammer
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  3. Lilly Linder
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  4. Silvana C. Romerio
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  5. Paul Gasser
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  6. Walter E. Haefeli
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Correspondence to Walter E. Haefeli.

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Gass, A., Flammer, J., Linder, L. et al. Inverse correlation between endothelin-1-induced peripheral microvascular vasoconstriction and blood pressure in glaucoma patients. Graefe's Arch Clin Exp Ophthalmol 235, 634–638 (1997). https://doi.org/10.1007/BF00946939

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  • DOI: https://doi.org/10.1007/BF00946939

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