Effect of 0.1% Bromfenac for Preventing Macular Edema after Cataract Surgery in Patients with Diabetes

Seok Hyeon Song; Seung Kook Baek; Min Woo Lee; Young Hoon Lee

doi:10.3341/kjo.2019.0044

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Song, Baek, Lee, and Lee: Effect of 0.1% Bromfenac for Preventing Macular Edema after Cataract Surgery in Patients with Diabetes

Original Article

Korean Journal of Ophthalmology 2020; 34(1): 46-55.

Published online: 4 February 2020

DOI: https://doi.org/10.3341/kjo.2019.0044

Effect of 0.1% Bromfenac for Preventing Macular Edema after Cataract Surgery in Patients with Diabetes

Seok Hyeon Song, Seung Kook Baek, Min Woo Lee, Young Hoon Lee

Department of Ophthalmology, Konyang University College of Medicine, Daejeon, Korea.

Corresponding Author: Young Hoon Lee, MD. Department of Ophthalmology, Konyang University College of Medicine, 158 Gwanjeodong-ro, Seo-gu, Daejeon 35365, Korea. Tel: 82-10-3410-0329, Fax: 82-42-600-9176, astrix001@kyuh.ac.kr

Received 19 April 2019 Revised 30 September 2019 Accepted 8 October 2019

The Korean Ophthalmological Society

(open-access):

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To investigate the effect of 0.1% bromfenac sodium hydrate ophthalmic solution for prevention of macular edema after cataract surgery in patients with diabetes.

Methods

A retrospective analysis of 75 patients with diabetes who underwent cataract surgery was performed. Thirty-eight patients (52 eyes) were instilled with 0.1% bromfenac solution (bromfenac group) and 37 patients (46 eyes) were not (control group).

Results

There were no significant preoperative between-group differences. Compared to the control group, at 1 month after surgery, the bromfenac group showed slightly better best-corrected visual acuity (0.12 ± 0.12 vs. 0.32 ± 0.42, p = 0.142), lower central macular thickness (265.58 ± 31.28 vs. 314.15 ± 76.11 µm, p < 0.001), and lower macular volume (8.46 ± 0.60 vs. 9.14 ± 1.53 mm³, p = 0.022). There were no significant differences between the two groups at 4 and 6 months postoperatively (p > 0.05). Mean changes in central macular thickness showed significant differences at 1 and 4 months postoperatively (−1.44 ± 11.72 and 10.44 ± 22.48 µm in bromfenac group vs. 47.19 ± 70.24 and 31.69 ± 48.04 µm in control group, p < 0.001 and p = 0.016) and mean changes in macular volume showed a significant difference at 1 month postoperatively (−0.08 ± 0.47 mm³ in bromfenac group vs. 0.58 ± 1.28 mm³ in control group, p < 0.001). There were no significant differences thereafter (p > 0.05).

Conclusions

Treatment with 0.1% bromfenac sodium hydrate ophthalmic solution showed good efficacy for preventing cystoid macular edema early after cataract surgery in patients with diabetes.

Keywords: Bromfenac, Cataract, Diabetes mellitus, Macular edema, Nonsteroidal anti-inflammatory agents

Postoperative macular edema is a major cause of impaired vision following cataract surgery. Macular edema usually develops 4 to 6 weeks after surgery in 1% to 4% of patients [1 2 3]. Although the etiology of postoperative macular edema is unclear, it is thought that inf lammation caused by manipulation of intraocular structures during surgery increases prostaglandin synthesis, which in turn increases retinal vascular permeability [4 5 6 7]. Diabetes, hypertension, old age, uveitis, and retinal vein occlusions are risk factors for macular edema that weaken the retinal vascular walls. In particular, diabetes-related factors such as severity of diabetic retinopathy are related to the development of macular edema following cataract surgery [8 9]. The most common treatments for macular edema after cataract surgery are corticosteroids, nonsteroidal anti-inflammatory drugs (NSAIDs), carbonic anhydrase inhibitors, and anti-vascular endothelial growth factor agents; these drugs are topics of many ongoing studies [5].

NSAIDs inhibit cyclo-oxygenase (COX) and therefore decrease inflammation by blocking prostaglandin synthesis [10 11 12]. NSAIDs are used to treat allergic conjunctivitis and scleritis and are effective for maintaining mydriasis during surgery, alleviating postoperative pain, controlling inflammation, and preventing macular edema when used before and after cataract surgery [13 14 15 16 17]. Koh and Chung [18] reported that the use of pranoprofen ophthalmic solution after cataract surgery in patients with diabetes significantly limited increases in central macular thickness (CMT) and macular volume (MV), thereby preventing macular edema. Chun et al. [19] reported that use of topical diclofenac and pranoprofen prevented postoperative macular edema in a cohort of patients without diabetes. Additionally, intravitreal injection of anti-vascular endothelial growth factor agents used together with topical NSAIDs decreased macular edema in retinal vein occlusion, diabetic retinopathy, and age-related macular degeneration [20 21 22 23]. A body of literature indicates that, compared to steroid ophthalmic solutions, NSAIDs are more effective for preventing inflammation and macular edema following cataract surgery. In addition, NSAIDs are associated with lower rates of steroid-related side effects such as increased intraocular pressure (IOP), infection, and delayed corneal epithelial wound healing [3 16 17 20 21 22 23 24 25 26 27 28 29 30 31].

The most common NSAID ophthalmic solutions used in South Korea are 0.1% diclofenac sodium, 0.45% ketorolac tromethamine, 0.1% pranoprofen, and 0.1% bromfenac. Jeong et al. [32] compared the utility of 1% prednisolone and 0.1% bromfenac for preventing cystoid macular edema following cataract surgery and reported no significant difference in efficacy. In addition, there were a number of studies comparing the efficacy of preventing macular edema between NSAID ophthalmic solutions and comparing NSAID ophthalmic solution versus steroid ophthalmic solution for preventing macular edema after cataract surgery. A number of studies have shown that NSAID ophthalmic solution can help prevent macular edema after cataract surgery. However, there has been no report on using bromfenac for prevention of macular edema after cataract surgery in Korean patients with diabetes.

We studied the preventive effect of 0.1% bromfenac sodium hydrate ophthalmic solution on macular edema after cataract surgery in patients with diabetes by analyzing effects on best-corrected visual acuity (BCVA), CMT, and MV.

Materials and Methods

A retrospective cohort study was conducted. The study protocol adhered to the tenets of the Declaration of Helsinki and was approved by the institutional review board of Konyang University Hospital of Korea (2019-04-010). Informed consent was waived due to the retrospective nature of the study. The study included 98 eyes from 75 patients with diabetes who underwent cataract surgery from December 2015 to February 2017 and were followed-up for more than 6 months. All patients underwent a comprehensive ophthalmic examination, including review of their medical history, visual acuity testing, slit-lamp examination, IOP measurement, and dilated funduscopic examination. Optical coherence tomography (OCT) was conducted using Heidelberg Spectralis (Heidelberg Engineering, Heidelberg, Germany) prior to surgery. The exclusion criteria included preoperative CMT >300 µm, glaucoma, retinal diseases other than diabetic retinopathy, and history of prior intraocular surgery or intravitreal injection.

The severity of diabetic retinopathy was classified by a single ophthalmologist as ”no diabetic retinopathy,“ ”non-proliferative diabetic retinopathy (NPDR),“ or ”proliferative diabetic retinopathy (PDR)“ as per the Early Treatment Diabetic Retinopathy Study criteria. Ophthalmic examinations were performed at 1 day, 1 week, 1 month, 4 months, and 6 months postoperatively to regularly monitor BCVA and IOP. OCT was conducted at 1, 4, and 6 months postoperatively to compare to pre- and postoperative CMT and MV values. CMT was defined as the average value of macular thickness < 1.0 mm in diameter with the foveal centralis at the center. BCVA was measured using the Snellen chart and was converted to logarithm of minimum angle of resolution (logMAR) visual acuity for analysis. IOP was measured using a Goldmann applanation tonometer.

All surgeries were performed by the same surgeon after retrobulbar and nadbath anesthesia using 2% lidocaine. A clear corneal incision of approximately 2.75 mm was made at 11 o'clock, and the anterior chamber was stabilized with 1% sodium hyaluronate (Microvisc; Bohus Bio Tech AB, Stromstad, Sweden) to protect the corneal endothelium during surgery. A 5.5-mm continuous curvilinear capsulorhexis was performed using a cystotome and capsulorhexis forceps. After phacoemulsification using a Constellation vision system (Alcon, Fort Worth, TX, USA), a one-piece aspheric foldable soft artificial prosthetic intraocular lens (Tecnis ZCB00; Abbott Medical Optics, Santa Ana, CA, USA) was implanted into the posterior chamber.

In the bromfenac group, 0.1% bromfenac sodium hydrate ophthalmic solution (Bronuck; Taejoon, Seoul, Korea) was applied twice daily from 3 days before cataract surgery to 1 month postoperatively. Both groups applied levofloxacin ophthalmic solution (Cravit; Santen, Osaka, Japan) four times daily for 3 days before cataract surgery. After surgery, both groups applied moxifloxacin (Vigamox, Alcon) and 1% prednisolone acetate ophthalmic solution (Predforte; Allergan, Irvine, CA, USA) four times daily for 1 week followed by levofloxacin and 0.1% fluorometholone ophthalmic solution (Fluorometholone, Taejoon) for 3 weeks.

Statistical analyses were performed using PASW Statistics ver. 18.0 (SPSS Inc., Chicago, IL, USA). Pearson's chisquared tests and Mann-Whitney U-tests were used for between-group comparisons. Wilcoxon signed-rank tests were used to compare preoperative and postoperative values within each group. In all cases, the threshold for significance was p < 0.05.

Results

Of 98 eyes from 75 patients with diabetes, 52 eyes (38 patients) were assigned to the bromfenac group and 46 eyes (37 patients) were assigned to the control group. There were no significant between-group differences in terms of age, sex, duration of diabetes mellitus, hemoglobin A1C within 2 months before surgery, severity of preoperative diabetic retinopathy, or history of panretinal photocoagulation laser treatment. Similarly, there were no significant differences in preoperative BCVA (logMAR), CMT, or MV between groups (Table 1).

Visual outcomes

Both groups showed improvements in mean BCVA at 1, 4, and 6 months postoperatively compared to preoperative status (p < 0.001). At 1 month postoperatively, mean BCVA was 0.12 ± 0.12 in the bromfenac group and 0.32 ± 0.42 in the control group. Although the bromfenac group showed better BCVA than the control group, this difference was not statistically significant (p = 0.142). At 4 and 6 months postoperatively, mean BCVA was 0.15 ± 0.12 and 0.16 ± 0.12 in the bromfenac group, whereas it was 0.28 ± 0.36 and 0.25 ± 0.35 in the control group (p = 0.305 and 0.824) (Table 2 and Fig. 1).

Anatomic outcomes

Mean CMT in the bromfenac group was 265.58 ± 31.28, 276.88 ± 35.96, and 270.15 ± 38.79 µm at 1, 4, and 6 months, respectively, while in the control group it was 314.15 ± 76.11, 298.65 ± 49.50, and 283.62 ± 32.75 µm, respectively. In the bromfenac group, there was no significant difference in CMT between preoperative status and at 1 and 6 months postoperatively (p = 0.52 and 0.089), but there was a significant increase at 4 months compared to the preoperative status (p = 0.001). In the control group, there were significant increases in CMT between preoperative status and at 1, 4, and 6 months postoperatively (p < 0.001, 0.002, and 0.012). Additionally, there were significant between- group differences in CMT at 1 month postoperatively (p < 0.001), but not at 4 or 6 months postoperatively (p = 0.126 and 0.105). Mean changes in CMT in the bromfenac group were -1.44 ± 11.72, 10.44 ± 22.48, and 3.70 ± 24.13 µm at 1, 4, and 6 months postoperatively, respectively, while those in the control group were 47.19 ± 70.24, 31.69 ± 48.04, and 16.65 ± 38.59 µm, respectively. There were significant between-group differences in mean change at 1 (p < 0.001) and 4 months postoperatively (p = 0.016), but there was no significant difference at 6 months postoperatively (p = 0.053) (Table 2 and Fig. 2A, 2B).

MV showed similar trends to CMT. Mean MVs in the bromfenac group were 8.46 ± 0.60, 8.72 ± 0.85, and 8.62 ± 0.64 mm³ at 1, 4, and 6 months postoperatively, respectively, while those in the control group were 9.14 ± 1.53, 9.30 ± 1.84, and 9.08 ± 1.61 mm³, respectively. In the bromfenac group, there was no significant difference in MV between preoperative status and 1 month postoperatively (p = 0.421), but there was a significant increase at 4 and 6 months postoperatively compared to preoperative status (p = 0.009 and 0.015). In the control group, there were significant increases in MV between preoperative status and status at 1, 4, and 6 months postoperatively (p = 0.006, 0.011, and 0.083). Mean changes in MV in the bromfenac group were −0.08 ± 0.47, 0.19 ± 0.64, and 0.08 ± 0.52 mm³ at 1, 4, and 6 months postoperatively, respectively, while those in the control group were 0.58 ± 1.28, 0.73 ± 1.58, and 0.52 ± 1.46 mm³, respectively. There were significant between-group differences in mean change at 1 month postoperatively (p < 0.001) (Table 2 and Fig. 3A, 3B).

There were eight eyes (15.4%) with CMT >300 µm in the bromfenac group and 15 eyes (32.6%) with CMT >300 µm in the control group during follow-up. Only one eye in the control group exhibited an increase in CMT >150 µm compared to preoperative status. The patient's BCVA (log-MAR) was 1.30 at 1 month postoperatively and showed immediate improvement after treatment with intravitreal bevacizumab injection to 0.30. The patient's BCVA was then 0.20 at 3 months after injection (4 months postoperatively). There were no significant between-group differences in IOP at 1 day, 1 week, 1 month, 4 months, or 6 months postoperatively (p > 0.05).

Analysis by severity of diabetic retinopathy

In patients without diabetic retinopathy, mean change in CMT was significantly smaller in the bromfenac group than in the control group at 1 month postoperatively (p = 0.038), but not mean change in MV (p = 0.571). There were no significant between-group differences in mean change in CMT or MV at 4 and 6 months postoperatively. In patients with NPDR, mean changes in CMT and MV were significantly smaller in the bromfenac group than in the control group at 1 month postoperatively (p = 0.014, 0.043, respectively), but not at 4 months postoperatively. At 6 months postoperatively, there was a significant between-group dif ference in mean change in CMT (p = 0.034), but not in MV (p = 0.196). In patients with PDR, mean changes in CMT and MV were not significantly different between the two groups (Table 3). Serious bromfenac-associated complications such as toxic keratopathy, corneal perforation, corneal melting, or corneal ulceration were not identified. In addition, subjective irritation or discomfort were not identified.

Discussion

Previous studies have associated the presence of diabetes mellitus and severity of diabetic retinopathy with macular edema after cataract surgery. Accordingly, patients with diabetes have an increased risk of macular edema due to weak retinal vascular walls [8 9 33]. Macular edema can be diagnosed on OCT and fluorescein angiography. While conventional fluorescence angiography is invasive, OCT is a non-invasive technique that images the retinal layer structure and quantifies retinal thickness and volume in a highly reproducible manner [2 9 34].

Several studies have reported the incidence of macular edema after cataract surgery. The previously reported incidence of cystoid macular edema affecting visual acuity is 1% to 4% [2 3]. The present study only identified decreased visual acuity and macular edema with CMT exceeding 300 µm in 1 eye at 1 month postoperatively, consistent with an incidence of 1.02% (1 / 98).

Prostaglandin, which is produced during inflammatory reactions, is an inflammatory mediator that causes vasodilation, increased vascular permeability, destruction of the retinal vascular wall, pain, and miosis [35]. NSAIDs are COX inhibitors that inhibit synthesis of prostaglandin. Accordingly, NSAIDs have anti-inflammatory, antipyretic, analgesic, and anticoagulant effects; they are used to treat allergic conjunctivitis, scleritis, uveitis, mydriasis during cataract surgery, postoperative pain, and inflammation, as well as to prevent macular edema when taken before and after cataract surgery [10 11 12 13 14 15 16 17]. COX-1 and COX-2 are involved in prostaglandin synthesis, and COX-2 is the main mediator of inflammatory responses in the eye. Bromfenac is more selective for COX-2 than COX-1, whereas NSAID ophthalmic solutions such as pranoprofen, diclofenac, ketorolac, nepafenac, and amfenac act on both COX-1 and COX-2. Bromfenac has a half-maximal inhibitory concentration of 0.0066–0.0075 µmol/L for COX-2, which is 3 to 4 times more selective for COX-2 than other NSAIDs. Bromine present in the chemical structure of bromfenac enhances the lipophilicity of the molecule and facilitates its penetration into the cornea, vitreous fluid, and intraocular tissue; another study demonstrated that bromination at the four position of the phenyl ring increased the duration of the compound's analgesic and anti-inflammatory activity [7 35 36 37 38 39 40 41]. Kida et al. [42] demonstrated that bromfenac is superior to diclofenac, nepafenac, and amefenac for penetration into retinochoroidal tissues, and Baklayan et al. [43] reported that bromfenac penetrates deeper and persists longer in the retina than nefapenac. Because of these structural features, bromfenac has high penetration into intraocular tissues and a longer duration compared to other NSAID ophthalmic solutions–may result in faster and more potent anti-inflammatory and analgesic effects and better macular edema prevention than other NSAID ophthalmic solutions. Compared with other NSAID ophthalmic solutions, bromfenac can improve a patient's compliance by reducing the number of drops to twice a day with a comfortable sensation.

Previous studies have indicated that the use of NSAIDs alone or in combination with a steroid ophthalmic solution is more effective for preventing macular edema after cataract surgery than use of a steroid ophthalmic solution alone. Moreover, studies suggest that use of a steroid ophthalmic solution alone after cataract surgery is insufficient to prevent macular edema in patients with diabetes and should be supplemented with NSAIDs [3 16 17 24 25 26 27 28 29 30 31]. Endo et al. [44] reported that bromfenac was more effective for managing inflammation and changes in perifoveal thickness after cataract surgery than steroids in patients with non-proliferative diabetic retinopathy, a high-risk group for cystoid macular edema. In the present study, clinical outcome of diabetic retinopathy according to severity was significantly reduced in patients with NPDR who were treated with bromfenac at 1 month postoperatively. However, there was no difference in the PDR group, similar to results of a previous study [44].

This study demonstrated the utility of 0.1% bromfenac sodium hydrate ophthalmic solution for preventing macular edema, as indicated by changes in CMT and MV after cataract surgery in patients with diabetes. At 1 month postoperatively, CMT and MV were significantly lower in the bromfenac group than in the control group; moreover, changes between preoperative status and 1 month were also lower in the bromfenac group. While the bromfenac group did not show any significant changes from preoperative status at 1 month, the control group exhibited significant increases in CMT and MV, suggesting an increased likelihood of developing macular edema in the control group. At 4 and 6 months after surgery, the groups were equivalent in terms of BCVA, CMT, and MV; yet, both groups showed significant increases in CMT and MV compared to preoperative status. These observations are consistent with those of Kim et al. [45], who reported that prophylactic NSAIDs decrease the incidence of cystoid macular edema and accelerate recovery from cystoid macular edema as well as visual acuity within 3 months postoperatively, but do not affect macular thickness or visual acuity beyond 3 months postoperatively. In the present study, bromfenac was applied for 1 month postoperatively; thus, macular edema may have been promoted by weak vascular retinal walls due to diabetes.

Side effects associated with ophthalmic NSAIDs include temporary stinging, burning sensation, conjunctival hyperemia, toxic keratopathy, corneal perforation, corneal melting, and corneal ulceration [46 47]. Serious corneal complications such as toxic keratopathy, corneal perforation, and corneal melting have been reported but are very rare. We did not observe any serious complications in this study; however, NSAIDs should be used carefully in patients with corneal injury or underlying corneal disease.

The present study had some limitations. First, this study was retrospective in design. Given a limited number of subjects and short follow-up period, it was difficult to compare long-term visual prognoses or the incidence of macular edema between the bromfenac group and control group. Therefore, future long-term prospective studies are necessary to investigate whether there is a difference in long-term visual prognosis and incidence of macular edema according to duration and type of ophthalmic solution use. In addition, bromfenac was used for only one month after surgery in this study. The effect of prolonged use of bromfenac should be investigated in subsequent studies. Analysis was grouped into no diabetic retinopathy, NPDR, and PDR, but the limited number of subjects in each subgroup was insufficient to analyze the results. Further studies in more subjects are needed to investigate the effect of bromfenac on diabetic retinopathy severity.

Nonetheless, this study was the first to report the preventive effect of bromfenac on macular edema after cataract surgery in diabetic patients in Korea. This is the first study to independently evaluate the effect of 0.1% bromfenac on CMT and MV after cataract surgery in diabetic patients. Our findings suggest that 0.1% bromfenac is safe and effective for preventing macular edema early after cataract surgery in patients with diabetes in Korea. Moreover, it may increase postoperative satisfaction and reduce anxiety regarding the possibility of pseudophakic CME.

Figures and Tables

Fig. 1

Between-group comparison of best-corrected visual acuity (BCVA). logMAR = logarithm of the minimum angle of resolution.

Fig. 2

Between-group comparison of (A) mean central macular thickness (CMT) and (B) mean change in CMT from preoperative status between two groups over time (p < 0.05, Mann-Whitney U-test).

Fig. 3

Between-group comparison of (A) macular volume (MV) and (B) mean change in MV from preoperative status (p < 0.05, Mann-Whitney U-test).

Table 1

Patient demographics and preoperative clinical characteristics

Values are presented as mean ± standard deviation or number (%).

BCVA = best-corrected visual acuity; logMAR = logarithm of the minimum angle of resolution; IOP = intraocular pressure; CMT = central macular thickness; MV = macular volume; DM = diabetes mellitus; NDR = no diabetic retinopathy; NPDR = non-proliferative diabetic retinopathy; PDR = proliferative diabetic retinopathy.

^*Mann Whitney U-test; ^†Pearson's chi-squared test.

Table 2

Between-group comparisons of postoperative clinical outcomes

Values are presented as mean ± standard deviation.

BCVA = best-corrected visual acuity; logMAR = logarithm of the minimum angle of resolution; POD = postoperative day; CMT = central macular thickness; MV = macular volume.

^*Mann-Whitney U-test.

Table 3

Between-group comparisons of postoperative clinical outcomes according to severity of diabetic retinopathy

Values are presented as mean ± standard deviation unless otherwise indicated.

CMT = central macular thickness; NDR = no diabetic retinopathy; NPDR = non-proliferative diabetic retinopathy; PDR = proliferative diabetic retinopathy; MV = macular volume; POD = postoperative day.

^*Mann-Whitney U-test.

Notes

^{Conflict of Interest} No potential conflict of interest relevant to this article was reported.

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