To assess the utility of the first or second examinations for retinopathy of prematurity (ROP) in a medium-risk cohort of infants and to propose an optimization to the current ROP screening guidelines. Retrospective consecutive study. Infants screened for ROP between January 2017 and August 2023 at three different tertiary-level care neonatal intensive care units. The analysis focused on patients who did not meet criteria for micro or nanoprematurity (those born at ≥27 weeks and weighing ≥800 grams). The primary outcomes included the rates of ROP and treatment-warranted ROP (TW-ROP), the presence of TW-ROP at the first or second inpatient examinations, the number of inpatient examinations performed before the first ROP diagnosis, and the overall number of inpatient examinations performed. A total of 2,004 neonates were screened for ROP, of which 1,125 (56.1%) met the inclusion criteria. Of those patients, 237 (21.1%) had ROP. Eleven infants (1.0%) required treatment for active disease. The median postmenstrual age (PMA) at first ROP diagnosis was 35.3 weeks (IQR, 33.7-37 weeks; range, 30.3-46.7 weeks). The median PMA at stage 3 diagnosis was 39.3 weeks (IQR, 38.3-41.2 weeks; range, 35.1-44.4 weeks). The median PMA at first treatment was 39.6 weeks (IQR, 35.8-43.3 weeks; range, 35.3-49.6 weeks). The median number of inpatient examinations was 2.0 (IQR, 1-4 exams) for traditional screening, 1.0 (IQR, 1-3) after eliminating the first ROP inpatient examination, and 1.0 (IQR, 1-2) after eliminating the first and second ROP examinations (p<0.001). No patients were diagnosed with stage ≥3 nor met type 1 ROP treatment criteria at the first or second inpatient examination (100% sensitivity for TW-ROP). In this cohort, starting exams at 34 weeks PMA would be estimated to save 30.6% of the inpatient examinations. In infants not meeting criteria for micro and/or nanoprematurity, there was no type 1 ROP at either of the first two inpatient examinations. We propose an amendment algorithm (FIRST-ROP) in which ROP exams start at 34 weeks PMA for neonates born at ≥27 weeks gestational age and ≥800 grams.
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