Ji-Won Kim1,2, Yoon Young Kim1,2, Hwajeong Lee1,2, Sung-Hoon Park1,2, Seong-Kyu Kim1,2, Jung-Yoon Choe3,4. 1. From the Division of Rheumatology, Department of Internal Medicine, and Department of Ophthalmology, Catholic University of Daegu School of Medicine, Daegu, Korea. 2. J.W. Kim, MD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine; Y.Y. Kim, MD, PhD, Department of Ophthalmology, Catholic University of Daegu School of Medicine; H. Lee, MD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine; S.H. Park, MD, PhD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine; S.K. Kim, MD, PhD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine; J.Y. Choe, MD, PhD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine. 3. From the Division of Rheumatology, Department of Internal Medicine, and Department of Ophthalmology, Catholic University of Daegu School of Medicine, Daegu, Korea. jychoe@cu.ac.kr. 4. J.W. Kim, MD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine; Y.Y. Kim, MD, PhD, Department of Ophthalmology, Catholic University of Daegu School of Medicine; H. Lee, MD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine; S.H. Park, MD, PhD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine; S.K. Kim, MD, PhD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine; J.Y. Choe, MD, PhD, Division of Rheumatology, Department of Internal Medicine, Catholic University of Daegu School of Medicine. jychoe@cu.ac.kr.
Abstract
OBJECTIVE: Several studies have reported risk factors for hydroxychloroquine (HCQ) retinal toxicity, but data are limited for patients of Asian ancestry. The aim of this study was to investigate the rate of and factors for HCQ retinal toxicity in the Korean population. METHODS: There were 123 patients enrolled in this study who were using or had used HCQ. Retinal toxicity was detected using spectral domain optical coherence tomography, fundus autofluorescence, multifocal electroretinography, and automated visual field testing. Binary logistic regression analysis was performed to identify factors associated with HCQ retinal toxicity. RESULTS: Mean duration of HCQ use and mean HCQ dose in study participants was 10.1 years and 6.4 mg/kg, respectively. We found 17 patients (13.8%) with HCQ retinal toxicity among 123 patients. Patients with retinal toxicity took HCQ ranging from 6.7-21.9 years and daily dosage ranging from 4.9-9.1 mg/kg. Only 1 patient had retinal toxicity among patients with daily dose < 5.0 mg/kg. These factors increased the risk of HCQ retinal toxicity: longer duration of HCQ use [adjusted OR (aOR) = 4.71, 95% CI 2.18-10.15 for duration of HCQ use in 5-yr increments], higher daily HCQ dose (aOR = 3.34, 95% CI 1.03-10.80 for daily HCQ dose in 100-mg increments), and the presence of kidney disease (aOR = 8.56, 95% CI 1.15-64.00). CONCLUSION: HCQ retinal toxicity is associated with duration of HCQ use, daily HCQ dose, and presence of kidney disease. Proper dosing of maximum 5 mg/kg and regular screening according to risk factors are important in HCQ use.
OBJECTIVE: Several studies have reported risk factors for hydroxychloroquine (HCQ) retinal toxicity, but data are limited for patients of Asian ancestry. The aim of this study was to investigate the rate of and factors for HCQ retinal toxicity in the Korean population. METHODS: There were 123 patients enrolled in this study who were using or had used HCQ. Retinal toxicity was detected using spectral domain optical coherence tomography, fundus autofluorescence, multifocal electroretinography, and automated visual field testing. Binary logistic regression analysis was performed to identify factors associated with HCQ retinal toxicity. RESULTS: Mean duration of HCQ use and mean HCQ dose in study participants was 10.1 years and 6.4 mg/kg, respectively. We found 17 patients (13.8%) with HCQ retinal toxicity among 123 patients. Patients with retinal toxicity took HCQ ranging from 6.7-21.9 years and daily dosage ranging from 4.9-9.1 mg/kg. Only 1 patient had retinal toxicity among patients with daily dose < 5.0 mg/kg. These factors increased the risk of HCQ retinal toxicity: longer duration of HCQ use [adjusted OR (aOR) = 4.71, 95% CI 2.18-10.15 for duration of HCQ use in 5-yr increments], higher daily HCQ dose (aOR = 3.34, 95% CI 1.03-10.80 for daily HCQ dose in 100-mg increments), and the presence of kidney disease (aOR = 8.56, 95% CI 1.15-64.00). CONCLUSION:HCQ retinal toxicity is associated with duration of HCQ use, daily HCQ dose, and presence of kidney disease. Proper dosing of maximum 5 mg/kg and regular screening according to risk factors are important in HCQ use.