How Many Fenestrations Should I Make When Placing a Baerveldt Glaucoma Implant? A Laboratory Study.

DISCUSSION The salient findings of our study are as follows: (1) at a simulated intraocular pressure of 50 mmHg, there is a statistically significant difference in total volume of egressed fluid from the silicone tube with one versus two fenestration(s); (2) there is no significant difference if simulated IOP is 40 mmHg or less (the 40 mmHg group was very close to being statistically significant with a P -value of 0.08); (3) in the opening pressure trials, the second fenestration opened at a pressure of 28.83 ± 5.09 mmHg.

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In the 40-mmHg trial, a single fenestration resulted in a mean fluid egress of 213.75 μL, two fenestrations 293.75 μL; not significantly different with a P -value of 0.08, but notably trending toward significance.

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