J Korean Ophthalmol Soc.  2015 May;56(5):727-731. 10.3341/jkos.2015.56.5.727.

Correlation between Intraocular Pressure and Bottle Heights during Vitrectomy

Affiliations
  • 1Department of Ophthalmology, Kangwon National University School of Medicine, Chuncheon, Korea. opticus@kangwon.ac.kr

Abstract

PURPOSE
To determine the correlation between intraocular pressure (IOP) and the bottle heights during vitrectomy using TONO-PEN(R)XL applanation tonometer and Icare(R) PRO rebound tonometer.
METHODS
Twenty-four eyes of 24 patients who underwent 23-gauge sutureless vitrectomy were evaluated. After complete vitrectomy, the IOP was gradually increased by lifting the irrigation bottle height from the trocar insertion site by 40 cm, 45 cm, 50 cm, and 55 cm. The distance between the floor and patient's eye was consistent in all cases (105.5 cm). Before the removal of 23-gauge microcannulas, IOP was measured five times using each of the two methods, Tono-Pen(R)XL and Icare(R) PRO.
RESULTS
The mean IOPs were 8.25 +/- 0.35 mm Hg for TONO-PEN(R)XL and 8.96 +/- 0.32 mm Hg for Icare(R) PRO at 40 cm bottle height. As the bottle height increased, the differences in IOP was also increased, 10.71 +/- 0.37 mm Hg at 45 cm, 14.18 +/- 0.39 mm Hg at 50 cm and 17.93 +/- 0.40 mm Hg at 55 cm for TONO-PEN(R)XL and 11.48 +/- 0.31 mm Hg at 45 cm, 14.64 +/- 0.31 mm Hg at 50 cm and 18.13 +/- 0.38 mm Hg at 55 cm for Icare(R) PRO. In TONO-PEN(R)XL, the linear equation was Y = 0.65 X - 18.108 (R2 = 0.794, p = 0.000) and the quadratic equation was Y = 0.013 X2 - 0.569 X + 10.446 (R2 = 0.801, p = 0.000). In Icare(R) PRO, the linear equation was Y = 0.614 X - 15.842 (R2 = 0.820, p = 0.000) and the quadratic equation was Y = 0.010 X2 - 0.306 X + 5.688 (R2 = 0.825, p = 0.000). The results show correlation of the quadratic equation was stronger than the linear equation in both tonometers.
CONCLUSIONS
The differences of IOP were positively correlated with bottle heights in the form of a curve during vitrectomy. Therefore, the patients who are susceptible to retina or optic nerve damage during vitrectomy should be closely monitored.

Keyword

Bottle height; Intraocular pressure; Pars plana vitrectomy

MeSH Terms

Humans
Intraocular Pressure*
Lifting
Optic Nerve
Retina
Surgical Instruments
Vitrectomy*

Figure

  • Figure 1. Scatter plots showing intraocular pressure measurements with TONO-PENⓇ XL (A) and IcareⓇ PRO (B). In, nonlinear regression analysis, the correlation of quadratic equation is more stronger than that of the linear equation. In TONO-PENⓇ XL, the linear equation is Y = 0.65 X - 18.108 (R2 = 0.794, p = 0.000) and the quadratic equation is Y = 0.013 X2 - 0.569 X + 10.446 (R2= 0.801, p = 0.000). In IcareⓇ PRO, the linear equation is Y = 0.614 X - 15.842 (R2 = 0.820, p = 0.000) and the quadratic equation is Y = 0.010 X2 - 0.306 X + 5.688 (R2 = 0.825, p = 0.000). IOP = intraocular pressure.


Reference

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