TY - JOUR
T1 - Intraocular Pressure Reduction after Phacoemulsification versus Manual Small-Incision Cataract Surgery
T2 - A Randomized Controlled Trial
AU - Sengupta, Sabyasachi
AU - Venkatesh, Rengaraj
AU - Krishnamurthy, Palaniswamy
AU - Nath, Manas
AU - Mashruwala, Abha
AU - Ramulu, Pradeep Y.
AU - Robin, Alan L.
AU - Lee, Paul
N1 - Publisher Copyright:
© 2016 American Academy of Ophthalmology
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - Purpose To compare reduction in intraocular pressure (IOP) and change in anterior chamber angle configuration between eyes undergoing phacoemulsification versus those undergoing manual small-incision cataract surgery (MSICS). Design Prospective, randomized, double-masked, parallel assignment clinical trial. Participants Five hundred eyes of 500 participants 40 to 70 years of age with normal IOP, gonioscopically open angles, and age-related cataract. Methods Eyes underwent phacoemulsification or MSICS after a 1:1 randomization and allocation code. Best-corrected vision, IOP, comprehensive slit-lamp evaluation, and anterior segment (AS) optical coherence tomography (OCT) were performed at baseline and at 1, 3, and 6 months follow-up. Main Outcome Measures Change in IOP (ΔIOP) and AS OCT parameters between baseline and 6 months after surgery. Results Six months, similar IOP reduction was observed in eyes undergoing phacoemulsification (ΔIOP = 2.7±2.9 mmHg) and MSICS (ΔIOP = 2.6±2.6 mmHg; P = 0.70). Widening of the angle opening distance (AOD) 500 μm from the scleral spur (median ΔAOD500 = 103 μm; interquartile range = 39–179 μm) was also similar in both groups (P = 0.28). Multivariate linear regression analysis showed that eyes with higher baseline IOP experienced significantly greater reduction in IOP at 6 months (ΔIOP = 0.46-mmHg reduction for every 1-mmHg increment in baseline IOP; 95% confidence interval [CI], 0.4–0.5 mmHg; P < 0.001). After adjusting for covariates, the magnitude of widening of AOD500 was not associated significantly with reduction in IOP (1.33-mmHg reduction for every 1-mm increment in AOD500; P = 0.07). Baseline AOD500 (β = −0.60-mm change/1-mm increment of baseline AOD; 95% CI, −0.67 to −0.53 mm) and anterior chamber depth (β = 0.07-mm change/1-mm increment of baseline anterior chamber depth; 95% CI, 0.04–0.1 mm) were significant predictors of AOD500 widening at 6 months. Conclusions Both phacoemulsification and MSICS led to significant and similar IOP reductions 6 months after surgery, and both surgeries produced similar changes in anterior chamber and angle parameters. Higher baseline IOP was associated with greater IOP reduction; IOP reduction also can be attributed partly to changes in angle and anterior chamber configuration, although these parameters were unable to predict significantly predict IOP drop at 6 months.
AB - Purpose To compare reduction in intraocular pressure (IOP) and change in anterior chamber angle configuration between eyes undergoing phacoemulsification versus those undergoing manual small-incision cataract surgery (MSICS). Design Prospective, randomized, double-masked, parallel assignment clinical trial. Participants Five hundred eyes of 500 participants 40 to 70 years of age with normal IOP, gonioscopically open angles, and age-related cataract. Methods Eyes underwent phacoemulsification or MSICS after a 1:1 randomization and allocation code. Best-corrected vision, IOP, comprehensive slit-lamp evaluation, and anterior segment (AS) optical coherence tomography (OCT) were performed at baseline and at 1, 3, and 6 months follow-up. Main Outcome Measures Change in IOP (ΔIOP) and AS OCT parameters between baseline and 6 months after surgery. Results Six months, similar IOP reduction was observed in eyes undergoing phacoemulsification (ΔIOP = 2.7±2.9 mmHg) and MSICS (ΔIOP = 2.6±2.6 mmHg; P = 0.70). Widening of the angle opening distance (AOD) 500 μm from the scleral spur (median ΔAOD500 = 103 μm; interquartile range = 39–179 μm) was also similar in both groups (P = 0.28). Multivariate linear regression analysis showed that eyes with higher baseline IOP experienced significantly greater reduction in IOP at 6 months (ΔIOP = 0.46-mmHg reduction for every 1-mmHg increment in baseline IOP; 95% confidence interval [CI], 0.4–0.5 mmHg; P < 0.001). After adjusting for covariates, the magnitude of widening of AOD500 was not associated significantly with reduction in IOP (1.33-mmHg reduction for every 1-mm increment in AOD500; P = 0.07). Baseline AOD500 (β = −0.60-mm change/1-mm increment of baseline AOD; 95% CI, −0.67 to −0.53 mm) and anterior chamber depth (β = 0.07-mm change/1-mm increment of baseline anterior chamber depth; 95% CI, 0.04–0.1 mm) were significant predictors of AOD500 widening at 6 months. Conclusions Both phacoemulsification and MSICS led to significant and similar IOP reductions 6 months after surgery, and both surgeries produced similar changes in anterior chamber and angle parameters. Higher baseline IOP was associated with greater IOP reduction; IOP reduction also can be attributed partly to changes in angle and anterior chamber configuration, although these parameters were unable to predict significantly predict IOP drop at 6 months.
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U2 - 10.1016/j.ophtha.2016.04.014
DO - 10.1016/j.ophtha.2016.04.014
M3 - Article
C2 - 27234929
AN - SCOPUS:84971673160
SN - 0161-6420
VL - 123
SP - 1695
EP - 1703
JO - Ophthalmology
JF - Ophthalmology
IS - 8
ER -