Hydroxychloroquine Dose and Risk for Incident Retinopathy : A Cohort Study

Hydroxychloroquine dose-dependently reduces the risk of incident diabetes in primary Sjögren syndrome patients on glucocorticoids: a nationwide population-based cohort study

BACKGROUND

Hydroxychloroquine (HCQ) is commonly used to treat Sjögren syndrome (SS). Glucocorticoids, which are commonly applied for managing primary SS (pSS), can disrupt glucose metabolism and increase diabetes mellitus (DM) risk. HCQ reduces DM risk in systemic lupus erythematosus and rheumatoid arthritis.

OBJECTIVE

This study aimed to investigate the relationship between HCQ and glucocorticoids in the incidence of new-onset diabetes in pSS.

METHODS

This nationwide population-based cohort study identified patients diagnosed with pSS from the Taiwan's National Health Insurance Research Database from 2006 to 2015. Multivariate and stratified analyses, Kaplan-Meier method, and Cox proportional hazard regression were used to evaluate DM risk associated with the use of HCQ and glucocorticoid, both individually and in combination.

RESULTS

Among pSS patients (4,874 HCQ users and 2,437 HCQ nonusers), 497 patients developed DM over an average follow-up of 4.89 years. Multivariate analysis revealed significantly lower adjusted hazard ratios (aHRs) for DM in HCQ users in the 151-350 cumulative defined daily dose (cDDD) and ≥ 351 cDDD subgroups (0.600, 95% CI: 0.454-0.794 and 0.326, 95% CI: 0.246-0.433, respectively) compared with HCQ nonusers. High-dose glucocorticoids (≥ 151 cDDD) were linked to increased DM risk (aHR: 1.833, 95% CI: 1.410-2.383). However, high-dose HCQ (> 350 cDDD) mitigated this risk, even the risk caused by the use of high-dose glucocorticoids (≥ 151 cDDD) (aHR: 0.632, 95% CI: 0.421-0.948, P < 0.01).

CONCLUSIONS

Our study demonstrated that HCQ exposure significantly reduces the risk of developing diabetes in patients with pSS. While higher doses of glucocorticoids are associated with an increased diabetes risk, concurrent HCQ use mitigates this risk in a dose-dependent manner.

Cost-effectiveness of hydroxychloroquine retinopathy screening: the current guideline versus no screening and reduced regimens

OBJECTIVE

Hydroxychloroquine (HCQ) effectively treats autoimmune diseases but prolonged use may lead to retinopathy and subsequent vision loss. Guidelines suggest annual follow-up after 5 years for low-risk and 1 year for high-risk patients. This study evaluates the cost-effectiveness of current screening guidelines and a reduced regimen in the Netherlands from a societal perspective.

METHODS

A Markov model assessed costs and quality-adjusted life-years (QALYs) for current and reduced screening regimens. The model included 359 HCQ-treated patients from Radboud University Medical Center. Cost-effectiveness was examined in the general population and patients using < 5.0 mg/kg, 5.0-6.0 mg/kg, or > 6.0 mg/kg HCQ per day for several reduced regimens.

RESULTS

Compared to no screening, the current screening guideline saves costs (i.e., €210 per patient), while gaining QALYs (i.e., 0.79 QALY per patient) over a lifetime in the Netherlands. However, in patients receiving < 5.0 mg/kg HCQ per day, a biennial screening regimen after 10 years using SD-OCT was more cost-effective. For those with 5.0-6.0 mg/kg and > 6.0 mg/kg per day, initiating annual screening with an SD-OCT after 5 years was more cost-effective than the current guideline.

CONCLUSIONS

Screening for HCQ retinopathy is cost-effective, but delayed initiation and a reduced frequency, using solely an SD-OCT, are more cost-effective. We recommend screening with an SD-OCT and a biennial regimen after 10 years for low-risk patients, an annual regimen after 5 years for intermediate- and high-risk patients.

Risk of ophthalmic adverse drug reactions in patients prescribed glucagon-like peptide 1 receptor agonists: a pharmacovigilance study based on the FDA adverse event reporting system database

OBJECTIVE

To investigate the association between glucagon-like peptide 1 receptor agonists (GLP-1 RAs) and ophthalmic adverse drug reactions (OADRs) using data from the FDA Adverse Event Reporting System (FAERS).

METHODS

This retrospective pharmacovigilance study analyzed post-marketing FAERS data from 2018 to 2023 to identify GLP-1 RA-related OADRs. This study employed the Weibull model for time-to-onset (TTO) analysis, Bayesian Information Component analysis for disproportionality comparing GLP-1 RAs with other drugs, and the Ω shrinkage method for co-medication analysis.

RESULTS

FAERS reported 5003 OADRs associated with GLP-1 RAs, including retinopathy and visual impairment. Disproportionality analysis identified significant signals for semaglutide, liraglutide, and exenatide, suggesting potential associations with OADRs. Co-medication analysis indicated that OADRs primarily resulted from GLP-1 RA use. TTO analysis categorized most OADRs as early failures, emphasizing the need for early monitoring.

CONCLUSION

This study emphasizes the importance of ophthalmic surveillance in patients using GLP-1 RAs, particularly semaglutide, dulaglutide, and exenatide. Enhanced monitoring and patient education are essential for timely detection and management of potential OADRs. Regulatory agencies should consider updating drug labels to include comprehensive warnings about OADRs associated with GLP-1 RA therapies.

Hydroxychloroquine in patients with systemic lupus erythematosus: how much is enough?

OBJECTIVE

To assess the daily and weight-adjusted dosages of hydroxychloroquine (HCQ) and the effects on long-term remission in the Lupus-Cruces cohort.

METHODS

Observational study of routine clinical care data. We selected inception patients treated with HCQ with at least 5 years of follow-up. Prolonged remission was achieved when patients fulfilled definitions of remission in systemic lupus erythematosus remission criteria in five consecutive yearly visits. The associations between the weight-adjusted dose of HCQ during 5 years and prolonged remission were analysed. We also investigated the associations between prednisone doses, immunosuppressives (IS) and other antimalarial use with HCQ doses.

RESULTS

150 inception patients fulfilled the inclusion criteria. The mean starting dose of HCQ was 206 mg/day. The mean weight-adjusted starting dose of HCQ was 3.1 mg/kg/day with no patients treated with doses ≥5 mg/kg/day. Treatment with HCQ was maintained during the whole 5-year follow-up time in 147 patients (98%). The mean dose of HCQ during the 5-year follow-up was 194.6 mg/day (2.9 mg/kg/day). 108 patients (72%) were in prolonged remission. The mean weight-adjusted dose of HCQ per patient did not differ between those who did and did not achieve prolonged remission (2.9 vs 3 mg/kg/day, p=0.5). The dose of prednisone per patient (mean 2.3 mg/day during the 5-year follow-up) did not differ according to the weight-adjusted dose of HCQ. The mean weight-adjusted HCQ dose during the whole follow-up was the same in patients treated or not with IS or with mepacrine.

CONCLUSIONS

With the use of HCQ at stable doses of 200 mg/day (or 3.0-3.5 mg/kg/day) as the background therapy in patients with systemic lupus erythematosus, the majority of patients achieved prolonged remission.

Acupuncture Combined with Periocular Injection for Treatment of Hydroxychloroquine Retinopathy with Cystoid Macular Edema: A Case Report

CONCLUSION

For HCQ retinopathy with CME, acupuncture combined with periocular injection can be used to improve the CME and protect the central vision. Subsequent research endeavors involving a more extensive cohort and extended observation periods are warranted to evaluate the effectiveness and safety profile of the intervention.

Treatment trends of systemic lupus erythematosus from 2007 to 2023 in the USA

OBJECTIVE

To characterise the changing trends in the pharmacological management of SLE in the USA between 2007 and 2023 as new treatment options emerged.

METHODS

In a retrospective cohort study using data from OptumLabs Data Warehouse, we characterised the annual prevalent (ie, all) and incident (ie, new) use of antimalarials, glucocorticoids and immunosuppressive medications among patients with SLE from 2007 to 2023 and assessed for changing trends over time.

RESULTS

We identified 19 122 adults with SLE; they were 51.2 (SD 16.1) years of age, 89% were female, 61.3% were White, 18.5% were Black and 13.1% were Hispanic. The proportion of prevalent users of antimalarials has decreased from 79.4% in 2007 to 77.2% in 2023 (p=0.0055), while the proportion of incident users fluctuated between a lowest 5.8% in 2021 and a highest 8.1% in 2008 (p=0.008). The proportion of prevalent users of glucocorticoids increased from 64.6% in 2007 to 66.7% in 2023 (p=0.0132), as did the proportion of incident users (12.4% in 2007 to 21.7% in 2023; p<0.0001). The use of cyclophosphamide (2.0% in 2007 to 0.4% in 2023, p<0.0001) has decreased; the use of mycophenolate mofetil (7.7% in 2007 to 10.3% in 2023, p<0.0001), rituximab (1.4% in 2007 to 2.1% in 2023, p<0.0001) and belimumab (0.8% in 2011 to 6.1% in 2023, p=0.0001) has increased.

CONCLUSIONS

Despite increasing availability of alternative treatment options, patients with SLE in the USA increasingly rely on glucocorticoid-based therapy. Efforts to improve the use of antimalarials and steroid-sparing immunosuppressants are needed.

Risk of flare in patients with SLE in remission after hydroxychloroquine or chloroquine withdrawal

OBJECTIVE

Previous studies have provided evidence that the discontinuation of hydroxychloroquine (HCQ), and chloroquine (CQ), in patients with systemic lupus erythematosus (SLE) is associated with an increased risk of disease flares, with limited information on the level of disease activity at the time of HCQ/CQ discontinuation. Here we aimed to describe the risk of SLE flare after withdrawal of HCQ or CQ in patients with SLE in remission.

METHODS

Case-control study (1:2) comparing the evolution of patients with SLE after HCQ/CQ withdrawal for antimalarial retinopathy (cases) with patients with SLE matched for sex, antimalarial treatment duration and age at SLE diagnosis, whose antimalarial treatment was continued throughout the entire follow-up period (controls). To be included in the study, patients had to be in remission for at least one year according to the DORIS classification. The primary endpoint was the proportion of patient experiencing a flare according to the SELENA-SLEDAI Flare Index after a 36-month follow-up.

RESULTS

We studied 48 cases and 96 controls. The proportion of patients experiencing a flare was significantly higher in the HCQ/CQ withdrawal group as compared to the maintenance group (15 [31.3%] patients versus 12 [12.5%]; OR 3.1 [95%CI 1.2-8.2], P=0.01). Withdrawal of HCQ/CQ was inferior with respect to occurrence of severe SLE flare (12 [25.0%] vs 11 [11.5%]; OR 2.5 [95%CI 0.9-6.9], P=0.053) and time to first flare (HR 6.3 [2.0-19.9], P<0.005). Elevated serum levels of anti-dsDNA antibodies were identified as a risk factor for SLE flare following HCQ/CQ discontinuation (HR 5.4 [1.5-18.7], P<0.01).

CONCLUSION

Withdrawal of HCQ or CQ in patients with SLE in remission is associated with a 3-fold increased risk of relapse.

Elucidating the mechanisms and efficacy of antimalarial drugs in systemic lupus erythematosus

INTRODUCTION

Antimalarials (AMs) are old drugs with a wide range of beneficial effects in systemic lupus erythematosus (SLE) beyond the control of activity. The most recent debate is focused on defining the optimal doses to assure the best benefit/risk ratio.

AREAS COVERED

We have reviewed the pharmacological basis underlying the various therapeutic effects of AMs and the beneficial and toxic effects of HCQ, also discussing the role of mepacrine not only as a substitute in cases of maculopathy, but also as a very effective therapy combined with HCQ. We searched PubMed and Embase for articles published in English at any time. We used the terms "hydroxychloroquine" or "mepacrine" or "chloroquine" or "antimalarials", "pharmacokinetics", "efficacy", "remission", "toxicity", "adherence". We reviewed original research articles, large observational studies, systematic reviews, and expert consensus statements. Additionally, studies were identified through the assessment of the reference lists of the evaluated manuscripts.

EXPERT OPINION

We advocate for the widespread use of HCQ at stable doses of 200 mg/d (≤4 mg/kg/d for most patients) and also for the early combination therapy with mepacrine to assure a good control of SLE activity, and also a durable and safe use of these essential drugs for the management of SLE.

Hydroxychloroquine Dose and Hospitalizations for Active Lupus

OBJECTIVE

We sought to determine the impact of hydroxychloroquine (HCQ) dose on the risk of hospitalizations for systemic lupus erythematosus (SLE).

METHODS

We conducted a case-crossover study within an academic health system, including patients with SLE who used HCQ and had ≥1 hospitalization for active SLE between January 2011 and December 2021. Case periods ended in hospitalization for SLE, whereas control periods did not. The exposures were the average weight-based HCQ dose, categorized as ≤5 or >5 mg/kg/day, and non-weight-based HCQ dose, categorized as <400 or 400 mg/day, assessed during each six-month case or control period. Odds ratios (ORs) were calculated using conditional logistic regression and adjusted for prior disease activity, kidney function, glucocorticoid use, and other immunosuppressant use.

RESULTS

Of 2,974 patients with SLE who used HCQ (mean age 36.5 years; 92% female), 584 had ≥1 hospitalization with primary discharge diagnosis of SLE. Of these, 122 had ≥1 hospitalization for active SLE while using HCQ and had ≥1 control period with HCQ use during the study period. Lower HCQ weight-based dose (≤5 vs >5 mg/kg/day) and non-weight-based dose (<400 vs 400 mg/day) were each associated with increased hospitalizations for active SLE (adjusted OR 4.20, 95% confidence interval [CI] 1.45-12.19, and adjusted OR 3.39, 95% CI 1.31-8.81).

CONCLUSION

The use of lower doses of HCQ was associated with an increased risk of hospitalizations for active SLE. Although the long-term risk of HCQ retinopathy must be acknowledged, this must be balanced with the short-term and cumulative risks of increased SLE activity.

Classification of Hydroxychloroquine Retinopathy: A Literature Review and Proposal for Revision

Establishing universal standards for the nomenclature and classification of hydroxychloroquine retinopathy is essential. This review summarizes the classifications used for categorizing the patterns of hydroxychloroquine retinopathy and grading its severity in the literature, highlighting the limitations of these classifications based on recent findings. To overcome these limitations, I propose categorizing hydroxychloroquine retinopathy into four categories based on optical coherence tomography (OCT) findings: parafoveal (parafoveal damage only), pericentral (pericentral damage only), combined parafoveal and pericentral (both parafoveal and pericentral damage), and posterior polar (widespread damage over parafoveal, pericentral, and more peripheral areas), with or without foveal involvement. Alternatively, eyes can be categorized simply into parafoveal and pericentral retinopathy based on the most dominant area of damage, rather than the topographic distribution of overall retinal damage. Furthermore, I suggest a five-stage modified version of the current three-stage grading system of disease severity based on fundus autofluorescence (FAF) as follows: 0, no hyperautofluorescence (normal); 1, localized parafoveal or pericentral hyperautofluorescence on FAF; 2, hyperautofluorescence extending greater than 180° around the fovea; 3, combined retinal pigment epithelium (RPE) defects (hypoautofluorescence on FAF) without foveal involvement; and 4, fovea-involving hypoautofluorescence. These classification systems can better address the topographic characteristics of hydroxychloroquine retinopathy using disease patterns and assess the risk of vision-threatening retinopathy by stage, particularly with foveal involvement.

Recent findings about antimalarials in cutaneous lupus erythematosus: What dermatologists should know

Antimalarials (AMs), particularly hydroxychloroquine (HCQ) and chloroquine (CQ), are the cornerstone of the treatment for both systemic lupus erythematosus (SLE) and cutaneous lupus erythematosus (CLE). HCQ and CQ are recommended as first-line oral agents in all CLE guidelines. Initially thought to have potential therapeutic effects against COVID-19, HCQ has drawn significant attention in recent years, highlighting concerns over its potential toxicity among patients and physicians. This review aims to consolidate current evidence on the efficacy of AMs in CLE. Our focus will be on optimizing therapeutic strategies, such as switching from HCQ to CQ, adding quinacrine to either HCQ or CQ, or adjusting HCQ dose based on blood concentration. Additionally, we will explore the potential for HCQ dose reduction or discontinuation in cases of CLE or SLE remission. Our review will focus on the existing evidence regarding adverse events linked to AM usage, with a specific emphasis on severe events and those of particular interest to dermatologists. Last, we will discuss the optimal HCQ dose and the balance between preventing CLE or SLE flares and minimizing toxicity.

Multidisciplinary consensus on the use of hydroxychloroquine in patients with systemic lupus erythematosus

BACKGROUND

Hydroxychloroquine (HCQ) is the first-line treatment for systemic lupus erythematosus (SLE); however, there is heterogeneity in its clinical use. This consensus aims to bridge the gap in SLE treatment by providing practical and valuable recommendations for health professionals.

METHODS

The methodology used is based on a systematic literature review and a nominal group technique (NGT). A ten-member scientific committee formulated eight clinically relevant questions. First, a systematic review was conducted to identify the available evidence, which the scientific committee evaluated to developed recommendations based on their expertise, achieving consensus through NGT.

RESULTS

1673 titles and abstracts were screened, and 43 studies were included for meeting the inclusion criteria. The scientific committee established 11 recommendations for HCQ use in initiation, maintenance, and monitoring, considering benefits and potential adverse effects of HCQ. Unanimous agreement was achieved on all recommendations.

CONCLUSIONS

The available evidence supports HCQ's effectiveness and safety for SLE. Individualized assessment of the initial HCQ dose is important, especially in situations requiring dose reduction or discontinuation. This risk-benefit assessment, specifically focusing on the balance between retinal toxicity and the risk of SLE relapse, should guide decisions regarding medication withdrawal, considering disease activity, risk factors, and HCQ potential benefits. Close monitoring is essential for optimal disease management and minimize potential risks, such as QT prolongation or retinal toxicity.

Identification of new risk factors for hydroxychloroquine and chloroquine retinopathy in systemic lupus erythematosus patients

BACKGROUND

Long-term hydroxychloroquine (HCQ) or chloroquine (CQ) intake causes retinal toxicity in 0.3-8 % of patients with rheumatic diseases. Numerous risk factors have been described, eg, daily dose by weight, treatment duration, chronic kidney disease, concurrent tamoxifen therapy and pre-existing retinal or macular disease. However, those factors cannot explain the entire risk of developing antimalarial retinopathy.

OBJECTIVE

This study was undertaken to identify new risk factors associated with HCQ or CQ retinopathy (QRNP) in systemic lupus erythematosus (SLE) patients.

METHODS

This case-control (1:2) study compared SLE patients with QRNP (cases) to those without (controls). Controls were matched for sex and known QRNP risk factors: HCQ and/or CQ treatment duration (±1 year) and age (±5 year) at SLE diagnosis.

RESULTS

Forty-eight cases were compared to 96 SLE controls. Multivariable logistic-regression analysis retained the following as independent determinants significantly associated with QRNP: concomitant selective serotonin-reuptake inhibitor (SSRI) or serotonin- and norepinephrine-reuptake inhibitor (SNRI) intake (OR [95 % confidence interval] 6.6 [1.2 to 40.9]; p < 0.01); antiphospholipid syndrome (OR=8.9 [2.2 to 41.4] p < 0.01); blood hydroxychloroquine/desethylchloroquine concentration ([HCQ]/[DCQ]) ratio <7.2 (OR 8.4 [2.7 to 30.8]; p < 0.01) or skin phototype ≥4 (OR 5.5 [1.4 to 26.5]; p = 0.02), but not daily HCQ dose, blood [HCQ] or body mass index.

CONCLUSION

The results of this case-control study identified blood [HCQ]/[DCQ] ratio, concurrent SSRI/SNRI therapy, skin phototype ≥4 and antiphospholipid syndrome as new risk factors for QRNP.

Risk Factors for Hydroxychloroquine Retinopathy and Its Subtypes

Importance

The major toxic effect of hydroxychloroquine is retinopathy. Thus, current guidelines recommend limiting the dose and screening annually for retinopathy among all long-term users, but individual patient factors may be associated with retinopathy risk.

Objective

To identify risk factors beyond hydroxychloroquine dose and duration of use for hydroxychloroquine retinopathy.

Design, Setting, and Participants

This cohort study of 4677 patients in the Kaiser Permanente Northern California integrated health network who initiated hydroxychloroquine, continued treatment, and underwent retinopathy screening after 5 years of use was conducted from July 1, 1997, to December 31, 2020, with up to 15 years of follow-up. Statistical analysis was performed in August 2023.

Exposure

Candidate risk factors included age at hydroxychloroquine initiation, sex, race and ethnicity, indications, chronic kidney disease (CKD), liver disease, diabetes, tamoxifen use, and medications that interact with hydroxychloroquine metabolism. Hydroxychloroquine dose was assessed from pharmacy dispensing records.

Main Outcome and Measures

Incident hydroxychloroquine retinopathy was adjudicated from masked review of guideline-recommended screening studies and classified as parafoveal or pericentral pattern. Multivariable Cox proportional hazards regression was used to assess potential risk factors for hydroxychloroquine retinopathy within 15 years of initiation.

Results

Of 4677 long-term hydroxychloroquine users (mean [SD] age at initiation, 52.4 [14.1] years; 3877 women [82.9%]), 125 patients developed hydroxychloroquine retinopathy within 15 years (102 parafoveal, 23 pericentral). Older age at time of hydroxychloroquine initiation was associated with retinopathy risk, with adjusted hazard ratios (HRs) of 2.48 (95% CI, 1.28-4.78) for those aged 45 to 54 years, 3.82 (95% CI, 2.05-7.14) for those aged 55 to 64 years, and 5.68 (95% CI, 2.99-10.79) for those aged 65 years or older compared with those younger than 45 years. The risk of retinopathy was higher among females than males (HR, 3.83 [95% CI, 1.86-7.89]), among patients with CKD stage 3 or greater (HR, 1.95 [95% CI, 1.25-3.04]), and among individuals with tamoxifen use (HR, 3.43 [95% CI, 1.08-10.89]). The likelihood of pericentral retinopathy was higher among Asian patients (HR, 15.02 [95% CI, 4.82-46.87]) and Black patients (HR, 5.51 [95% CI, 1.22-24.97]) compared with non-Hispanic White patients.

Conclusions and Relevance

This study suggests that increasing age, female sex, CKD stage 3 or greater, and tamoxifen use were associated with a higher risk of hydroxychloroquine retinopathy, whereas being younger than 45 years at hydroxychloroquine initiation and male sex were associated with a lower risk. Race and ethnicity were also associated with the pattern of retinopathy. These factors should be incorporated into hydroxychloroquine dosing decisions.

Automated Evaluation of Ellipsoid Zone At-Risk Burden for Detection of Hydroxychloroquine Retinopathy

BACKGROUND

Screening for hydroxychloroquine (HCQ) retinopathy is crucial to detecting early disease. A novel machine-learning-based optical coherence tomography (OCT) biomarker, Ellipsoid Zone (EZ) At-Risk, can quantitatively measure EZ alterations and at-risk areas for progressive EZ loss in a fully automated fashion. The purpose of this analysis was to compare the EZ At-Risk burden in eyes with HCQ toxicity to eyes without toxicity.

METHODS

IRB-approved image analysis study of 83 subjects on HCQ and 44 age-matched normal subjects. SD-OCT images were reviewed for evidence of HCQ retinopathy. A ML-based, fully automatic measurement of the percentage of the macular area with EZ At-Risk was performed.

RESULTS

The mean age for HCQ subjects was 67.1 ± 13.2 years and 64.2 ± 14.3 years for normal subjects. The mean EZ At-Risk macular burden in the "toxic" group (n = 38) was significantly higher (10.7%) compared to the "non-toxic" group (n = 45; 2.2%; p = 0.023) and the "normal" group (1.4%; p = 0.012). Additionally, the amount of EZ At-Risk burden was significantly correlated with the HCQ dose based on the actual (p = 0.016) and ideal body weight (p = 0.033).

CONCLUSIONS

The novel biomarker EZ-At Risk was significantly higher in subjects with evidence of HCQ retinopathy as well as significantly associated with HCQ dose. This novel biomarker should be further evaluated as a potential screening tool for subjects on HCQ.

New proposal for a multimodal imaging approach for the subclinical detection of hydroxychloroquine-induced retinal toxicity in patients with systemic lupus erythematosus

OBJECTIVE

To compare multimodal structural and functional diagnostic methods in patients with systemic lupus erythematosus (SLE) treated with hydroxychloroquine, to identify the best complementary approach for detecting subclinical retinal toxicity.

METHODS

A cross-sectional, unicentric study was conducted on patients with SLE treated with hydroxychloroquine. Each patient underwent a comprehensive ophthalmic evaluation, comprising structural tests (spectral-domain optical coherence tomography (SD-OCT), en face OCT, en face OCT angiography (OCTA), fundus autofluorescence (FAF)) and functional tests (automated perimetry for visual field (VF) testing, multifocal electroretinography (mfERG)). A diagnosis of macular toxicity required the presence of abnormalities in at least one structural and functional test. The Kappa Concordance Index was used to assess the concordance among the different tests in detecting potential macular toxicity-associated alterations.

RESULTS

Sixty-six patients with SLE (132 eyes) were consecutively enrolled. Four (6.1%) patients developed subclinical hydroxychloroquine-induced retinal toxicity without visual acuity impairment. The proportion of abnormal results was 24% for both en face OCT and en face OCTA. Regarding functional analysis, VF was less specific than mfERG in detecting subclinical retinal toxicity (VF specificity 47.5%). En face OCT and en face OCTA structural findings showed better concordance, with a kappa index >0.8, and both identified the same cases of toxicity as FAF.

CONCLUSION

Although structural OCT and VF are frequently used to screen for hydroxychloroquine-induced retinal toxicity, our findings suggest that a combination of mfERG, en face OCT and en face OCTA could improve the diagnostic accuracy for subclinical retinal damage. This study emphasises the importance of a multimodal imaging strategy to promptly detect signs of hydroxychloroquine-induced retinal toxicity.

Dermatologists' and Rheumatologists' Adherence to the Latest Recommendations for Screening of Hydroxychloroquine Retinopathy in Saudi Arabia: A Cross-Sectional Study

INTRODUCTION

 Hydroxychloroquine (HCQ) is used to manage the symptoms of inflammatory rheumatic and dermatologic disorders. However, HCQ retinopathy is a serious side effect because even after the drug is discontinued, irreversible vision loss may occur and may continue to progress. According to the American Academy of Ophthalmology (AAO), the recent recommendation for HCQ dosing is ≤5 mg/kg of real body weight, with baseline ophthalmologic screening during the first year of HCQ treatment and yearly screening after five years of continuous use of HCQ medication, unless the patient is at high risk or symptoms have developed. Nonetheless, this study aims to assess dermatologists' and rheumatologists' adherence in Saudi Arabia to the 2016 AAO HCQ retinal toxicity guidelines.

METHODS

 A questionnaire-based cross-sectional study was conducted on dermatologists and rheumatologists in Saudi Arabia. It was conducted between August and September 2022 and questionnaires were sent to dermatologists and rheumatologists via their professional emails or accounts.

RESULTS

The collected sample consisted of 635 participants; males and females represented 54% and 46%, respectively; 47.6% were consultants; 50.1% were rheumatologists; and 49.9% were dermatologists. Approximately 28.2% of the participants reported treating one to three patients with HCQ in the previous year. Only 45.4% of the respondents stated that the ideal recommended HCQ dose for reducing the risk of retinopathy is "≤ 5 mg/kg of the real body weight." More than 50% of the respondents stated that systemic lupus erythematosus was the most common disease for which they used HCQ. Additionally, 36.5% of the physicians screened patients during the first year of HCQ treatment. We found significant associations between practice levels and specialty practice-related questions with a p-value of less than 0.05, except for the specialty practice-related question, "What is the most common disease for which you use HCQ?" with a p-value of 0.074. Also, we found significant associations between all demographic variables and screening-related variables with a p-value of less than 0.05, with two exceptions: no significant associations were found between specialty area and the screening-related question, "Do you recommend screening tests for all patients starting treatment with HCQ?" at p = 0.270, and gender and the screening-related question, "When would you recommend screening tests for a patient without risk?" at p = 0.142.

CONCLUSIONS

 Dermatologists and rheumatologists in Saudi Arabia have shown poor adherence to the most recent AAO recommendations. Educating physicians and patients about the AAO guidelines is needed for HCQ to be used in a way that is both effective and safe.

Kidney involvement in systemic lupus erythematosus: From the patient assessment to a tailored treatment

In the last few years, several studies have provided new evidence for the diagnosis, management, and follow-up of patients with lupus nephritis. Evidence showing dissociation between clinical and histological findings has prompted reevaluation of the role of the kidney biopsy as a tool for diagnosis and follow-up. In therapeutics, four immunosuppressive schemes now have supporting evidence for use as initial therapy. Current challenges include individualized selection of the best immunosuppressive regimen, an unmet need for non-invasive biomarkers of disease activity to inform treatment responses and guide subsequent therapy, holistic patient management in this complex, multisystem disease, and ultimately the development of more targeted therapies directed at specific effector pathways driving glomerular inflammation and damage in order to improve treatment response. In this communication, we review the diagnostic and therapeutic approach to lupus nephritis, as well as evaluation of response to therapy and disease control.

Hydroxychloroquine and retinopathy risk

Overview of: Melles RB, Jorge AM, Marmor MF, et al. Hydroxychloroquine dose and risk for incident retinopathy: a cohort study. Ann Intern Med 2023;176:166-73.