Abstract:
BACKGROUND:Elevation of intraocular pressure in the supine position has been previously described in literature. Aim of this study is to investigate the elevation of intraocular pressure in normal tension glaucoma and its effect on the morphology of the optic disc, visual field function and capillary blood flow of the retina and optic disc. PATIENTS AND METHODS:56 eyes of 28 preperimetric and advanced normal tension glaucoma patients were prospectively evaluated. Ten eyes of ten normal patients served as a control group for the measurements of the intraocular pressure. In the course of a 24-h pressure profile applanation tonometry was performed in the morning in a supine and three and ten minutes later in a sitting position with Draeger's and Goldmann's tonometers. Arterial blood pressure was measured at the same time. The optic disc's morphology was evaluated by stereo photographs and Laser Scanning Tomography. As a sensory test computer perimetry was used. Capillary blood flow was measured at defined areas of the retina and optic disc. An intraocular pressure above 21 mm Hg in the supine position was used as a criterium to define two groups of normal tension glaucoma patients. RESULTS:In the supine position a statistically significant elevation of intraocular pressure was observed in 24 normal tension glaucoma patients by 6.2 +/- 2.8 mm Hg up to 21.8 +/- 3 mm Hg. Diastolic blood pressure in the supine position (80 +/- 10.5 mm Hg) was significantly lower than in the sitting position (94 +/- 11 mm Hg, p = 0.021). 12 of 28 normal tension glaucoma patients showed an intraocular pressure lower than 22 mm Hg in the supine position. In these patients a tendency towards a higher incidence for the occurrence of optic disc haemorrhages and significantly higher values for blood flow (p < 0.0005) and volume (p < 0.005) in the retina and optic nerve head could be shown. In this group of normal pressure glaucoma patients a higher incidence of migraine and vasospastic complaints was reported in the patients' history. CONCLUSION:In this study some normal tension glaucoma patients showed intraocular pressures in the supine position higher than 21 mm Hg and a lower diastolic arterial pressure. The higher incidence of haemorrhages and higher values for flow and volume parameters of the optic disc in normal tension glaucoma patients with an intraocular pressure lower than 22 mm Hg implicate the existence of two entities: real and pseudo normal tension glaucomas.
journal_name
Klin Monbl Augenheilkdjournal_title
Klinische Monatsblatter fur Augenheilkundeauthors
Mardin CY,Jonas J,Michelson G,Jünemann Adoi
10.1055/s-2008-1035128subject
Has Abstractpub_date
1997-10-01 00:00:00pages
235-40issue
4eissn
0023-2165issn
1439-3999journal_volume
211pub_type
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journal_title:Klinische Monatsblatter fur Augenheilkunde
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