surgery glaucoma
DESCRIPTION
my seminar on surgical management of glaucomaTRANSCRIPT
SURGICAL MANAGEME
NT OF GLAUCOMA
ABINAYA.K.AROLL NO:1
SURGICAL MANAGEMENT Laser surgeries Trabeculotomy and goniotomy Penetrating filtering surgeries-
trabeculectomy Non penetrating filtering surgeries Cyclo destructive procedures Artificial drainage implants
LASER SURGERIES
Trabeculoplasty
Peripheral iridotomy-Nd:Yag laser
Cyclo ablation-diode laser
LASER filtration procedures
Argon laser
selective laser
TRABECULOPLASTY Laser energy to trabecular meshwork
Cellular changes in angle
Increases the drainage Patient selection: Patients non-compliant with med therapy. Elderly Type of glaucoma-open angle Pigmentation-pseudo exfoliation type;
-pigmentary
PRE-OPERATIVELY: The eye should be free from
inflammation Iop should not be too high It should not be end stage glaucoma
ARGON LASER TRABECULOPLASTY Involves application of laser burns to the
trabeculum at blue-green wavelengths It enhances aqueous flow
Alt is ineffective in pediatric glaucoma and most of sec glaucoma except pigmentary and pseudo exfoliatory types
Application of laser beam:at the junction of pigmented and non pigmented trabeculum.
Ideal reaction:minute gas bubble or blanching
MECHANISM OF ACTION Mechanical effect: Tightening of TM Opening of intervening spaces Opening of collapsed schlemm’s canal
Biological response: Release of cytokines-signals the
macrophages to clear material that has accumulated in meshwork
PROCEDURE Pre-op:brimonidine eye drops 15 mins
before Local anaesthetic Gonioscopic contact lens to visualise the
angle 180 or 360 treated per session Post-op:glaucoma eye drops,anti-
glaucoma medication ot be continued,short course of topical steroids
Follow up-6 wks later
Complications: Peripheral anterior synechiae Small hemorrhages Elevation of IOP uveitis Adverse effect on subsequent filtering
surgery Success rate:POAG-75-80%
SELECTIVE LASER TRABECULOPLASTY Nd:yag laser Laser targets only the pigmented cells
in TM Advantage over ALT-the surgeon can
repeat the surgery over the same angle
PERIPHERAL IRIDOTOMY Definition:
-creating a full thickness hole in the peripheral iris in order to alleviate the pupillary block.
Indications: PACG Fellow eye of a patient with acute
glaucoma Narrow occludable angles Secondary angle closure with pupil block Narrow angle in POAG Combined mech glaucoma
PERIPHERAL IRIDOTOMY
TECHNIQUE OF IRIDOTOMY PUPIL IS MIOSED PRE-OP SITE:PERIPHERY OF IRIS,SUPERIOR IRIS 11-1 o clock position TO PREVENT THE
IRRADIATION OF FOVEA. SUCCESSFUL IRIDOTOMY:GUSH OF PIGMENT
DEBRIS
COMPLICATIONS: Bleeding Iritis Glare and diplopia Corneal burns
SURGERY FOR CONGENITAL GLAUCOMA
1. Goniotomy2. Trabeculotomy3. trabeculectomy
GONIOTOMY Done when cornea is clear or the angle
can be visualised. Mech:Incision of obstructing trabecular
meshwork
Direct conduit between AC & schlemm canal
Barkan goniotomy knife
Pre-op care: Acetazolamide:one week before to clear
corneal opacity ARI & NLD obstruction – treated Complications: Post-op hyphema Injury to iris & lens DM detachment
TRABECULOTOMY
Harm’s trabeculotome
FILTERING PROCEDURETRABECULECTOMY
Patient selection:
Pre-op considerations: Any type of glaucoma Intact,non-scarred conjunctivaSurgical technique: Incision through the conjunctica Partial thickness scleral flap A small hole in AC Iridectomy at this point Scleral flap closed with stitches Conjunctival tissue closed with stitches
to allow formation of bleb
TRABECULECTOMY
I.LIMBAL BASED CONJUNCTIVAL FLAP
II.OUTLINE OF SUPERFICIAL SCLERAL FLAP
III.DISSECTION OF SUP.SCLERAL FLAP
IV.INCISION FOR DEEP SCLERECTOMY
V.EXCISION OF DEEP SCLERAL BLOCK
VI.PERIPHERAL IRIDECTOMY
Bleb is situated in superior aspect of eye covered by the upper eyelid
Anti-metabolites: 5 FU and mitomycin(0.02%) used. It prevents scarring of tissue Frequent use will lead to hypotony Anaesthesia:~retro bulbar / topicalo Post-op :o Success rate:65-70%
THIN, POLYCYSTIC BLEB
SHALLOW, DIFFUSE FILTERING BLEB
VASCULARISED, NON-PENTRATING BLEB
LEAKING BLEB
POST-OP COMPLICATIONS Shallow anterior chamber Pupillary block Over filtration Malignant glaucoma Failure of filtration Bleb related complications Bleb leakage Blebitis Bacterial infection
NON-PENETRATING FILTERING SURGERIES Intro: AC is not entered , so post-op hypotony
does not occur. Dis adv: Two types: Deep sclerectomy Visco-canalostomy
ARTIFICIAL DRAINAGE DEVICES Intro: Plastic devices which create a
communication between AC and sub tenon space.
Indications: Uncontrolled glaucoma Sec. glaucoma-neo vascular
glaucoma,aniridia Severe conjunctival scarring
IMPLANT TYPES With a valve:~ahmed and krupin Without a valve:~molteno and baerveldtSETON’S OPERATION
Complications: Excessive drainage Corneal decompensation Cataract Diplopia Late endophthalmitis
Success rate:75%
CYCLO DESTRUCTIVE PROCEDURES Surgical and laser procedures that
ablate the ciliary body to lower the iop surgery:-cyclo cryotherapy Laser-cyclophotocoagulation Feared complication:hypotony
Thank
you!