Statistics from Altmetric.com
There is interest in reducing the criteria for retinopathy of prematurity (ROP) screening below the current guidelines of less than 32 weeks gestation and birth weight less than 1501 g.
Here we present three babies conceived by in vitro fertilisation (IVF) who were close to the limits of the current criteria and would not be identified should such changes be made.
A female baby, twin 2 of an IVF pregnancy, born at 31+4 weeks with a birth weight of 1.27 kg developed bilateral stage 3 ROP with mild vascular changes (pre-plus disease), but did not reach the threshold for treatment.
A male baby, twin 1 of an IVF pregnancy, born at 31+5 weeks with a birth weight of 1.245 kg developed ROP that although sub-threshold was considered to require treatment. This was undertaken at 44 weeks postmenstrual age (PMA) and he responded well to laser therapy, with regression in both eyes.
A female baby, triplet 2 of an IVF pregnancy, born at 32 weeks with a birth weight of 1.31 kg developed bilateral stage 3 ROP. There was minimal vascular congestion and the retinopathy resolved spontaneously.
Babies born after assisted conception are more likely to be born preterm and of low birth weight.1 This appears to be the result of increased numbers of multiple births with assisted conception (23% compared to 1% of those conceived naturally)2; both birth weight and gestational age fall in direct relation to the multiplicity of the pregnancy.
Watts and Adams reported that IVF infants with ROP had lower gestational age and birth weight than those IVF infants who did not develop ROP.5 They also reported that assisted conception using IVF appears to be a risk factor for development of threshold ROP. Additionally, they reported a non-statistical trend for the IVF infants with stage 3 ROP to have a higher gestational age and birth weight than the non-IVF infants with stage 3 disease.
Blumenfeld et al,6 in a large series, reported no difference in the incidence or severity of ROP between singleton and multiple gestation babies.
The different outcomes of assisted conception have been postulated to be because the gametes are exposed to a variety of drugs, physically manipulated, nurtured in potentially hazardous conditions, and perhaps placed in an inappropriate uterine environment.4
Retinopathy of prematurity may affect larger and more mature babies who are conceived by IVF than those who are not. The three babies described here all developed ROP despite gestational ages greater than 31 weeks and birth weights greater than 1200 g. If the criteria for ROP screening are changed in the future, it is possible that some babies who develop ROP might fall outside the guidelines for screening.