Intralenticular pressure measurement in intumescent cataract patients

Session Details

Session Title: Cataract Surgery Special Cases

Session Date/Time: Tuesday 25/09/2018 | 08:00-10:00

Paper Time: 08:00

Venue: Room A3, Podium 1

First Author: : E.Pirogova RUSSIA

Co Author(s): :    O. Fabrikantov   S. Nikolashin                 

Abstract Details

Purpose:

To develop the technique of the intralenticular pressure measurement in intumescent cataract and construct a mathematical model for its determination according to the preoperative examination

Setting:

S.N. Fedorov NMRC "MNTK "Eye Microsurgery", Tambov branch, Tambov, Russia

Methods:

The intralenticular pressure was measured intraoperatively in 11 eyes with intumescent cataract. OVD was introduced into the anterior chamber reaching the IOP (P0) up to 30-32 mm Hg. IOP was measured by Maklakov’s tonometer. A needle was used to create the additional paracenthesis and open the anterior capsule. The liquefied lenticular material moved into the anterior chamber. If the fluid stopped releasing soon, the intralenticular pressure was equal to intraocular one; if continued exiting – the additional OVD was introduced to stop releasing the intralenticular material and to level the intraocular and intralenticular pressures

Results:

In correlation analysis of the examined values we revealed the direct statistically significant relationship between the swelling lens thickness and intralenticular pressure value (r=0.650, p=0.030) and the indirect relationship between the swelling lens thickness and anterior chamber depth (r=-0.800, p=0.008). Multiple regression analysis of the intralenticular pressure determinacy showed that its values were correlated with lens thickness, anterior chamber depth and thickness of the anterior layer of liquefied lenticular material (the anterior hypoechogenic layer), determined according to the UBM data. This dependence allowed constructing the mathematical model to measure the preoperative intralenticular pressure

Conclusions:

1. We developed the technique of the intraoperative measurement of intralenticular pressure in patients with intumescent cataract. 2. The mathematical model was constructed to measure the intralenticular pressure using the following values: lens thickness, anterior chamber depth and the value of the anterior layer of liquefied lenticular material, determined during the preoperative UBM diagnosis of intumescent cataract. 3. The preoperative measurement of intralenticular pressure allowed creating the equilibrium pressure gradient in the anterior chamber and inside the lens capsular bag, giving the opportunity to perform intumescent cataract phacoemulsification in a safe manner.

Financial Disclosure:

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