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Acute retinal necrosis: a case series with clinical features and treatment outcomes
Authors:Joanne L Sims FRANZCO    Jonathan Yeoh FRANZCO  and Richard J Stawell FRANZCO
Institution:Ocular Immunology Clinic, The Royal Victorian Eye and Ear Hospital, Melbourne, Victoria, Australia
Abstract:Purpose:  To determine clinical features, viral aetiology and treatment outcomes of eyes with acute retinal necrosis (ARN).
Methods:  Retrospective, interventional, non-comparative case series.
Results:  Twenty-two patients (23 eyes) were identified between 1996 and 2007. Varicella zoster virus was the causative agent in 12 patients (nine confirmed by polymerase chain reaction), herpes simplex virus type 1 in six (five polymerase chain reaction-confirmed) and unknown in three patients. Five patients had documented herpes zoster infection in the month prior to the onset of ARN. Twelve patients (55%) had identifiable (clinical or subclinical) immune dysfunction. At 6 months, 3 out of 15 eyes (20%) maintained vision 6/12 or better and 7 (47%) were 6/60 or worse. Median final VA was 6/60. Nine eyes developed retinal detachment and two-thirds of these had received prior barrier laser. Poor prognostic factors for severe visual loss by univariate analysis were male gender ( P  = 0.019), and the development of retinal detachment ( P  = 0.05). Delay between onset of symptoms and diagnosis was associated with moderate visual loss ( P  = 0.018). Barrier laser did not reduce the risk of retinal detachment.
Conclusions:  Acute retinal necrosis still has poor visual prognosis. Early diagnosis and initiation of treatment may improve outcome.
Keywords:acute retinal necrosis  barrier laser  herpetic  retinal detachment
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