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Correlation between intraocular pressure and bottle heights during vitrectomy
Author(s) -
Moosang K.
Publication year - 2016
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2016.0243
Subject(s) - medicine , vitrectomy , goldmann applanation tonometer , intraocular pressure , ophthalmology , linear correlation , positive correlation , mathematics , visual acuity , statistics
Purpose To determine the correlation between intraocular pressure (IOP) and the bottle heights during vitrectomy usingTONO‐PEN ® XL applanation tonometer and Icare ® 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, 45, 50, 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 ® XL and Icare ® PRO. Results The mean IOPs were 8.25 ± 0.35 mmHg for TONO‐PEN ® XL and 8.96 ± 0.32 mmHg for Icare ® PRO at 40 cm bottleheight. As the bottle height increased, the differences in IOP was also increased, 10.71 ± 0.37 mmHg at 45 cm, 14.18 ± 0.39 mmHg at 50 cm and 17.93 ± 0.40 mmHg at 55 cm for TONO‐PEN ® XL and 11.48 ± 0.31 mmHg at 45 cm, 14.64 ± 0.31 mmHg at 50 cm and 18.13 ± 0.38 mmHg at 55 cm for Icare ® PRO. In TONO‐PEN ® XL, the linear equation was Y = 0.65 X − 18.108 ( R 2 = 0.794, p = 0.000) and the quadratic equation was Y = 0.013 X 2 − 0.569 X + 10.446 ( R 2 = 0.801, p = 0.000). In Icare ® PRO, the linearequation was Y = 0.614 X − 15.842 ( R 2 = 0.820, p = 0.000) and the quadratic equation was Y = 0.010 X 2 − 0.306 X + 5.688 ( R 2 = 0.825, p = 0.000). The results show correlation of the quadratic equation was stronger than the linear equation in bothtonometers. 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.