Posters

Aqueous humor PH changes using femtosecond laser-assisted cataract surgery and intracameral mydriatic solution: our experience

Poster Details

First Author: M. Rossi ITALY

Co Author(s):    M. Bordin   F. Di Censo   C. Gandolfi   R. Tassone   M. Al Oum        

Abstract Details

Purpose:

To compare aqueous humor pH values in patients during femtosecond laser-assisted cataract surgery with patients during conventional phacoemulsification and to evaluate the effect of a new intracameral mydriatic solution

Setting:

Vista Monza, Eye Clinic, Monza, Italy

Methods:

30 eyes of 30 patients underwent cataract surgery by asingle surgeon. Group 1 included 15 eyes operated on with a femtosecond platform (Catalys; Abbott Medical Optics, Santa Ana, CA) and Group 2 included 15 eyes that were operated on with conventional phacoemulsification. Tropicamide / phenylephrine hydrochloride / lidocaine hydrochloride 0.2 mg/ml + 3.1 mg/ml + 10 mg/ml solution (mydrane) were used as intracameral mydriatic. Aqueous humor samples (0.10 to 0.15 mL) were collected through a paracentesis from each patient after docking and nucleus fragmentation in Group 1 and after corneal incisions in Group 2, then analyzed with a pH meter.

Results:

We did not have any surgical complication. The mean pH was 6.53 ± 0.09 (range: 6.42 to 6.70) and 7.42 ± 0.07 (range: 7.28 to 7.48) in Group 1 and 2, respectively (P < .001). Intraoperative mydriasis were stable and did not change during surgery in both two groups.

Conclusions:

Photodisruption process in femtosecond laser-assisted cataract surgery lead to an acidic shift of the aqueous humor pH as a result of the transformation of carbon dioxide to carbonic acid. PH shift do not significantly interact with and affect the function of Mydrane. Further analysis of femtosecond laser-assisted cataract surgery and Mydrane are necessary.

Financial Disclosure:

NONE