TY - JOUR
AU - Kaido, Minako
AB - Introduction Tear film instability, in which an imbalance in the ocular surface tear film deteriorates its stability and regularity, is an important cause of dry eye (DE). The P2Y2 receptor agonist diquafosol tetrasodium (DQS) was developed as an eye drop to improve tear film stability by stimulating tear and mucin secretion [1, 2]. The introduction of this ophthalmic solution has led to significant changes in treatment strategies for patients with DE. Many reports have shown the efficacy of DQS ophthalmic solutions in improving corneal staining, stabilizing tear fluid film, and relieving DE symptoms [3–6]. As P2Y2 receptors are also present in meibomian glands, a DQS-induced increase in the lipid layer has been reported in several studies [7–12]. DQS comprehensively targets the aqueous, mucin, and lipid layers. However, DQS ophthalmic solutions must be applied six times per day to keep the ocular surface moist, which reduces patient compliance. Uchino et al. reported that only 10.2% of participants applied eye drops at the frequency described in the package insert [13]. Recently, a new long-acting formulation of DQS ophthalmic solution (DQS-LX) was developed [14] through the addition of polyvinylpyrrolidone (PVP), which reduced the required frequency of eye drops to three times a day. While several patients who were prescribed DQS switched to DQS-LX, some preferred DQS [15, 16]. Previous studies have reported changes in subjective symptoms, fluorescein tear film breakup time (FBUT), and fluorescein staining findings after switching from DQS to DQS-LX [15, 16]. However, no comprehensive studies have investigated ocular surface parameters, including meibomian gland-related parameters and allergic conjunctivitis-related complications. Therefore, we aimed to compare ocular surface parameters, including the meibomian gland findings, related to the parameters and condition of the tarsal conjunctiva, to identify differences between patients who were on conventional DQS and switched to DQS-LX, those who were satisfied with DQS-LX and wished to continue DQS-LX, and those who wished to revert to DQS. Materials and methods This retrospective cohort study was approved by the Institutional Review Board of the Itoh Clinic and adhered to the tenets of the Declaration of Helsinki (Registration ID: IRIN2023-0909). Informed consent was obtained from all the participants. This study was registered with the University Hospital Medical Information Network (Registration ID: UMIN000054378). Data were accessed for research purposes between October 2 and October 30, 2023, after Ethics Committee approval. There was no contact with patients or legal guardians as all data was obtained by study investigators through patient identification numbers on the electronic health system and subsequently fully anonymized to ensure patient confidentiality. Participants This study included 341 patients with DE (62.1 ± 11.7 years) treated at the Itoh Clinic between November 8, 2022, and July 31, 2023 who switched from DQS to DQS-LX. Data of those who continued DQS-LX for at least 1 month (DQS-LX group) and those who wished to revert to conventional DQS within 3 months (DQS group) were retrospectively compared. Patients using eye drops or oral medications other than DQS were included in the current study, and other treatments remained unchanged, except for the switchover from DQS to DQS-LX. Only left eyes of the patients were included in this study. Patients who had used DQS for less than 3 months, used DQS-LX for less than 1 month, had punctal plugs, wore contact lenses, used anti-glaucoma eye drops, undergone eye surgery within 3 months, and could not provide consent were excluded. Clinical assessment Clinical assessment items were measured at the time of the DQS-LX switchover. Symptoms were assessed using the Standard Patient Evaluation of Eye Dryness (SPEED) validated questionnaire (scale, 0–28) [17]. Tear meniscus height (TMH) was quantitatively measured using an IDRA instrument (SBM Sistemi, Torino, Italy) [18, 19]. Lid margin abnormalities (plugging of the meibomian gland orifices and vascularity of lid margins) [20], FBUT, corneal and conjunctival fluorescein staining (CFS) [21], and meibum grade (0–3) [22] were evaluated using slit-lamp microscopy. FBUT was measured after instilling 1 μl of preservative-free 1% sodium fluorescein into the conjunctival sac using a micropipette. CFS was scored on a scale of 0–9 points as previously described [21]. Conjunctival hyperemia and papillae were observed. Morphological changes in the meibomian glands were assessed based on the meiboscore (0–6) [23] as determined by noninvasive meibography. Tear fluid production was measured using Schirmer’s test without anesthesia [24]. Statistical analysis Data are presented as means ± standard deviation (SD). The Shapiro–Wilk test revealed the non-normal distribution of the data (P < 0.05); thus, nonparametric tests were used. The Fisher’s exact test was used to compare categorical variables between the DQS and DQS-LX groups. The Mann–Whitney U test was used to compare continuous variables between the two groups. We performed a post-hoc power analysis for the SPEED score, TMH, and FBUT. For the SPEED score, the mean difference between the two groups was 3.8, with a corresponding SD of 6.2; for the TMH, the mean difference was 0.04 with an SD of 0.05; and for the FBUT, the mean difference was 0.56 with an SD of 1.29. These changes were calculated using the data from 48 eyes of 48 patients. The power (1 − β) was > 0.8 at the level of α = 0.05 for the SPEED score, TMH, and FBUT, and the sample size of this study was sufficient. Statistical analyses were performed using JMP Pro version 17 software (SAS, Cary, NC, USA). All statistical tests were two-sided, and a P-value < 0.05 was considered statistically significant. Participants This study included 341 patients with DE (62.1 ± 11.7 years) treated at the Itoh Clinic between November 8, 2022, and July 31, 2023 who switched from DQS to DQS-LX. Data of those who continued DQS-LX for at least 1 month (DQS-LX group) and those who wished to revert to conventional DQS within 3 months (DQS group) were retrospectively compared. Patients using eye drops or oral medications other than DQS were included in the current study, and other treatments remained unchanged, except for the switchover from DQS to DQS-LX. Only left eyes of the patients were included in this study. Patients who had used DQS for less than 3 months, used DQS-LX for less than 1 month, had punctal plugs, wore contact lenses, used anti-glaucoma eye drops, undergone eye surgery within 3 months, and could not provide consent were excluded. Clinical assessment Clinical assessment items were measured at the time of the DQS-LX switchover. Symptoms were assessed using the Standard Patient Evaluation of Eye Dryness (SPEED) validated questionnaire (scale, 0–28) [17]. Tear meniscus height (TMH) was quantitatively measured using an IDRA instrument (SBM Sistemi, Torino, Italy) [18, 19]. Lid margin abnormalities (plugging of the meibomian gland orifices and vascularity of lid margins) [20], FBUT, corneal and conjunctival fluorescein staining (CFS) [21], and meibum grade (0–3) [22] were evaluated using slit-lamp microscopy. FBUT was measured after instilling 1 μl of preservative-free 1% sodium fluorescein into the conjunctival sac using a micropipette. CFS was scored on a scale of 0–9 points as previously described [21]. Conjunctival hyperemia and papillae were observed. Morphological changes in the meibomian glands were assessed based on the meiboscore (0–6) [23] as determined by noninvasive meibography. Tear fluid production was measured using Schirmer’s test without anesthesia [24]. Statistical analysis Data are presented as means ± standard deviation (SD). The Shapiro–Wilk test revealed the non-normal distribution of the data (P < 0.05); thus, nonparametric tests were used. The Fisher’s exact test was used to compare categorical variables between the DQS and DQS-LX groups. The Mann–Whitney U test was used to compare continuous variables between the two groups. We performed a post-hoc power analysis for the SPEED score, TMH, and FBUT. For the SPEED score, the mean difference between the two groups was 3.8, with a corresponding SD of 6.2; for the TMH, the mean difference was 0.04 with an SD of 0.05; and for the FBUT, the mean difference was 0.56 with an SD of 1.29. These changes were calculated using the data from 48 eyes of 48 patients. The power (1 − β) was > 0.8 at the level of α = 0.05 for the SPEED score, TMH, and FBUT, and the sample size of this study was sufficient. Statistical analyses were performed using JMP Pro version 17 software (SAS, Cary, NC, USA). All statistical tests were two-sided, and a P-value < 0.05 was considered statistically significant. Results Demographics of the study population Of the 341 patients, 31 (9.1%) wished to revert to conventional DQS. In total 48 (14.1%) out of 341 patients had adequate records and were eligible for further analyses. The DQS group included 16 eyes of 16 patients (64.1 ± 12.6 years) and the DQS-LX group included 32 eyes of 32 patients (61.1 ± 11.2 years) (Table 1). The concomitant therapies and comorbidities at the time of the switchover to DQS-LX are shown in Tables 1 and 2. Regarding complications, allergic conjunctivitis was significantly more common in the DQS group (P = 0.034) (Table 1), and significantly more patients in the DQS group used anti-allergic eye drops (P = 0.034) (Table 2). Significantly more patients in the DQS-LX group used 0.1% fluorometholone eye drops (P = 0.012) (Table 2). Significantly more patients in the DQS-LX group used azithromycin eye drops (P = 0.002) and had a significantly higher history of intense pulsed light treatment (P = 0.013) (Table 2). Download: PPT PowerPoint slide PNG larger image TIFF original image Table 1. Baseline characteristics of patients in the DQS and the DQS-LX groups. https://doi.org/10.1371/journal.pone.0305020.t001 Download: PPT PowerPoint slide PNG larger image TIFF original image Table 2. Concomitant therapies at the switchover from DQS to DQS-LX in the DQS and DQS-LX groups. https://doi.org/10.1371/journal.pone.0305020.t002 Subjective symptoms and ocular surface parameters at the time of the switchover Subjective symptoms and tear film parameters at the time of the switchover are shown in Table 3. The DQS-LX group had higher SPEED scores, lower TMHs (P < 0.001, respectively), shorter FBUTs, greater CFS findings, larger meibum grades, lower Schirmer scores, and more pluggings compared with the DQS group (P = 0.005, 0.001, 0.001, 0.046, 0.003, respectively). Meiboscores and vascularity did not differ significantly between the two groups (P = 0.73 and 0.39, respectively) (Table 3). Download: PPT PowerPoint slide PNG larger image TIFF original image Table 3. Comparison of subjective symptoms and ocular surface parameters at the switchover from DQS to DQS-LX in the DQS and DQS-LX groups. https://doi.org/10.1371/journal.pone.0305020.t003 The reasons for reverting to DQS after switching to DQS-LX were stickiness in the eye in the morning (n = 13, 3.8%), increased eye discharge (n = 12, 3.5%), itchiness after eye drops (n = 8, 2.3%), wanting to use the eye drops more frequently than the prescribed three times a day (n = 4, 1.2%), and eye irritation (n = 3, 0.9%) (Fig 1). Download: PPT PowerPoint slide PNG larger image TIFF original image Fig 1. Reasons and percentages for reverting to DQS after switching to DQS-LX. https://doi.org/10.1371/journal.pone.0305020.g001 Demographics of the study population Of the 341 patients, 31 (9.1%) wished to revert to conventional DQS. In total 48 (14.1%) out of 341 patients had adequate records and were eligible for further analyses. The DQS group included 16 eyes of 16 patients (64.1 ± 12.6 years) and the DQS-LX group included 32 eyes of 32 patients (61.1 ± 11.2 years) (Table 1). The concomitant therapies and comorbidities at the time of the switchover to DQS-LX are shown in Tables 1 and 2. Regarding complications, allergic conjunctivitis was significantly more common in the DQS group (P = 0.034) (Table 1), and significantly more patients in the DQS group used anti-allergic eye drops (P = 0.034) (Table 2). Significantly more patients in the DQS-LX group used 0.1% fluorometholone eye drops (P = 0.012) (Table 2). Significantly more patients in the DQS-LX group used azithromycin eye drops (P = 0.002) and had a significantly higher history of intense pulsed light treatment (P = 0.013) (Table 2). Download: PPT PowerPoint slide PNG larger image TIFF original image Table 1. Baseline characteristics of patients in the DQS and the DQS-LX groups. https://doi.org/10.1371/journal.pone.0305020.t001 Download: PPT PowerPoint slide PNG larger image TIFF original image Table 2. Concomitant therapies at the switchover from DQS to DQS-LX in the DQS and DQS-LX groups. https://doi.org/10.1371/journal.pone.0305020.t002 Subjective symptoms and ocular surface parameters at the time of the switchover Subjective symptoms and tear film parameters at the time of the switchover are shown in Table 3. The DQS-LX group had higher SPEED scores, lower TMHs (P < 0.001, respectively), shorter FBUTs, greater CFS findings, larger meibum grades, lower Schirmer scores, and more pluggings compared with the DQS group (P = 0.005, 0.001, 0.001, 0.046, 0.003, respectively). Meiboscores and vascularity did not differ significantly between the two groups (P = 0.73 and 0.39, respectively) (Table 3). Download: PPT PowerPoint slide PNG larger image TIFF original image Table 3. Comparison of subjective symptoms and ocular surface parameters at the switchover from DQS to DQS-LX in the DQS and DQS-LX groups. https://doi.org/10.1371/journal.pone.0305020.t003 The reasons for reverting to DQS after switching to DQS-LX were stickiness in the eye in the morning (n = 13, 3.8%), increased eye discharge (n = 12, 3.5%), itchiness after eye drops (n = 8, 2.3%), wanting to use the eye drops more frequently than the prescribed three times a day (n = 4, 1.2%), and eye irritation (n = 3, 0.9%) (Fig 1). Download: PPT PowerPoint slide PNG larger image TIFF original image Fig 1. Reasons and percentages for reverting to DQS after switching to DQS-LX. https://doi.org/10.1371/journal.pone.0305020.g001 Discussion The study demonstrated that approximately 90% of patients who were prescribed DQS could tolerate the change to DQS-LX. Furthermore, patients with more severe DE and those with DE complicated by MGD could tolerate DQS-LX, whereas those with DE complicated by allergic conjunctivitis could not. The actions of DQS-LX include the following: (i) temporary coating of the ocular surface due to the increased viscosity of the ophthalmic solution caused by PVP, (ii) improved adherence due to the reduced frequency of required eye drops, (iii) mucin and aqueous layer secretion effects of DQS, (iv) an increased lipid layer due to lipid secretion effects, and (v) reduced friction. As DQS and DQS-LX both influence aqueous, mucin, and lipid layers, the efficacy of the eye drops in patients with severe DE may particularly be influenced by the other aforementioned factors. An increase in the lipid layer was observed for DQS in previous reports [7, 8, 11, 25]; however, DQS-LX is considered to facilitate the contact between the liquid layer and the lipid reservoir, increasing the amount of lipids in the tear film. Moreover, the improved adherence may likely lead to better results regarding mucin and water secretion effects and the lipid layer for DQS-LX than for DQS. Herein, the tolerability for DQS-LX was very good (> 90%). The group with better tolerability to DQS-LX had worse tear films, meibomian gland parameters, and subjective symptoms at the time of the switchover than the group with lesser tolerability to DQS-LX. Patients with moderate-to-severe DE and DE complicated by MGD tended to tolerate DQS-LX well. We speculated that the increased viscosity of DQS-LX due to the addition of the PVP resulted in a better coating of the ocular surface, reduction in ocular surface irritation, improvement in tear fluid stability, and improvements in corneal and conjunctival epithelial damage. It has also been suggested that DQS-LX may be longer-lasting in patients with DE with concomitant MGD because of its lipid-increasing effect on the tear film, which decreases friction between the eyelid and cornea, facilitates eyelid opening, and decreases the evaporation of tear fluid. It has been suggested that patients with DE and allergic conjunctivitis may have difficulty tolerating DQS-LX because PVP, which is added to DQS-LX as a viscosifying agent, increases the residence time of allergens on the ocular surface and exacerbates the symptoms (itching). Ishikawa et al. [15] reported that 94.4% (51/54) of patients preferred DQS-LX. However, therein [15], only patients with relatively mild disease who used DQS and DQS-LX as a single therapy were included. Therefore, we included patients who were receiving concomitant DE medications, such as rebamipide or sodium hyaluronate eye drops, as well as patients with a history of intense pulsed light treatment to represent patients with DE in a real clinical scenario. The combination of IPL and DQS was more effective than IPL alone in improving subjective symptoms and objective signs such as tear film stability, corneal conjunctival staining, and meibomian gland quality and expressibility [26]. In the real-world clinical practice, treatment is often combined rather than using one therapy alone. Therefore, our study included patients who were prescribed DQS as well those who were treated with a combination of various DE treatments and/or IPL. Although there were differences in disease severity among participants, the results were similar. Kaido and Arita [16] reported that 84.8% (46/56) of patients had an FBUT of 2.9 ± 1.9 s and a similar DE severity; however, the mean age of the cohort was 74.0 ± 10.4 years, which was older than that in our study cohort. Tear fluid clearance is expected to decrease with aging owing to increased complications of conjunctival chalasis [27] and reduced blinking ability [28]. When these complications occur in older patients, the high viscosity of DQS-LX may result in ineffective diffusion on the ocular surface and excessive retention of ophthalmic fluid in the lower eyelid. The stability of the tear film and improvement of corneal flaws may be affected, making eye drops more difficult to apply and less successful in covering the ocular surface. The reasons for not tolerating the DQS-LX were as follows: dislike of sticky eyelids upon waking, concern regarding large amounts of eye discharge, itchy eyes, desire for frequent application, and eye irritation. These results are similar to those of previous reports [14, 15]. However, these percentages were similar to the results of Ishikawa et al. [15], but less than those reported by Kaido and Arita [16]. The difference in the proportion of side effects may be related to age differences among the subjects [16]. The Dry Eye Assessment and Management (DREAM) study [29] reported that as age increased, corneal and conjunctival staining findings increased, BUT shortened, symptoms worsened, and tear osmolarity increased; the older age of the previous study’s cohort [16] likely contributed to the higher rate of complaints regarding ocular symptom [30]. Moreover, the presence or absence of an effect may not correspond to the presence or absence of discomfort caused by the eye drops. Thus, there is a possibility that some patients experience an effect but find the eye drops uncomfortable, or that there is no effect but the eye drops feel good. Therefore, further consideration should be given to the choice of ophthalmic drops. We aim to collect objective data after the switchover and discussed the results in a future study. The retrospective nature of this study presents a limitation because it examined the tolerability of DQS-LX in patients who were already prescribed DQS. Future prospective studies are required to determine the characteristics of patients who prefer DQS over DQS-LX and vice versa. Conclusion High-viscosity DQS-LX ophthalmic solution is well-tolerated in patients with DE. Patients with moderate or severe DE and MGD tended to prefer DQS-LX, whereas those with DE and allergic findings preferred conventional DQS. Supporting information S1 Table. Raw data. https://doi.org/10.1371/journal.pone.0305020.s001 (PDF) S2 Table. Raw data. https://doi.org/10.1371/journal.pone.0305020.s002 (PDF) S3 Table. Raw data. https://doi.org/10.1371/journal.pone.0305020.s003 (PDF) S4 Table. Raw data. https://doi.org/10.1371/journal.pone.0305020.s004 (PDF)
TI - Tolerability of Diquas LX on tear film and meibomian glands findings in a real clinical scenario
JF - PLoS ONE
DO - 10.1371/journal.pone.0305020
DA - 2024-09-26
UR - https://www.deepdyve.com/lp/public-library-of-science-plos-journal/tolerability-of-diquas-lx-on-tear-film-and-meibomian-glands-findings-iHviPLI405
SP - e0305020
VL - 19
IS - 9
DP - DeepDyve
ER -