Hydrodissection of conjunctival flap during trabeculectomy in eyes with conjunctival scarring caused by trachoma.

摘要

BACKGROUND AND OBJECTIVE: Conjunctival scarring caused by trachoma represents a substantial challenge even to the most experienced cataract/glaucoma surgeon. We describe a simple technique of hydrodissection of conjunctival flap during combined trabeculectomy and phacoemulsification in eyes with conjunctival scarring caused by trachoma, and discuss its impact on surgical outcome. PATIENTS AND METHODS: A prospective study was conducted in 10 Omani patients, aged 48 to 83 who underwent combined trabeculectomy and phacoemulsification with intraocular lens (IOL) implantation. The conjunctival flap was prepared after hydrodissection using a mixture of 1 mL of balanced salt solution (BSS) and 1 mL of lignocaine 2% with 1:200,000 adrenaline. Outcome measures that were evaluated were visual function, intraocular pressure (IOP) and bleb characteristics. Patients were followed-up postoperatively for a minimum period of 6 months. RESULTS: The mean age of patients was 60.4 years (48-83) and a functioning bleb after 6 months was seen in 8 (80%) cases. IOP < 20 mm of Hg (applanation tonometry) without antiglaucoma medications was found in 8 cases; 1 case required one antiglaucoma medication and 1 case required more than one antiglaucoma medication for control of IOP. The latter was reoperated for control of IOP. Nonprogression of visual field was found in 8 (80%) cases. CONCLUSION: Preparation of conjunctival flap by hydrodissection was found to be a simple modification of the conventional technique during combined trabeculectomy and phacoemulsification in trachomatous eyes. It reduced conjunctival dissection, use of cautery and possibility of button-holing of the conjunctiva during dissection in scarred eyes. The minimal tissue dissection involved in this procedure reduced wound healing and thereby increased chances of a functioning bleb, control of IOP and nonprogression of visual field compared to combined surgery employing a conventional method (nonhydrodissection method) of conjunctival flap dissection.