Journal List > J Korean Ophthalmol Soc > v.55(2) > 1009885

Kim, Ko, Sim, and Park: Postural Intraocular Pressure Change at Trendelenberg Position Measured by Rebound Tonometer

Abstract

Purpose

This study was carried out to evaluate the postural intraocular pressure (IOP) change in Trendelenburg, reverse Trendelenburg, and supine positions in healthy young males.

Methods

We measured the IOP values of 5 healthy young male volunteers (10 eyes) using an Icare PRO rebound tonometer in sitting, Trendelenburg, reverse Trendelenburg, and supine positions.

Results

The mean IOP in the supine position (18.63 mm Hg) was significantly higher (p < 0.01) than in the sitting position (15.31 mm Hg). When maintaining the Trendelenburg position, IOP gradually increased.

Conclusions

In our study, the Trendelenburg position significantly increased the IOP compared to that in the supine position. The effects of increased IOP should be considered in situations that require Trendelenburg positioning, such as exercise or surgery.

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Figure 1.
Illustration of experimental positions. Reverse Trend- enlenburg position (T3, 4, 5, 6) (A) and Trendelenburg pos-iton (T8, 9, 10) (B). Red arrow indicates the direction of patient's eyes.
jkos-55-247f1.tif
Figure 2.
Icare PRO rebound tonometer (Icare® PRO; Icare Finland Oy, Helsinki, Finland) Front view (A) and rear view (B) of Icare PRO, (C) display during measuring IOP, (D) display after measuring IOP, showing reliability below IOP. IOP = intraocular pressure.
jkos-55-247f2.tif
Figure 3.
Scatter plot of the IOP with the overlaid line con-necting the mean IOP at each time point. IOP = intraocular pressure; T1 = Sitting; T2 = 10 minutes after supine position; T3 = 10 minutes after reverse Trendelenburg position; T4 = 20 minutes after reverse Trendelenburg position; T5 = 30 minutes after reverse Trendelenburg position; T6 = 60 minutes after reverse Trendelenburg position; T7 = 10 minutes after supine position; T8 = 10 minutes after Trendelenburg position; T9 = 20 minutes after Trendelenburg position; T10 = 30 minutes after Trendelenburg position. * Indicates significant difference compared to T1 (p < 0.05, Tahame’s test). Indicates significant difference compared to T2 (p < 0.05, Tahame’s test). Indicates significant difference between T8 and T10 (p < 0.05, Tahame’s test).
jkos-55-247f3.tif
Table 1.
T1-T10 Time points of measurement and mean intraocular pressure of each time point
Time point Position Intraocular pressure (mm Hg)
T1 Sitting 15.31 ± 0.86
T2 10 minutes after supine position 18.63 ± 1.34
T3 10 minutes after reverse Trendelenburg position 17.81 ± 1.06
T4 20 minutes after reverse Trendelenburg position 17.34 ± 1.03
T5 30 minutes after reverse Trendelenburg position 16.84 ± 0.69
T6 60 minutes after reverse Trendelenburg position 16.43 ± 0.32
T7 10 minutes after supine position 18.15 ± 1.14
T8 10 minutes after Trendelenburg position 23.03 ± 1.21
T9 20 minutes after Trendelenburg position 25.42 ± 1.95
T10 30 minutes after Trendelenburg position 26.36 ± 1.83

Values are presented as mean ± SD.

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