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Drug therapy shows significant benefit in treating a leading cause of childhood blindness
Date:2/16/2011

an get wonderful outcomes."

Mintz-Hittner, an attending physician at Children's Memorial Hermann Hospital and the Robert Cizik Eye Clinic, stressed that timing is critical with this drug therapy. If administered too early, in stages 1 and 2 of the disease, it can cause retinal dystrophy. Given too late, in stages 4-5 of the disease, the drug can accelerate retina detachment.

"In that window, as the abnormal vessels begin to proliferate but before the retinal begins to detach, that's when you want to treat," Mintz-Hittner said.

In addition to the significantly reduced recurrence rate for patients with retinopathy of prematurity in zone I, Mintz-Hittner said, compared with conventional laser therapy, the drug therapy appears to do the best job preserving vision. Plus, when administered, there is no need to intubate the baby and there is a faster recovery.

"Our first available treatment for babies with retinopathy of prematurity was cryotherapy," Mintz-Hittner said. "It was very painful and it wiped out all posterior ocular layers. The visual field was decreased and myopia or nearsightedness occurred. It was a long procedure 2 to 3 hours requiring intubation. With laser treatment, you still had to intubate, which could cause major setbacks for the baby, and field loss and myopia still occurred, but it was less painful and only destroyed the inner retinal layers."

"With this drug therapy, we use a few drops of anesthetic to numb the eye. We take a syringe with a tiny needle and administer a small amount of the drug directly into the eye. The whole process takes two to three minutes, and you begin to see results within 24 hours," she said. "The abnormal vessels virtually disappear and then normal vessels begin to grow out again. The field of vision is preserved and myopia is less."

The results of the study were so promising that Children's Memorial Hermann Hospital has discontinued the use of conventional laser ther
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Contact: Meredith Raine
Meredith.Raine@uth.tmc.edu
713-500-3030
University of Texas Health Science Center at Houston
Source:Eurekalert  

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