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Original Investigation |

Validity of a Telemedicine System for the Evaluation of Acute-Phase Retinopathy of Prematurity

Graham E. Quinn, MD, MSCE1; Gui-shuang Ying, PhD2; Ebenezer Daniel, MBBS, MS, PhD2; P. Lloyd Hildebrand, MD3; Anna Ells, MD, FRCS4; Agnieshka Baumritter, MS1; Alex R. Kemper, MD, MPH, MS5; Eleanor B. Schron, PhD, RN6; Kelly Wade, MD, PhD, MSCE7 ; for the e-ROP Cooperative Group
[+] Author Affiliations
1Division of Pediatric Ophthalmology, The Children’s Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine, Philadelphia
2Department of Ophthalmology, Scheie Eye Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia
3Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City
4University of Calgary, Calgary, Alberta, Canada
5Program on Pediatric Health Services Research, Duke Clinical Research Institute, Duke University, Durham, North Carolina
6Division of Extramural Research, National Institutes of Health, Bethesda, Maryland
7Department of Pediatrics, Division of Neonatology, The Children’s Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine, Philadelphia
JAMA Ophthalmol. 2014;132(10):1178-1184. doi:10.1001/jamaophthalmol.2014.1604.
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Importance  The present strategy to identify infants needing treatment for retinopathy of prematurity (ROP) requires repeated examinations of at-risk infants by physicians. However, less than 10% ultimately require treatment. Retinal imaging by nonphysicians with remote image interpretation by nonphysicians may provide a more efficient strategy.

Objective  To evaluate the validity of a telemedicine system to identify infants who have sufficiently severe ROP to require evaluation by an ophthalmologist.

Design, Setting, and Participants  An observational study of premature infants starting at 32 weeks’ postmenstrual age was conducted. This study involved 1257 infants with birth weight less than 1251 g in neonatal intensive care units in 13 North American centers enrolled from May 25, 2011, through October 31, 2013.

Interventions  Infants underwent regularly scheduled diagnostic examinations by an ophthalmologist and digital imaging by nonphysician staff using a wide-field digital camera. Ophthalmologists documented findings consistent with referral-warranted (RW) ROP (ie, zone I ROP, stage 3 ROP or worse, or plus disease). A standard 6-image set per eye was sent to a central server and graded by 2 trained, masked, nonphysician readers. A reading supervisor adjudicated disagreements.

Main Outcomes and Measures  The validity of grading retinal image sets was based on the sensitivity and specificity for detecting RW-ROP compared with the criterion standard diagnostic examination.

Results  A total of 1257 infants (mean birth weight, 864 g; mean gestational age, 27 weeks) underwent a median of 3 sessions of examinations and imaging. Diagnostic examination identified characteristics of RW-ROP in 18.2% of eyes (19.4% of infants). Remote grading of images of an eye at a single session had sensitivity of 81.9% (95% CI, 77.4-85.6) and specificity of 90.1% (95% CI, 87.9-91.8). When both eyes were considered for the presence of RW-ROP, as would routinely be done in a screening, the sensitivity was 90.0% (95% CI, 85.4-93.5), with specificity of 87.0% (95% CI, 84.0-89.5), negative predictive value of 97.3%, and positive predictive value of 62.5% at the observed RW-ROP rate of 19.4%.

Conclusions and Relevance  When compared with the criterion standard diagnostic examination, these results provide strong support for the validity of remote evaluation by trained nonphysician readers of digital retinal images taken by trained nonphysician imagers from infants at risk for RW-ROP.

Trial Registration  clinicaltrials.gov Identifier:NCT01264276

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