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Impressum
Measurement of the peripapillary microcirculation in healthy individuals with the Heidelberg Retina Flowmeter (HRF) after hyperhydration (water drinking test)
Menkhaus S., Kuchenbecker J., Wecke T., Behrens-Baumann W.
Otto-von-Guericke-University, Department of Ophthalmology, Leipziger St. 44, D-39120 Magdeburg, Germany
Background: We investigated the influence of hyperhydration (water
drinking test) on peripapillary microcirculation, intraocular pressure
and systemic blood circulation in normal healthy individuals.
Methods: We performed in each case two measurements of the right
eyes of 9 healthy individuals with the Heidelberg Retina Flowmeter (HRT)
before hyperhydration (drinking 1 litre water in 10 minutes) and after
15 min, 30 min, 60 min. The arbitrary units "volume", "flow"
and "velocity" were counted. The measurement was performed in
each case nasal and temporal of the papilla with a 10x10 pixel field.
Furthermore intraocular pressure, blood pressure, pulse and oxygen saturation
were recorded. Changes of all obtained parameters were analyzed for statistical
significance using ANOVA.
Results: The parameters "volume", "flow" and
"velocity" showed temporal a decrease after 15 min and an increase
on maximal values after 30 min. After 60 min the value was similar to
the baseline measurement. Nasal there was a decrease that reached after
30 min its minimum. The following increase revealed lower values after
60 min compared to the baseline measurement, but neither the temporal
nor the nasal measured differences were of statistical significance. Intraocular
pressure showed an significant (p<0,05) increase with a maximum after
30 min (mean difference +2,0 mmHg) and returned to baseline levels after
60 min. The average systolic blood pressure and the oxygen saturation
were almost constant and showed no significant statistical difference.
The pulse was significant lower after 60 min than at the baseline measurement
(mean difference -8,7/min; p<0,05).
Conclusions: The change of the parameters "volume", "flow"
and "velocity" after hyperhydration in 9 normal healthy individuals
was not significant. In future investigations we will evaluate these HRT-parameters
after hyperhydration in patients with primary open angle glaucoma or ocular
hypertension.