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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Rkp series, mostly from Japan in the s and early s, supported the concept of peripheral retinal ablation for ROP during the acute phase, prior to the development of retinal detachment and retrolental fibroplasia. Transscleral laser photocoagulation has also been reported.

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

Patient Selection and Randomization. The most important early visual function outcome reported was visual measurement using forced preferential looking tests of grating resolution Teller Acuity Card procedure.

Long-term assessment of ocular fundus findings reported over the length of the study have also been very useful in understanding cryl lifelong anatomical issues related to ROP.

However, some ctyo presented with asymmetric involvement, requiring a different randomization scheme, randomizing to treatment or no treatment in the single randomized eye. Despite the evolution of better methods of peripheral ablation, with cryotherapy having been replaced nearly completely by laser photocoagulation, this study marks the point at which the treatment of ROP became data-driven and when the application of systematic screening and treatment for ROP became the standard of care in the clinical practice of neonatology.

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A lack of standardized terminology and grading, and especially a lack of comparative clinical trial data, led to the reluctance of many clinicians to embrace this treatment. This causes a retinal detachment. 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.

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

The early results of the trial also showed what had become apparent clinically to the ophthalmologists with experience with cryotherapy: Patients were recruited from admissions to the participating centers, potentially introducing a bias due to their tertiary nature and referral patterns. Stage I — Mildly abnormal blood vessel growth. When a baby is born full-term, the retinal blood vessel growth is mostly complete The retina usually finishes growing a few weeks to a month after birth.


However, this was the first major multicenter clinical trial to use a standardized procedure, including masked examiners and standardized presentation of gratings. 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. Long-term results of cryotherapy for active stages of retinopathy of prematurity. This data and safety monitoring committee, composed of individuals with no other connection to the study, was empowered to monitor data during the recruitment phase and, if necessary, stop recruitment and complete data analysis prematurely if statistical analysis suggested that the goal of the study determining benefit of treatment could be reached with fewer than the planned number of eyes randomized or if other significant safety or ethical concerns existed.

Influence of the study on subsequent clinical investigations.

Some infants who develop stage III improve with no treatment and eventually develop cfyo vision. Purchase access Subscribe to JN Learning for one year. This information was developed by the National Eye Institute to help patients and their families search for general information about retinopathy of prematurity ROP.

Not all babies who are premature develop ROP. The study found that this telemedicine approach to identifying severe ROP was about as accurate as regular examinations by an ophthalmologist. The abnormal blood vessels grow toward the center of the eye instead of following their normal growth pattern along the surface of the retina. Ethical concerns also complicated the development of this study design.

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The most effective proven ccryo for ROP are laser therapy or cryotherapy. Follow-up to age 12 months indicated that cryotherapy reduced the incidence of unfavorable structural outcome by Abstract Vryo Institution Related projects Comments. Download PDF Top of Article Study goals Study design Study results Study conclusions dop recommendations Influence of the study on subsequent clinical investigations Influence of the study on clinical practice in management of rop Article Information References.

Register for email alerts with links to free full-text articles Access PDFs of free articles Manage your interests Save searches and receive search alerts. The very high completion rate of 5- and year follow-up examinations for the study, the development of the subjects to the point at which more sophisticated visual function tests can be done, and the time elapsed from the initial treatment have allowed the study to achieve this long-term descriptive goal.


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

Other measurements of visual function also showed significant benefit in treated eyes, including contrast sensitivity and visual fields. This cohort will likely never be reproduced because as a rule severe ROP is universally treated at the present time. Purchase access Subscribe now. 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 make a comment, download free article PDFs, sign up for alerts and cro. These infants are at a much higher risk for ROP. This important finding led to the development of the ETROP and revised treatment recommendations for earlier treatment of patients with involvement of zone 1. Because of this concern and others related to subject safety and ethical oversight, a special oversight committee was established within the study. The differences in treatment outcome among the eyes with different stages of ROP, especially zone 1 vs zone 2, have also been an important finding in this study.

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

Both laser treatment and cryotherapy destroy the peripheral areas of the retina, slowing or reversing the abnormal growth of blood vessels. The difficulty in precisely measuring visual acuity and the effect of nonocular visual pathway crjo in these children limit the interpretation of vision as a secondary outcome. The interpretation of the results of this study is limited to the benefit of treatment at the defined threshold.

However, in some instances, physicians may recommend treatment to try to prevent further advancement of the retinal detachment stage V.

Privacy Policy Terms of Use. Stage IV — Partially detached retina. As for vision, cryotherapy reduced the incidence of unfavorable resolution acuity outcome by Unfortunately, the treatments also destroy some side vision. This disorder—which usually develops in both eyes—is one of the most common causes of visual loss in childhood and can lead to lifelong vision impairment and blindness.