N Ezer1, A Benedetti, M Darvish-Zargar, D Menzies. 1. Respiratory and Epidemiology Clinical Research Unit, Montreal Chest Institute, McGill University, Montreal, Canada.
Abstract
BACKGROUND: Recent World Health Organization guidelines recommend the addition of ethambutol (EMB) throughout standardised treatment of new cases of active tuberculosis (TB) in populations with increased prevalence of isoniazid resistance to reduce the risk of creating multidrug resistance. This could expose patients to the risk of blindness. METHODS: We searched Cochrane, Embase and PubMed electronic databases from 1965 to February 2011 for original studies that prospectively followed all patients treated with EMB for active TB, and routinely ascertained the occurrence of visual toxicity using standard methods. Pooled estimates, overall and stratified by major covariates, were calculated using random effects meta-analysis. RESULTS: Pooled cumulative incidence of any visual impairment in all patients was 22.5 per 1000 persons treated with EMB (95%CI 10.2-35), and permanent impairment was 4.3/1000 (95%CI 0.3-9.0). After restricting the analyses to arms in which the average dose was 27.5 mg/kg/day or less and treatment was for 2-9 months, the incidence of any visual impairment was 19.2/1000 (95%CI 5.8-33), and permanent impairment was 2.3/1000 persons (95%CI 0-6.1) treated, as the majority of episodes were reversible. In reversible cases, resolution of impairment occurred after an average of 3 months. CONCLUSIONS: In this review, any visual impairment occurred in 22.5/1000 persons receiving EMB at standard doses for up to 9 months, and permanent impairment in 2.3/1000-an important risk. However, these estimates are imprecise, and the studies were of variable quality and the results heterogeneous. Well-designed prospective studies with repeated measurements of multiple visual parameters that clearly describe the degree of permanent impairment are needed.
BACKGROUND: Recent World Health Organization guidelines recommend the addition of ethambutol (EMB) throughout standardised treatment of new cases of active tuberculosis (TB) in populations with increased prevalence of isoniazid resistance to reduce the risk of creating multidrug resistance. This could expose patients to the risk of blindness. METHODS: We searched Cochrane, Embase and PubMed electronic databases from 1965 to February 2011 for original studies that prospectively followed all patients treated with EMB for active TB, and routinely ascertained the occurrence of visual toxicity using standard methods. Pooled estimates, overall and stratified by major covariates, were calculated using random effects meta-analysis. RESULTS: Pooled cumulative incidence of any visual impairment in all patients was 22.5 per 1000 persons treated with EMB (95%CI 10.2-35), and permanent impairment was 4.3/1000 (95%CI 0.3-9.0). After restricting the analyses to arms in which the average dose was 27.5 mg/kg/day or less and treatment was for 2-9 months, the incidence of any visual impairment was 19.2/1000 (95%CI 5.8-33), and permanent impairment was 2.3/1000 persons (95%CI 0-6.1) treated, as the majority of episodes were reversible. In reversible cases, resolution of impairment occurred after an average of 3 months. CONCLUSIONS: In this review, any visual impairment occurred in 22.5/1000 persons receiving EMB at standard doses for up to 9 months, and permanent impairment in 2.3/1000-an important risk. However, these estimates are imprecise, and the studies were of variable quality and the results heterogeneous. Well-designed prospective studies with repeated measurements of multiple visual parameters that clearly describe the degree of permanent impairment are needed.
Authors: Jinu Han; Min Kwang Byun; Junwon Lee; So Young Han; Jong Bok Lee; Sueng-Han Han Journal: Graefes Arch Clin Exp Ophthalmol Date: 2015-09-07 Impact factor: 3.117
Authors: Payam Nahid; Susan E Dorman; Narges Alipanah; Pennan M Barry; Jan L Brozek; Adithya Cattamanchi; Lelia H Chaisson; Richard E Chaisson; Charles L Daley; Malgosia Grzemska; Julie M Higashi; Christine S Ho; Philip C Hopewell; Salmaan A Keshavjee; Christian Lienhardt; Richard Menzies; Cynthia Merrifield; Masahiro Narita; Rick O'Brien; Charles A Peloquin; Ann Raftery; Jussi Saukkonen; H Simon Schaaf; Giovanni Sotgiu; Jeffrey R Starke; Giovanni Battista Migliori; Andrew Vernon Journal: Clin Infect Dis Date: 2016-08-10 Impact factor: 9.079
Authors: Jonathan P Smith; Neel R Gandhi; N Sarita Shah; Koleka Mlisana; Pravi Moodley; Brent A Johnson; Salim Allana; Angela Campbell; Kristin N Nelson; Iqbal Master; James C M Brust Journal: J Acquir Immune Defic Syndr Date: 2020-01-01 Impact factor: 3.771
Authors: Conor D Tweed; Angela M Crook; Evans I Amukoye; Rodney Dawson; Andreas H Diacon; Madeline Hanekom; Timothy D McHugh; Carl M Mendel; Sarah K Meredith; Michael E Murphy; Saraswathi E Murthy; Andrew J Nunn; Patrick P J Phillips; Kasha P Singh; Melvin Spigelman; Genevieve H Wills; Stephen H Gillespie Journal: BMC Infect Dis Date: 2018-07-11 Impact factor: 3.090