Incidence of Cataract Extraction After Corneal Transplantation in Young and Middle-Aged Patients Revathi Naadimuthu, MD Gerald W. Zaidman, MD Brandon Mirochnik,

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Incidence of Cataract Extraction After Corneal Transplantation in Young and Middle-Aged Patients Revathi Naadimuthu, MD Gerald W. Zaidman, MD Brandon Mirochnik, BA Tehara Bailey, BA Authors have no financial interest to disclose. New York Medical College Westchester Medical Center Valhalla, NY

Introduction In patients requiring corneal transplantation and cataract extraction there is debate as to how it should be performed: – “Triple procedure” - simultaneous cataract extraction (CE), lens implantation and penetrating keratoplasty (PKP/DSEK) – Keratoplasty followed by CE with lens implantation – Cataract extraction followed by keratoplasty

Purpose Cataract formation has been found to develop in 24–60% of all patients after a single penetrating keratoplasty. This study will: – Determine the incidence of cataract formation in younger and middle-aged patients, aged 25 – 65 years old, who required penetrating keratoplasty. – Determine the various risk factors associated with cataract formation.

Methods A retrospective chart review was performed on 195 penetrating keratoplasty cases performed by a single surgeon between December 1997 and January 2007 in a tertiary care setting, with an average follow up time of 4 years following corneal transplantation. The cases were reviewed for the presence of cataracts following transplant, and the etiologies leading to corneal transplantation. The patients were divided into three groups by age – years old – years old – years old Each group was then analyzed for incidence of cataract formation – Cataract formation did not occur – Cataract formation occurred The factors analyzed were – Preoperative diagnosis – Age – Complications following PKP-rejection, glaucoma, regrafts – Pre-existing lens opacity – Length of time to cataract formation

Results The most common diagnoses included: – Keratoconus (65%) – Fuchs' dystrophy (10%) – HSV keratitis leading to corneal scarring (8%) – Other corneal dystrophies (7%) – Trauma (4%) – Post-refractive surgery ectasia (3%)

Results Age (n=58) KCN48 (83%) Trauma4 (6%) HSV2 (3%) Corneal dystrophy2 (3%) Refractive ectasia1 (2%) Scar, Ulcer1 (2%) Age (n=82) KCN54 (66%) Dystrophy8 (10%) Refractive Ectasia5 (6%) HSV4 (5%) Trauma4 (5%) Ulcer2 (2%) Corneal Edema2 (2%) Fuchs2 (2%) Exposure, scar1 (1%) Age (n=55) KCN21 (38%) Fuchs17 (31%) HSV8 (15%) Dystrophy4 (7%) Corneal Edema1 (2%) Ulcer1 (2%) Diagnosis Leading to PKP by Age

Results Incidence of complications CATARACT FORMATION NO CATARACT FORMATION Rejection37.5%32% AGE  IOP 02% Regrafts02% Rejection42%29% AGE  IOP 6%2% Regrafts12%2% Rejection24%17% AGE  IOP 8%0 Regrafts10%0

Results AGE GROUP PREEXISTING LENS CHANGES CATARACT EXTRACTION (n=58) 2 (3%)1 (1.7%) (n=82) 6 (7%)2 (2.4%) (n=55) 38 (69%)18 (33%) Preexisting lens changes leading to cataract extraction Of all patients, 46% had preexisting cataract, while only 13% went on to require cataract extraction

Results DiagnosisNo. of PatientsRequired CE KCN1326 (5%) Fuchs'199 (47%) HSVK158 (53%) Lattice122 (17%) CATARACT EXTRACTIONS Age Group – 2 cataract extractions – Both in KCN patients – Average of 4 years to CE (n=2) Age Group – 3 cataract extractions – KCN, HSV, Trauma – Average of 1.4 years to CE (n=3) Age Group – 21 cataract extractions – 9 (53%) of all patients with Fuchs' required CE – Patients with Fuchs and prior cataracts had a 64% incidence of CE – 5 (63%) of patients with HSVK required CE – 1 (5%) of patients with KCN required CE – Average 1.98 years to CE (n=21)

Results The major factors affecting cataract formation were the diagnosis leading to corneal transplant and age 47% of patients who formed cataracts had a post-operative complication while complications were only seen in 36% of patients who did not form cataracts, but this difference was not statistically significant Average age was lower in the groups that did not form cataracts vs. those that required CE (37 y.o. vs. 58 y.o.) Total Cataract Extractions = 26 – 81% were over age 51 – 81% had preexisting lens opacities Diagnosis – The most common diagnosis in patients who did not require cataract extraction was KCN – In patients who required cataract extraction, the most common diagnosis was Fuchs' dystrophy followed by HSV keratitis

Conclusion The age of the patient was related to incidence of cataract formation and extraction. KCN was associated with the least incidence of cataract formation, while Fuchs Dystrophy followed by HSV keratitis were associated with the highest incidence of cataract formation and extraction. Any one complication alone (e.g. history of rejection, high IOP, graft failure requiring a 2 nd graft) did not significantly contribute to CE Even when controlled for age, patients with Fuchs had a 53% incidence of CE, compared to 5% incidence of CE in patients with KCN

Conclusion Implications and counseling patients – Risk of requiring cataract extraction is greatest in patients over age 51 33% required cataract extraction In this population the risk is even greater in patients with a diagnosis of Fuchs' dystrophy – Risk is also great in patients with a diagnosis of HSV keratitis – 53% incidence of CE – Complications such as rejection episodes and elevated IOP did not significantly affect the necessity for cataract extraction Surgeons should be aware that many patients aged that require keratoplasty have a chance of needing cataract surgery 1.Martin TP, Reed JW, Legault C, Oberfeld SM, Jacoby BG, Yu DD et al. Cataract formation and cataract extraction after penetrating keratoplasty. Ophthalmology 1994; 101: 113– Rathi VM, Krishnamachary M, Gupta S. Cataract formation after penetrating keratoplasty. J Cataract Refract Surg 1997; 23: 562–564.