Related Experiment Video
Updated: Aug 29, 2026

Monitoring Dynamic Growth of Retinal Vessels in Oxygen-Induced Retinopathy Mouse Model
Published on: April 2, 2021
Risk factors for retinopathy of prematurity requiring photocoagulation
1Department of Ophthalmology, Hyogo Prefectural Amagasaki Hospital, Hyogo, Japan. mikeda@osaka-u.ac.jp
Insights
Infection, indicated by C-reactive protein (CRP), increases the risk of retinopathy of prematurity (ROP) needing treatment. Blood transfusions and rescue surfactant also elevate the need for photocoagulation in preterm infants.
Area of Science:
- Neonatal care and ophthalmology.
- Perinatal medicine and critical care.
Background:
- Retinopathy of prematurity (ROP) is a significant cause of visual impairment in preterm infants.
- Birthweight and gestational age are established risk factors for ROP, but other factors also contribute.
Purpose of the Study:
- To identify risk factors beyond birthweight and gestational age for ROP requiring photocoagulation in very low birthweight infants (BW < 1500 g).
Main Methods:
- A retrospective analysis of 45 eyes with ROP was conducted.
- Infants were categorized into three groups based on the extent of photocoagulation treatment received.
- Maternal and neonatal factors were analyzed using multiple logistic regression.
Main Results:
- Increased duration of infection, indicated by elevated C-reactive protein (CRP), was a significant risk factor for ROP requiring photocoagulation.
- The number of days of infection and blood transfusions were significant predictors of ROP severity.
- Use of rescue surfactant was strongly associated with the need for extensive photocoagulation.
Conclusions:
- Routine monitoring of CRP levels is recommended for preterm infants to assess infection risk.
- Blood transfusions and rescue surfactant use are associated with an increased probability of requiring photocoagulation for ROP.
Purpose:
To analyze risk factors other than birthweight (BW) and gestational age for retinopathy of prematurity (ROP) requiring photocoagulation in infants (BW<1500 g).
Methods:
We divided 45 eyes with ROP into three groups (A, without photocoagulation; B, with <6 clock hours photocoagulation; C, with > or =6 clock hours photocoagulation) and analyzed maternal and neonatal factors by multiple logistic regression.
Results:
Among 13 factors, the number of days of infection, defined as C-reactive protein (CRP) greater than 1.0 mg/dl, was a significant risk between groups A and B+C [Odds ratio (OR), 1.549; 95% Confidence interval (CI), 1.008-2.381; P=0.046]. Among six after-birth factors, the number of days of infection (OR, 1.404; 95% CI, 1.023-1.928; P=0.036) was significant between groups A and B+C, and the number of blood transfusions (OR, 4.959; 95% CI, 1.002-24.54; P=0.050) and use of rescue surfactant (OR, 413.9; 95% CI, 1.163-147306; P=0.044) were significant between groups B and C.
Conclusions:
CRP should be routinely monitored while observing the progress of preterm infants. The probability of requiring photocoagulation increased in infants who received a blood transfusion or rescue surfactant.
Related Concept Videos
Diabetic Retinopathy
Photoreceptors and Visual Pathways

