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Retinopathy of Prematurity: Laser, Anti- VEGF,Surgery & Others

Retinopathy of Prematurity: Laser, Anti- VEGF,Surgery & Others. Dr. Mangat R. Dogra Professor of Ophthalmology Advanced Eye Centre PGIMER, Chandigarh. No financial disclosure. Introduction.

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Retinopathy of Prematurity: Laser, Anti- VEGF,Surgery & Others

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  1. Retinopathy of Prematurity: Laser, Anti-VEGF,Surgery & Others Dr. Mangat R. Dogra Professor of Ophthalmology Advanced Eye Centre PGIMER, Chandigarh No financial disclosure

  2. Introduction Retinopathy of prematurity (ROP) is the leading cause of childhood blindness worldwide. Becoming a major public health concern in developing countries like India. (New and emerging cause of blindness) Blindness due to ROP is potentially preventable. A large number of babies in our country are presenting late with bilateral, irreversible blindness due to absence or delayed screening.

  3. Predicting ROP blindness according to Infant mortality rates. Gilbert C. Early Hum Dev 2008;84 (2):77-82.

  4. ROP in India • Incidence of ROP: 38% – 47. 3 % in low birth weight infants. • Charan R, Dogra MR, Gupta A, Narang A. Indian J Ophthalmol 1995; 43:123-26. • Gopal L et al. Indian J Ophthalmol 1995; 43:50-61. • Live births: 26 million /year • Incidence of Low birth weight (< 2000g)- 8.7% • 2 million newborns are at risk for developing ROP. • National Neonatalogy Forum of India. National Neonatal Perinatal Database. Report New Delhi 2005

  5. Indian scenario of ROP 1995 : Charan R ,Dogra MR et al IJO 43:123-126;1995 first prospective study (<1700g) incidence of 47.27% 1995 : Gopal etal ; (<2000g) 38% 1996 : Rekha etal ; (<1500g) 47.3% 1996 : Maheshwari etal; (<1500g) 20% 2001 : Varughese etal; (<1500g) 51.89% 2009 : Chaudhari etal; (<1500g) 22.30% 2012 : Hungi B etal; (<2000g) 41.5%

  6. Implications for screening • The American screening guidelines • Babies ≤ 1500g birth weight or ≤ 30weeks gestational age • Selected infants with a birth weight 1500 -2000 g or gestational age > 30 weeks be screened at the discretion of the attending neonatologist. • Pediatrics 2013;131(2) • Indian Screening guidelines • Infants weighing < 1750grams or < 34 weeks of gestation. • Heavier (1750-2000g) or older babies (34-36 weeks) may be screened depending upon the attending risk factors like mechanical ventilation, prolonged oxygen therapy, hemodynamic instability or adverse respiratory or cardiac disease profile. National neonatology forum. Clinical practice guidelines 2010.

  7. Why screen for ROP • Premature child is not born with ROP • Screening aims to identify treatable stage • Narrow window for screening and treatment • Delay cause blindness or visual impairment • Medico-legal implications • Economic and social burden of childhood blindness is immense

  8. Aggressive Posterior ROP The keys to diagnosis: • Identification of plus disease • Location in zone 1 or posterior zone 2 • Subtle neovascular findings at the junction without any stages of ROP These cases progress rapidly and directly to retinal detachment . ICROP revisited: Arch Ophthalmol.2005;1239:991-99

  9. Sanghi G, Dogra MR et al .Aggressive posterior retinopathy of prematurity in Asian Indian babies:Spectrum of Disease and Outcome After Laser Treatment. Retina 2009:29;1335-39 Jalali S, Kesarwani S, Hussain A. Outcomes of a protocol-based management for zone 1 retinopathy of prematurity: the Indian Twin Cities ROP Screening Program report number 2. Am J Ophthalmol. 2011 Apr;151(4):719-724 Shah PK, Narendran V, Kalpana N Aggressive posterior retinopathy of prematurity in large preterm babies in South India. Arch Dis Child Fetal Neonatal Ed. 2012 Sep;97(5):F371-5.

  10. The mean birth weight and gestational age in APROP

  11. Current treatments of ROP • Peripheral retinal ablation with laser delivered through laser indirect ophthalmoscope (LIO) is a gold standard in ROP treatment • Anti-VEGF is emerging therapy for selective cases of ROP • Vitreoretinal surgery is required in stage 4 and 5 ROP

  12. Rationale for laser treatment • VEGF is stimulus for abnormal vessels which comes from avascular retina • Ablate the avascular retina between ora and ridge to reduce VEGF

  13. Laser Treatment of ROP Laser treatment earlier than threshold ROP has shown better results & outcome after ETROP Study Arch Ophthalmol.121:1684-1696; 2003

  14. ETROP Recommendations Arch Ophthalmol. 121:1684-96;2003

  15. Plus disease • If pupil does not dilate suspect tunica vasculosa lentilsand plus disease.

  16. Plus disease • Plus disease means at least 2 quadrants of dilation and tortuosity of the posterior retinal blood vessels

  17. Preplus & Plus disease

  18. Laser treatment • Delivered in confluent pattern (less than half burn width apart) • Around 90% attain favourable outcome Laser treatment for ROP: evolution in treatment technique over 15years Hurley et al. Retina 26: S16-7; 2006

  19. Laser treatment Possible inside the incubator through the slopping transparent wall in extremely unstable premature infants Dogra etal Ophthalmic Surg Lasers Imaging 39:350-352;2008

  20. Frequency doubled Nd: YAG (532 nm green) versus diode laser (810 nm) in treatment of ROP • Favorable outcome in 97% with 532 nm laser versus 96.9% in diode laser group. • Treatment possible in eyes with TVL, vitreous or preretinal hemorrhage and without inducing any cataract, anterior segment ischemia or hyphema . Sanghi G, Dogra MR, Vinekar A,Gupta A. Frequency doubled Nd: YAG (532 nm green) vs diode laser(810 nm ) in treatment of retinopathy of prematurity Br J Ophthalmol 94;1265-1265 : 2010

  21. Laser treatment of APROP • Delivered through LIO in confluent pattern (less than half burn width apart) with in 24-48 hours of diagnosis • Around 55% to 84% attain favourable outcomein reported series Sanghi G, Dogra M R et al. Aggressive posterior retinopathy of prematurity in Asian Indian babies:Spectrum of Disease and Outcome After Laser Treatment. Retina 2009:29;1335-39

  22. APROP in posterior zone 1 with mat like proliferation

  23. Unfavourable outcome after laser

  24. Risk factors for RD after laser treatment of APROP Sanghi G, Dogra M R et al.Aggressive posterior retinopathy of prematurity: risk factors for RD despite confluent laser photocoagulation. Am J Ophthalmol. 2013: Jan;155(1):159-164 Gestational age less than 29 weeks Posterior zone 1 APROP Pre-retinal hemorrhages Need for repeat laser treatment New onset fibrovascular proliferation after laser treatment

  25. Indications for ROP surgery • Progression despite laser treatment • Delayed or no screening • Stage 4A, 4b and stage 5 ROP • Bilateral cases

  26. Current surgical approaches in ROP • Scleral buckle is rarely performed • Lens sparing vitrectomy • Lensectomy & vitrectomy

  27. Management of stage 4A and 4B ROP • ? Observation if < 4 clock hrs of elevation • Lens sparing vitrectomy has shown reattachment in 60 % to 85% eyes Bende P, Gopal L et al. Indian J Ophthalmol 57:267-271;2009 Lakhanpal et al. Arch Ophthalmol 124: 675-679;2006 Capone A Jr, Trese MT. Ophthalmology 108:2068-2070;2001

  28. Lens sparing vitrectomy (LSV) • Most important recent innovation • Ideal for stage 4A and 4B ROP • Both 2 or 3 port LSV is possible • 23G and 25G LSV are preferred at present

  29. ROP stage 5 : Total retinal detachment

  30. Management of stage 5 ROP • Lensectomy and vitrectomy in these cases • Reattachment in some eyes (< 1/3) • Functional results extremly poor and dismal ETROP Study results: Arch Ophthalmol 124;24-30:2006 Arch Ophthalmol 129;1175-1179:2011 Shah et al. Eye 23;176-180:2009 Gopal et al. IJO 48:101-106; 2000

  31. Bevacizumabmonotherapy • Avastin monotherapy showed a significant benefit for zone 1 but not for zone 2 ROP as compared to conventional laser therapy. • Trial was too small to assess safety issue. Mintz-Hittner et al. N Engl J Med 2011; 364:603-15

  32. Avastin in ROP • Caution is warranted for routine use at this time due to safety issues. • 0.625mg in 0.025ml of intravitreal avastin is usually given. • Mostly used as rescue therapy in zone 1 ROP along with laser

  33. Increasing ROP blindness in India High rate of preterm birth Neonatal care not optimal ROP screening and treatment programs not in place Inadequate treatment and follow up Increasing numbers of NICUs and SNCUs

  34. SNCUs Sick Newborn Care Units District level Provide newborn care to decrease mortality Potential sources for ROP in the coming years

  35. ROP Stage 5

  36. 86.4% of infants presenting with stage 5 ROP were never screened • 74.2% were picked up by the parents when they noticed that child is not seeing. • Pediatricians referred none • 25.8% referred by an ophthalmologist. • Sanghi G, Dogra MR, Katoch D, Gupta A. Demographic profile of infants with stage 5 retinopathy of prematurity in North India: implications for screening. Ophthalmic Epidemiol 2011;18(2):72-4. • Prevailing clinical practices among pediatricians Only 14.5% were following the recommendations for ROP referral. • PatwardhanSD, Azad R, Gogia V, Chandra P, Gupta S. Prevailing clinical practices regarding screening for retinopathy of prematurity among pediatricians in India: a pilot survey. Indian J Ophthalmol 2011;59(6):427-30.

  37. Role of neonatologist and / or pediatrician • Prevention of ROP • ROP screening • During ROP treatment / surgery • Follow up of cases

  38. Prevention of ROP • Prevention of prematurity • Good antenatal and obstetrics care 1.Use of antenatal steroids 2.Trained personal in delivery room to avoid asphyxia • Judicious use of oxygen therapy and ventilation • Reduce morbidity of premature infants

  39. ROP screening • Single nodal person to be identified • Communicate with parents and ophthalmologist • Identify babies and decide time for screening • Combine ROP screening visit with follow up for neonatal problems • Record keeping is most important

  40. During laser therapy • Monitoring during therapy • Counseling • Resuscitation

  41. What should be done • Wall chart regarding whom to screen, when to screen and how to dilate should be pasted in NICU and Nursery

  42. What should be done • Any one weighing the new born infant should paste a bold sticker on card / file for ROP screening in babies < 1750gms at birth in 3 to 4 weeks. • Responsibility is of Obstetrician / Pediatrician / nurses to get ROP screening done from Ophthalmologist at appropriate time

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