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Seung Youn Jea, Min Ho Son, Tae Min Baek, Joo Eun Lee; Continuous Intraocular Pressure Measurements During Small Incision Phacoemulsification Surgery In Porcine Eyes. Invest. Ophthalmol. Vis. Sci. 2012;53(14):6636.
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© ARVO (1962-2015); The Authors (2016-present)
To determine the change of actual dynamic intraocular pressure(IOP) during small incision phacoemulsification surgery in porcine eyes.
Phacoemulsification through 3.0mm clear corneal incision was done in 30 porcine eyes. Infiniti(Alcon, Fort Worth, Texas, USA) was used for the surgery with bottle height at 95cm or 75cm. A 22-gauge needle, which was connected to a pressure sensor(40PC015G1A, Honeywell, New Jersey, USA) and a data recorder(VR-71, T&D Corporation, Matsumoto, Japan), was inserted into the anterior chamber.
Actual IOP changed continuously throughout the phacoemulsification surgery. The peak IOP and the large IOP fluctuation was observed during emulsification of lens nucleus fragments. IOP was 74.0±8.0mmHg and 57.7±7.7mmHg with bottle height at 95cm and 75cm, respectively. IOP suddenly dropped to 25.1±8.2mmHg (bottle height, 95cm) and 19.2±3.3mmHg(75cm) when surge occurred. This fluctuation was smaller during sculpting procedure (range;43.9±8.3 - 62.1±10.2 mmHg with bottle height at 95cm, and 31.9±6.4 - 51.1±8.1 mmHg with bottle height at 75cm).
IOP range was proportional to the bottle height, and was much higher than normal physiologic IOP range. The peak IOP was seen when complete tip occlusion with lens nuclear fragments was made. Lowering bottle height and avoiding complete occlusion would be needed during phacoemulsification in glaucoma patients.
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