Retinopathy of prematurity: an evaluation of existing screening criteria in Pakistan

Aim To evaluate if broadening the criteria for retinopathy of prematurity (ROP) screening to include babies with gestational age ≥32 weeks and/or birth weight ≥1500 g, would have an impact on the number of babies diagnosed as having ROP. Methods A prospective cohort study was carried out at the Aga Khan University Hospital, Karachi, Pakistan. Infants with gestational age ≤35 weeks or birth weight ≤2000 g born in this hospital from May 2010 to December 2012 were screened for the presence of ROP 4–6 weeks after birth. Subsequent examinations were performed at intervals based on the findings of initial eye examinations. Infants diagnosed as having ROP were treated with argon laser therapy. Neonatal risk factors were also assessed. Cumulative incidence of ROP was calculated for babies falling within and outside current screening criteria. Multivariate logistic regression analysis was performed to examine the predictors of ROP. Results A total of 301 infants were screened: 27 (9%) babies developed ROP, of which 19 had stage 3 ROP or worse. None of the babies falling outside the current screening criteria developed ROP. The incidence of ROP in the infants meeting the current screening criteria was 11.5%. Multivariate logistic regression analysis showed that only gestational age (adjusted relative risk 0.774, 95% CI 0.603 to 0.994) was independently associated with the development of ROP. Conclusions In our population ROP was not seen to occur in infants older than 32 weeks gestational age and/or weighing more than 1500 g.