|Year : 2018 | Volume
| Issue : 6 | Page : 492-498
Recurrence-free pterygium surgery with special surgical technique
Department of Ophthalmology, Andaman and Nicobar Islands Institution of Medical Science, Port Blair, Andaman and Nicobar, India
|Date of Submission||14-Mar-2018|
|Date of Acceptance||05-Jul-2018|
|Date of Web Publication||15-Nov-2018|
Department of Ophthalmology, Andaman and Nicobar Islands Institution of Medical Science, Port Blair - 744 104, Andaman and Nicobar
Source of Support: None, Conflict of Interest: None
Aim: The aim of this study was to evaluate and analyze the surgical outcome of suture-free, glue-free limbal conjunctival autograft after pterygium excision. Design: This was a prospective, interventional, and hospital-based study. Materials and Methods: Forty eyes of 40 patients with primary pterygium were graded, and excision was performed by the single surgeon. To prevent recurrence-free LCAG was used with special surgical technique “subconjunctival resection of fibrovascular pteygium and cauterization of limbal base to destroy abnormal limbal cells along with resection of 7-mm pteygium.” In this technique, we used patient's own blood as a bioadhesive. The eye was patched for 24 h postoperatively. Patients were treated with topical eye drop prednisolone acetate (1%) 1 drop six times per day with gradual tapering every week, eye drop moxifloxacin (0.5%) 1 drop four times per day, eye drop nepafanac (0.5%) 1 drop four times per day, eye drop carboxymethyl cellulose 1 drop six times per day, and carboxymethyl gel at night for 6 weeks. The outcomes were assessed regarding any recurrence, complication(s), and operative time at each follow-up visit on day 1, day 7, day 30, 3 months, 6 months, and 1 year. Results: There were 30 males (75%) and 10 females (25%). The mean age of all the patients was −51.15 (51.15 ± 10.3 years), range 51–60 years. Cosmetic reason was the chief indication of surgery (11 eyes, 27.5%), followed by recurrent redness (nine eyes, 22.5%). There was no recurrence, and the most common complication was hemorrhagic graft (18 eyes, 45%). All grafts appear indistinguishable by 3 months and were free of symptoms. Average surgical time was 18 ± 2 min. Conclusion: (1) 8-mm LCAG with subconjunctival resection of fibrovascular pteygium and cauterization of limbal base to destroy abnormal limbal cells are very affecting in preventing recurrences. (2) Using patient's own blood as bioadhesive is associated with less postoperative discomfort, less postoperative time, and less complications.
Keywords: Pterygium, pterygium surgery, suture-free glue-free limbal conjunctival autograft
|How to cite this article:|
Das S. Recurrence-free pterygium surgery with special surgical technique. Med J DY Patil Vidyapeeth 2018;11:492-8
| Introduction|| |
Pterygium is a degenerative condition of subconjunctival tissue that proliferates as vascularized granulation tissue to invade the cornea, destroying the superficial layers of stroma, and Bowman's membrane. Pterygium is mostly seen in the nasal side and its prevalence rate varies from 0.3% to 29% in different parts of the world. Higher prevalence of pterygium is noticed with increasing age and the geographical location we belong to., Risk factors for the recurrence are geographic location, age, gender, morphology and grade of pterygium, and the type of surgical technique., Most of the recurrences take place within first 6 months postoperatively, and it has been attributed to the upregulation of the inflammatory process.,
Ultraviolet rays induced elastotic degeneration of subepithelial connective tissue plays role in pathogenesis of pterygium. Reports suggest vascular endothelial growth factor is highly expressed in new vessels in pterygium tissue compared to normal conjunctiva (Marcovich, Morad et al. 2002) and play a role in pterygium (Marcovich, Morad et al. 2002; Aspiotis, Tsanou et al. 2007). Diminution of vision in progressive pterygium is mainly due to flattening of horizontal meridian of cornea, giving rise to “with the rule astigmatism.” As a result of tissue fibrosis, it may lead to alteration of corneal curvature leading to astigmatism and corneal opacity. Cosmetic disfigurement, recurrent inflammation, visual impairment, and difficult to wear contact lens are the main indications of surgery. The results of pterygium surgery are often compromised by postoperative recurrence, which is the leading cause of surgical failure in a significant number of cases. Surgical removal is still the main treatment available for pterygium. The recurrence rate after pterygium surgery may vary according to type of surgery done. Bare sclera technique is associated with recurrence rates around 38.9%. Adjuvant measures such as beta-irradiation, 5-fluorouracil, and Mitomycin-C reduces recurrence rates but associated with complications.
Conventional surgical procedure(s) practiced nowadays to prevent recurrence, alone or in combination, are conjunctival flap, conjunctival rotational autograft, amniotic membrane graft (AMG), or free conjunctival autograft (CAG) or limbal CAG (LCAG) with surgical adjunct (e.g., suture, commercial fibrin glue, and intraoperative or postoperative 0.02% mitomycin C [MMC]), with variable postoperative recurrence and/or success rate (s).
Till recent years, commonly used techniques are CAG, LCAG, and AMG using fibrin glue, sutures, or MMC as adjuvant. However, using these surgical adjuncts have surgical risks and complications too.,, As we all know that cause of pterygium is limbal stem cell deficiency, and it progress as subconjunctival fibrovascular mass; hence, the surgical technique was using limbal CAG of 8 mm to replace the stem cells along with subconjunctival resection of pterygium to prevent slow progress of pterygium even if it start reappearing. Cauterization of limbal base was done to destroy the abnormal limbal stem cells. Following ultraviolet ray exposure there is alteration of limbal stem cells allowing subconjunctival fibrovascular mass to progress and ultimately encroaches up to the cornea. We resects 7 mm along the limbal margin and used 1 mm oversized graft kept in mind the risk for limbal stem cell deficiency at the donor side. Considering the pathophysiology of pterygium, the aim of this study was to prevent recurrence with this special surgical technique.
| Materials and Methods|| |
This prospective study comprised 40 eyes of 40 patients undergoing pterygium surgery at our hospital ANIIMS, Port Blair, Andaman and Nicobar Island. Patients included in the study were from 20 to 60 years of age having primary pterygium involving any eye. Eyes with any pathology which would hamper wound healing such as active infection or inflammation, symblepharon, past ocular surgery within the past 6 months, trauma, and systemic diseases such as diabetes mellitus, collagen vascular disease, pregnancy and bleeding disorders, dry eyes, and allergic eye diseases were excluded from the study. Written informed consent was obtained from each patient. Preoperative assessment included refraction and best-corrected visual acuity (BCVA), slit-lamp biomicroscopy, baseline intraocular pressure (IOP)-measurement using Goldmann applanation tonometer, fundus examination, and photographic documentation of the pterygium. Grading of the pterygium was done as, Grade I-pterygium head up to the limbus, Grade II-head between the limbus and a point midway between limbus and pupillary margin, Grade III-head between a point midway between limbus and pupillary margin, and Grade IV-crossing pupillary margin (Dr. Maheswari Sejal, M. D, senior consultant cornea and refractive surgery, shri Ganapati Netralaya, Jalna, India-classification). All the surgeries were done by single surgeon (Dr Sujit Das) using the same technique. Proparacaine and Betadine eye drops were used for 5 min in each case followed by peribulbar anesthesia. After applying speculum and bridle suture, the first neck of the pterygium was cut and cauterization was done along the limbus up to 7 mm to destroy all abnormal limbal cells. Pterygium was then avulsed using 10-0 needle holder and the corneal surface made smooth using a crescent blade. Subconjunctival fibrovascular pterygium was then separated using a conjunctival scissor and cut up to 4 mm from the limbus kept in mind the insertion of medial rectus muscle. In all case, the author inject normal saline using 26-G needle to separate the free conjunctiva from the underlying tenon's capsule. The author reached half mm inside the limbus using the crescent blade [Figure 1] to take limbal cells as much as possible and an 8-mm graft was cut using a conjunctival scissor from the superotemporal quadrant. The free LCAG was then spread over the bare sclera maintaining limbal-to-limbal orientation. The author wait for 5 min for better adherence of the graft. Thereafter, gently removed the speculum and the eye was patched for 24 h using chloramphenicol eye ointment. Any intraoperative complication as well as the operative time was documented. Average surgical time was 18 ± 2 min, range 18–20 min. Next day, the eye was assessed for symptom, graft adherence, or any complication(s) under slit lamp. Postoperatively, all patients were treated with topical eye drop prednisolone acetate (1%) 1 drop six times per day with gradual tapering over 6 weeks. Eye drop moxifloxacin (0.5%) 1 drop four times per day, eye drop nepafanac (0.5%) 1 drop four times per day, eye drop carboxymethyl cellulose 1 drop six times per day, and carboxymethyl gel at night were given for 4 weeks. All patients were followed up to 1 year (at postoperative day 1, 7, 30, 3 months, 6 months, and 1 year). At each postoperative visit, thorough slit-lamp examination, tonometry, and photo documentation were done, and any recurrence, complication(s), or any complaint were recorded. The primary outcome measure was the recurrence and the secondary measures were complication(s) and surgical time. We defined as follows: (1) “recurrence” as the reappearance of fibrovascular growth at the site of previous pterygium excision extending beyond the limbus onto the clear cornea. (2) “Complication” as any adverse event related to the surgery in the intraoperative and postoperative period, the graft itself, or the drugs prescribed.
| Results|| |
In this study, 40 eyes of 40 patients with primary pterygium underwent excision followed by SFGF LCAG. The mean age of all patients was 51.15 (±10.3 years) [Chart 1]. There were 30 males (75%) and 10 females (25%) with an insignificant difference in mean age (51.07 ± 10.3 years and 51.40 ± 10.3 years, respectively, P = 0.931, t-test), with the highest incidence seen among 51–60 years aged (37.5%) [Table 1]. The most common presentation was cosmetic reason (11 eyes, 27.5%) followed by recurrent inflammation (nine eyes, 22.5%) [Table 2] and [Chart 2]. Grade III pterygium was found to be the most common grade (22 eyes, 55%). Most of the patients were farmers (nine patients, 22.5%) followed by laborers (five patients, 12.5%). Sixteen of them had no visual complaints (16, 40%), 16 had refractive error (16, 40%), and eight had cataract with refractive error (8,20%) [Table 3] and [Chart 3]. On statistical analysis (paired t-test), BCVA showed a P value <0.001 which is statistically significant [Table 4] and [Chart 4]. Mean operative time was 18 ± 2 min. Follow-up was done up to 1 year in 100% of patients. Postoperatively, the most common complication observed was subconjunctival hemorrhagic graft for day-1 (18, 45%) followed by one case each of dellen formation, graft contraction of 0.5 mm, and lost graft [Table 5]. Only one graft had persisting subconjunctival hemorrhage beyond 30 day (1, 2.5%). Resurgery was done in lost graft case after 1 month. In all cases, graft was indistinguishable by day 30 (40, 100%). There was no recurrence up to 1 year of follow-up. IOP was normal in all cases. No limbal stem cell deficiency and subsequent pseudopterygium were noticed in the superior site of the follow-up period.
| Discussion|| |
The modern concern of pterygium surgery is to avoid recurrences and complications while offering rapid recovery safely with minimal discomfort. A recently reported meta-analysis by Kaufman et al., indicated the superiority of CAG and LCAG over AMG, as well as the associated risk of vision-threatening complications with MMC. Other studies, although reported LCAG to have very few recurrence and complication rate, may even result in limbal stem cell deficiency of the donor site. Luanratanakorn et al., in their study, concluded that AMG has a significantly higher recurrence than free CAG. Further, it adds extra cost to surgery, its procurement is cumbersome, and requires surgical expertise. The risk of contamination is another problem as strict sterilization protocol to be maintained during its processing. CAG, AMG, or LCAG requires suture, fibrin glue, or autologous blood as an additional surgical adjunct to secure the graft in place. Suturing is more time-consuming, lead to higher postoperative discomfort, higher recurrence, and complications than others, such as prolonged healing, fibrosis, and granuloma formation. Fibrin glue, although have advantage of avoiding suture-related complication(s), it is not easily available everywhere and it is costly. Further, they carry the risk of transmission of prions and parvovirus B19. Recent reports on SFGF LCAG by different Indian authors such as Kurian et al., Singh et al., Choudhuri et al., and Sharma et al. are very encouraging and comparable with our present study. Whereas, studies conducted in the United Kingdom by de Wit et al. and Shaw et al. amazingly show no complication or recurrence at all. Our study had shown few graft-related complication(s) such as dellen formation [Figure 2], graft loss [Figure 3], subconjunctival hemorrhage [Figure 4], and graft contracture [Figure 5] but no recurrence. We have observed some amount of graft dehiscence from the host conjunctiva (up to 0.5 mm) which is common due to graft shrinkage or ocular movement. This is well-tolerated and does not need to be surgically addressed as long as the graft is secure in its place, and it heals up well. Mitra reported, “The main disadvantage of this surgical technique is the risk of graft loss in the immediate postoperative period, but once the graft stays in place for the first 24–48 h, it is going to stick around. As we all know that cause of pterygium is limbal stem cell deficiency, and it progress as subconjunctival fibrovascular mass; hence, the surgical technique was using LCAG of 8 mm to replace the stem cells along with subconjunctival resection of pterygium to prevent recurrence or slow the progress of pterygium even if it start reappearing. Average operative time in our study was 18 ± 2 min (standard deviation), which compares favorably with other studies as well, and definitely lesser than the suturing technique and possibly the extra time taken to prepare fibrin glue.,, We here emphasized on meticulous pterygium excision subconjunctivally, taking tenon-free slightly oversized graft, and waiting period of at least 3–5 min at the end of surgery for adequate adhesion which gives clue to the overall success as advocated by Mitra and Shaw et al. In this study, the subconjunctival hemorrhages persisted for 30 days followed by appearance of smooth, clear, and shiny graft. Graft became indistinguishable from adjacent conjunctiva by 6 months of follow-up [Figure 6].
| Conclusion|| |
(1) Limbal conjunctival autografting measuring 8 mm with subconjunctival resection of fibrovascular pterygium and cauterization of limbal base to destroy abnormal limbal cells is very effective in preventing recurrence. (2) Using patient's own blood as bio-adhesive is associated with less post operative discomfort, less post operative time and less complications.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]