Arch Ophthalmol. Aug;(8) Multicenter Trial of Cryotherapy for Retinopathy of Prematurity: ophthalmological outcomes at 10 years. Cryotherapy . The most effective proven treatments for ROP are laser therapy or cryotherapy. Laser therapy “burns away” the periphery of the retina, which has no normal. are discussed. Retinopathy of prematurity (ROP) is a leading cause of childhood blindness.’2 Cryotherapy was first used in the treatment of this condition in the.

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The method of treatment crto in the study, peripheral retinal transscleral cryotherapy, rlp the form of retinal ablation most widely used at that time for treatment for ROP, and virtually all of the earlier clinical reports had used cryotherapy.

By all these measures, CRYO-ROP has been highly successful, both in achieving its formal goals as well as developing information to support a new understanding of ROP and the development of visual impairment in young children.

Evaluating the Cryotherapy for Retinopathy of Prematurity Study (CRYO-ROP)

If treatment for ROP does not work, a retinal detachment may develop. Scientists believe that the periphery of the retina then sends out signals to other areas of the retina for nourishment. When, as anticipated by this study design, it became apparent that the benefit of treatment was significantly greater than initially estimated, the data safety monitoring committee exercised its prerogative, and subject recruitment and randomization was stopped.

In the study, non-physician staff in the NICU were trained to take the photos, which were made available to trained image readers, who evaluated whether the babies needed to be referred for potential treatment. What is the best measure of the success of a clinical trial?

Other measurements of visual function also showed significant benefit in treated eyes, including contrast sensitivity and visual fields. Stage IV — Partially detached retina. dryo

CRYO-ROP – What does CRYO-ROP stand for? The Free Dictionary

Thus, even before the publication of the initial manuscript, many clinicians had adopted screening and treatment guidelines similar to those used in the cry in anticipation of favorable results. The CRYO-ROP study was also very influential among ophthalmologists managing pediatric vision problems in adopting the Teller Acuity Card procedure, which is now used in many pediatric eye clinics to quantify visual function in preverbal children.


These results were reported in the initial manuscripts published from the study. Few studies have so influenced the clinical care of ophthalmic disease and been so croy accepted within the clinical community in such a short period.

Data comparing cryotherapy with laser photocoagulation for ROP are limited. Create a free personal account to make a comment, download free article PDFs, sign up for alerts and more. The Teller Acuity Card procedure and similar forced preferential looking grating tests, while not perfect proxies for optotype visual acuity, have contributed to the clinical treatment of amblyopia, cataracts, and other vision problems in children in addition to ROP. In addition, a more complete evaluation of visual function will be conducted at age 9 years, through assessment of monocular contrast sensitivity, monocular contrast sensitivity, monocular color vision, and stereopsis, cyro at age 10 years, through measurement of the extent of the visual field by Goldmann perimetry.

Based on the preliminary data, follow- up to age 42 crho during Phase II of the study indicated that cryotherapy reduced the incidence of unfavorable structural outcome by This allowed standardization of interpretation and masking but was limited by the technical difficulty of photographing these young infants. The action of the data safety monitoring committee to terminate enrollment early due to statistically relevant early analysis, in one of the first instances of its kind in an ophthalmology clinical trial, demonstrated the statistical and ethical value of this approach to clinical trials.

Many other secondary outcomes have been reported in the publications of study data. Long-term measurement of refractive error suggests that both treated and untreated eyes with severe ROP have a high risk for high myopia. However, in some instances, physicians may recommend treatment to try to prevent further advancement of the retinal detachment stage V. Copyright American Medical Association. Create a free personal account to access your subscriptions, sign up for alerts, and more.

Inscientists funded by the National Institutes of Health determined that the relatively high levels of oxygen routinely given to premature infants at that time were an important risk factor, and that reducing the level of oxygen given to premature babies reduced the incidence of ROP.


Not all babies respond to ROP treatment, and the disease may get worse.

Results of U.S. randomized clinical trial of cryotherapy for ROP (CRYO-ROP).

Measurement of visual function of children with associated developmental, neurological, and ophthalmic complications of their premature birth is very difficult and complex.

Ablative treatment modalities have evolved as well, and currently laser retinal ablation is far more frequently used than cryotherapy, although the findings of the CRYO-ROP study are still the primary evidence used to support ablative treatment. Some crho who develop stage III improve with no treatment and eventually develop normal orp. Clinical investigations in ROP confront major barriers to study related to the age and relative immaturity of the subjects, the acute nature and rapid course of the disease, and the associated medical and developmental consequences of prematurity.

About 90 percent of all infants with ROP are in the milder category and do not need treatment. Cryotherapy for Retinopathy of Prematurity Cooperative Group. However, in a small number of babies, ROP worsens, sometimes very rapidly. This causes a retinal detachment. Many children who develop stage I improve with no treatment and eventually develop normal vision.

But if a baby is born prematurely, before these blood vessels have reached the edges of the retina, normal vessel growth may stop. Although the exact rate of reduction in unfavorable outcomes has varied depending on the length of follow-up and type of outcome measured, the CRYO-ROP study has been very successful in demonstrating the clinically relevant benefit of treatment in both anatomical and functional outcomes.

This keeps the vitreous gel from pulling on the scar tissue and allows the retina to flatten back down onto the wall of the eye. Asymmetrical patients assigned to the untreated control group also might suffer if treatment was beneficial.

Infants who have had a sclera buckle need to have the band removed months or years later, since the eye continues to grow; otherwise they will become nearsighted. Cryotherapy for active retinopathy of prematurity.