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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ROP occurs when abnormal blood vessels grow and spread throughout the retina, the tissue that lines the back of the eye. In addition, this trial led to innovations in the design and organization of randomized interventional trials that have gained wide acceptance and application in other fields.

A lack of standardized terminology and grading, rkp especially a lack of comparative clinical trial data, led to the reluctance of many clinicians to embrace this treatment. Stage IV — Partially detached retina. 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 dop of amblyopia, cataracts, and other vision problems in children in addition to ROP.

The purpose of the proposed study is to examine the long-term structural and functional effects of cryotherapy as a treatment for severe retinopathy of prematurity ROP. 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.

It is possible that laser may be associated with less peripheral visual field constriction, less pathological myopia, and lower risk of macular retinopathy, 1314 but it is unlikely that a large-scale comparative trial would be feasible because of the almost universal adoption of laser photocoagulation. The most effective proven treatments for ROP are laser therapy or cryotherapy.

There are approximately 3. Clinical investigations in ROP confront major barriers to study related to the age and relative immaturity of the subjects, fryo acute nature and rapid course of the disease, and the associated medical and developmental consequences of prematurity. Natural History Control Outcomes.

Sign in to access your subscriptions Sign in to your personal account. The influence of a clinical trial on the broader management of patients is the ultimate measure of the study’s impact.

Copyright American Medical Association. This cohort will likely never be reproduced because as a rule severe ROP is universally treated at the present time.


In addition, a more complete evaluation of visual function dryo be conducted at age 9 years, through assessment of monocular contrast sensitivity, monocular contrast sensitivity, monocular color vision, and stereopsis, and at age 10 years, through measurement of the extent of the visual field by Goldmann perimetry.

Most other complications of ROP were also more frequent in control eyes, including corneal clouding, cataract, and glaucoma.

Download PDF Top of Article Study goals Study design Study results Study conclusions and recommendations Influence of the study on subsequent clinical investigations Influence of the study on clinical practice in management of rop Article Information References.

Stage II — Moderately abnormal blood vessel growth. About 14,—16, of these infants are affected by some degree of ROP. In the initial phase of the study, eyes with 5 contiguous or 8 total cfyo hours of stage 3 plus ROP, in infants with birth weights less than g.

Masked interpretation of fundus photographs taken at 3 and 12 months was chosen as the primary end point of the study. The paired analysis provides a strong control for environmental covariables in these complex cases with many factors that might influence visual outcomes.

Create a free personal account to download free article PDFs, sign up for alerts, and more. 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. The use of a separate data safety monitoring committee with authority to prematurely halt the trial if treatment success could be determined with less than complete enrollment was a relatively new innovation at cryoo time of this trial, although it has become routine now.

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

The initial conclusion of the expedited early publications and 3- and month primary outcomes is that cryotherapy for threshold ROP is safe and effective when used in one eye. Asymmetrical patients assigned to the untreated control group also might suffer if treatment was beneficial. The disease improves and leaves no permanent damage in milder cases of ROP. When this happens, no further treatments may be needed, since a partial detachment may remain the same or go away without treatment.

Ideally, one would select perfectly matched cases to randomize cro an interventional trial. Stage I — Mildly abnormal blood vessel growth. Create a personal account to register for email alerts with links to free full-text articles.

Based on the preliminary data, follow- up to age 42 months during Phase II of the study indicated that cryotherapy reduced the ropp of unfavorable structural outcome by Randomizing one of symmetrically involved eyes also allows analysis based on discordant rcyo between the two eyes, which would otherwise be assumed to have similar prognosis. Scientists believe that the periphery of the retina then sends out signals to other areas of the retina for nourishment. But if a baby is born prematurely, before these blood vessels have reached the edges of the retina, normal vessel growth may stop.


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.

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

Several complex factors may be responsible for the development of ROP. The present study proposes to follow patients in the randomized group and a relatively small subgroup 67 of potentially high risk patients from the Natural History study through age 10 years, to determine whether the reduction in the benefit of cryotherapy seen between ages 12 and 42 months continues into mid-childhood.

It is difficult to overestimate the impact of this well-designed trial in taking the concept of ablative treatment from controversial to near universal acceptance within a short period of time.

Our website uses cookies to enhance your experience. The abnormal blood vessels grow toward the center of the eye instead of following their normal growth pattern along the surface of the retina. This involves placing a silicone band around the eye and tightening it. The difficulty in precisely measuring visual acuity and the effect of nonocular visual pathway abnormalities in these children limit the interpretation of vision as a secondary outcome.

Create a free personal account to make a comment, download free article PDFs, sign up for alerts and more. We anticipate that the study subjects will continue to be measured and data continue to be reported as the cohort reaches visual maturity and adulthood. Formally, trials must be judged first on the ability to achieve the prospective goals of the investigation, generally a question of benefit and safety of the intervention being tested.

The screening recommendations were implemented, and most children in neonatal units had access to treatment within a short period of time following the initial publication of the study.

As a result, new abnormal vessels begin to grow.