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Heritability of the Effect of Corticosteroids on Intraocular Pressure

Published online by Cambridge University Press:  01 August 2014

F.H. Reuling  and
J.T. Schwartz
F.H. Reuling*
Affiliation:
Section on Ophthalmic Field and Developmental Research, Epidemiology Branch, National Institute of Neurological Diseases and Stroke, NIH, Bethesda, Md.
J.T. Schwartz
Affiliation:
Section on Ophthalmic Field and Developmental Research, Epidemiology Branch, National Institute of Neurological Diseases and Stroke, NIH, Bethesda, Md.
*
Section on Ophthalmic Field and Developmental Research, NIH, Bethesda, Md. 20014, USA

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In the late 1950's and early 1960's, it became evident that some glaucoma patients developed elevations of intraocular pressure, which were difficult to control, following prolonged use of systemic or ocular medications containing corticosteroids (Chandler, 1955, Alfano, 1963; Armaly, 1963). In addition, some patients without glaucoma, when treated with steroids for long periods of time, developed clinical signs of chronic simple glaucoma (McLean, 1950; François, 1954; Covell, 1958; Linner, 1959; Goldman, 1962). Fortunately, the elevation of intraocular pressure was reversible if the drug was discontinued.

Over the past decade, extensive investigation of the “steroid response” has been undertaken. For this presentation, the steroid response may be considered as a gradual elevation of intraocular pressure, occurring over several weeks, in an eye being medicated with corticosteroid drops several times a day. The elevation in pressure is usually accompanied by a reduction in the facility of aqueous outflow. When relatively large numbers of subjects were tested with topical steroids, so that a wide range of responsiveness could be observed, a variation in individual sensitivity was demonstrated. Frequency distributions of intraocular pressure or change in pressure following steroids showed a skew toward the high side. On the basis of trimodal characteristics which they observed in such frequency distributions, Becker and Hahn (1964), Becker (1965) and Armaly (1965, 1966) considered the possible existence of several genetically determined subpopulations. These investigators distinguished three subpopulations on the basis of low, intermediate, and high levels of pressure response. It was hypothesized that these levels of response characterized three phenotypes, corresponding to the three possible genotypes of an allele pair, wherein one member of the pair determined a low level of response, and the other member determined a high level of response (Armaly, 1967).

Type
Session 15 - Twins in Medical Genetics
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 19 , Issue 1-2 , April 1970 , pp. 264 - 267
Copyright
Copyright © The International Society for Twin Studies 1970

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