Hyperglycemia may increase risk of eye disorder in premature infants

Premature infants with hyperglycemia, or high blood sugar, may be at an increased risk in the first month of life for retinal detachment and blindness, say researchers from the Johns Hopkins Children's Center.

The study, published in the May issue of the Journal of Perinatology, is believed to be the first to demonstrate a link between retinopathy of prematurity (ROP), a condition marked by abnormal blood vessel growth in the retina, and hyperglycemia, which occurs in about 45 percent of all infants weighing less than 2.2 lbs.

The Johns Hopkins researchers found that infants with ROP had higher daily blood sugar levels compared to healthy infants of the same gestational age and birth weight, and determined that with each 10 mg/dl increase of average monthly glucose levels, ROP risk almost doubled.

"We were not surprised by these study results, especially since ROP bears many similarities to adult diabetic retinopathy, a related retinal disorder in which hyperglycemia has already been shown to be a major risk factor," said the study's senior author, Christoph U. Lehmann, M.D., a Children's Center neonatologist. "If glucose is truly connected to the pathogenesis of ROP, as our study finds, then we may be able to reduce the risk using tighter glucose control in the first few months of life."

Hopkins researchers examined the charts of 16 preemies born at The Johns Hopkins Hospital between 1992 and 1997 who developed ROP, and compared them to 31 healthy infants based on gestational age, birth weight and year of birth.

Initial ophthalmologic screening was performed on all infants within six weeks of birth. During the first month of life, an average of five glucose measurements were taken per day to calculate daily maximum, minimum, mid-point and average values for each individual infant.

ROP infants had higher glucose maximums, averages and mid-point levels than control infants. Their daily glucose levels also

Contact: Jessica Collins
Johns Hopkins Medical Institutions

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