J Korean Ophthalmol Soc.  2014 Feb;55(2):247-251. 10.3341/jkos.2014.55.2.247.

Postural Intraocular Pressure Change at Trendelenberg Position Measured by Rebound Tonometer

• Kim SK
• Ko JY
• Sim JB
• Park KH

• KMID: 2218418
• DOI: http://doi.org/10.3341/jkos.2014.55.2.247

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.

Keyword

Icare Pro; Intraocular pressure; Reverse Trendelenburg position; Supine position; Trendelenburg position

MeSH Terms

Head-Down Tilt
Humans
Intraocular Pressure*
Iron-Dextran Complex
Male
Supine Position
Volunteers
Iron-Dextran Complex

Figure

• 

  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.

• 

  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.

• 

  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).

Reference

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